Vibration noise numerical simulation method for piston engine

Abstract

The invention discloses a vibration noise numerical simulation method for a piston engine. The method includes: establishing a three-dimensional entity simulation model and a finite element model of the three-dimensional entity simulation model for the plate-type structure on the surface of the piston engine, and performing vibration modal analysis of the plate-type structure on the three-dimensional entity simulation model to obtain a surface modal result set and a surface node coordinate file of the plate-type structure; performing multi-body dynamics analysis on the three-dimensional entitysimulation model in combination with a finite element model to obtain a plurality of different exciting forces of the piston engine; applying different exciting forces to the plate-type structure ofthe three-dimensional entity simulation model, and calculating dynamic response results of the plate-type structure under different exciting forces by utilizing a modal superposition principle; solving a frequency range requirement of an acoustic physical quantity according to the acoustic boundary element model, and performing roughening processing on the finite element model to obtain an envelope surface grid and a node coordinate file; endowing the dynamic response result to boundary element grid nodes of the node coordinate file, and calculating and obtaining acoustic physical quantity ofacoustic radiation of the plate-type structure.

Description

technical field [0001] The invention relates to the technical field of industrial simulation, in particular to the field of structural vibration and noise simulation of engines, in particular to a numerical simulation method for vibration and noise of piston engines. Background technique [0002] At present, many experts and scholars at home and abroad have carried out a lot of research on the structural noise radiation of engines from different angles. There are mainly the following parts: First, the mechanism research of acoustic radiation. The most distinctive research work is to reveal the essential characteristics of sound radiation by theoretically reconstructing the sound field. For example, Bouchet's research solves the characteristics of the radiation sound field excited by structural vibration through the linear expansion of a set of basis functions; second, the study of sound radiation prediction methods. Gerard used the acoustic transfer vector technology to so...

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Problems solved by technology

However, due to the complex structure of the piston engine, few people have carried out the overall integrated noise simulation research including the main bearing and the connecting rod mechanism.

[0004] At present, some scholars have simulated the vibration and noise of internal combustion engines by combining multi-body dynamics and finite element method, but it is time-consuming and not suitable for engineering applications

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