| In recent years,with the car population rapid growth in China, car safety issues have become more and more prominent, however, road traffic crashes most focus on frontal crash. Commercial cars such as heavy trucks, vans and other commercial car cause them structural characteristics have shorter front buffer crumple zones. Once frontal crash happened, cars front part unit is easily damaged, drivers and passengers are also more likely to occurred casualty accidents. At present, In Chinese safety technology, active safety equipment and occupant protection systems filed, commercial cars significantly backward passenger cars, the commercial car's passive safety is also lack of enough attention, and commercial car's mandatory safety regulations still imperfect. In recent years, along with the requirement of speed and heavy duty is continuously rising in Chinese transportation, commercial car's passive safety issues is increasingly severe. Therefore, in order to improve the commercial car's passive safety and promote the healthy development of Chinese automotive industry and transport industry. It's timely and necessary to take the research about commercial car frontal crashworthiness improvement work.In this paper, based on a large number of domestic and international data and previous projects experience, that summarized a method to improve commercial car frontal crash energy absorption characteristics, through select the appropriate materials and structures to design different sections energy-absorbing components. Then use linear Finite Element method and referenced the actual accidents strength and national standards, take Computer Simulated experience axial load frontal crash to impact designed absorbed test piece. And discuss and analysis its crash compressive deformation and energy absorption characteristics. By research specimen's collision energy absorption efficiency and force transmission during crash to analysis designed energy absorption specimen whether meets the safety requirements of car crash. Under satisfied the crash security and stability requirements, among the different sections choose energy absorption specimens in order to have a good energy absorbing property.Based on the above design, this paper focus on the issue that energy absorption specimens lack of absorption capacity ability. This article committed to improve the energy absorption deformation correspond zone, and design a series of multi-cellular thin-walled energy absorbing device. Based on this basis, this paper take further experiments and simulation study to choosing a multi-cellular thin wall specimen with the good energy absorption and crashworthiness. Simulation results show that the energy absorption crashworthiness component performance has been significantly improved.In order to achieve Energy absorption parts absorbing the impact energy as much as possible, Ensure the cars anti-crash energy absorption component can capable of produce a steady compressive deformation. This paper take Foam Aluminum as the buffer energy absorption filling material. Using finite element crash simulation method to analysis the deformation characteristics of Multi-cellular thin-walled filled by Foam Aluminum energy absorption specimen under axial compression impact process performance. Design a kind Energy absorption part with strong absorption capability and sustained compression deformation process: The Foam Aluminum-filled three cell thin-walled metal pipe. Passed the final verifying experiment, provide a case and reference for the front crash safety automotive design and improvement in the future.Finally, summarized the research and design work, and analyze of some worth improve or design areas in energy absorption at front crash buffer in the present system,and describes the research direction of the future bumper part. |
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