一、问题的提出用现代声源分析技术对东方红—150拖拉机进行噪声源识别,查明了该机各主要部位的噪声强度,并按其发声大小顺序排列如下: 1、发动机进、排气噪声92.5dB(A)。(发动机1975rpm,扭矩54N.m,测距1m,测点对地高1.2m,其余同); 2、发动机曲柄连杆机构噪声90dB(A); 3、传动系噪声89.5dB(A)(四档,发动机2000rpm,空载) ; First, the problem raised Modern sound source analysis technology for the Dongfanghong -150 tractor noise source identification, the main parts of the aircraft to identify the noise intensity, and according to the size of the order of their pronunciation is as follows: 1, the engine intake and exhaust Noise 92.5dB (A). (Engine 1975rpm, torque 54N.m, distance measurement 1m, measuring point height 1.2m, the rest of the same); 2, engine crank and connecting rod mechanism noise 90dB (A); 3, Gear, engine 2000rpm, no load);