Method for testing bolt joint surface contact damping characteristics

Abstract

A method for testing bolt joint surface contact damping characteristics is based on an experimental device of bolt joint surface contact damping characteristics. According to the method, as for testing of normal damping characteristics or testing of tangential damping characteristics, different setting is firstly performed; then, longitudinal periodical dynamic loads are applied to a lower test piece and an upper test piece; in the process of applying the periodical dynamic loads, a linear displacement sensor and a force sensor transmit a bolt joint surface linear displacement change signal and a periodical dynamic load signal to a data collection system respectively, and then the signals are output to a computer; and bolt joint surface linear displacement data and dynamic load data of the same period in the stabilization stage during the loading process are selected, the selected joint surface linear displacement data of one period are taken as an X axis, the dynamic load data of the same period are taken as a Y axis, a load-displacement curve is drawn, and the curve is a hysteresis loop which is used for representing the bolt joint surface contact damping characteristics.

Description

technical field [0001] The invention relates to a method for testing the contact damping characteristics of bolt joint surfaces, which belongs to the fields of mechanical manufacturing and mechanical dynamics. Background technique [0002] Machine tools and even all kinds of machinery, in order to meet the requirements of function, performance and processing, as well as the convenience of transportation, are generally not a continuous whole, but are combined by various parts according to certain specific requirements. The contact surface between parts, components, and components is called "mechanical joint surface", referred to as "joint surface", or "contact surface". A large number of joint surfaces exist in the mechanical structure, so that the mechanical structure or system no longer has continuity, which leads to the complexity of the problem. There are contact stiffness and contact damping at the joint surface. From the perspective of mechanical dynamics, the joint s...

AI Technical Summary

Problems solved by technology

However, it is very difficult to measure, identify, and separate joint surface damping

[0009] Although there are many research papers on the basic characteristics of the joint surface, there are very few papers that actually give the dynamic basic characteristic parameters of the joint surface. Some results or conclusions have not been confirmed, so further experimental research is needed; find a comparison The ideal method for identifying the contact damping characteristic parameters of the joint surface is a prerequisite for further improving the performance prediction level of the whole machine in the design stage

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