Browse Topic: Performance tests

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Post-EOL Cybersecurity Validation for Automotive Production ECUs2026-26-0608To be published on 01/16/2026
ISO/SAE 21434 emphasizes comprehensive cybersecurity risk management throughout the automotive lifecycle. However, specific guidance on validating cybersecurity measures at the production level remains limited. This paper addresses the gap in production-stage validation, particularly after End-of-Line (EOL) flashing, which includes configurations of security hardware and software protection (e.g., UCB confirmation, JTAG, and P-flash password settings). Problem articulation: Current automotive cybersecurity validation methods, despite adherence to ISO/SAE 21434, lack specific procedures for the production stage. The existing system-level validation using the ASPICE V-model (e.g., SWE.6, SYS.5) does not ensure the integrity and functionality of cybersecurity features in the final manufactured unit post-EOL flashing. This gap poses a risk of vulnerabilities being introduced during the EOL process, compromising critical security measures. Proposed solution: To mitigate the cybersecurity
Chakraborty, Sucheta, Kulanthaisamy, Nagarajan, Sankar, Ganesh
Design Robustness of Electronic Locking Differential for enhanced off-road performance2026-26-0502To be published on 01/16/2026
The Electronic Locking Differential (ELD) is a critical component for enhancing off-road vehicle performance by ensuring optimal traction in challenging terrains. This paper addresses intermittent engagement issues observed in the ELD system during off-road trials, which impacted its reliability and functionality. It presents a comprehensive study of design robustness improvements implemented to resolve these concerns and optimize the ELD’s performance, ensuring enhanced customer satisfaction in demanding off-road environments. The analysis begins with identifying factors contributing to the intermittent engagement and disengagement of the ELD system upon actuation. These factors include residual magnetism, material properties, temperature effects, and the stack-up characteristics of transfer path components under various boundary conditions. To address these challenges, three key design modifications were introduced: (1) reduction of residual magnetism through an increased air gap
S, Mohd Imtiaz, AP, Baaheedharan, Ghumare, Dheeraj, Kanagaraj, Pothiraj, Jain, Saurabh Kumar
Steel-based Laminates for Lithium-ion Pouch Cell of Electric Vehicles2026-26-0186To be published on 01/16/2026
Aluminium foils have gained traction with EV battery manufacturers for their pouch cell format. Over the years it has evolved as a material of choice, but it is still plagued by issues of stress concentration, swelling due to lower strength and stiffness of base aluminium layer. Preliminary investigation revealed that laminates using steel foil material (thickness <0.1mm) could be a potential candidate for EV pouch cell casing. Thus, steel-based laminate was developed meeting key functional requirements (e.g. barrier performance, insulation resistance, peel strength, electrolyte resistance, formable without cracking at edges, and heat sealing compliant). This innovative patented steel-based laminate was further used to manufacture pouch cell prototypes (maximum capacity 2.5Ah) for key performance tests (e.g. cell cycling, nail penetration and thermal runaway). The study paves the way for a low cost, sustainable and flexible yet strong steel-based laminate packaging material solution
Singh, Pundan Kumar, Raj, Abhishek, Kumar, Ankit, Chatterjee, Sourabh, Verma, Rahul Kumar, Samantaray, Bikash, Gautam, Vikas, Pandey, Ashwani
Aerospace - Test Methodology for Electrohydrostatic ActuatorsARP5879A (Current)11/26/2025
This document provides an overview of the tests and issues related to testing that are unique to Electrohydrostatic Actuators (EHAs). An EHA incorporates a linear or rotary hydraulic actuator and a variable speed, reversible electric servomotor driving a fixed displacement hydraulic pump for actuator control, and associated power drive electronics. The tests and issues documented are not necessarily all-inclusive. This document discusses both, the tests applicable to EHAs and the test methodologies to accomplish the test objectives. This document also lists tests that are not unique to EHAs, but are still applicable to EHAs. In these instances a discussion of such tests is not contained in this document, and as applicable, the reader may reference ARP1281 (Actuators: Aircraft Flight Controls, Power Operated, Hydraulic, General Specification For), which addresses test issues applicable to electrohydraulic flight control servoactuators. In the discussion of the tests and test
A-6B2 Electrohydrostatic Actuation Committee
Improving the Performance of the Air Conditioning Unit in Different Locations of a City Bus and Lightening the Air Ducts2022-01-504406/03/2022
The focus of this study is to validate vehicle test results of the air conditioning (AC) unit in a city bus and perform a comparative computational fluid dynamics (CFD) analysis on homogenizing the cabin air distribution in different AC unit locations on the rooftop. To validate CFD practical results, a vehicle test was performed outdoor during the AC unit works. Obtained test results based on airflow rate inside AC unit and also measured velocity values on the front cabin of air duct were validated without completely modeling the whole AC unit and indoor cabin via CFD. With this simplified method, it is thought that this approach can give an idea for new prototype air duct designs in relevant industries. Another advantage to this approach is that it avoids high mesh density near the radial fans (blowers) placed on the AC unit. Foam placed in air ducts as insulation and air blockage material is also optimized for air distribution in the indoor cabin. In conclusion, several foams and
Özcan, Onur, Demirtaş, Servet, Yıldız, Alp Eren, Coşkun, Atakan
Brake Lining Quality Test ProcedureJ661_202110 (Current)10/26/2021
The purpose of this SAE Recommended Practice is to establish a uniform laboratory procedure for securing and reporting the friction and wear characteristics of brake linings. The performance data obtained can be used for in-plant quality control by brake lining manufacturers and for the quality assessment of incoming shipments by the purchasers of brake linings.
Brake Linings Standards Committee
Android Automotive testing Solution2021-26-045409/22/2021
In current automotive industry OEMs and suppliers are facing the ever-increased challenge to provide in-vehicle infotainment features that are exciting to their customers. Hence android devices are becoming exceptionally adopted because of its enhanced customer experience with mobility and connectivity, Increased customization, openness and scalability. With android automotive, car makers can create powerful infotainment systems designed for the digital age. This paper deals with the various testing solutions for Android infotainment System. It covers functional and non-functional testing solution and tools for an android RSE (Rear Seat Entertainment) system manually and with automation. Automation includes the use of Generic Test Automation Framework with the help of automated test failure log analyzer and integration of car simulation. In the fast-moving era, there is always a need of faster delivery and feedback with better quality. Hence Continuous Integration and Continuous
K, SONA BABU, Vishwakarma, Rishika
Off-Highway Machine Fuel Performance Prediction Through Engine Data Analytics2021-26-031909/22/2021
Field performance of a machine is conventionally analyzed using tools of virtual validation such as physics-based simulations models. Machine performance test data is typically not incorporated for machine performance evaluation using these tools. The present work aims to demonstrate use of Data Analytics as a tool to analyze this data for predictive purpose. It aims at establishing numerical relationships of engineering interest within the data, which would otherwise be complex if done only using physics-based models. Engine operation data spanning over three months, comprising of more than sixty channels, of an off-highway machine is used for model development. Machine fuel burn rate is chosen as the dependent variable. Several independent variables such as Ambient temperature, Engine speed, Charge air pressure are chosen based on their correlation with the dependent variable and upon engineering interest. Linear regression models are developed which show good fit and correlation
Bandekar, Ameya, Dharmadhikari, Nitin
Development of Closed Loop Power Recirculating Type Test Rig - Higher Torque Ranges2021-26-049109/22/2021
In the past decades, many impressive progress has been made in the rig development for the gear validation. But, the challenges are to test the entire gear box for the improvement in the single gear alone to ascertain material quality or process improvement, that too with the higher torque range gear boxes, which requires huge investment and power consumption due to high capacity test rig / dynamometer. This paper deals with an experimental validation of the dynamic model for a gear pair test system, representative of a closed loop power recirculating type test rig. Being a closed loop, this system has its own uniqueness, that, it uses the low capacity prime mover, which considers the initial starting loop torque only, to cater the high power requirement in an efficient manner. The key intend of the development of this rig is to reduce the testing from system level to sub component level with low cost operation and more competence for the gears of high torque application. This also
Rajaraman, Manikandan, Srinivasan, Sriraman, Muthu kumar, Pandurangan, N, Gopi Kannan
Performance Evaluation of Various Structural Damping Materials for Application in Electric Vehicles2021-01-112408/31/2021
The ongoing electrification of passenger car propulsion systems has an impact on vehicle acoustic quality due to the different excitation characteristics of electrical drives compared to internal combustion engines. The airborne noise and structural vibrations, induced by electric motor, have higher frequency components and they influence the application of acoustic countermeasures in the vehicle. One important element of these treatments is the structural damping package, which can include monolayer damping such as liquid applied sound damping (LASD) as well as bitumen or polymer-based dampers and various multilayer constraint layer damping materials. The performance of damping materials is commonly characterized by the loss factor and estimated by the well-known Oberst Beam Method. Major drawbacks of this method are the measurement limitations to composite loss factors less than 0.3, lower frequency range (less than 500 Hz) and the overall inability to evaluate materials in the
Unruh, Oliver, Fuhrmann, Bernd, Obst, Heike-Ursula
Performance Evaluation of Eastman’s Saflex® E Series Acoustic Interlayer2021-01-105408/31/2021
In 2020, Eastman launched a new acoustic PVB interlayer for automotive laminated glass. This interlayer not only helps to protect driver and passengers from injuries during impact but also provides enhanced acoustic comfort in the car. This newly developed interlayer offers substantially improved acoustic performance in the high-frequency range that is typically associated with wind noise at higher vehicle speeds. To demonstrate the in-vehicle performance, finite element simulations have been carried out using wind noise as the principal source of excitation. The results confirm previously published data that the acoustic contribution overwhelms the turbulent part, having a larger contribution to the ultimate acoustical pressure level. The acoustic insulation calculated is in excellent agreement with the static sound transmission loss data as measured according to the ISO or ASTM norm. In cases where both the windscreen and front-side windows have a laminated structure, a large
D'Haene, Pol, Van de Vyver, Stijn, Poulos, Athanasios, Robin, Xavier
Interior Noise and Tactile Vibration Refinement of Commercial Vehicle Through Experimental Analysis2021-01-107308/31/2021
Noise & Vibration refinement of automotive vehicles is becoming important parameter due to its influence on environmental aspect and comfort perceived by occupants. NVH parameters are driving factors in current vehicle design strategy. Drivers comfort is extremely important, and driver’s expectations from commercial and heavy-duty trucks are as good as refined passenger cars. Other trends in commercial vehicle segment such as engine downsizing, weight, cost reduction and meeting stringent emission norms have influenced vehicle design dynamics. These parameters are critical and often contribute to vehicle NVH issues. Considering these new trends in commercial vehicle segment, it becomes challenging for an NVH engineer to provide optimized solutions. NVH issues could be related to the various subsystems such as driveline, axle, transmission steering wheel etc. in the vehicle and its resonant frequencies. In commercial vehicles, driveline design parameters, power train mounting system and
Sankpal, Kiran, Thakur, Sunil, Kunde, Sagar, Wagh, Sachin, Sharma, Vijay
Performance Test for Windshield Defrosting Systems for Off-Road, Self-Propelled Work MachinesJ1535_202108 (Current)08/02/2021
This SAE Standard establishes uniform test procedures for the defrosting systems of off-road, self-propelled work machines used in construction, general purpose industrial, agricultural, and forestry machinery as referenced in table one of this document. It includes tests that can be conducted with uniform test equipment in commercially available laboratory facilities, as well as in an appropriate outdoor environment.
HFTC6, Operator Accommodation
Continuously Variable Displacement Drive for Engines Part 1, Performance Simulation2021-01-044204/06/2021
A new type of drive system has been designed, analyzed, patented, prototyped, and tested. The drive’s unique capabilities include the ability to vary the bottom dead center position to reduce the stroke, and simultaneously vary the top dead center position to achieve the desired compression ratio with one simple, low friction mechanism. The purpose of the concept is to reduce losses associated with operation at partial load as most engines spend a preponderance of their operating life at partial load. Cummins sponsored engine simulation of the CVD configured as a 9-cylinder gasoline engine cycle and a baseline engine which was a conventional V8 engine of the same displacement and compression ratio. The study showed a ~30% improvement in fuel economy on a 10-mode weighted cycle that was designed by Cummins to simulate the FTP cycle. This paper covers the performance analysis while SAE 2021-01-0451, “Continuously Variable Displacement Drive for Engines, Part 2, Design, Analysis, and Test
Arnold, Steven, Tillock, Brad
Automatic Pilots (Turbine Powered Subsonic Aircraft)AS440B (Current)12/22/2020
This SAE Aerospace Standard (AS) covers automatic pilots intended for use on aircraft to automatically operate the primary and trim aerodynamic controls to maintain stable flight and/or to provide maneuvering about any of the three axes through servo control. Automatic control functions essential for primary or augmented flight control are excluded.
A-4 Aircraft Instruments Committee
Maximum-Allowable-Airspeed Instruments (Turbine Powered Subsonic Aircraft)AS437B (Current)12/22/2020
This SAE Aerospace Standard (AS) covers one type of maximum-allowable-airspeed instrument which gives a continuous indication of both indicated airspeed and maximum allowable airspeed not exceeding 650 knots.
A-4 Aircraft Instruments Committee
Maximum-Allowable-Airspeed Instruments (Turbine Powered Subsonic Aircraft)AS437B-TEST-REC (Historical)12/22/2020
This SAE Aerospace Standard (AS) covers one type of maximum-allowable-airspeed instrument which gives a continuous indication of both indicated airspeed and maximum allowable airspeed not exceeding 650 knots.
A-4 Aircraft Instruments Committee
New SAE wireless charging standard is EV game-changer20AUTP11_0611/01/2020
SAE International on October 22 announced publication of the first global standard that specifies, in a single document, both the electric vehicle- and supply equipment (EVSE) ground-system requirements for wireless charging of electric vehicles (EV). The new standard, SAE J2954 [https://www.sae.org/standards/content/j2954_202010/], helps pave the way for charging without the need for plugging in - widely considered to be a key enabler for accelerating the adoption of EVs and autonomous vehicles. The new standard was more than a decade in the making. SAE kicked off its pioneering pre-competitive research at a time when few contemporary electric cars existed and wireless power transfer (WPT) systems for EVs were an unproven concept. The SAE J2954 Wireless Power Transfer and Alignment Taskforce worked since 2007 to thoroughly vet and test the technology, in partnership with government agencies, regulatory bodies and private-industry groups including the American Association of Medical
Shuttleworth, Jennifer
A Comparative Study On-Dynamometer Performance Evaluation of Fly Ash Containing Non Ferrous Organic and Low-Metallic Disc Brake Pads for Passenger Vehicles and Thereby Promoting a Very Cheap Inorganic Filler Available in Abundance2020-01-161310/05/2020
A number of functional and non- functional fillers are invariably used for friction material composites. In recent years disposal of fly ash has been a big challenge due to low availability of damping sites. Current work investigates the characterization of Low -metallic and Organic composites made with fly ash with variable concentrations and evaluated for braking performance (SAE J2522) & wear (SAE J2707) on a brake inertia dynamometer. Composites have been characterized for their physical, thermal, mechanical and tribological performance. Low-metal based composites (LMBC) have shown better thermal resistance than non-ferrous organic formulation based composites (NFOC). Mechanical properties such as hardness, shear strength and compressibility have been found to be similar for both the composites. NFOC composites have shown better wear resistance while acquiring slightly lower coefficient of friction values. Load-speed sensitivity of the composites has been further investigated to
Tomar, Bharat Singh, Ali, Sharafat, Ellis, Keith, Choudhary, Yogesh
Changing Properties of Brake Pads and Discs during Brake Testing2020-01-162810/05/2020
Earlier publications show that brake pad physical properties such as hardness, modulus and natural frequencies continue to increase at room temperature over a period of 12 months and that the changes are faster during the first 3 - 6 months. The current investigation was undertaken to see how the properties might change during testing for the pads as well as for the discs. Low-copper and copper-free formulations were tested on pickup truck and passenger car brakes. In all cases, the dynamic modulus and natural frequencies are found to decrease (not increase) after the SAE J2522 performance testing, indicating that the stiffness of the pad and that of the disc decrease faster than the mass loss due to wear. Also, the inboard pad and the outboard pad change at two different rates. Questions arise on what properties to measure for quality assurance and when to measure in light of these changing properties as well as the fact that the relationship between the initial properties and the
Sriwiboon, Meechai, Tiempan, Nipon, Kaewlob, Kritsana, Rhee, Seong Kwan
Medical Device Package Testing: Developing a Test Plan that Avoids Product Launch DelaysTBMG-3758709/01/2020
By Sunny J. Modi, PhD, Director of Package Testing for Eurofins Medical Device Testing, Lancaster, PA
Air Dryer Test ProcedureJ2384_202008 (Current)08/26/2020
This SAE Recommended Practice establishes uniform test procedures for desiccant air dryers used in vehicles with compressed air systems per SAE J2383. Continuous flow desiccant air dryers are excluded from the scope of this document.
Truck and Bus Brake Supply and Control Components Committee
Truck and Bus Grade Parking Performance Test ProcedureJ360_202008 (Current)08/19/2020
This SAE Recommended Practice establishes methods to determine grade parking performance with respect to: a. Ability of the parking brake system to lock the braked wheels. b. The vehicle holding or sliding on the grade, fully loaded or unloaded. c. Applied manual effort. d. Unburnished or burnished brake lining friction conditions. e. Down and up grade directions.
Truck and Bus Brake Systems Committee
Air Data Computer – Minimum Performance StandardAS8002B (Current)04/28/2020
This SAE Aerospace Standard (AS) covers air data computer equipment (hereinafter designated the computer) which when connected to sources of aircraft electrical power, static pressure, total pressure, outside air temperature, and others specified by the manufacturer (singly or in combination) provides some or all of the following computed air data output signals (in analog and/or digital form) which may supply primary and/or standby flight instruments: Pressure Altitude Pressure Altitude, Baro-Corrected Vertical Speed Calibrated Airspeed Mach Number Maximum Allowable Airspeed Over-speed Warning Total Air Temperature
A-4 Air Data Subcommittee
Air Data Computer – Minimum Performance StandardAS8002B-TEST-REC (Historical)04/28/2020
This SAE Aerospace Standard (AS) covers air data computer equipment (hereinafter designated the computer) which when connected to sources of aircraft electrical power, static pressure, total pressure, outside air temperature, and others specified by the manufacturer (singly or in combination) provides some or all of the following computed air data output signals (in analog and/or digital form) which may supply primary and/or standby flight instruments: Pressure Altitude Pressure Altitude, Baro-Corrected Vertical Speed Calibrated Airspeed Mach Number Maximum Allowable Airspeed Over-speed Warning Total Air Temperature
A-4 Air Data Subcommittee
Clamp Assembly, Saddle Type, Cushioned, General Specification ForAS85449B (Current)04/21/2020
This SAE Aerospace Standard (AS) defines the requirements for saddle-type clamps. Tests and criteria noted do not indicate any specific areas of application or usage. Supplemental testing may be necessary to determine suitability for specific environments and applications.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Clamp Assembly, Saddle Type, Cushioned, General Specification ForAS85449B-TEST-REC (Historical)04/21/2020
This SAE Aerospace Standard (AS) defines the requirements for saddle-type clamps. Tests and criteria noted do not indicate any specific areas of application or usage. Supplemental testing may be necessary to determine suitability for specific environments and applications.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight RatingJ2807_202002 (Current)02/13/2020
This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles, and trucks. This includes all vehicles up to 14000 pounds GVWR.
Tow Vehicle Trailer Rating Committee
Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight RatingJ2807_202002-TEST-REC (Historical)02/13/2020
This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles, and trucks. This includes all vehicles up to 14000 pounds GVWR.
Tow Vehicle Trailer Rating Committee
Performance Specification for Automotive Electrical Connector SystemsUSCAR2-7 (Current)02/03/2020
Procedures included within this specification are intended to cover performance testing at all phases of development, production, and field analysis of electrical terminals, connectors, and components that constitute the electrical connection systems in low voltage (0 to 20 VDC) road vehicle applications. These procedures are only applicable to terminals used for In-Line, Header, and Device Connector systems. They are not applicable to Edge Board connector systems, twist lock connector systems, >20 VAC or DC, or to eyelet terminals. No electrical connector, terminal, or related component may be represented as having met USCAR/EWCAP specifications unless conformance to all applicable requirements of this specification have been verified and documented. All required verification and documentation must be done by the supplier of the part or parts. If testing is performed by another source, it does not relieve the primary supplier of responsibility for documentation (DVP&R) of all test
USCAR
Better Solutions for Testing and Measuring Compression and Extension SpringsTBMG-3595602/01/2020
The design, manufacture, and use of springs can be traced back in time to The Bronze Age. Spring design is a science based on complex arithmetic calculations combined with material science. Springs are used in everyday consumer devices including cellular phones and computers, in industrial applications including automotive and aerospace, and in precision medical devices where a spring with a diameter of .0036” (about equal to the size of a human hair) is used in catheters and endoscopic instruments.
Performance Specification for Cable-to-Terminal Electrical CrimpsUSCAR21-4 (Current)01/22/2020
This specification defines test methods and requirements for validation of solderless crimped connections. The purpose of this test is to simulate in the lab the stress seen in a typical life (15 years and 150000 miles) for a crimp connection and assure the crimp is mechanically strong and electrically stable. This specification was developed for use with stranded automotive copper wire. Only where specifically mentioned are other constructions or other core materials (aluminum, clad, steel core, etc.) applicable. This specification does not apply to wire types not mentioned, such as coaxial cable crimps, unless a USCAR-21 test is specifically referenced in the test specification for that wire type. This specification is based on accepted levels of environmental exposure for automotive applications. In any intended vehicle application, if the products covered by this specification are or may be subjected to conditions beyond those described in this document, they must pass special
USCAR
O-Ring Machined from AMS3617 MaterialAS9772A (Current)01/13/2020
This standard establishes the dimensional and visual quality requirements, lot requirements, and packaging and labeling requirements for O-rings machined from AMS3617 polyamide material. It shall be used for procurement purposes.
A-6C2 Seals Committee
Performance Specifications for a Midsize Male Pedestrian Research DummyJ2782_201911 (Current)11/26/2019
While it is recognized that collisions involve pedestrians of all sizes, this Information Report addresses performance specifications for a midsize adult male research dummy. This approach stems from the greater knowledge of biomechanics and existing dummy technologies for the midsize male relative to other adult sizes and children. While not the initial objective, it is envisioned that additional performance specifications for other sizes of pedestrian research dummies will be developed in the future based on accepted scaling procedures. The specific requirements for the pedestrian dummy have been based on a collective assessment of pedestrian injury, response, and anthropometry priorities from the experimental, epidemiologic, and computational literature. In general, the objective was to specify performance specifications based on human characteristics and the impact response of post-mortem human subjects rather than to specify the design of a particular physical device. Based on the
Human Biomechanics and Simulations Standards Committee
Performance Specifications for a Midsize Male Pedestrian Research DummyJ2782_201911-TEST-REC (Historical)11/26/2019
While it is recognized that collisions involve pedestrians of all sizes, this Information Report addresses performance specifications for a midsize adult male research dummy. This approach stems from the greater knowledge of biomechanics and existing dummy technologies for the midsize male relative to other adult sizes and children. While not the initial objective, it is envisioned that additional performance specifications for other sizes of pedestrian research dummies will be developed in the future based on accepted scaling procedures. The specific requirements for the pedestrian dummy have been based on a collective assessment of pedestrian injury, response, and anthropometry priorities from the experimental, epidemiologic, and computational literature. In general, the objective was to specify performance specifications based on human characteristics and the impact response of post-mortem human subjects rather than to specify the design of a particular physical device. Based on the
Human Biomechanics and Simulations Standards Committee
Seat Belt Dynamic Test Performance Sensitivity to Anchorage Location Tolerance of 50 mm2019-28-239811/21/2019
Seat Belt Assemblies used in a vehicle are tested and certified as per ECE R16/ IS 15140 for its performance during dynamic test. During validation test, seat belt anchorages are set-up as per design condition. The tolerance provided in the regulation for each anchorage is 50mm. Also there is difference in actual anchorage location in a vehicle and design location. This tolerance and variation can affect the performance of seat belt during the test or actual car accident. This study shows the variation of seat belt performance when different combination of anchorage locations is used within 50 mm.
Gupta, Akshat
Requirements for Accreditation of Testing Laboratories for Organic CoatingsAS5505A (Current)10/28/2019
This document provides interpretation of ISO/IEC 17025 and establishes additional requirements for accreditation of testing laboratories for evaluating organic coatings.
AMS G8 Aerospace Organic Coatings Committee
Brake Rating Power Requirements - Truck and BusJ257_201907 (Current)07/18/2019
The minimum performance values in this SAE Recommended Practice are applicable to vehicles with brake systems having typical service pressure ranges 0 to 16.6 MPa (0 to 2400 psi) hydraulic or 0 to 945 kPa (0 to 135 psi) air only. SAE J880 not only provides for determining maximum brake rating power capability, but also permits verification of any desired or arbitrary level such as the requirement established herein. The determining criteria for deciding brake rating power capability are: a. Cold brake stopping ability. b. Fade as a result of brake power absorption. c. Hot brake stopping ability following brake power absorption. d. Brake system stability following brake power absorption. e. Functional and structural integrity of brake system following test.
Truck and Bus Brake Systems Committee
Performance Testing and Analysis of Multi-Channel Active Control System for Vehicle Interior Noise Using Adaptive Notch Filter2019-01-156706/05/2019
It is considered that slow convergence speed and large calculation amount of commonly used adaptive algorithm in the active control system for vehicle interior noise yield noise reduction performance and hardware requirements problems. In this paper, a 4-channel active control of vehicle interior noise based on adaptive notch filter is established, and road test is carried out to test and analyze the performance of the control system. Firstly, the general mathematic model of the multi-channel active control system based on adaptive notch filter is established. The computational complexity of the algorithm is analyzed and compared with that of the FXLMS algorithm. Secondly, a hardware-in-the-loop test bench based on multi-channel adaptive notch filter is set up, to measure the noise reduction performance of ANC system under various working conditions. Finally, the typical test conditions are designed to test the system noise reduction performance, and the road test is carried out and
Zhang, Lijun, Zhang, Xiyu, Meng, Dejian
The ‘Relativity’ of High Q CapacitorsTBMG-3455706/01/2019
For many high-power RF applications, the “Q factor” of embedded capacitors is one of the most important characteristics in the design of circuits. This includes products such as cellular/telecom equipment, MRI coils, plasma generators, lasers, and other medical, military, and industrial electronics.
New Performance Metrics for Lidar19AVEP05_0705/01/2019
Frame-rate measurement is so yesterday. Object-revisit rate and instantaneous resolution are more relevant metrics, and indicative of what a lidar system can and should do, argues a revolutionary in the artificial-perception space. How do you measure the effectiveness of an intelligent, lidar-based perception system for autonomous vehicles? Conventional evaluation metrics favor frame rate and resolution as the ideal criteria. However, experts at Pleasanton, Calif.-based artificial perception company AEye believe that these criteria are inadequate for measuring the unique capabilities of more advanced lidar systems, nor do they explicitly address real-world problems facing autonomous driving, such as hazard detection and tracking. “Makers of automotive lidar systems are frequently asked about their frame rate, and whether or not their technology has the ability to detect objects with 10% reflectivity at a specified range, frame rate and resolution,” said the company's co-founder and
Vijayan, Indu
Evaluation of After-Market Light Emitting Diode Headlight Bulbs2019-01-085004/02/2019
Taking advantage of growing consumer interest in light emitting diode (LED) headlights, an increasing number of after-market LED replacement bulbs is available on the market. They are designed to have similar socket shapes and sizes as halogen bulbs, in order to fit into existing headlight housings. Although none of these LED replacement bulbs conform to present federal headlighting regulations, and some are labeled for "off road use" only, others claim to meet current regulations. Regardless, many different LED bulbs can be easily purchased and installed by vehicle owners, who may or may not be aware of their regulatory status. Several different LED replacement bulb kits, each designed to replace a conventional 55-W H11 halogen bulb, were purchased and tested in three different low-beam headlight units. Photometric measurements at several critical test points for headlight performance revealed that none of the resulting distributions met all of the test point photometric requirements
Liu, Yi-wei, Bullough, John
Investigating Cardiac Device Performance with Computer Modeling and SimulationTBMG-3371802/01/2019
Why do some people develop malfunction of their mitral valve (MV) after a heart attack? The answers are complex, and treatments are not yet perfected. But biomedical engineers are hot on the trail of better solutions thanks to advancements in computer modeling and simulation.
A Study on the Repeatability of Vehicle Ride Performance Measurements2019-26-007601/09/2019
Across the automotive industries, objective measurements and subjective assessment of vehicle ride performance are routinely carried out during development as well as validation phase. Objective measurements are receiving increased attention as they are generally believed to offer a higher degree of objectivity and repeatability compared to the subjective assessment alone. Typical industry practices include the acquisition of vehicle-occupant vibrational response on specified road sections, test surfaces on proving grounds or in a controlled input environment such as four-poster test rig. In presented work, a study is performed on the repeatability of vehicle ride performance metrics such as weighted RMS acceleration and frequency responses using the data acquired in repeated trials conducted using three different sports utility vehicles (SUVs) on a sufficiently long designated road section. Intra-vehicle and inter-vehicle ride performances are compared and studied against the
Joshi, Divyanshu, Kedia, Shubham, Muthiah, Saravanan
Design and Performance Specifications for a Generic Buck Representing a Small Family Car Used in the Assessment of Pedestrian Dummy Whole Body Impact ResponseJ3093_201901 (Current)01/08/2019
This Information Report addresses the design and performance specifications for a generic buck to be used in full-scale vehicle to pedestrian tests conducted to evaluate pedestrian dummy performance. Specifically, the buck is designed to mimic the impact response of the front end of a sedan within the small family car class during a collision with a pedestrian. The goal is to develop a generic buck with simplified geometry and a limited number of components made of clearly defined and readily available engineering materials to facilitate fabrication and reproducibility. To ensure performance of the buck, it is specified that the buck mimics the maximum crush distance, absorbed energy, and maximum force corresponding to a sedan within the small family car class during a pedestrian impact. The design and performance specifications provided in this document focus on: (1) the design specifications describing the materials and geometry of the generic buck and (2) the specific certification
Human Biomechanics and Simulations Standards Committee
Non-Asbestos Organic (NAO) Disc Pad Wear Behavior: Divergence of Thickness Loss and Weight Loss2018-01-186610/05/2018
There is anecdotal evidence that disc pad wear numbers measured in thickness loss and disc pad wear numbers measured in weight loss do not show the same wear trends after wear or performance testing. However, research papers on this topic are difficult to find. Therefore, this investigation was undertaken to study and document this behavior in detail on high-copper, low-copper and no-copper (or copper-free) NAO pads. In all cases, thickness loss measurements are found to be substantially lower than expected from the weight loss data according to the SAE J2522 test schedule. This divergence is caused by pad swelling in the pad layer adjacent to the friction contact surface during brake testing at high temperatures. In addition to formulation changes, disc pad processing conditions such as mixing time and hot molding pressure are found to affect pad swelling. As pad physical properties, especially in the layer adjacent to the friction contact surface, are expected to dynamically change
Sriwiboon, Meechai, Tiempan, Nipon, Kaewlob, Kritsana, Rhee, Seong
A Video-Based System for Measuring the Braking Performance of a Bicycle2018-01-503208/27/2018
The following article describes a methodology for using a video-based system to measure the deceleration or braking performance of a bicycle after the rider applies the brakes. The bicycle’s deceleration was calculated from the equation of motion using the initial velocity and the braking distance, which is the difference between the point of brake initiation (POBI) and the bicycle’s point of rest (POR). The POBI was determined by using a GoPro camera mounted on the chain stay near the rear axle that captured a brake light wired into the rear brakes while the test cyclist rode alongside of a 100-foot surveyor tape. The POR or more specifically where the rear wheel stopped was documented next to the 100-foot surveyor tape. This methodology was evaluated under two braking conditions: rear brake only (RBO) and front and rear brake (FARB). The results demonstrated that the video-based system provided reasonably accurate measurements, on the order of 5% for assessing the braking performance
Joganich, Timothy
Strain-Life Fatigue Data File FormatJ2409_201808 (Current)08/24/2018
SAE format for a SIMPLE Strain-Life Fatigue Data Exchange File Format. The object of this SAE Standard is to provide a simple common way to exchange strain-life fatigue data collected from ASTM E 606 axial fatigue test data.
Materials, Processes and Parts Council
Guidelines for Testing and Support of Aerospace, Fiber Optic, Inter-Connect SystemsARP5061A (Current)08/16/2018
ARP5061A provides guidelines for optical performance testing of short haul fiber optic inter-connection systems used in aerospace vehicles. The focus of this document is to introduce the proper testing tools and establish common pre- and post-installation test methods and troubleshooting methodologies.
AS-3 Fiber Optics and Applied Photonics Committee
FIBER OPTIC FERRULE MECHANICAL TRANSFERARINC846 (Current)08/06/2018
This specification covers the dimensions, performance, and quality assurance criteria for fiber optic MT contacts, including performance test requirements and procedures, suitable for use on commercial aircraft.
Airlines Electronic Engineering Committee
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