1 噪声源与消声原理 从实际中得知,气动凿岩机的噪声主要来源于: (1)压缩空气进入凿岩机气缸工作,其高压废气通过排气口并以高速排入大气,使相对静止的空气产生紊乱的涡流——排气噪声; (2)活塞冲击钎尾、钎杆与岩石之间的撞击以及钎杆的共振而产生的冲击噪声; (3)凿岩机内部零件振动产生的机械噪声; 1 noise source and silencing principle From the actual situation, the noise of pneumatic rock driller comes mainly from: (1) Compressed air enters the rock drill cylinder and its high-pressure exhaust gas passes through the exhaust port and is discharged into the atmosphere at a high speed, so that relatively static air (2) Impulsive vortex-exhaust noise generated by the piston; (2) Impulse noise generated by the impact of the shank of the piston on the shank, the impact between the shank and the rock and the resonance of the shank; (3) Mechanical noise caused by vibration of the internal components of the rock drill;