Method for determining normal contact rigidity of fixed joint faces

Abstract

The invention discloses a method for determining normal contact rigidity of fixed joint faces. The method comprises the following steps of: calculating the normal static rigidity of small local joint faces, establishing contact surfaces and fitting a characteristic parameter matrix of micro convex bodies, establishing the contact rigidity expression kn of a single pair of the micro convex bodies, and obtaining the normal contact rigidity Kn of the joint faces and the normal contact rigidity Ktot of the entire joint faces, wherein Kn is equal to the summation of kn, and Ktot is equal to the binary integral of KP(P(x,y))dxdy. By means of the method, the contact information among the micro convex bodies can be learned visually, and the influence of uneven surface pressure distribution caused by errors in external waviness or shapes on the normal contact rigidity of the joint faces can be considered.

Description

technical field [0001] The invention relates to a method for determining the normal contact stiffness of a fixed joint surface, in particular to a determination method based on the microscopic appearance of two contact surfaces of the joint surface and using theoretical calculation. Background technique [0002] There are a large number of joint surfaces in complex mechanical systems such as machine tools and large aircrafts. Since the connection characteristics of the joint surfaces are nonlinear, if the problem of the joint surface of the mechanical system cannot be scientifically and effectively dealt with, it will face problems in the design, manufacture and assembly of the product. Therefore, the accurate establishment of the characteristic parameter model of the joint surface will provide a theoretical basis for the design of complex mechanical systems and improve the performance prediction ability of the whole machine. [0003] In the joint surface characteristic para...

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Problems solved by technology

This kind of research on microscopic contact behavior is based on many assumptions. Although the contact model has been developing and perfecting, the existing contact models basically still have the following problems: 1. The two rough surfaces simplifies the contact between a rigid plane and a rough surface; 2. Simplifies the complex contact behavior of a single pair of asperities at the joint surface to the contact between a rigid plane and a single equivalent asperity; 3. In the whole research In the contact behavior of the surface, it is assumed that the height of the surface profile obeys a certain function distribution such as a normal distribution, and the statistical parameters of the surface roughness such as the average radius of curvature are used; 4. The contact stiffness at the joint surface is limited to the roughness scale level, and no consideration Influence of geometric shape, i.e. waviness, and macroscopic shape error on the contact stiffness of joint surface

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