A Method for Analyzing Contact Stress of Revolving Pair with Clearance

Abstract

The invention relates to a method for improving the calculation accuracy of contact stress in the finite element analysis of a gap rotating pair. For the finite element model of the clearance rotating pair, the meshing of the contact boundary is carried out, and the numerical integration points are set at the contact boundary of the bearing. The projection point and its parameter coordinates of each numerical integration point on the contact boundary of the rotating shaft are searched, and the normal distance and geometric measure at the projection point are calculated. After completing the search of all projected points and the calculation of related variables, the parameter coordinates of the equivalent projected points, normal distance, geometric measure, normal and tangential traction are calculated for each node of the bearing contact boundary. After the cycle completes the calculation of the equivalent variables of all nodes, the contact force virtual work integral is calculated and submitted to the system equation. This method can eliminate the over-constraint of the system caused by the increase of the number of integration points, and reduce the fluctuation of the contact stress in the rotating pair of gaps.

Description

Technical field[0001]The present invention relates to computer auxiliary engineering analysis, and more particularly to a method for simulating a gap rotating sub-contact stress in finite element analysis, which is used for time propulsion engineering simulation to assist users in improvement. Engineering products (for example, cars, aircraft) are designed to make decisions.Background technique[0002]Due to factors such as design, manufacturing, processing, wear, the rotational deposit in mechanical systems (e.g., cars, aircraft, machine, machine, robot) can inevitably exist. The gap causes the bearing and the shaft frequent contact collision during the relative exercise, introduce vibration, noise, wear, etc. in the system, which seriously affects the operating accuracy of the system and shorten the service life. Therefore, analyzing the dynamics response of the agencies containing the gap motility has important academic significance and economic value.[0003]Finite element methods a...

AI Technical Summary

Problems solved by technology

From the perspective of imposing contact constraints, too few integration points are likely to cause missed contact detection, and the integration accuracy cannot be guaranteed. Therefore, it is generally necessary to arrange multiple numerical integration points

However, due to the limited number of nodes after the finite element discretization of the contact boundary, too many integration points will lead to over-constraint of the system equations, which will cause stress fluctuations at the contact boundary and affect the accuracy of numerical analysis

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