Integrated into the development process of a chinese independent brand class sedan,optimization about occupant restraint system associated with dummy chest deceleration is studied.Based on this simulated vehicle decel...Integrated into the development process of a chinese independent brand class sedan,optimization about occupant restraint system associated with dummy chest deceleration is studied.Based on this simulated vehicle deceleration and the target vehicle′s chest deceleration,tipped equivalent square wave(TESW)is calculated by combining the average stiffness kof occupant restraint system and the average free flight time t*from the existant CNCAP(China new car assessment program)tested cars.After proposing modeling regulations of occupant restraint system and establishing mathematical dynamic modelling(MADYMO)for occupant restraint system of the target vehicle,four optimization design parameters namely vent area A,load limit L,seat belt extension ratio Band pretension force Fare selected by weighted injury criteria(WIC)rule and the first-order response surface method.The four parameters have been optimized by using orthogonal test design of four factors with five levels and the optimum combination A5L1B1F5 has been chosen by range and variance analyses.The results show that occupant restraint system performance has been optimized and improved,while meeting the chest deceleration calculation peak based on TESW.展开更多
Full frontal impact theory needs researching and exploring to satisfy the primary safety design of occupant restraint system,avoiding the increasingly "engineering"trend in order to develop and design safety...Full frontal impact theory needs researching and exploring to satisfy the primary safety design of occupant restraint system,avoiding the increasingly "engineering"trend in order to develop and design safety vehicle. After occupant restraint system is simulated by using linear elastic stiffness k,the occupant-vehicle frontal rigid barrier impact model is established. Dynamic equation of dummy chest coupling vehicle is built for full frontal impact based on ordinary vehicle deceleration by Hooke law,and the equation is solved by comparing coefficient and satisfying boundary qualifications. While relative vehicle characteristic parameters are kept unchanging,the actual vehicle deceleration is fitted to the simplified equivalent square wave( ESW),tipped equivalent square wave( TESW) and equivalent dual trapezoids wave( EDTW). Phase angle and amplitude A of dynamic equations based on ESW,TESW and EDTW are calculated and deduced. The results show that: the dynamic equation of dummy chest coupling vehicle can be well utilized to instruct the primary safety design of full frontal impact for objective vehicle to satisfy chest deceleration demands and the equation based on TESW is best for this design.展开更多
用第4代新版丰田人体模型THUMS(Total Human Model for Safety),分析研究了正面碰撞对于乘员人体模型的头部﹑胸部﹑腿部的伤害。基于国内某款运动型多功能车(SUV)零部件试验和正面碰撞试验,利用动态非线性显式有限元方法,建立了有限元...用第4代新版丰田人体模型THUMS(Total Human Model for Safety),分析研究了正面碰撞对于乘员人体模型的头部﹑胸部﹑腿部的伤害。基于国内某款运动型多功能车(SUV)零部件试验和正面碰撞试验,利用动态非线性显式有限元方法,建立了有限元约束系统模型,用Hyperworks软件作为前后处理器,用动力学分析软件LS-Dyna为求解器的仿真模式。结果表明:该款THUMS人体模型头骨最大压应力2.4 MPa,颅内压应力44 k Pa,头部无损伤风险;股骨﹑胫骨最大应变0.4%,左右十字韧带应变3.6%,腿部无损伤风险。上肋骨应变大于3%,胸部压缩量达到30 mm,造成胸部简明损伤等级三级(AIS3)的概率为30%。因此,该碰撞工况下最有可能受伤的部位是胸部。展开更多
基金supported by the National Science and Technology Support Program of China(2011BAG02B02)
文摘Integrated into the development process of a chinese independent brand class sedan,optimization about occupant restraint system associated with dummy chest deceleration is studied.Based on this simulated vehicle deceleration and the target vehicle′s chest deceleration,tipped equivalent square wave(TESW)is calculated by combining the average stiffness kof occupant restraint system and the average free flight time t*from the existant CNCAP(China new car assessment program)tested cars.After proposing modeling regulations of occupant restraint system and establishing mathematical dynamic modelling(MADYMO)for occupant restraint system of the target vehicle,four optimization design parameters namely vent area A,load limit L,seat belt extension ratio Band pretension force Fare selected by weighted injury criteria(WIC)rule and the first-order response surface method.The four parameters have been optimized by using orthogonal test design of four factors with five levels and the optimum combination A5L1B1F5 has been chosen by range and variance analyses.The results show that occupant restraint system performance has been optimized and improved,while meeting the chest deceleration calculation peak based on TESW.
基金Sponsored by the National Science and Technology Support Program of China(Grant No.2011BAG02B02)
文摘Full frontal impact theory needs researching and exploring to satisfy the primary safety design of occupant restraint system,avoiding the increasingly "engineering"trend in order to develop and design safety vehicle. After occupant restraint system is simulated by using linear elastic stiffness k,the occupant-vehicle frontal rigid barrier impact model is established. Dynamic equation of dummy chest coupling vehicle is built for full frontal impact based on ordinary vehicle deceleration by Hooke law,and the equation is solved by comparing coefficient and satisfying boundary qualifications. While relative vehicle characteristic parameters are kept unchanging,the actual vehicle deceleration is fitted to the simplified equivalent square wave( ESW),tipped equivalent square wave( TESW) and equivalent dual trapezoids wave( EDTW). Phase angle and amplitude A of dynamic equations based on ESW,TESW and EDTW are calculated and deduced. The results show that: the dynamic equation of dummy chest coupling vehicle can be well utilized to instruct the primary safety design of full frontal impact for objective vehicle to satisfy chest deceleration demands and the equation based on TESW is best for this design.
文摘用第4代新版丰田人体模型THUMS(Total Human Model for Safety),分析研究了正面碰撞对于乘员人体模型的头部﹑胸部﹑腿部的伤害。基于国内某款运动型多功能车(SUV)零部件试验和正面碰撞试验,利用动态非线性显式有限元方法,建立了有限元约束系统模型,用Hyperworks软件作为前后处理器,用动力学分析软件LS-Dyna为求解器的仿真模式。结果表明:该款THUMS人体模型头骨最大压应力2.4 MPa,颅内压应力44 k Pa,头部无损伤风险;股骨﹑胫骨最大应变0.4%,左右十字韧带应变3.6%,腿部无损伤风险。上肋骨应变大于3%,胸部压缩量达到30 mm,造成胸部简明损伤等级三级(AIS3)的概率为30%。因此,该碰撞工况下最有可能受伤的部位是胸部。
