车辆噪声源主要来自发动机及其附件,其中排气噪声是主要的,一般在105分贝左右,最高的可达140分贝。因此,所有发动机均需在排气口安装消声器。目前我国在控制噪声方面已开始重视研究和试验,取得一定的效果,总的说来汽车行业较好,林业车辆由于起步晚,以及一部分错误的看法,差距较大。常州林机厂去年设计试制CJ—120吊架式集材机时,根据林区的要求,对发动机消声 The noise sources of vehicles mainly come from the engines and their accessories, of which the exhaust noise is the main one, generally about 105 decibels and the highest up to 140 decibels. Therefore, all engines require a muffler on the exhaust. At present, China has begun to attach importance to research and experimentation in noise control and achieved certain results. In general, the automotive industry is better. Forestry vehicles, due to their late start and partly erroneous views, have a large gap. Last year, Changzhou Forest Machine Factory prototype trial design CJ-120 hanger-type skidder, according to the requirements of the forest, the engine muffler