Abstract
Abstract. The dynamic characteristics of the mechanical joint surface are important aspects of the dynamic theoretical analysis and optimization design of the machine tool. In this paper, the typical mechanical joint surface is taken as the research object. Through the combination of theoretical analysis and experimental analysis, the dynamic characteristics of typical joint surface parameters with different surface textures and the influence of texture parameters on the dynamic characteristics of the joint surface are studied. Based on the Hertz elastic contact theory and the contact fractal theory, the normal and tangential contact fractal models of the joint surface are derived, and then a mathematical model of the joint surface normal and tangential contact stiffness considering the domain expansion factor is established. The influence of surface texture parameters on the dynamic characteristics of the surface is further studied according to the model. In addition, the design of the experimental device and experimental scheme design are completed by the contact resonance method and the ERA algorithm, and the joint surface parameter identification experiment with texture is conducted. The normal and tangential frequency response functions of the joint surface, the dynamic characteristic parameters of the joint surface and the influence law of the joint surface parameters on the contact characteristics are obtained through the dynamic test analysis technology.
Highlights
Mechanical structures and machines are widely used in the field of aerospace manufacturing and biomedical as important components, and these mechanical systems consist of many components containing joint surfaces according to specific requirements
Before analyzing and establishing the joint surface normalized contact stiffness fractal model and the tangential contact stiffness fractal model considering the influence of the domain expansion factor, the distribution function of the microconvex is firstly obtained based on the surface fractal theory in the paper
This paper mainly studied the surface texture effect combined with the surface contact parameters
Summary
Mechanical structures and machines are widely used in the field of aerospace manufacturing and biomedical as important components, and these mechanical systems consist of many components containing joint surfaces according to specific requirements. The dynamic characteristics of the joint surface has a decisive influence on the effectiveness of the constructed kinetics model, and directly affects the service life of the mechanical structure. It has a very important impact on the dynamic performance of the entire mechanical structure. Smallwood et al (2000) studied the dynamic characteristics of the tangential direction of the mechanical joint surface by experimental methods. The mathematical model of the normal and tangential contact stiffness of the joint surface is established; In Sect.
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