中量级强冲击试验机摆锤结构优化设计与冲击数值仿真

发布时间：2018-07-07 23:17

本文选题：冲击动力学 + 水下爆炸　；参考：《华中科技大学》2014年硕士论文

【摘要】：现代舰船对各类机电设备、精密仪器的依赖程度越来越高，而另一方面各类设备容易受冲击影响，尤其是受作战环境下的强冲击作用影响而失效，使舰船丧失作战能力。因此关注舰船设备的抗冲击能力以及在设备列装之前对其进行冲击试验是十分重要的工作。对设备进行抗冲击试验主要有三类方法：实船爆炸试验，虚拟冲击试验以及冲击试验机试验。鉴于各类方法的利弊与经济成本，目前较为流行的方法是对舰船设备进行冲击试验机试验。本文主要内容如下：首先简单介绍了课题的背景与意义，介绍了对舰船设备进行冲击试验的各类方法与发展趋势，对国内外冲击规范以及冲击试验设备的现状做了简单介绍。简要概述了冲击动力学基本理论以及水下爆炸的载荷特征。建立了冲击试验机的三维实体模型，基于刚体动力学模型与优化设计原理，建立了冲击试验机摆锤系统的优化设计模型，，求得了摆锤系统的最优尺寸。优化后的摆锤系统可提高试验机的性能，同时可有效降低冲击试验对摆锤转轴的损伤。利用ANSYS/LS-DYNA软件对冲击试验过程进行了数值仿真计算，得到了冲击接触面的作用力结果。此外，在不同的冲击速度及不同的波形器材质条件下对冲击试验进行仿真计算，对仿真结果进行了分析，得出了冲击速度以及波形发生器材料特性对冲击力波形的影响规律，对设计不同的冲击波形有一定的指导意义。文章最后对所做工作做了总结，并对后继工作做了简要展望。
[Abstract]:Modern warships rely more and more on various kinds of mechanical and electrical equipment and precision instruments. On the other hand, all kinds of equipments are vulnerable to impact, especially because of the strong impact in combat environment, which makes the warship lose its combat capability. Therefore, it is very important to pay attention to the shock resistance of ship equipment and to test the equipment before it is installed. There are three kinds of methods to test the equipment: explosion test, virtual impact test and impact test. In view of the advantages and disadvantages of various methods and economic costs, the more popular method is to test the ship equipment impact testing machine. The main contents of this paper are as follows: firstly, the background and significance of the subject are briefly introduced, and various methods and development trends of impact test for ship equipment are introduced. The impact code and the current situation of impact test equipment at home and abroad are briefly introduced. The basic theory of impact dynamics and the load characteristics of underwater explosion are briefly summarized. The three-dimensional solid model of impact testing machine is established. Based on the rigid body dynamics model and optimization design principle, the optimal design model of impact testing machine pendulum system is established, and the optimal size of pendulum system is obtained. The optimized pendulum system can improve the performance of the test machine and reduce the damage caused by impact test to the rotary shaft of the pendulum. The impact test process was simulated by ANSYS- LS-DYNA software, and the results of the impact contact force were obtained. In addition, the impact test is simulated and calculated under different impact speed and different waveform materials. The simulation results are analyzed, and the influence law of impact velocity and material characteristics of waveform generator on the impact wave is obtained. It has certain guiding significance for designing different shock wave shapes. Finally, the paper summarizes the work done, and makes a brief outlook for the follow-up work.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U674.703

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