高速对撞冲击试验机弹射装置动态特性研究

Study on Dynamic Characteristics of Ejection Device of High Speed Impact Testing Machines

为了增强舰船及其精密设备的抗冲击能力,提升冲击试验机的检测能力,提出一种新型高速对撞冲击试验机系统实施方案,介绍新型高速对撞冲击试验机的工作机理,建立弹射装置数学模型,应用液压仿真软件对液压弹射装置进行仿真计算,对试验台与冲击台碰撞过程进行动态特性研究。结果表明,该液压弹射装置通过改变开启蓄能器氮气瓶组数量和调节蓄能压力改变冲击台碰撞时的速度,与从上方下落的试验台相撞时可以获得比较理想可控的加速度脉冲,满足冲击试验机的设计要求。

In order to enhance the impact resistance of ship and its precision equipment and to enhance the maximum detection ability of traditional impact testing machine,a new implementation scheme of high-speed impact testing system was proposed.This paper introduces the working mechanism of a new high speed impact test machine,establishes the mathematical model of the ejection device,and uses hydraulic simulation software to simulate the hydraulic ejection device,and studies the dynamic characteristics of the collision process between the test bed and the impact table.The results show that the hydraulic ejection device can change the speed of impact platform by changing the number of nitrogen cylinders opened by accumulator and adjusting the energy storage pressure,and can obtain ideal and controllable acceleration pulse when it collides with the test platform falling down,which meets the design requirements of impact testing machine.