LD480柴油机试验模态分析

摘要

By using random signal and vibration analysis system CRAS4.1 edition, modal experiment and analysis were carried out with hammer hiting on main parts of LD480 Diesel Engine, the former 5 ranks (or geater than 5 ranks) mode parameters and vibration models were obtained. By identifying mode parameters of the frame, foundation can be provided for dynamic analysis and improving design of main parts of LD480 Diesel Engine.%利用随机信号和振动分析系统CRAS4.1版，采用锤击法对LD480柴油机的机体、曲轴、缸盖及其组合结构的自由模态进行试验模态分析，并获得了其前5阶(不少于5阶)模态参数及振型。通过对结构模态参数的识别，为LD 480柴油机主要零部件结构的动力学分析和结构的改进设计提供了依据。