Improvement of Rotational Range of Trunk in THUMS, for Application to Crash Safety Evaluations in Diverse Occupant Posture

Yoshiki Takahira･Yojiro Iizuka･Hiroshi Miyazaki･Shigeki Hayashi･Hiroaki Imai･Yuji Nakane (Toyota Motor)

Autonomous driving could increase comfort inside a cabin, potentially leading to a diversification of occupant postures. The objective of this study is to improve a rotational range of the trunk in a human body model “THUMS” with the perspective of crash safety evaluations for various postures. The adjustment of the paths of muscles around thoracolumbar helped improve the range of rotation. The result indicated the potential applicability of THUMS for evaluating a diversity of posture in a crash.

Improving Human Body Model Kinematic Fidelity in Far Side Impact using THUMS

Yojiro Iizuka･Hiroshi Miyazaki･Yoshiki Takahira･Shigeki Hayashi･Hiroaki Imai･Yuji Nakane (Toyota Motor)

The use of human body models will expand in the future in virtual testing, which is being introduced in car crash safety evaluations. In view of its application, this research aimed to improve the fidelity of head kinematics in far side impact tests using the human body model “THUMS”. By modifying the joint stiffness, the fidelity of the head kinematics was improved, demonstrating the possibility of applying the THUMS model to virtual testing.

Pelvic Rotation of THOR and Hybrid III Dummies in Frontal Impact

Toshiharu Azuma･Yuqing Zhao･Koji Mizuno (Nagoya University)･Kei Nagasaka･Takahiro Suzuki･Idemitsu Masuda (Suzuki Motor)

Finite element simulations of frontal impact sled tests were conducted on crash test dummies THOR (50M, 5F) and Hybrid III (50M, 5F). All moments around the center of gravity acting on the pelvis were obtained. The time histories of these moments were analyzed to investigate the influence of the shapes of the ilium, ischium, and coccyx on pelvis rotation.

Two-dimensional Degenerated Model of Rider on Motorcycle Crash

Kazunori Maehara･Masashi Saito･Yoshiharu Wada･Takashi Sato･Takashi Saso･Masayoshi Okamoto (Honda R&D)･Terumasa Narukawa (Saitama University)

To understand the phenomenon of a rider's whole-body behavior during a collision between a motorcycle and a four-wheel vehicle, a two-dimensional degenerate model was created. The model consisted of five rigid bodies (head, helmet, upper body, sternum, and lower body), and knee position was constrained by a pivot that moves back and forth. Comparison with a full-scale crash test showed similar results for head displacement and chest deflection.

Improvement Accuracy of Chest Injury Prediction for Accommodate a Variety of Occupants

Ikufumi Matsuba･Toshimitsu Negishi･Shigeki Hayashi･Hiroaki Imai･Yuji Nakane (Toyota Motor)

Introduction of virtual testing is accelerating in many new car assessment programs recently aiming to assess the various occupant and impact conditions. The purpose of this study is to develop seatbelt model for frontal impact with various occupants.
The characteristics of belt force for various occupant size was allocated with remained belt in the retractor. The friction between the seat belt and the occupant was also studied.

Static Anthropometric Measurements and Dynamic Changes during Driving in Pelvic Angles of Seated Motor Vehicle Occupants

Yoshihiko Tanaka･Yuqing Zhao･Koji Mizuno (Nagoya University)･Masahito Hitosugi･Misa Tojo (Shiga University of Medical Science)･Yutaka Nakajima (Autoliv)･Kentaro Ogawa･Ryota Ishigaki･Hiroki Matsuoka (Autoliv Japan)･Masatoshi Usui (NALTEC)

Using an accelerometer-based angle sensor and a three-dimensional measuring instrument to measure the seating posture of car occupants, trends in pelvic angles for small occupants were investigated.
The same angle sensor was used to examine the change in pelvic angle as the occupant's posture changes during driving

Development of CAE Methodology for Improving Accuracy of Reaction Force under Multiple Conditions of Driver Airbag Model

Hiroshi Morikawa･Yuki Uchiyama･Shoko Kobori･Michihiro Yamagishi (Nissan Motor)

CAE technical development was carried out because CAE analysis required to reproduce the airbag deployment behavior due to the specification change for increasing frontal airbag energy absorption. In modeling, factors influencing the airbag deployment behavior were identified and the characteristics measured in the test, then were incorporated into the model to improve prediction accuracy.