This SAE Recommended Practice describes the test procedures for conducting frontal impact restraint tests for heavy truck applications. Its purpose is to establish recommended test procedures that will standardize restraint system testing for heavy trucks. Descriptions of the test set-up, test instrumentation, photographic/video coverage, and the test fixtures are included.

Truck Crashworthiness Committee

Fuel Tank Dynamic Strain Measurement Using Computer Vision Analysis

2020-01-09244/14/2020

Stress and strain measurement of high density polyethylene (HDPE) fuel tanks under dynamic loading is challenging. Motion tracking combined with computer vision was employed to evaluate the strain in an HDPE fuel tank being dynamically loaded with a crash pulse. Traditional testing methods such as strain gages are limited to the small strain elastic region and HDPE testing may exceed the range of the strain gage. In addition, strain gages are limited to a localized area and are not able to measure the deformation and strain across a discontinuity such as a pinch seam. Other methods such as shape tape may not have the response time needed for a dynamic event. Motion tracking data analysis was performed by tracking the motion of specified points on a fuel tank during a dynamic test. An HDPE fuel tank was mounted to a vehicle section and a sled test was performed using a Seattle sled to simulate a high deltaV crash. Multiple target markers were placed on the fuel tank. The motion of these

Fleming, Mark, Krishnaswami, Ram, Nakamoto, Kunihiro

A Human Body Model Study on Restraints for Side-Facing Occupants in Frontal Crashes of an Automated Vehicle

2020-01-09804/14/2020

This study was to investigate kinematics and responses of side-facing seated occupants in frontal crashes of an automated minivan using Global Human Body Models Consortium (GHBMC) simplified occupant models (50th%ile male and 5th%ile female), and to develop new restraint concepts to protect the occupants. The latest GHBMC M50-OS and F05-OS models (version 2.2) were further validated with Postmortem Human Subject (PMHS) side sled tests [7]. Robustness and biofidelity of the GHBMC human models, especially for the pelvis region, were enhanced. Using the update M50-OS and F05-OS models, we evaluated the body kinematics and injury measures of the side-facing seated occupants in frontal crashes of a minivan at severities ranging from 24 kph (15 mph) to 56 kph (35 mph). Three restraint configurations were studied: 1) no restraint; 2) lap belt only; 3) lap and head/torso restraints. Parametric studies on the restraint configurations and design parameters of each restraint were performed to

Zhao, Jay Zhijian, Katagiri, Maika, Decker, William, Lee, Sungwoo, Gayzik, Francis

The Effects of Small Seat Swiveling Angles on Occupant Responses during a Frontal Impact

2020-01-05714/14/2020

In highly automated vehicles (HAVs), new seat configurations may be desirable to allow occupants to perform new activities. One of the current HAV concepts is the swiveled seat layout, which might facilitate communication between occupants. The main objective of this study was to investigate the effects of seat swiveling angles on occupant kinematics and injury risk predicted by a Human Body Model (HBM) during a frontal impact. A detailed 50th percentile male HBM (GHBMC M50-O) was subjected to two frontal crash pulses in a sled setup. The model was positioned on a semi-rigid seat and restrained using a pre-inflated airbag and a three-point seatbelt. Simulations included four seat swiveling angles (0, -10, -20, and -30 degrees), three occupant positions (Sedan driver, large VAN driver or Laptop user), two airbag initial locations (nominal or matching the head Y location), and the inclusion of lateral supports on the seat pan. The effects of the seat swiveling angle were similar for all

Grébonval, Cyrille, Trosseille, Xavier, Petit, Philippe, Wang, Xuguang, Beillas, Philippe

Frontal Crash Worthiness Performance of Bi-Tubular Corrugated Conical: Structures under Axial Loads at Low Velocity

2020-01-09834/14/2020

Vehicle collisions are a major concern in the modern automotive industry. To ensure the passenger safety, major focus has been given on energy absorption pattern on the crumple zone during collision, which lead to the implementation of new design of the crash box for low speed collision. The main aim of this research is optimization of the conical shaped structure based on its mean diameter, graded thickness and semi apical angle. Further, to decrease initial peak load of the conical crash box, corrugations are integrated on structure and optimized based on different parameters, such as number of corrugations, pattern of corrugation relative to both tubes and amplitude of corrugation. The concept of bi-tubular structure is proposed to improve both specific energy absorption and initial peak load during crash event. A finite element model is created to perform parametric study on corrugated conical tube based on axial load conditions at low velocity. Optimization to maximize total

Porwal, Akash, Tripathi, Abhishek, Krishnasamy, Prabu

Update on Second-Row Children Responses in Rear and Frontal Crashes with a Focus on the Potential Effect of Stiffening Front Seat Structures

2020-01-12154/14/2020

NHTSA has recently been petitioned to address the protection of second-row children in rear crashes due front seatback performance. The protection of children is important. However, it is more complex than assessing front seat performance in rear impacts. Viano, Parenteau (2008 [1]) analyzed cases of serious-to-fatally injured (MAIS 3+F) children up to 7 years old in the second row in rear impacts involving 1990+ model year vehicles using 1997-2005 NASS-CDS. They observed that intrusion was an important factor pushing the child forward into the back of the front seat, B-pillar or other front structure. To help assess whether stiffening the front seats would be beneficial for second-row child safety, the 2008 study was updated using more recent data and model year vehicles. In the present study, 1997-2015 NASS-CDS data were analyzed for serious-to-fatally (MAIS 3+F) injured 0- to 7-year old children in the second row with 1994+ model year vehicles. First, the data were analyzed to

Parenteau, Chantal, Viano, David

Automated Driving System Data Logger

J3197_202004 (Historical)

4/11/2020

This recommended practice provides common data output formats and definitions for a variety of data elements that may be useful for analyzing the performance of automated driving system (ADS) during an event that meets the trigger threshold criteria specified in this document. The document is intended to govern data element definitions, to provide a minimum data element set, and to specify a common ADS data logger record format as applicable for motor vehicle applications. The data elements defined in this document are unique to Levels 3, 4, or 5 ADS features, as defined by SAE J3016, and provide additional background of the events leading up to a crash or crash-like event. The data from sensors such as camera(s), LiDAR(s) etc. will provide information in the absence of a human driver. The data included in the ADS data logger is expected to be used in conjunction with the SAE J1698 EDR record and traditional accident reconstruction analysis. The event data recorder (EDR) and ADS data

Event Data Recorder Committee