A Procedure to Design Automobile Bumper Thickness Based on Low-Speed Impact Regulation
| Autor: | Chi-HuaChang, 張琪華 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 A lightweight vehicle is a recent trend for automotive design due to energy shortage problems. The reduction of vehicle weight can be achieved by redesigning its parts. The bumper system is among them and is our main focus in this study. However, the safety of the vehicle can not be sacrificed and the modified bumper has to pass the current safety regulation. In this study, a design procedure is carried out for a bumper system which is fabricated by least materials and still capable of maintaining good crashworthiness to protect itself and occupants inside during a low-speed impact. The main goal of this study is to determine optimal thickness for a bumper of an on-market vehicle. Base on the thickness determination, the lightweight purpose can be achieved. At the starting procedure, the property of the bumper is obtained by standard material experiments. Based on the results, the regional stiffness test for the bumper was conducted based on finite element method. According to the empirical regional stiffness standard, the optimal thickness of the bumper in each region can be determined. In the end, the newly modified bumper has to be validated by the current safety regulation. In this study, the ECE R42 is used as safety regulation and the finite element method is applied to conduct the validation. In order to accelerate the design procedure, the interface codes between the commercial engineering software and the optimal program is written in the study. Finally, two vehicle models are utilized to validate the newly developed procedure in this study. The discrepancy between the original and modified designs is compared and discussed. The result show the procedure is capable of reducing the bumper weight without sacrificing its safety. Keywords: bumper, bending test, finite element method, low-speed impact |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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