In this paper, a research on dynamic behavior of a diesel engine block is carried out in Finite Element Method (FEM). Natural frequencies and Modal shapes are obtained by FEM calculation. In order to validate the calculation result, a mode experiment is conducted by a single pulse excitation method. In the experiment, the natural frequencies, modal shapes and modal damping of the engine block are determined. Besides, based on the acquired vibration mode, the weak positions on this block are identified. Additionally, in order to acquire the experimental results accurately, some important factors included in this experiment such as the choice of excitation methods, structure supports, sensor installation and so on, should be given careful considerations. Comparison between the calculated results and the test data shows that the FEM model is reliable.

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