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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。
Internal combustion engine product design, modification should be static calculation and dynamic analysis. At present, commonly used and effective methods are: finite element analysis and experimental modal analysis. The main characteristic of finite element analysis is that the reliability of calculation and analysis depends on the mathematical model of calculation. This paper combines finite element analysis with experimental modal analysis. Experimental modal analysis of low frequency main mode parameters more reliable characteristics to modify the mathematical model of finite element calculation, the finite element unit and the boundary conditions of the program closer to the actual structure of the components. Then the LQ6105 supercharged intercooled diesel engine block static and dynamic analysis to verify the effectiveness of this method, and obtain satisfactory results.