LQ6105柴油机气缸体模态试验研究及静、动态有限元分析

Research on the Modal Test of a LQ6105 Diesel Engine Body and its Static and Dynamic Finite Element Analysis

内燃机产品的设计、改型都应进行静态计算及动态分析。目前，常用的且行之有效的方法有：有限元计算分析和试验模态分析。有限元计算分析的主要特点是：其计算分析结果的可靠与否主要取决于计算的数学模型。本文将有限元计算分析与试验模态分析结合使用。利用试验模态分析低频段主模态参数较为可靠的特性来修改有限元计算的数学模型，使有限元单元划分方案及边界条件更接近实际部件的结构。进而对ＬＱ６１０５增压中冷柴油机缸体进行静、动态分析，验证了本文方法的有效性，并获得满意的效果。

Static and dynamic analysis should be done when designing and modifying the product of the engine.The FEA (finite element analysis) and the test model analysis are the effective methods,which are commonly used at present.The former has its particular characteristics:its reliability chiefly depends on the model applied.In this paper,the FEA and the test model analysis are used in combination.The low frequency modal parameters from modal test,which are much reliable in low frequency,are applied to modify FEA model which,on the other hand,coincides with the practical structure more precisely in boundary condition and in element separation.The combined method is verified for a LQ6105 diesel engine body and a satisfactory result is obtained.