裝載機是我們經常用到的一種工程機械，廣泛用于建設工程的大型施工機械，它主要用于鏟裝土壤、砂石、石灰、煤炭等散狀物料，也可對礦石、硬土等作輕度鏟挖作業。裝載機在運行的時候會發出很大的噪聲，那么裝載機為什么會發出如此大的噪聲呢？

1、發動機噪聲
發動機的振動是裝載機噪音的最大來源，一般來說，如果能夠有效地降低柴油機的排氣噪聲，就能大幅度地降低裝載機的總噪聲級。
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、機械噪聲
在發動機中，曲軸、飛輪、皮帶輪等轉動部件中的任何一個都會形成振動力，由于這個振動力與部件的不平衡量成正比，與其每分鐘轉速的平方成正比，當轉速增加時，振動也被急劇放大，所以轉動部件之間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、氣體噪聲
排氣噪聲的定義通常指的是排氣系統輻射出來的總的噪聲，包括管壁和消音器壁的輻射噪聲以及尾管出口的氣動輻射噪聲，若將排氣系統的管壁和消音器壁假設為剛性的，則排氣噪聲指的是僅氣體動力性噪聲。
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、燃燒噪聲
柴油機工作時燃燒室在極短時間內發生高溫高壓的燃燒，急速地釋放出能量。這種急劇的壓力升高激發起發動機結構振動，從而輻射出噪聲。
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.