Mechanical joint surface tangential rigidity dynamic measuring device and measuring method

Abstract

The invention discloses a mechanical joint surface tangential rigidity dynamic measuring device comprising a cylindrical tank which is internally provided with a shaft core. The external wall of the shaft core is sleeved by a shaft sleeve, and a gap is reserved between the external wall of the shaft sleeve and the internal wall of the tank. A joint surface is formed between the shaft core and theshaft sleeve. An acceleration measuring device is connected on the upper surface of the shaft core and the shaft sleeve, and each acceleration measuring device is connected with signal acquisition equipment through a lead. The center of the bottom part and the external wall of the two sides of the tank are provided with air inlets. The problems that the influence of other joint surfaces and othersurrounding factors cannot be eliminated in the measuring process of the present joint surface rigidity measuring device and the measuring result is not accuracy because of the fact that the uniform shear stress cannot be applied can be solved. According to the measuring method, measurement of the single joint surface can be realized so that joint surface tangential rigidity measurement is enabledto have high accuracy and practical value, and the measuring method is easy.

Description

technical field [0001] The invention belongs to the technical field of measuring devices for characteristics of mechanical joint surfaces, relates to a dynamic measuring device for tangential stiffness of mechanical joint surfaces, and also relates to a method for measuring tangential stiffness of mechanical joint surfaces by using the measuring device. Background technique [0002] For a mechanical structure composed of multiple parts, the contact properties of its joint surface, including normal contact stiffness and tangential contact stiffness, normal contact damping and tangential contact damping, are important to the stiffness and damping of the overall structure. For example, in the machine tool structure, more than half of the rigidity of the whole machine is contributed by the joint surface, and the damping of the joint surface accounts for more than 60% of the damping of the whole machine; in the process of mechanical design, it is necessary to know the stiffness an...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a dynamic measuring device for the tangential stiffness of the mechanical joint surface, which solves the problem that the existing joint surface stiffness measurement device cannot exclude the influence of surrounding factors such as other joint surfaces and the joint surface cannot apply uniform shear. The problem of inaccurate measurement results due to shear stress

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