Modal synthesis dynamic modeling and analysis method for automobile driving axle system

Abstract

The invention relates to a modal synthesis dynamic modeling and analysis method for an automobile driving axle system. The method is characterized by comprising the steps that 1, a finite element model of all components of a driving axle is established, boundary nodes are defined according to the connecting relation between the components, a modal synthesis model of all the components is established, and a modal synthesis rigidity matrix and a mass matrix of all the components are obtained; 2, a connecting relation model of all the components is established; 3, the modal synthesis rigidity matrix and the mass matrix of all the components are assembled according to the connecting relation, a complete modal synthesis dynamic model of the driving axle system is established, and a rigidity matrix and a mass matrix of the driving axle system are obtained; 4, natural vibration frequency and a regular vibration mode of the dynamic model of the driving axle system are calculated, and a mode superposition method is adopted to calculate the dynamic response of the driving axle system under excitation of dynamic engaging force of gears of a main reducing gear. In the whole modeling process, high universality and calculating efficiency are achieved, and the method can be widely applied to dynamic analysis of a gear transmission system.

Description

technical field [0001] The invention relates to a modal comprehensive dynamic modeling and analysis method of an automobile drive axle system, belonging to the technical field of vehicle transmission. Background technique [0002] The drive axle is the core powertrain and the main source of vibration and noise of the automobile. The vibration and noise generated during its working process will seriously affect the reliability of the automobile, the comfort of the passengers and the safety of transportation. The dynamic excitation generated by the gear of the final drive during the meshing process is the main cause of the vibration and noise of the drive axle system. The dynamic performance has a very important influence. To accurately analyze the dynamic characteristics of the drive axle system, it is necessary to accurately establish the dynamic model of the complete drive axle system, so as to provide effective guidance for the design and analysis of drive axle products. ...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing studies use the centralized parameter model to model and analyze the gear transmission system. Although the centralized parameter modeling method has high computational efficiency, it cannot accurately simulate the characteristics of the components of the drive axle system, especially for the modeling of components such as housings and bearings. oversimplified

Since the driving axle contains multiple contact relationships, if the finite element contact calculation method is used to model the driving axle, the scale of the system model is huge, and the contact analysis needs to consume a lot of computing resources, and the solution efficiency and convergence are very low

Existing studies use space beam elements to model and analyze the dynamics of drive axles. Although they can ideally simulate drive train components, they cannot accurately reflect the characteristics of gears, cross shafts, and differential housings.

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