| Summary: | 碩士 === 大葉大學 === 機械工程研究所碩士班 === 93 === To effectively and efficiently reduce traffic accident injuries, manufacturers now incorporate a wide range of safety devices and features into their vehicles. Evaluating the effectiveness of these protective devices involves investigating the dynamic response of the human body in a traffic accident situation. The information provided by such investigations enables vehicle manufacturers to modify their designs appropriately in order to enhance the occupant’s safety. Experimental testing is a commonly employed technique for evaluating the occupant protection capability of a particular vehicle. The experimental method can be further divided into real car crash test and sled test. The sled test has been demonstrated to be highly repeatable, reproducible, durable, and serviceable test devices. Recently, rapid advances in computer technology have enabled applied mathematicians, engineers and scientists to achieve significant progress in solving previously intractable problems. Numerical simulations of sled testing provide a valuable tool for automotive engineers. However, to build an exact finite element model is the most important work of numerical analysis for simulating the experiments. The purpose of research is to develop and validate an exact finite element model of sled test system. The injury of occupant in collisions can be effectively analyzed. In simulating the sled testing, a finite element model of the Hybrid Ⅲ 50% crash test dummy was developed and validated. Moreover, the parameter setting in the finite element sled model was determined by the experiments. The parameters include the material of seatback and cushion, elevator of seat machine, percent elongation of seatbelt and tensile strength of retractor. The finite element model of dummy and sled system was integrated in the numerical sled testing. The reasonable accuracy of the model makes it useful for crashworthiness simulation. To confirm the accuracy of the proposed numerical model, the current results are compared with those obtained from experimental tests. The results indicate that the numerical sled model proposed in this study has considerable potential for evaluating a vehicle’s crash safety performance and guiding the future development of safety technologies.
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