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2014•Internal combustion EnginesOpen access

Modal Analysis and Experimental Verification for a Cylinder Block of Diesel Engine

Zhi-bin Su

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Abstract

In this paper, a 3D model of an in-line four-cylinder diesel engine block was established. The free modal analysis of the block was carried out with FEM method. The first five natural frequency and corresponding mode shape of the block were presented. The vibration rule and anti vibration weak area were discussed. A free-free modal test was conducted to prove the model accuracy. Comparison shows that the results of FEM calculation are in good agreement with those of testing. The biggest relative error of natural frequency is 6.3%. The finite element model is accurate and can be used for future optimization and dynamic analysis.

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What this paper is about

In this paper, a 3D model of an in-line four-cylinder diesel engine block was established. The free modal analysis of the block was carried out with FEM method. The first five natural frequency and corresponding mode shape of the block were presented. The vibration rule and anti vibration weak area were discussed. A free-free modal test was conducted to prove the model accuracy. Comparison shows that the results of FEM calculation are in good agreement with those of testing. The biggest relative error of natural frequency is 6.3%. The finite element model is accurate and can be used for future optimization and dynamic analysis.

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Available abstract

In this paper, a 3D model of an in-line four-cylinder diesel engine block was established. The free modal analysis of the block was carried out with FEM method. The first five natural frequency and corresponding mode shape of the block were presented. The vibration rule and anti vibration weak area were discussed. A free-free modal test was conducted to prove the model accuracy. Comparison shows that the results of FEM calculation are in good agreement with those of testing. The biggest relative error of natural frequency is 6.3%. The finite element model is accurate and can be used for future optimization and dynamic analysis.

Key concepts: Cylinder block, Finite element method, Modal analysis, Modal, Vibration, Natural frequency, Block (permutation group theory), Diesel engine

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