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• W3143917897 abstract "In this study, the sensitivity to different seating positions of the THOR-NT and the Hybrid III in sled testing were evaluated. In the tests, the THOR-NT or the Hybrid III was installed on the driver seat of a vehicle body fixed on the sled, and a frontal impact of 15.6 m/s (56 km/h) was given to the sled. Dummy installation was subject to FMVSS 208 and UMTRI seating procedures. Furthermore, based on the FMVSS 208 procedure, the seat slide was adjusted forward 30 mm (MP-30). In testing of the three seating positions of the THOR-NT, different responses in the head acceleration was shown. The head accelerations in FMVSS 208 and UMTRI exhibited a sharp high wave of about 110 ms, but that in the MP-30 did not exhibit such a wave. Applying the dummy injury values to provisional injury assessment reference values (IARVs) for THOR used in the research of the NHTSA, kinematic rotational brain injury criterion (BRIC) of the MP-30 was lower than FMVSS 208 and UMTRI. For the acetabulum force, it was large, in the order of the UMTRI, FMVSS 208, and MP-30. For inversion/eversion of the right ankle of the accelerator pedal side, it showed large angles, in the order of the FMVSS 208, MP-30, and UMTRI. Other injury values of the ankles showed large angles, in the order of the UMTRI, FMVSS 208, and MP-30. The difference in the responses to the different seating positions was mainly observed in the head acceleration and lower extremity force responses for both the THOR-NT and the Hybrid III. However, comparing responses of the THOR-NT and the Hybrid III with the same conditions, the upper body of the THOR-NT moved forward more, compared to the Hybrid III, and the torsion about the z-axis was also larger than the Hybrid III. As a result, the head acceleration of the THOR-NT and the Hybrid III exhibited different responses. INTRODUCTION Currently, though the Hybrid III frontal crash test dummy is used worldwide, there is a neeed for a more advanced dummy with more biofidelity and higher measurement performance to more sensitively evaluate the advanced restraint devices, so as to further improve safety performance. Under these circumstances, in 2001 an advanced frontal crash test dummy THOR (Test Device for Human Occupant Restraint) alpha version was developed in the United States [1]. In 2005, the THOR-NT version which exhibited improvement in durability and usability from the THOR-alpha was released [2]. In order to further improve the biofidelity and measurement performance of the THOR-NT, development of a new version THOR (THOR Mod Kit), under collaboration of NHTSA, EU THORAX, and other organizations came in progress [3]. In this study, it evaluates the sensitivity to different seating positions of the THOR-NT and the Hybrid III in sled testing. The objective is to obtain base data which is a comparative target for evaluating the THOR Mod Kit in the near future. Yaguchi 2 SLED TESTING Test Condition The THOR-NT or the Hybrid III was installed on the driver seat of a vehicle body fixed on the sled, and a frontal impact of 56 km/h was given to the sled. The vehicle body used in the sled tests was a four-door sedan passenger car (Figure 1). For the restraint system, the air bag, and a seatbelt with force limiter and a double pretensioner at the retractor and outer lap belt anchorage were used in this series of tests. Figure 2 shows the acceleration and the velocity curves of the sled. Figure 1. Vehicle body of four-door sedan passenger car -10 0 10 20 30 40 50 60 -50 0 50 100 150 200 250 300 0 20 40 60 80 100 120 Ve lo ci ty (k m /h ) Ac ce le ra tio n (m /s ec 2 ) Time (msec) Figure 2. Sled pulse (acceleration and velocity) Measurements For the electrical measurements, the accelerations, deflections and forces of the dummies and the acceleration of the sled were recorded by a data acquisition system, and they were filtered in compliance to SAE J211 [4]. The detailed information of the instrumentation of the THOR-NT and Hybrid III is shown in the Appendix (Table A1). For the photogrammetry, two high-speed video cameras were used to take the kinematics of the dummy during the impact. Kinematics of the dummies were observed as follows: The motions of the markers attached to some parts on the dummy were recorded by the video camera, then these were converted into the displacements using a video analyzer. Dummy Positioning Dummy installation was subject to the following three seating procedures: (1) FMVSS 208; specified for Hybrid III [5], (2) UMTRI (University of Michigan Transportation Research Institute); the seat position depends on the driver occupant size, dimensions of steering wheel and accelerator pedal, and seat adjustment range [6], (3) MP-30; based on FMVSS 208 procedure, the seat slide was adjusted forward 30 mm. For FMVSS 208, the seat slide is in the mid position, and the seat lifter is in the lowest position. For UMTRI, the seat slide is rearward 49 mm relative to FMVSS 208, and the seat lifter is upward 14 mm. For MP-30, it is as described above. Figures 3 and 4 show the comparison of the positioning in the X-Z coordinate system for the THOR-NT and the Hybrid III in each seating position according to three seating procedures. The x-axis is posterior and anterior direction, and the z-axis is superior and inferior direction. Figures 5 and 6 show the posture and the clearance between the instrumentpanel and each body region, for the THOR-NT and the Hybrid III in each seating position. For both the dummies, depending on the difference in the seat position, dummy positioning differed in three conditions. Kinematic Responses Figures 7 and 8 illustrate the trajectories of the markers on each body region for the THOR-NT and the Hybrid III in three seating positions. Time of trajectories shown in these figures is when the dummies' head has reached to the maximum displacement with the x-direction. Table 1 shows the maximum displacement of each body region. For both the dummies, the trajectory in three seating positions was mostly similar. However, in reviewing the details, the forward movement of the upper body was larger as the dummy position was more in the rear position (UMTRI > 208 > MP-30) (see comparison of the values in the red-bordered boxes in Table 1). For the ankle, the Yaguchi 3 0 100 200 300 400 500 600 700 800 90" @default.
• W3143917897 created "2021-04-13" @default.
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• W3143917897 date "2013-01-01" @default.
• W3143917897 modified "2023-09-27" @default.
• W3143917897 title "SENSITIVITY TO DIFFERENT SEATING POSITIONS OF THOR-NT AND HYBRID III IN SLED TESTING" @default.
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