Measuring method of equipment endogenous characteristics under unbalanced turbulence force effect

Abstract

The invention aims at providing a measuring method of equipment endogenous characteristics under the unbalanced turbulence force effect. The measuring method comprises the following steps that a first group of vibration isolators are symmetrically arranged under machine feet of tested equipment, the tested equipment and the vibration isolators are respectively arranged on a rigid mass block, and all installing points are positioned on the same plane; four acceleration sensors are arranged at the machine foot part of the tested equipment and the tops of the vibration isolators and are sequentially connected with a signal amplifier and a signal collecting instrument; the tested equipment is started, the acceleration responses of four points are measured, then, the average acceleration response is taken, the average value of the acceleration responses of the plane center point of the machine feet of the tested equipment is obtained, and the speed response values of the first group of vibration isolators trough the speed and acceleration relationship are obtained; and the vibration isolators are replaced, the tested equipment is started, and the acceleration responses of four points are measured, so the speed response values of a second group of vibration isolators are obtained, and the turbulence force of the tested equipment and the equivalent mass of the tested equipment are obtained. The measuring method has the advantages that the precision is good, the operation is simple and convenient, the implementation is easy, and in addition, the controllability is high.

Description

technical field [0001] The present invention relates to a measurement method, in particular to a measurement method of endogenous properties. Background technique [0002] Due to the complexity of mechanical equipment, and when the equipment operates under different working conditions, the output force of equipment vibration is related to the characteristics of the receiving structure. Different bases and different installation methods will change the energy and contact force injected into the receiving structure. In the project, it is necessary to obtain the energy and excitation force characteristics of the equipment vibration output to the base under different installation conditions (different installation positions or methods), so as to perform acoustic prediction and control. However, the equipment manufacturer conducts a bench test before the equipment leaves the factory, measures the excitation force transmitted by the equipment to the bench, and gives the accelerati...

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Problems solved by technology

However, because the suspension conditions are not easy to meet, the free speed test of the equipment is usually supported by air springs, etc. Therefore, the free speed test of the equipment usually causes certain errors, which in turn leads to large errors in practical applications

The second method is to measure on the test bench and then apply it to the actual environment. Although this method is simpler and easier than the first method, since the measurement results are usually closely related to the stiffness of the vibration isolator and the test foundation, it is still necessary There is a certain error

Document 5 describes the use of the basic principles of the finite element method and the admittance method to indirectly estimate the output excitation force of the mechanical equipment on the base. The premise is that the characteristics of the base remain unchanged, but different bases and different installation methods will Change the energy and contact force injected into the receiving structure, so this method also has a certain error, and the size of the error depends on the change of the base

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