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中文摘要：
建立大直径气动潜孔锤的数学建模，通过动态过程数值模拟分析不同供气压力下气动潜孔锤结构参数对性能的影响。结果表明：过大的供气压力将使活塞超出设定行程，过小的供气压力无法形成较大的冲击频率。活塞低速时进气腔出现压力波动现象，这是由于进气量和容腔变化量相互作用引起的，可通过增大进气通道面积，减少压力波动。
英文摘要：
The large pneumatic DTH （down-the-hole） hammer was designed. The working principle was analyzed and the mathematical model was built. With programming and numerical simulation of the dynamic process in MATLAB, the simulation results were compared under different input air pressures. The results show that the overlarge input pressure made the piston exceed the range and too low input pressure was unable to generate a proper impact frequency. The phenomenon of pressure oscillation happening in the inlet chamber during the process of dynamic simulation is caused by interaction of flowing gas and changing chamber. The pressure oscillation can be decreased by means of increasing the flow area.
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