Structure Dynamic Optimal Study of the WW—2.5/1.0 Air Compressor Muffler

1　WW型空压机噪声源测试和频谱分析

ZHOU Xin-xiang
(Anshan Insitute of I & S Technolgy, Anshan 114002,China)

Abstract：An aerodynamic noise is confirmed to be the strongest one according to the test and analysis of the frequency spectrum of the noise from WW—2.5/1.0 Air Compressor from the consideration to the machine itself structure and characteristic. Noise initiative control of them can't be met so noise passive control must be used. At the air compresser inlet, impedance compound uffler is installed this uffler is got by the methed of the optimal It first defines target function, restraint function and design variable After thoroughly understanding of the dynamic characteristics of the structure, limited unit dynamic computing methed is used so that we can design noise elimination device w ith large noise elimination Perfect dynamic characteristics and reasonable structure quickly This method for design high effect and quality to provide reference thery data.
Key words：Dynamlic optimal Muffler Target function Restraint function Limited unit Dynamic Characteristics▲

　　选用WW—2.5/1.0无油空压机主要性能参数为：流量为2.5m³/min，压力1.0MPa；转速为6.15r/mim；功率为18.5kW；缸数为3缸单作用，驱动电机为YISOM—4，功率为18.5kW；电流为35.9(A)；转数为1470r/min；电压为380V；频率为50Hz。
　　空压机工作运转时，进口直接吸空，出口与管路相连，参照国家有关机器的测量规定，测点的水平距离为1m，距地面为1.5m，测点布置如图1，测试仪器有精密级声级计、倍频程滤波器、传声器及磁带记录仪、电荷放大器、信号处理机等。通过各测点数据看出，空压机进气口1、2点噪声最强烈见表1(表中仅列最强测点1的数据)同时，对噪声信号进行自功率谱分析处理，进口1点处的自功率谱如图2。

图1　测点布置

图2　1点噪声信 号处理自功率谱

表1　空压机噪声倍频程声压级(dB)与A声级(dB)