装载机是我们经常用到的一种工程机械，广泛用于建设工程的大型施工机械，它主要用于铲装土壤、砂石、石灰、煤炭等散状物料，也可对矿石、硬土等作轻度铲挖作业。装载机在运行的时候会发出很大的噪声，那么装载机为什么会发出如此大的噪声呢？

1、发动机噪声
发动机的振动是装载机噪音的最大来源，一般来说，如果能够有效地降低柴油机的排气噪声，就能大幅度地降低装载机的总噪声级。
The vibration of the engine is the largest source of noise in the loader, in general, can be effectively reduced if the diesel engine exhaust noise, can significantly reduce the overall noise level of the loader.
2、机械噪声
在发动机中，曲轴、飞轮、皮带轮等转动部件中的任何一个都会形成振动力，由于这个振动力与部件的不平衡量成正比，与其每分钟转速的平方成正比，当转速增加时，振动也被急剧放大，所以转动部件之间的平衡量最好小一些。
In the engine, any one crankshaft, flywheel pulley rotating member are formed in the vibration force, vibration due to the unbalance is proportional to the force component proportional to the square of its rotational speed per minute, when the speed increases, the vibration is also rapid amplification, so that rotation of the balance between the components is preferably smaller.
3、气体噪声
排气噪声的定义通常指的是排气系统辐射出来的总的噪声，包括管壁和消音器壁的辐射噪声以及尾管出口的气动辐射噪声，若将排气系统的管壁和消音器壁假设为刚性的，则排气噪声指的是仅气体动力性噪声。
Definition of exhaust noise of the exhaust system usually refers to the total radiated noise, and the muffler wall includes a radiation noise, and the wall of the pneumatic tube outlet end of the radiation noise, the wall and the wall of the muffler exhaust system If assumed to be rigid, the exhaust noise refers only aerodynamic noise.
4、燃烧噪声
柴油机工作时燃烧室在极短时间内发生高温高压的燃烧，急速地释放出能量。这种急剧的压力升高激发起发动机结构振动，从而辐射出噪声。
Diesel engine combustion chamber at high temperature and pressure occurs very short period of combustion, the rapid release of energy. This sharp rise in pressure to stimulate the engine structural vibration, which radiates noise.