李秀山^1,2，丁保安^1,2，郭彬^1,2，张伟龙^1,2，曾超^1,2

（1.内燃机可靠性国家重点实验室，山东 潍坊 261061；2.潍柴动力股份有限公司，山东 潍坊 261061）

    摘要：针对某水泥搅拌车空调压缩机故障，提出解决思路。通过NVH试验及LMS Test.lab振动试验方法，确定故障源为空调压缩机振动异常，振动主要集中在空调压缩机对应的谐次，且随转速的增高，振动成倍增大。通过更换动平衡较好的空调压缩机，系统整体振动得到明显改善。采用CAE仿真分析方法，对系统强度进行仿真及优化，提升系统模态的稳定性，通过试验及长时间的运行验证，证实方案可行，能够提高空调系统运转的可靠性。

    关键词：LMS Test.lab；柴油机；空调压缩机；NVH；CAE

    Abstract：In this paper, the solution of this fault is put forward according to the failure of the air conditioner compressor in a cement mixer truck. Through the test method of LMS Test.lab and NVH test, determined the source of failure is air conditioner compressor abnormal vibration, vibration mainly concentrated in the resonance frequency of the air conditioning compressor, and vibration increased as speed increased. By replacing it with a dynamic balance better air conditioner compressor, dramatically improved the system. Simulation and optimization with CAE method, optimized the system modal. Subsequent experiments and long time operation, confirmed the feasibility of the scheme, thus improving the reliability of the air conditioning system operation.

    Key word: LMS test.lab;diesel engine;air conditioning compressor;NVH