Device for testing dynamic characteristic parameters of fixed joint surface and testing method thereof

Abstract

The invention relates to a device for testing dynamic characteristic parameters of a fixed joint surface of a single-degree-of-freedom system. The device comprises a base, a lower experimental plate, an experimental sample wafer, an upper experimental plate, a piezoelectric acceleration transducer, a bolt, a bracket, a vibration exciter, an impedance head, a charge amplifier, a digital analyzer, a power amplifier, an electronic computer, a normal coupling bolt hole, a lower experimental plate coupling bolt, a tangential coupling bolt hole and a flexible rope. Compared with the prior art, the device has the remarkable advantages of compact structure and clear testing principle; the dynamic characteristic parameters of a normal contact surface and a tangential contact surface can be simultaneously measured; the dynamic characteristic parameters of the contact surfaces in different load states can be measured by adjusting the pre-tightening force of the coupling bolt of the upper experimental plate and the lower experimental plate; the excitation force passes through the center of gravity of the upper experimental plate during measurement; vibration signals of the upper experimental plate and the lower experimental plate are simultaneously measured; the influence of the vibration signal of the base is eliminated during the calculation of a frequency response function of the system; and the device has the characteristics of high efficiency, stability and accuracy.

Description

technical field [0001] The invention relates to a testing device for dynamic characteristic parameters of a mechanical joint surface and a testing method thereof, in particular to a testing device for dynamic characteristic parameters of a fixed joint surface and a testing method thereof. Background technique [0002] There are a large number of mechanical joint surfaces in the mechanical structure, and the contact stiffness and damping of these joint surfaces have an important influence on the overall stiffness and damping of the mechanical structure. The contact stiffness accounts for about 60-80% of the total stiffness of the machine tool. Therefore, obtaining accurate dynamic characteristic parameters of the mechanical interface is the basic guarantee for the analysis of the overall dynamic characteristics of the mechanical structure. At present, although various dynamic models of mechanical joint surfaces have been established, it is still difficult to obtain basic dyn...

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Problems solved by technology

This test device does not eliminate the influence of the box (foundation displacement) on the measured position, nor does it take into account whether the mode shape conforms to the basic theory, the test points are relatively small, and the test method is simple. In addition, the normal and tangential dynamic characteristic parameter measurement device Different, due to the change of the contact state between the joint surfaces, it is impossible to compare the normal and tangential dynamic characteristic parameters of the same joint surface

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