Study on Vehicle Body Structure Deformation Modes in Frontal Crash
The response of collision velocity waveform to structure deformation in parts dynamic impact simulation was first analyzed in this paper, and a method of deriving structure deformation order by velocity waveform was then determined. By analyzing the relat
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Abstract The response of collision velocity waveform to structure deformation in parts dynamic impact simulation was first analyzed in this paper, and a method of deriving structure deformation order by velocity waveform was then determined. By analyzing the relationship between longitudinal rail structure deformation modes and collision velocity waveform in vehicle impact simulation, the reliability of a method of reversely deriving structure deformation modes through speed waveform was verified afterwards. Finally this method was applied in vehicle collision test and the deformation modes of longitudinal rail structure were derived accurately which could provide reference for optimizations of car body structure subsequently.
Keywords Frontal impact Sensor Velocity waveform Deformation behavior
1 Introduction The main influence factor of passenger response in the vehicle impact is the body acceleration. The faster vehicle acceleration is, the higher acceleration of passenger head becomes, and it is likely to result in higher HIC which reflects the passenger head injury criterion, and vice versa [1]. We can ensure the vehicle structural crashworthiness to a great extent by efficiently control of the engine F2012-F01-028 H. Liao (&) W. Liu (&) D. Zhou (&) C. Wang (&) F. Zhao Zhejiang Geely Automobile Research Institute CO., LTD, Hangzhou, China
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 197, DOI: 10.1007/978-3-642-33805-2_10, Ó Springer-Verlag Berlin Heidelberg 2013
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room deformation space [1]. For cars and light buses, the front longitudinal rail is the main energy absorber in the forepart of the body. Its deformation behavior and energy absorbing characteristics have a great influence on the acceleration or the force response during vehicle impact [2]. Therefore, during the performance development of vehicle safety, the injury of passengers is reduced by optimizing the acceleration pulse based on the management of engine compartment deformation. In the development of structure, conventional methods is optimizing the longitudinal rail according to the finite element simulation result, and then verify the effectiveness of optimization schemes through actual impact test. The crash simulation model after benchmarking can have results similar to the real car test, and it can show the whole process of the structure deformation easily. But in the actual crash test, there is no reliable method to research the deformation of vehicle body structure which is inside the sheet metal and exterior trim. It is hard to verdict if the unsatisfactory impact results are caused by the body structure deformation behavior just by referring to the post-test status. So it’s hard to infer the body structure deformation and to judge the consistency of simulation and real test accurately and effectively based on the information we get after the test. As a consequence, the paper tries to propose one method to rest
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