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    孙驰, 王家顺, 安琦. 液压缓冲滑车碰撞试验力学建模及数值分析[J]. 华东理工大学学报(自然科学版), 2019, 45(1): 163-170. DOI: 10.14135/j.cnki.1006-3080.20180117001
    引用本文: 孙驰, 王家顺, 安琦. 液压缓冲滑车碰撞试验力学建模及数值分析[J]. 华东理工大学学报(自然科学版), 2019, 45(1): 163-170. DOI: 10.14135/j.cnki.1006-3080.20180117001
    SUN Chi, WANG Jiashun, AN Qi. Mechanical Modeling and Numerical Analysis on the Vehicle Collision Test with Hydraulic Buffer[J]. Journal of East China University of Science and Technology, 2019, 45(1): 163-170. DOI: 10.14135/j.cnki.1006-3080.20180117001
    Citation: SUN Chi, WANG Jiashun, AN Qi. Mechanical Modeling and Numerical Analysis on the Vehicle Collision Test with Hydraulic Buffer[J]. Journal of East China University of Science and Technology, 2019, 45(1): 163-170. DOI: 10.14135/j.cnki.1006-3080.20180117001

    液压缓冲滑车碰撞试验力学建模及数值分析

    Mechanical Modeling and Numerical Analysis on the Vehicle Collision Test with Hydraulic Buffer

    • 摘要: 以液压缓冲滑车碰撞试验装置为研究对象,应用有关力学和流体力学理论,对碰撞过程中滑车和液压缸活塞的受力、运动以及液压缸的压力变化进行了分析。根据能量守恒原理,构建了滑车碰撞过程的力学模型和能量守恒模型,采用离散求解方法,对所建立的模型实现了数值求解。针对某一具体算例,深入研究了滑车质量、初始碰撞速度、阻尼孔直径等参数对碰撞过程的性能影响,得到了一系列规律性的曲线。结果表明:滑车的加速度随初始碰撞速度、阻尼孔长度增大而增大,随滑车质量、阻尼孔间距的增大而减小;碰撞过程中,滑车质量越大,滑车速度降低得越慢;阻尼孔长度越大、阻尼孔直径越小,速度变化得越快;滑车位移随滑车质量、初始碰撞速度、阻尼孔间距、阻尼孔直径的增大而增大,随阻尼孔长度的增大而减小。

       

      Abstract: The vehicle safety test includes two types of real vehicle collision and sled collision test (car simulation collision). The expensive actual vehicle crash test has a long preparation cycle and poor waveform reproducibility which is generally used only for product certification. The sled crash test can obtain the test results similar to the actual vehicle collision, and it is therefore widely used. In recent years, hydraulic bumper crash has become an important research direction. In this work, the vehicle collision test device of hydraulic buff is taken as the research target. By using the mechanics and fluid mechanics theory, the force and movement of the sled and the hydraulic cylinder piston and hydraulic cylinder pressure changes are analyzed. According to the principle of conservation of energy, the mechanical model and the energy conservation model of the sled collision process are established. By using discrete solution method, the established model is solved numerically. For a specific example, the influences of the parameters such as mass of the sled, the initial collision speed and the diameter of the damp hole on the collision process are thoroughly studied and a series of regular curves are obtained. The acceleration of the sled increases with the initial collision speed and the length of the damp hole, but it decreases with the mass of the sled and the distance between the damping holes. During the collision process, the more the mass of sled is, the slower its speed gets; the longer the length of the damping hole is and the smaller the diameter of the damping hole is, the faster the speed changes. The sled displacement increases with the mass of the sled, the initial collision speed, the distance between the damp hole and the diameter of the damp hole, while it decreases with the length of the damp hole.

       

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