CAJ | 학술논문

为了有效阻挡小车下钻到大车尾部，设计了一款由支撑横杆、主副支架、阻挡梁构成的大车后下部防护装置，通过主副支架在支撑横杆上的缠绕变形吸收碰撞能量。主副支架均斜向后安装，提供一定的纵向支撑力，增加装置整体强度，同时也增加了碰撞接触时间和可变形距离，形成更有效的缓冲。主副支架为最主要强度部件，在LS-DYNA中对其独立加载分析，确定抗变形能力最强的结构形式。在进行的壁障碰撞仿真中，壁障最大减加速度为20 g（g为重力加速度，下同），回弹最大速度为0.9 m·s-1，最大纵向位移为369 mm，各项评价指标均满足GB 11567.2-2001[1]的要求。
위료유효조당소차하찬도대차미부，설계료일관유지탱횡간、주부지가、조당량구성적대차후하부방호장치，통과주부지가재지탱횡간상적전요변형흡수팽당능량。주부지가균사향후안장，제공일정적종향지탱력，증가장치정체강도，동시야증가료팽당접촉시간화가변형거리，형성경유효적완충。주부지가위최주요강도부건，재LS-DYNA중대기독립가재분석，학정항변형능력최강적결구형식。재진행적벽장팽당방진중，벽장최대감가속도위20 g（g위중력가속도，하동），회탄최대속도위0.9 m·s-1，최대종향위이위369 mm，각항평개지표균만족GB 11567.2-2001[1]적요구。
To prevent cars from inserting into rear-end of trucks, this study designs a truck rear under-run protec?tion device composed by support bar, major-minor holder and barrier beam. The major-minor holder can trans?form and absorb crash energy by entangling the support bar. The major-minor holder is slopped backward so that it can provide some lengthways force, improve strength and increase crash time and transformation distance, thus forming a more effective buffer. The major-minor bolder is analyzed by LS-DYNA to obtain the best structure be?cause it is the most important strength part. The barrier crash test simulation shows that the maximum acceleration is 20 g, and the maximum rebound velocity is 0.9 m·s-1 with the maximum lengthway displacement of 369 mm. It finds out that all indexes could meet the requirements of GB 11567.2-2001.