具有液压系统的机器,其噪音强度是随液压设备的工作速度、压力、容量和能量/重量比值的不断增长而递增的。图1所示是一个典型液压机的狭频波。图上的一些波峯代表许多单频音,噪音主要就是由于这些单频音组合而产生的。压力泵抽动频率是轴频与挤压元件件数的乘积。当图线上较高的波峯是在抽动频率的谐波上,这些波峯代表由于抽动机构本身而产生的声能。用没有波峯的图线表示的噪音是宽频噪音——本质上是紊乱的,一般地是由于气蚀现象,涡流或冲击而产生的。阀门处通常由于不利的流动条件,因而产 Machines with a hydraulic system whose noise intensity is increasing with the working speed, pressure, capacity and energy / weight ratio of the hydraulic equipment. Figure 1 shows the narrow-band wave of a typical hydraulic press. Some of the peaks on the graph represent many monophonic sounds, mainly due to the combination of these monophonic sounds. Pressure Pump Tension Frequency is the product of the shaft frequency and the number of compression elements. When the higher peaks on the graph line are at harmonics of the twitch frequency, these peaks represent the acoustic energy due to the twitching mechanism itself. The noise represented by the graph with no peaks is broadband noise - intrinsically disordered, typically due to cavitation, vortices or shocks. The valve is usually produced due to adverse flow conditions