The influence of front seat backrest angle difference on whiplash test evaluation

With the official implementation of CNCAP2024 version, the backrest angle of the front row whip has been changed from a fixed 25° to the manufacturer's design angle, improving the flexibility of seat development by the host factory and meeting the comfort needs of a wider range of drivers. The different forms of differences in the backrest angles of the front seats will have an impact on human injury during low-speed rear end collisions. In order to study the influence of different backrest angles of the front seats on the evaluation results of the whipping test, according to CNCAP requirements, two whipping tests were conducted using different backrest angles of the front seats to analyze the differences in dummy injury caused by differences in backrest angles of the front seats. The research results indicate that in this whipping test, the pulse width and variation trend of the injury curve of the dummy are basically the same for different backrest angles of the same seat. However, different backrest angles indirectly affect the distance of the head back gap, resulting in changes in the angle of contact between the A-side of the headrest and the dummy's head and backrest, which can intuitively affect the changes in the neck force of the dummy and ultimately affect the evaluation of the whipping test. By analyzing the evaluation of the whipping test, the rationality of changing the backrest angle to the design angle in CNCAP2024 was verified. The backrest angle in the front row whipping was changed from a fixed 25° to the manufacturer's design angle, which took into account both the comfort of the driver and the accuracy of the whipping test evaluation.