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    王家顺, 李正美, 安琦. 汽车碰撞试验弹射过程的力学建模与运动分析[J]. 华东理工大学学报(自然科学版), 2018, (3): 431-438. DOI: 10.14135/j.cnki.1006-3080.20170524001
    引用本文: 王家顺, 李正美, 安琦. 汽车碰撞试验弹射过程的力学建模与运动分析[J]. 华东理工大学学报(自然科学版), 2018, (3): 431-438. DOI: 10.14135/j.cnki.1006-3080.20170524001
    WANG Jia-shun, LI Zheng-mei, AN Qi. Mechanical Modeling and Motion Analysis of Catapult Process of Vehicle Collision Test[J]. Journal of East China University of Science and Technology, 2018, (3): 431-438. DOI: 10.14135/j.cnki.1006-3080.20170524001
    Citation: WANG Jia-shun, LI Zheng-mei, AN Qi. Mechanical Modeling and Motion Analysis of Catapult Process of Vehicle Collision Test[J]. Journal of East China University of Science and Technology, 2018, (3): 431-438. DOI: 10.14135/j.cnki.1006-3080.20170524001

    汽车碰撞试验弹射过程的力学建模与运动分析

    Mechanical Modeling and Motion Analysis of Catapult Process of Vehicle Collision Test

    • 摘要: 基于弹性绳弹射加速的汽车碰撞试验台,分析了弹射过程中弹性绳的变形和滑车的运动,建立了相关的力学模型,并提出一种数值离散方法求解该模型。结合一个具体的算例,研究了初始弹射距离、滑车质量、弹性绳数量以及弹性绳弹性系数对滑车运动的影响,结果表明:弹射过程中,滑车所受合力随初始弹射距离、弹性绳数量、弹性绳弹性系数的增加而增大,滑车质量对合力的影响较小;滑车的初始加速度随初始弹射距离、弹性绳数量、弹性绳弹性系数的增加而增大,随滑车质量的增大而减小;初始弹射距离越大,滑车质量越小,弹性绳数量越多,弹性绳弹性系数越大,滑车的速度、位移变化越快。

       

      Abstract: Vehicle collision test is one of the tests that must be carried out for the safety of vehicles. Generally, elastic rope catapult system is used to increase the sled to a standard required speed, and then the sled collide with the deceleration device to reproduce the actual vehicle collision. However, the catapult process is affected by many factors such as the number and the elasticity coefficient of the elastic rope, the quality of the sled. In order to command the catapult ability of the test bench, precisely control the catapult speed, the deformation of the elastic rope and the movement of the sled during the catapult process were analyzed based on the vehicle collision test with the elastic rope catapult. The relevant mechanical model is established and a numerical discrete method is proposed to solve the model numerically in this paper. With a specific example, the influences of the initial catapult distance, the quality of the sled, the number and the elasticity coefficient of the elastic rope on the movement of the sled are studied. The results show that the resultant force of the sled increases with the increase of the initial catapult distance, the number and elasticity coefficient of the elastic rope while the mass of the sled has little effect on the resultant force during the catapult process. The initial acceleration of the sled increases with the increase of the initial catapult distance, the number and the elasticity coefficient of the elastic rope decrease with the increase of the quality of the sled. The speed and displacement of the sled change quickly with the increase of the initial catapult distance. Such change also will be greater with the weight increase of the sled, with the increase of rope number and with the increase of elasticity coefficient of the rope.

       

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