发动机噪声源识别对于制定发动机降噪措施十分重要 ,而像油底壳、气门罩、前齿轮室盖等罩壳类零件通常是发动机的主要噪声源 .本文用铅覆盖法和表面振动测量法对一台六缸工程机械用柴油机进行了表面噪声源识别的研究 ,得到了罩壳类零件按噪声能量大小的排列顺序 ,文中首先在半消声条件下利用铅覆盖技术测量了这些罩壳类零件的声功率 ,然后又研究了它们的振动特性 ,并通过表面振动速度的面积时间均方值预测了其声功率 .两种方法的测量结果吻合较好 ,说明了它们在工程领域应用的有效性 Engine noise source identification is very important for making engine noise reduction measures, while shell parts such as oil pan, valve cover and front gear chamber cover are usually the main noise sources of the engine.In this paper, lead coverage and surface vibration measurements A six-cylinder diesel engine engineering machinery surface noise source identification of the study, the shell parts by the noise energy size of the order of arrangement, the first article in the semi-anechoic conditions using lead covering technology to measure the shell parts And then their vibrational characteristics were also studied.The acoustic power was predicted by the mean square value of the area surface vibration velocity.The results of the two methods agree well with each other and the validity of their application in engineering field