反向扩孔气动冲击器活塞结构优化设计研究  

The Optimization Design Study of the Piston Structure of the Reverse Counterboring Pneumatic Impactor

作　　者：徐绍军[1] 赵宏强[1] 徐海良[1] 郑义[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《计算机仿真》2017年第2期278-284,共7页Computer Simulation

基　　金：国家自然科学基金资助项目(51375499)

摘　　要：研究反向扩孔气动冲击器活塞结构与工作性能的关系,对活塞各结构参数进行优化设计。为了解决上述问题,从反向扩孔气动冲击器工作原理出发,运用活塞运动微分方程、热力学能量守恒定律、定常绝能流动能量方程、波动理论等建立活塞运动数学模型,利用MATLAB数学软件对其进行数值求解,分析活塞结构参数对反向扩孔气动冲击器性能的影响,并进一步运用优化设计理论,对活塞各结构参数进行优化设计。仿真结果表明:冲旋钻头所获得的冲击能随着活塞质量和活塞内径的增大而减小;随活塞直径,阀孔直径和阀孔到活塞前端距离的增大而增大。通过对正交试验结果的分析,得到了活塞结构参数的最佳组合。The relationship between piston structure and working performance of the reverse counterboring pneumatic impactor is researched to select the optimal piston structure. A movement mathematical model of the piston was built by applying piston motion differential equation, energy conservation law of thermodynamics, steady flow energy equation without energy exchange and wave theory based on the working principles of the impactor. The mathematical model was then solved with the help of MATLAB,thus enabling the further analyze of the influence of piston structure parameters on the impactor performance. Furthermore, the optimization design theory was used to select the optimal piston structure. Simulation result shows that impact energy obtained by the percussion - rotary bit increases with the increase of quality and inner diameter of the piston, and decreases with the increases of diameter of the piston, the diameter of the valve hole and the distance between the valve hole and the front end of the piston. The best combination of the piston structural parameters was obtained through the analysis of the result of the orthogonal test.

关 键 词：反向扩孔气动冲击器 性能 数学模型 结构 优化 

分 类 号：TH47[机械工程—机械制造及自动化]