Measuring device and method for mechanical junction surface dynamic contact parameters based on surface texture

Abstract

Provided is a measuring device and method for mechanical junction surface dynamic contact parameters based on a surface texture. The measuring device comprises bases and a base plate, the base plate is connected with the bases through first lead screws, a fixing sleeve is fixed on the base plate, a guiding shaft is arranged in the fixing sleeve, a normal force application bolt abuts against the guiding shaft upwards, a cushion block is arranged above the guiding shaft, a pressure sensor is arranged between the cushion block and the guiding shaft, a first test specimen is fixed on the cushion block, the bases on the two sides are connected to a crown plate through second lead screws respectively, an exciter and a second test specimen are arranged on the crown plate, the exciter downwards abuts against the second test specimen, acceleration sensors are arranged on the two sides of the second test specimen, and by adjusting a first lead screw and / or a second lead screw, normal contact or tangential contact between the second test specimen and the first test specimen is controlled; the measuring device is simplified into a single-degree-of-freedom system, measuring of rigidity of normal contact and tangential contact of the two test specimens can be conducted by means of one device, the structure is simple, and the complexity degree of testing is reduced.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a device and method for measuring dynamic contact parameters of a mechanical bonding surface based on surface texture. Background technique [0002] Machinery is often composed of many parts, and the parts are matched and connected in different ways. The interface connected between mechanical parts is called "mechanical interface". Due to the existence of the mechanical joint surface, the local stiffness of the machine is reduced, so that the whole machine is not a continuum, which has an important impact on the dynamic performance of the entire mechanical structure. According to statistics, more than 60% of mechanical vibration problems come from the mechanical joint surface . In contact dynamics, the mechanical interface is regarded as a flexible system, and two important parameters of contact stiffness and contact damping are used to characterize the dynamic c...

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Problems solved by technology

[0003] Most of the existing test devices for contact stiffness and contact damping of the mechanical joint surface are multi-degree-of-freedom systems, which increase the complexity of the test and make it difficult to accurately obtain the test signal of the dynamic characteristics of the joint surface; moreover, most of the existing test devices are single test devices. Can only measure normal or tangential contact parameters of mechanical joints

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