噪声是紊乱、断续或统计上随机的振荡,是我们不需要的声音。机械噪声分: 1.空气动力性噪声。它是由气体流动或物体在气体中运动引起空气振动产生的,如风扇、排气噪声。2.机械性噪声。由机械零部件间发生碰撞、冲击和振动产生的。3.电磁噪声。由交变磁场对定子和转子作用,产生周期性交变力引起振动产生的。工程机械主要是前两种噪声。其噪声能量往往超过允许限度,危害很大:污染环 Noise is turbulent, intermittent or statistically random oscillations that we do not need. Mechanical noise points: 1. Aerodynamic noise. It is caused by gas flow or air movement caused by objects in the gas, such as fan, exhaust noise. 2. Mechanical noise. Produced by collisions, impacts and vibrations between mechanical components. 3. Electromagnetic noise. By the alternating magnetic field on the stator and rotor, resulting in periodic alternating force caused by vibration. Construction machinery is mainly the first two kinds of noise. Its noise energy often exceeds the allowable limit, endangering a lot: pollution ring