Browse Topic: Protective systems

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Vehicle-Integrated Camera Based Rider Helmet Detection & Warning System2024-26-000901/16/2024
Non-usage of helmets does not cause accidents but are critical for averting fatal and grievous injuries in the event of road occurrence accidents. A report by Transport Ministry says, during 2021, a total of 46,593 persons were killed due to non-wearing of helmet, of which 32,877(70.6%) persons were drivers and 13,716 (29.4%) were passengers. Currently, traffic police use the helmet detection solution on surveillance videos to identify the vehicle number plate who’s not wearing helmets to issue challans. But on the vehicle side it is not yet implemented. At present, vehicles are neither equipped to issue warnings nor there are any safety measures taken to minimize the risk, when rider is not wearing the helmet. This paper suggests a passive safety system for two wheelers that uses an integrated camera to detect if rider is wearing a helmet or not by utilizing image processing techniques. Based on the result, if helmet is not detected, then the vehicle will issue warnings and limit
Kishor, Kaushal, Tarte, Malay, Joshi, Umita
The Impact of Uncertainty Quantification and Sensitivity Analysis in CAE Simulation based Regulatory Compliance2024-26-029401/16/2024
Computer aided engineering (CAE) is a routinely used technology for the design and testing of road vehicles, including the simulation of their response to an impact. To increase automotive industry competitiveness by reducing physical test based type approval and to improve road safety, recent initiatives have been taken by both industry and public authorities to promote the use of virtual testing through numerical simulation as an alternative way to check regulatory compliance. [1] To ensure acceptance of this alternative method, accuracy of the simulation models and procedures needs to be assured and rated independently of the modelling process, software tools, and computing platform. Similarly, it is also imperative to understand the uncertainties emerging out of different component design parameters and analyze their sensitivity towards producing deviations in the reported results as per the requirements of the regulatory standard. Simulations are however deterministic in nature
Deshpande, Saurabh, Mahajan, Rahul, Jones, Gavin
Effectiveness of the Load Legs in Enhancing the Passive Safety of Rear-Facing Child Seats in Frontal Crash2024-26-034301/16/2024
The passive safety performance of a child seat is modulated by the design features of the child seat and the vehicle interior. For example, in the rear-facing configuration, the child seat impacting front structures increases the head injury risk during a frontal crash. Therefore, this study evaluates the effectiveness of the load leg countermeasure in improving the child seat's overall kinematics and its capability to prevent the secondary impact on the vehicle interior structure in a severe frontal crash scenario. An in-depth, real-world crash investigation involving a properly installed rear-facing child seat impacting the center console is selected for the study where the infant sustained a severe brain injury. In addition, this crash is employed to choose the crash parameters for evaluating the effectiveness of the load leg countermeasure in a similar scenario. Finally, crash sled tests are conducted using the crash signature of the vehicle as obtained from the NHTSA NCAP rigid
Thorbole, Chandrashekhar
INTEGRATION OF SEAT-BELT WEB-GUIDE FUNCTIONALITY IN TRIM PART2024-26-001801/16/2024
Restraint systems in automotives are inevitable for the safety of passengers. Seat belts are one such restraint system in automotives that prevent drivers and passengers from being injured during a crash by restraining them back. Seatbelt on automotives has interface with Body-in-white (henceforth called as BIW) and Trim parts in-order to serve its purpose at vehicle level. One such interface part of seat belt is the web guide, which assists and ensures the nylon web’s smooth motion at different seat track positions. Web-guides on automotives ensure the flawless motion of seat belt web at pillar trim areas. In this paper, we are discussing about alternate ways of assisting the seat belt web without the web-guide as a separate part In-order to assist and ensure the motion of nylon web in its trajectory, we have extended the flange of the pillar trim involved. The paper throws light on the advantages of using an extended trim flange as web-guide for seat belt web instead of a separate
D, GOWTHAM, bornare, harshad, GANGAPURAM, SURESH, Deoli, Manish, RITESH, KAKADE, sai, Konduru, Kakani, Phani Kumar
Novel Method for Vehicle Crash Pulse prediction2024-26-000201/16/2024
Airbags are crucial elements of passive safety in vehicles that help minimizing occupant injuries during various crash scenarios such as frontal, side, and oblique impacts. Airbags in cars are now mandatory in many countries, and their performance depends on how well the system is designed. A well-tuned airbag deployment algorithm is necessary to score superior NCAP safety ratings. Tuning of airbag deployment algorithms requires several data points which are obtained through actual crash testing. This is a cumbersome and expensive process as it involves crash tests for each scenario (e.g., full front barrier, offset deformable barrier, angled impact, etc.) at multiple test speeds. These tests are destructive and render the vehicles only worthy of scrap. The data gathered from various sensors (acceleration, pressure, etc.) is used to develop robust vehicle model specific algorithms that must correctly identify the crash scenario and send airbag firing signal at the optimal pre-decided
Kumar, Ayush
Auto lock of manual seat track adjustment in passenger vehicles2024-26-000101/16/2024
Vehicle seats are provided with a facility to adjust the seat forward or rearward. Seating positions can be adjusted according to the comfort of the occupants. Seat track position plays an important role in airbag deployment during vehicle crash. A hand lever is used to manually adjust the seat track in some vehicles by pulling up the lever and releasing it after the appropriate seating position has been adjusted. All the safety manuals provided by OEMs warns about the adjustment of seat track position as forward or rearward during vehicle movement. It is high risk because of any rapid movements due to unexpected road conditions might result in driver losing control of the pedals and steering wheel and this may leads to severe injuries and even can cause fatalities. The proposed system in this paper is focused to provide more safety to the driver with a new method " Auto lock of manual seat track adjustment in passenger vehicles”. The proposed system shall be integrated with Body
Nalagatla, Karthik, S, Deepak Kumar, Jamadar, Tohidanjum
RAMP BRACKET ANGLE OPTIMIZATION COUPLED WITH IMPROVED HEAD ROOM2024-26-001601/16/2024
Restraint systems in automotives are inevitable for the safety of passengers. Curtain airbag is one such restraint system in automotives that reduces the risk of injury to passengers during crash, without which head injury is inevitable during side crash of a vehicle. So successful deployment of Curtain airbag (henceforth called as CAB) is very important in automotive safety during crash. This paper dwells about the optimization done in ramp bracket angle with successful deployment of Curtain airbag. This optimization has paved the way for increasing the head-roominess by ~15% and to respect the safety and styling intent in the vehicle successfully. Providing a ramp bracket at the lower bottom side of CAB guides the airbag successfully during deployment. Ramp bracket angle plays a vital role in guiding the airbag inside the passenger’s cabin without any obstruction. This paper challenges the conventional ramp bracket angle followed for CAB deployment with an alternate angle and has
D, GOWTHAM, L, DHARSHAN, bornare, harshad, RITESH, KAKADE, Deoli, Manish, BHASKARARAO, PATHIVADA, GANGAPURAM, SURESH, Kakani, Phani Kumar
Importance of Pole Side Impact Test for Assessment of Curtain Airbags2024-26-001901/16/2024
Government of India, in 2017, mandated a Side Impact Test (AIS 099 technically aligned to UN ECE Regulation No. 95.03 series of amendments) on M1 category Passenger Vehicles to ensure protection of occupants in lateral impact accident scenarios. Later, in 2022, a draft notification has been issued by the Government mandating installation of 6 airbags (2 No.of thorax side airbags, 2 No. of head protection or curtain airbags in addition to already mandated installation of Driver and Passenger Airbags) in all such passenger vehicles. However, the vehicles fitted with side thorax airbag and curtain airbags are proposed to be assessed as per AIS099 test only. Curtain Airbags are typically installed to protect occupant’s head from severe injuries in narrow object impacts simulated in Pole Side Impact Test Configurations. However, at present, India has not notified an equivalent standard to UN R135 demanding performance of the vehicle in pole side impact scenarios. Typically, OEMs may need to
Jaju, Divyan, Kulkarni, Dileep, Mahindrakar, Rahul, Mahajan, Rahul
PERFORMANCE OF FIVE-POINT SEAT BELT ON OCCUPANT SAFETY IN VEHICLE ON FRONTAL CRASH TEST2022-28-049311/18/2022
In day-to-day life, accidents do occur frequently all-round the globe. It is difficult to prevent these accidents as they occur due to different reasons, which cannot be easily controlled. But the fatal injuries occurring to passengers can be reduced by installing safety systems in vehicles, which will help in saving the life of mankind. There are many safety systems being installed in vehicles such as seat belt restraints, air bags etc. Generally, three-point seat belts are installed in passenger vehicles for safety purposes. This type of seat belt doesn't arrest the entire motion of the occupant body during vehicle crashes, which can lead to fatal injuries and sometimes even death during vehicle crashes. In order to buckle passengers with seats, we can use five-point seat belts which will help in mitigating the injuries as compared to three-point seat belts. In this paper, we evaluate the performance of five-point seat belts on occupant safety during vehicle crash on flat rigid
Jeyakumar, P, CHANDRAN, DINESHKUMAR
Soft Mate Lifting DeviceTBMG-4691411/01/2022
Injury Severity Prediction Algorithm of SUBARU Fleet Model for Advanced Automatic Collison Notification2022-01-100503/29/2022
Recently, with the evolution of telemetry technology in vehicles, Advanced Automatic Collision Notification (AACN) that detects patients at risk of serious injury in the event of an accident and transports them to the trauma center at an early stage may greatly improve the treatment of patients. An Injury Severity Prediction (ISP) algorithm for AACN was developed using a logistic regression model to predict the probability of sustaining Injury Severity Score (ISS) 15+ injury. National Automotive Sampling System Crashworthiness Data System (NASS-CDS: 1999-2015) and model year 2000 or later were filtered for new case selection criteria, which were based on vehicle body type, to match Subaru’s fleet. This proposed algorithm uses crash direction, change in velocity, multiple impacts, seat belt use, vehicle type, presence of any older occupant, presence of any female occupant, and presence of the right-sided passenger. Variable selection techniques were used to construct the final ISP
Ejima, Susumu, Goto, Tsukasa, Zhang, Peng, Cunningham, Kristen, Wang, Stewart
A Study of High Refinement Simulation Prediction on the CAB Development for FMVSS226 Ejection Mitigation Performance2022-01-092203/29/2022
In the side impact crash accident, the curtain airbag (CAB) plays a significant role in the occupant head protection. With the increasing of the rollover accidents, the CAB development is requested to be able to protect the occupant head throughout the whole rollover accident, and to ensure that the occupant head is not partially or totally ejected from the vehicle. NHTSA released the FMVSS226 Standard in 2011, defined the requirements for ejection mitigation systems, which limits the linear travel of headform by 100mm. In China regulations, there are similar requirements starting in 2021. The difference is that it can be replaced by meeting the pressure holding requirements of 6s (up to 50% of the average pressure of 40-70ms). Therefore, on the basis of the existing airbag design, adding the rollover protection function becomes a new challenge for the airbag development. During the development of the curtain airbag, the cushion design, inflator type, and the fold pattern, all have an
Shan, Jinhui, Xue, Lele, Wang, Cheng
Assessment of fetus injury risk during vehicle frontal impact for different lap belt positions2022-01-102203/29/2022
The paper addresses vehicle safety for pregnant drivers and passengers. The influence of the different positions of the lap part of the seat belt for pregnant female drivers and passengers on the injury risk is assessed. The finite element based pregnant abdomen model is incorporated into the simplified validated rigid body based female body model. The pregnant female model is positioned into a frontal seat and restrained by a safety system such as three-point seat belt and an airbag to simulate the sled test scenario. The deceleration pulse corresponding to a frontal impact related to two impact velocities is applied and the restraint system performance is assessed with focus on the fetus and female injury risk. The uterus is modelled via so called biobag and mechanical loading and injury risk of this particular part and adjacent structures are the main concern of this study.
Spicka, Jan, Hyncik, Ludek, Jansova, Magdalena, Talimian, Abbas
A Comparison of THOR 50M Anthropomorphic Test Devices in Frontal Sled Tests when equipped with and without On-Board Data Acquisition Systems. 2022-01-104803/29/2022
This paper summarizes a series of matched-pair frontal sled tests using the THOR 50th Percentile Male anthropomorphic test device (ATD). Testing was conducted to compare the response of an ATD equipped with an on-board data acquisition system (DAS) to that of one equipped with an off-board system. Sled testing was performed using a modified version of NHTSA’s Gold-Standard test method consisting of a generic buck with a ridged seat and a 3-point seatbelt system. Eight tests were conducted, all using a common generic 30 km/h crash pulse with a peak deceleration of 9 G’s, and a 2.5 kN load limiting 3-point seatbelt retractors without pretensioners. Four tests were conducted with each ATD, two tests with a left shoulder belt routing and two with a right shoulder belt routing to allow for evaluation of the ATD repeatability under each belt routing. Attention was given to the potential for a heating effect of the on-board DAS to influence the dummy response; particularly the chest
Ward, Josh, Dellicolli, Anthony, Dix, Jeff
Seat Belt Restraint Evidence Generated by Unrestrained Occupant Interaction in a Rollover 2022-01-102803/29/2022
Assessment of the physical evidence on a seat belt restraint system provides one source of data for determining an occupant’s seat belt use or non-use during a motor vehicle crash. The evidence typically associated with restrained occupant loading has been extensively researched and documented in the literature. However, evidence of loading to the restraint system can also be generated by other means, including the interaction of an unrestrained occupant with a stowed restraint system. The current study evaluates physical evidence generated on stowed restraint systems generated via interaction with multiple unrestrained occupants during a full-scale dolly rollover crash testing of a large multiple passenger van. Unbelted anthropomorphic test devices (ATDs) were positioned in the driver, right front passenger, and all designated seating positions in the third, fourth, and fifth rows. Occupant kinematics during the dolly rollover were evaluated through on-board and off-board real-time
Miller, Bruce, Dibb, Alan, Allin, Leigh, Carhart, Michael, krishnaswami, ram
Development of Biomechanical Computational Models of Six-year-old Child Occupant with Different Sitting Postures and Application in the Study of Whiplash Injuries2022-01-105203/29/2022
Whiplash injury is one of the main types of child occupant neck injuries in traffic accident. With the development of intelligent cockpit, child occupants will engage in traffic operation in various sitting positions. Therefore, studying the mechanism and risk of whiplash injury of child occupants with different sitting postures has important application value for the research and development of child restraint system. In this study, the 120° and 135° sitting postures of six-year-old child occupant were developed based on the validated 105° sitting posture finite element model with detailed anatomical structure. The whiplash test in Euro NCAP was reconstructed to evaluate the influence of sitting position angle on the risk of whiplash injury. In the three groups of simulation experiments, the Upper Neck Tension (Fz) was far less than the higher limit of Euro NCAP evaluation although the Fz value increased as the upper torso angle increases. However, the Upper Neck Shear (Fx) and Neck
Li, Haiyan, Wang, Yanxin, He, Lijuan, Lv, Wenle, Cui, Shihai, Ruan, Jesse Shijie
Occupant Age and Health Diagnosis for Integrated Safety Solutions2022-01-102003/29/2022
Autonomous Driving is the next big thing in the Automotive Future. With growing automation, there is also growing need for In-cabin and Occupant monitoring. Impaired Driving as a cause constitute a statistically major portion of the total accidents in the world. Additionally, the aging society of road users add to health concerns of possible drivers behind the wheel which might lead to severe accidents. Since the accident and the associated damage would have been occurred due to incapacitated drivers in the first place, there arises a need to know the state of drivers while driving to ensure the safety of him and other road users. Therefore, the monitoring of the driver's state and detection of any deviation from the suitable driving condition is significant to reduce the number of accidents on the road. One of the efficient ways to know the drivers’ state is to monitor the health – physical, mental and emotional, of the drivers essentially. Understanding the impact of age and health
Damodharan, Suchitra, Muralidharan, Vishal, Muralidharan, Vivek, Srinivasa, Praveen, R N, Sreelakshmi
Car-based external airbag for bicyclist protection in side impacts2022-01-103203/29/2022
Cyclist injuries and fatalities are a world-wide concern and often a consequence of interaction with cars. The MICA2 Project (Modelling of Interactions between Cyclists and Automobiles) is aimed at protecting bicyclists from getting hit by a passing car. This study addresses the need for new passive safety systems through the development and testing of a novel external car airbag. The airbag was designed to add protection to the center side part of the car, in the B-pillar area, to protect the head of a bicyclist impacting a car in this area. Two methods were used to evaluate performance of the system. For full system tests, a Hybrid III 50th percentile male dummy was seated on a city bike and projected into the side of a car at either 30º, 60º or 90º to the car side. In addition, component tests an adult pedestrian headform was launched towards the roof rail or B-pillar structure of the car. We found the highest injury risk in a perpendicular (90 degree) impact between the bicycle and
Carroll, Jolyon, Enanger, Mikael, Jeppsson, Hanna, Lubbe, Nils
Finite Element Modeling of Passenger-side small overlap crash test with a view to correlate the right foot kinematics and injury of the Hybrid-III dummy.2022-01-104303/29/2022
In 2018, IIHS has added passenger-side(P-S) small overlap (SOI) test to the Top Safety Pick Plus(TSP+) ratings requirement, in addition to the existing driver-side (D-S) SOI test. Both the test protocols mandate the reduction of lower extremity injuries in addition to all the other overall injuries for Hybrid-III dummy. The safety of the passenger’s outboard right foot in a P-S SOI test is of more concern compared to the driver’s outboard left foot in the D-S SOI test. This is because, while the driver’s left foot rests on the foot rest, which is stiff and has sufficient offset from the toe pan to absorb the energy coming from the impact of the SOI barrier, the passenger’s right foot is positioned just above the carpet on the toe pan, and is closer to the barrier during an impact event. So it requires some countermeasures to reduce the lower extremity injuries of a passenger in P-S SOI tests. This paper describes a time efficient method to model the P-S SOI test using finite element
Parab, Milind, Stahmer, Eric, Mohammed, Ansar
Recycled Personal Protective Equipment (PPE) in Automotive Components: A World-First to Reduce Single-Use Medical Plastic Waste2022-01-090703/29/2022
The Covid-19 pandemic has significantly increased the amount of single-use plastic, especially as personal protective equipment (PPE) like gloves, disinfecting wipes, and medical-grade facemasks have become common among the general public. The need for public health, however, has ushered in a pandemic of another kind: one of environmental harm. Although efforts have been made to prolong use or otherwise reduce waste of these items, many areas have already seen negative effects of both properly discarded and littered PPE. It is estimated 89 million masks are used globally per month, and in the U.S. alone, the healthcare system generates 5 million tons of medical waste annually, not including drastic scale-up during the pandemic. Other countries have up to eighteen times that amount, far exceeding capacity at disposal facilities. To reduce the environmental threat from these items, which have become necessary to maintain public health, the Hyundai-Kia Materials Development Department
Nummy, Amanda
Effects of Adjacent Vehicle Seat Positions on Child Restraint System (CRS) Performance in Side Impacts2022-01-102303/29/2022
Many modern vehicles allow consumers to adapt the vehicle environment to their families’ needs by folding or removing one or more rear row seats. It is currently unclear how different seat configurations affect child restraint systems (CRS) installed in adjacent seats. The objective is to quantify CRS performance in far side impacts when the seating position adjacent to the CRS is in its normal upright position, folded in half, or removed. Twelve tests were conducted. Second row seats from a recent model year minivan were obtained, including full size captain’s chairs from the outboard position and narrow, removable seats from the center position. Rear-facing (RF) and forward-facing (FF) CRS were installed one at a time in either the outboard or center position. The Q3s ATD was used for all tests. The seating position adjacent to the CRS was set in either the standard upright position, folded in half, or removed. Far-side impacts were conducted at 10° anterior of pure lateral at 25 g
Mansfield, Julie, Kang, Yun Seok
Crash test and Design enhancement for safer BAJA SAE ROLLCAGE2022-01-104403/29/2022
BAJA SAE ATV consist of single driver Monocoque roll cage usually with rear- engine, which supposed to bear all the off-road dynamic load & protect the driver under all the catastrophic crashes designed considering various safety rules instructed by SAE which would be checked in technical inspection before completions, Research involves a physical Crash test study of BAJA SAE roll cage and then compare its result with performed dynamic explicit analysis using Radioss as solver on finite element model of same roll cage, set up a relation between virtual and real crash; further enhancing the roll cage design using the crash result to make the driver safer. As per the result a great displacement similarity has seen observed in physical and virtual crash environment, various design changes, and extra members have been added to the roll cage to protect the driver from engine intrusion from the back. The physical crash was automated using few sensors and frugal innovation or jugaad
Bhardwaj, Vasu
Reconstruction of an auto-rickshaw frontal crash using FE simulation with validation using captured crash video from India2021-28-025710/01/2021
The three wheeled “Auto-Rickshaws” [Auto] plays a significant role in road transportation, especially in India. The crash safety and reconstruction studies have been widely used in four wheelers, whereas the availability of such data for Auto was found to be limited. In recent times, accident data processing from available videos is being utilised to observe the crash scenario, from which the crash parameters can be given as inputs to the crash analysis. This paper focusses on process the real-world accident data and study crash characteristics. With limitation in availability of detailed injuries post-crash, the study was restricted to reconstruction of crash kinematics and estimations of indicative injuries to driver. The source of video data is videos of crash available in public domains like YouTube. PYTHON video processing tool has been used to process the set of real-world accident video data. The object detection, Pixel per meter computation and object tracking are the major
S, Ragul, Sankarasubramanian, Hariharan, Kondaveeti, N S V Nikas, Yadav, Pandugayala Nithin
Automatic Alert System to enable safe ride and to prevent accidents in Two Wheelers and Three Wheelers2021-28-023310/01/2021
In Midway, accidents are general in nature on the highways. Vehicles meeting the accidents are not saved in a faster way for the rescue. This system operates the signal from the seat belt sensor, during the operation of the vehicle. An Electronic Control Unit (ECU) has been deployed to provide the information about the passenger mobile phone contacts and the nearest safety officer with respect to the Global Positioning System installed in the vehicle. The signal from the seat belt fastening system for the driver and the front seat passenger is indicating the dearer contacts and the health of the centers for the rapid recovery of the vehicle met with an accident. This ECU also monitors the health condition of the passengers for the safety ride with respect to the pressure and the temperature of the cabin to make the passenger a safe ride. 20 sensors are deployed in the seat belt and the signals from these sensors are fed into an electronic control unit for further processing. The
B, Prabakaran, Chinni, Venkata Sai Sandeep, Chitta, Phani Kumar
Webbing Service Life for Occupant RestraintsARP6073 (Current)10/01/2021
This document applies to webbing used on occupant restraint systems in service on 14 CFR/CS part 23, part 25, part 27, and part 29 aircraft applications. The guidelines presented within this document are intended to be supplemental to the requirements supplied by the OEM in the CMM, ICA, or like document. In cases of conflict between this ARP and the OEM’s requirements, the requirements of the OEM shall be followed. The objective of this document is to establish practical guidelines to help operators in the determining if restraint webbing has reached the end of its service life. The recommendations contained herein are based on test data from in service restraint systems and the continued airworthiness guidelines recommended by restraint system OEMs.
Aircraft SEAT Committee
Inspection and Test Quality Systems, Requirements for Aviation, Space, and Defense OrganizationsAS9003B09/30/2021
Price increases in effect for this document as of January 2017 reflect a new copyright agreement for use of ISO 9001:2009. This standard includes selected quality system requirements from ISO 9001:2008[1] and AS9100:2009 applicable to noncomplex products and associated manufacturing processes. ISO 9001 text incorporated into this standard appears in standard font; while aviation, space, and defense industry additional requirements, definitions, and notes are presented in bold, italic text. The requirements of this standard are intended to be applied in whole, without any exclusions. Compliance with all corresponding AS9100 requirements is considered to meet/exceed compliance with the requirements of this standard. The requirements specified in this standard are complementary (not alternative) to contractual and applicable statutory and regulatory requirements. Should there be a conflict between the requirements of this standard and applicable statutory or regulatory requirements, the
G-14 Americas Aerospace Quality Standards Committee (AAQSC)
INTEGRATED ACTIVE SAFETY SYSTEM FOR MOTOR GRADERS2021-26-013709/22/2021
Safety of the operators in any equipment can be achieved by both passive and active systems. Passive safety system includes Seat belt, primary air bag, bumper, and other structural components which protects the operator from injuries during accidents. On the other side, Active safety systems like Braking, Steering, Collision avoidance system, operator fatigue monitoring systems minimise and eliminates the accidents among which the Brake system is primarily used to control and stop the equipment. Motor graders are work equipment which are designed to carry out many works like grading, spreading, levelling, metal mixing in road construction and many other infrastructure projects. Considering the field operating conditions of motor grader, it is very essential to provide excellent brake system to control and stop the equipment. In order to obtain maximum productivity the equipment speed is kept substantially high. Brake systems are operated using Air, Hydraulics, etc., among which the Air
KUMARAN, RAJASEKAR, hs, satish chandra
Design Development and Testing of Light-weight FUPD using Composites Material2021-26-024509/22/2021
With the increasing need for developing fuel-efficient and high-performance vehicles, Light weighting has become a very important aspect in automotive industry. Hence conversion of the existing metal components to composites is gaining momentum. Composite materials are much lighter than metals and offer many advantages such as fuel efficiency, corrosion resistance and improved life which has resulted in the increased usage of composite materials. Front Under-run Protection Device (FUPD) is a protective device which is fitted on the front side of a truck which prevents the vehicle in front from under-running below the truck and also absorbs impact energy in case of a collision. This paper discusses the design, development and Certification from ARAI of the lightweight composite Front Under-run Protection Device (FUPD). It has resulted in 33.33% weight reduction compared to the earlier metal component. The light-weight composite FUPD withstands loads of 80 kN and 160 kN as per the
Srivastava, Sanjay, Dravid, Nikhil
Occupant Pseudo Buckling Detection Method In Passenger Vehicles2021-26-002009/22/2021
Seatbelts are solely designed for protecting the occupants from gruesome accidents, seatbelts along with Airbags play a vital role in protecting the lives of occupants during a crash scenario. Seat Belt Reminder (SBR) is an audio-visual indicator on the car dashboard which alerts the occupant to buckle the seatbelt. According to Ministry of Road Transport and Highways, Government of India[1], the number of deaths associated with occupants not wearing seat belts was 24,435 and accounted for 16.1 per cent of total road accident deaths in the country, involving 9,349 drivers and 15,086 passengers. This research is primarily relied on buckle status and thus were unable to detect if the occupant had pseudo buckled i.e., wrapping the seatbelt across the seat rather than over the occupant to avoid SBR. This paper proposes a new method which discourages the occupant from pseudo buckling. It consists of a magnet and a reed switch system, where the magnet is embedded in the seatbelt and the reed
Nalagatla, Karthik, Jayaram, Vikas, Patel, Abhilash
Innovative method of Child injury performance Optimization using Sled tests2021-26-000809/22/2021
¬¬¬Child injury performance evaluation is becoming critical part of almost all legal and consumer based vehicle safety evaluation protocols. Most of New CAR Assessment Protocols (NCAP) now have separate ratings exclusively to evaluate Child restraint system effectiveness and Child dummy performance under various crash testing modes. OEM’s have need and challenge of maximizing injury performance. Sled tests are conventionally used for tuning restraints like seat belts and airbags for driver and co driver under various frontal type test conditions. However second row seats are used for CRS/ Child injury performance evaluations. In the present study an attempt is made to simulate child injury performance of P3 dummy positioned on second row seat on defined child seat for 64 kmph frontal Offset deformed barrier type test confirming to Global NCAP. Sled pulses are carefully tuned to capture key injury patterns. Thence restraint parameters are tuned to improve child dummy injuries
Shanbhag, Ganesh
Suspension Components Calculation at Concept Stage to Evaluate the Ride and Handling Characteristics2021-26-008209/22/2021
Vehicle handing and ride are the critical attributes for customers while buying new passenger vehicle. Hence it is very important to design suspension which meets customer expectations. Often tuning of suspension parameters is very difficult at later stage like wheelbase, vehicle center of Gravity and other suspension parameters like roll center heights etc. A parametric mathematical model is built to study the effect of these parameters of vehicle handling and ride attributes at concept stage. These models are used to calculate the suspension ride rates, spring rates and Anti roll bar diameters for meeting target vehicle ride and handling performance. The model also calculates natural frequency of suspension and vehicle for understanding pitch and roll behaviours. The inhouse tool developed is used for calculating suspension damper characteristics and predicts ride attributes like Bounce damping, bounce stiffness, Isolation level, Flat ride and Impact Hardness categorized based on
Saifee, Aliakbar, Deshmukh, Chandrakant, deole, Subodh
Performance Standard for Passenger Smoke and Toxic Fumes Respiratory Protective EquipmentAS8048A (Current)09/20/2021
This SAE Aerospace Standard (AS) defines the performance requirements for equipment to be used by untrained cabin occupants for protection from toxic and irritant atmospheres while on board and during evacuation of an aircraft.
A-10 Aircraft Oxygen Equipment Committee
Performance Standard for Passenger Smoke and Toxic Fumes Respiratory Protective EquipmentAS8048A-TEST-REC (Historical)09/20/2021
This SAE Aerospace Standard (AS) defines the performance requirements for equipment to be used by untrained cabin occupants for protection from toxic and irritant atmospheres while on board and during evacuation of an aircraft.
A-10 Aircraft Oxygen Equipment Committee
Standard Practice for HabitabilitySAE1007 (Historical)09/14/2021
This Standard specifies the Habitability processes throughout planning, design, development, test, production, use and disposal of a system. Depending on contract phase and/or complexity of the program, tailoring of this standard may be applied. The primary goals of a contractor Habitability program include: Ensuring that the system design complies with the customer Habitability requirements and that discrepancies are reported to management and the customer. Identifying, coordinating, tracking, prioritizing, and resolving Habitability risks and issues and ensuring that they are: ○ Reflected in the contractor proposal, budgets, and plans ○ Raised at design, management, and program reviews ○ Debated in Working Group meetings ○ Coordinated with Training, Logistics, and the other HSI disciplines ○ Included appropriately in documentation and deliverable data items Ensuring that Habitability requirements are applied to all personnel environments, including operators, maintainers, trainers
G-45 Human Systems Integration
Standard Practice for HabitabilitySAE1007-TEST-REC (Historical)09/14/2021
This Standard specifies the Habitability processes throughout planning, design, development, test, production, use and disposal of a system. Depending on contract phase and/or complexity of the program, tailoring of this standard may be applied. The primary goals of a contractor Habitability program include: Ensuring that the system design complies with the customer Habitability requirements and that discrepancies are reported to management and the customer. Identifying, coordinating, tracking, prioritizing, and resolving Habitability risks and issues and ensuring that they are: ○ Reflected in the contractor proposal, budgets, and plans ○ Raised at design, management, and program reviews ○ Debated in Working Group meetings ○ Coordinated with Training, Logistics, and the other HSI disciplines ○ Included appropriately in documentation and deliverable data items Ensuring that Habitability requirements are applied to all personnel environments, including operators, maintainers, trainers
G-45 Human Systems Integration
Glossary - Automatic Belt TensionerJ2198_202109 (Current)09/10/2021
This glossary was written to provide a consistent and uniform definition of terms used in describing an automatic belt tensioner as it applies to an automotive accessory drive system.
Belt Drive (Automotive) Systems Committee
Autoliv’s Sound and Vibration Laboratory for Automotive Safety Component Development2021-01-109508/31/2021
The new sound and vibration laboratory at Autoliv’s Ogden Technical Center (OTC) was purpose-built with a focus on automotive safety restraint product development (air bags, seat belts, steering wheels, etc.). The laboratory requirements stem from the continued industry trend of quieter vehicles which drives the need for components with extremely low levels of rattle noise. The laboratory at OTC complements similar Autoliv testing facilities around the world. Test articles range from several cubic inches up to approximately one cubic foot and contain varying degrees of moving elements. With the new laboratory at OTC, Autoliv can test new product designs earlier in the development process and obtain test results and feedback faster. The function of the OTC test lab is vibration-induced rattle noise; shake components with a known input and measure the resulting noise. To provide an acceptable signal to noise ratio, the new laboratory was designed to have a 25 dBA re 20 μPa noise floor
Morgan, Christopher, Rozema, Randy, Knight, Timothy
Combination Pelvic and Upper Torso Operator and Occupant Restraint Systems for Off-Road Work MachinesJ2292_202108 (Current)08/12/2021
This SAE Recommended Practice establishes minimum performance and test requirements for combination pelvic and upper torso occupant restraint systems provided for off-road self-propelled work machines.
HFTC4, Operator Seating and Ride
Minimum Standard for Portable Gaseous, Oxygen EquipmentAS1046C (Current)08/11/2021
This standard is intended to apply to portable compressed gaseous oxygen equipment. When properly configured, this equipment is used either for the administration of supplemental oxygen, first aid oxygen or smoke protection to one or more occupants of either private or commercial transport aircraft. This standard is applicable to the following types of portable oxygen equipment: a Continuous flow 1 Pre-set 2 Adjustable 3 Automatic b Demand flow 1 Straight-demand 2 Diluter-demand 3 Pressure-demand c Combination continuous flow and demand flow.
A-10 Aircraft Oxygen Equipment Committee
Performance Standard for Cabin Crew Portable Protective Breathing Equipment for Use During Aircraft EmergenciesAS8047 (Current)08/09/2021
This aerospace standard (AS) defines the requirements of portable protective breathing equipment for use during smoke/fire conditions on board an aircraft.
A-10 Aircraft Oxygen Equipment Committee
Safety Considerations of Carry-On Baggage Relating to the Emergency Evacuation of Transport Category AircraftARP4072A (Current)05/20/2021
This SAE Aerospace Recommended Practice (ARP) provides information and recommended guidelines for handling carry-on baggage prior to emergencies and during the emergency evacuation of transport category aircraft. Recommendations are provided on limiting the size, amount, and weight of carry-on baggage brought into the cabin, improved stowage of carry-on baggage to minimize hazards to passengers in flight and during emergency evacuations, and procedures to ensure carry-on baggage is not removed during an emergency evacuation.
S-9B Cabin Interiors and Furnishings Committee
Human Engineering - Principles and PracticesHEB1D (Current)04/14/2021
This Engineering Bulletin and its annexes provide guidance on the application of Human Engineering principles and practices to the analysis, design, development, testing, fielding, support, accident investigation, and training for military and commercial products throughout their intended life cycles.
G-45 Human Systems Integration
Seat Design Parameters and Its Influence on Performance Metrics of FMVSS 202a Back Set Retention Test2021-01-092704/06/2021
Automotive Seat design is driven by various design factors considering occupant safety, occupant comfort, road visibility etc. Seats are generally a combination of structural frames, foams, suspension wires, adjustment mechanisms etc. to support safety, comfort & road visibility. Most of the regulatory tests on seats are related to safety which demands structural integrity of seat frames, welds and bolts etc. And few tests demand occupant comfort and seat functionality involving foams, suspension wires & adjustment mechanisms. There are few tests which needs design consideration on all seat components discussed above. FMVSS 202a Back Set Retention is one among them. It is a static test with multiple loads in sequence of loading and unloading steps on the seat back and head restraint. Stiffness of the foams, lumbar mats, seat adjustment mechanisms, seat frames contribute a lot to meet performance targets set by the regulation. This technical paper discusses various design factors, their
Purnoo Munuswamy, Ravi, ThamnampudiI, Ramasubba Reddy, Shanmugam, Seenuvasan, Muthupandian, Arunachalam, Holur, Prabhu
Seat Performance in Rear Impacts: Seatback Deflection and Energy Dissipation2021-01-091604/06/2021
Occupant protection in rear crashes is complex. While seatbelts and head restraints are effective in rear impacts, seatbacks offer the primary restraint component to front-seat occupants in rear impacts. Seatback deflection due to occupant loading can occur in a previous rear crash and/or in multiple-rear event crashes. Seatback deflection will in-turn affect the plastic seatback deformation and energy absorption capabilities of the seat. This study was conducted to provide information on seatback deflection and seat energy consumption in low and high-speed rear impacts. The results can be used to examine seatback deflection and energy consumed in a previous rear impact, or in collisions with multiple rear impacts. Prior seatback deflection and energy absorption can affect the total remaining energy absorption and seat performance for a subsequent rear impact. Rear sled tests included eight 16 km/h tests conducted with the BioRID and eight matched 40 km/h tests with the 50th percentile
White, Samuel, Parenteau, Chantal, Burnett, Roger
Effect of ATD Size, Vehicle Interior and Restraint Misuse on Second-Row Occupant Kinematics in Frontal Sled Tests2021-01-091404/06/2021
Interest in rear-seat occupant safety has increased in recent years. Information relevant to rear-seat occupant interior space and kinematics are needed to evaluate injury risks in real-world accidents. This study was conducted to first assess the effect of size and restraint conditions, including belt misuse, on second-row occupant kinematics and to then document key clearance measurements for an Anthropomorphic Test Device (ATD) seated in the second row in modern vehicles from model years 2015-2020. Twenty-two tests were performed with non-instrumented ATDs; three with a 5th percentile female Hybrid III, 10 tests with a 10-year-old Hybrid III, and 9 tests with a 6-year-old Hybrid III. Test conditions included two sled bucks (mid-size car and sport utility vehicle (SUV)), two test speeds (56 and 64 km/h), and various restraint configurations (properly restrained and improperly restrained configurations). Head and knee trajectories were assessed. Head excursion was 38 percent greater
Parenteau, Chantal, Burnett, Roger, Danthurthi, Sri Sai Kameshwari, Andrecovich, Christopher
Child Restraint Systems (CRS) with Minor Installation Incompatibilities in Far Side Impacts2021-01-091504/06/2021
Side impacts are disproportionately injurious for children compared to other crash directions. Far side impacts allow for substantial translation and rotation of child restraint systems (CRS) because the CRS does not typically interact with any adjacent structures. The goal of this study is to determine whether minor installation incompatibilities between CRS and vehicle seats cause safety issues in far side crashes. Four non-ideal CRS installation conditions were compared against control conditions having good fit. Two repetitions of each condition were run. The conditions tested were: 1) rear-facing (RF) CRS installed with a pool noodle to create proper recline angle, 2) RF CRS with narrow base, 3) forward-facing (FF) CRS with gap behind back near seat bight (i.e., vehicle seat angle too acute for CRS), 4) FF CRS with gap behind back near top of CRS (i.e., vehicle seat angle too obtuse for CRS). Second row captain’s chairs were set up at 10° anterior of lateral. A sled pulse target
Mansfield, Julie, Kwon, HyunJung, Kang, Yun Seok
The Analytical Method for Calculating the Hysteretic Behavior of an Asymmetry Tensioner2021-01-065504/06/2021
An automatic tensioner with an asymmetric damping structure used in an engine front end accessory drive system is analyzed. An analytical model is established to calculate the hysteretic behavior of the tensioner. The contact characteristics of contact pairs are modeled and investigated for disclosing relation between contact pair, friction and hysteretic loop of an automatic belt tensioner. The presented models are validated by a torque measurement versus angular displacement of a tensioning arm. The errors between the calculation and the measurement are analyzed. The working torques of the tensioner during loading and unloading process are described by a bilinear hysteretic model and are written as a function with a damping ratio. The influence of damping structure parameters on the hysteretic torque is investigated. The method presented in this paper can be used for predicting the nonlinear characteristics of a tensioner before prototyping.
Deng, Zheng, Zhen, Ran, Li, Ruilong, Sun, Yi, Shangguan, Wen-Bin
Crashworthiness Optimization of Hydraulic Excavator Cab Roof Rail and Safety Prediction: Finite Element Analysis and Experimental Validation2021-01-092504/06/2021
Off-road trucks, tractors and earth-moving machines are at high risk of accidents involving falling objects or rollovers. Therefore, these machines need proper protective structures to protect operators. This study investigates the crashworthiness optimization of a hydraulic excavator cab roof rail based on an improved bi-directional evolutionary structural optimization (BESO) method considering two different load cases (a lateral quasi-static load and an impact load from the top of cab, respectively). In the crashworthiness optimization problem, a weighted summation of external works done by the two different load cases is treated as the objective function while the volume of design domain is treated as the constraint. A mutative weight scheme is proposed to stabilize the optimization and balance the two load cases. Finite element (FE) model is established and two prototypes are fabricated based on the optimal design. Explicit FE analysis is used to predict the performance of roll
Ma, Chao, Liu, Zhe, Duan, Yuexing, Gao, Yunkai
Incidence and Mechanism of Head, Cervical Spine, Lumbar Spine, and Lower Extremity Injuries for Occupants in Low- to Moderate-Speed Frontal Collisions2021-01-090204/06/2021
Automotive accidents and subsequent personal injury claims incur substantial costs annually. While three-point restraint usage, dual-stage airbags, and knee bolster and side curtain airbags have become more ubiquitous and, in some cases, governmentally mandated for front seat occupants, occupant safety and injury risk assessment continue to be at the forefront of automotive innovation. In this study, we combined analyses of the National Automotive Sampling System Crashworthiness Data System (NASS-CDS; 2007-2015) and the Crash Investigation Sampling System (CISS; 2017) with data acquired from vehicle-to-vehicle crash tests conducted with instrumented anthropomorphic test device (ATD) occupants. Together, these analyses were used to compare and relate field injury rates with potential injury mechanisms in low- to moderate-speed frontal collisions. First, low- to moderate-speed (delta-V ≤ 24 km/h) frontal crash data from NASS-CDS and CISS were analyzed to estimate the rate of AIS 2+ and
Davis, M., Mkandawire, C., Brown, T., Pasquesi, S.
Validation of EEPROM Chip Removal and Reinstallation for Retrieval of Electronic Crash Data - Destructive and Non-Destructive Methods2021-01-090704/06/2021
As a result of trauma to the circuit board or other damage to an airbag control module (ACM), electronic crash data recorded onto a passenger vehicle’s electronically erasable programmable read-only memory (EEPROM) chip may be inaccessible by traditional imaging methods and techniques, such as through a diagnostic link connector (DLC) or accessing the data directly from the ACM. Despite the potential damage to the subject module, electronic crash data may still be present on the module’s EEPROM chip. This paper explores and validates a methodology for the removal and reinstallation of a subject EEPROM chip using an identical undamaged exemplar airbag control module and a non-destructive clip-assisted method to gain access to the subject electronic crash data. ACMs were obtained from a 2016 BMW 740i, 2015 Toyota Corolla, 2014 Nissan 370z, 2006 Lexus IS350, 2015 Maserati Ghibli, and 2017 Audi A4. Each module was imaged prior to the chip swap procedure. Each of the six EEPROM memory chips
Zeitler, Jason P., Palmer, Jacob, Smith, Connor
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