Device and method for testing dynamic characteristic of combined surface

Abstract

The invention relates to a device and a method for testing the dynamic characteristic of a combined surface, belonging to the field of mechanical design and manufacture. A vibration exciter (8) is connected with a force sensor (10) by a top rod (4); an upper test piece (12) is connected at the other end of the force sensor (10); and a displacement sensor (11) and an acceleration sensor (3) are symmetrically distributed on the two sides of the upper test piece (12). The vibration exciter is used for exciting and vibrating the upper test piece to acquire an acceleration signal, a displacement signal and a force signal; all the signals are transmitted to an LMS modal testing system and sent to a computer after being processed by the LMS modal testing system; and the computer acquires a frequency response function of a test piece to be tested according to the acceleration signal, the displacement signal and the force signal and can recognize normal dynamic characteristic parameters of the combined surface between the upper test piece and a lower test piece according to the frequency response function. The invention solves the problem that the dynamic characteristic at the combined surface position is difficult to test, and can be convenient to separate the normal dynamic characteristic of the combined surface from the dynamic characteristics of an experiment device.

Description

Technical field [0001] The invention is a device for testing the normal dynamic characteristics of the bonding surface and belongs to the field of mechanical design and manufacturing. Background technique [0002] The mechanical structure is a whole composed of many parts and components combined according to certain functional requirements, and the surface where the parts combine with each other is called the "joint surface". The bonding surface has both contact stiffness and contact damping, which have a great influence on the dynamic performance of the structure, and the mechanism of action is very complicated. There are many factors that affect the dynamic characteristics of the bonding surface, and they are very complex. These factors mainly include: [0003] (1) Material of bonding surface (including material, hardness, etc.); [0004] (2) Machining method of bonding surface (common methods: turning, milling, planing, grinding, scraping, etc.); [0005] (3) The processing quali...

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Problems solved by technology

[0013] There are so many influencing factors, and their influencing laws are mostly nonlinear, and some factors affect each other, so it is impossible to directly determine their influencing laws and degree of influence by means of theoretical analysis. Experimental research is necessary. method to solve

[0014] In order to systematically study and ascertain the relationship between the dynamic characteristics of the joint surface and its basic influencing factors, and to master the dynamic basic characteristic parameters of the joint surface, a complete set of devices and methods for testing the normal dynamic characteristics of the joint surface are needed, but there is no such Devices for testing the normal dynamic characteristics of joint surfaces

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