Method for testing mechanical impedance of vibration isolator by considering influence of base

Abstract

The invention provides a method for testing mechanical impedance of a vibration isolator by considering the influence of a base. The flexible base with the limited mass and the limited rigidity can beused in a testing process; the influence of the characteristics of the base on the mechanical impedance of the vibration isolator can be considered; and the defect of a blocking method can be compensated, so that the obtained mechanical impedance can better conform to the mechanical impedance characteristics of the vibration isolator in an actual vibration isolation system. According to the method, a special impedance table no longer needs to be used for testing, so that the testing conditions are reduced and the testing cost is reduced; and the problem of a testing error caused by the fact that the impedance table does not meet the "blocking" requirement is not required to be considered.

Description

technical field [0001] The invention relates to the technical field of vibration isolator testing, in particular to a method for testing the mechanical impedance of a vibration isolator considering the influence of a base. Background technique [0002] As a characterization of the dynamic characteristics of the isolator, the mechanical impedance of the vibration isolator is the main index for the design and performance optimization of the vibration isolator, and is also an important parameter for the evaluation of the effect of the vibration isolation system. An integral part of the application process. Since most vibration isolators have complex structures, different material properties, and are easily affected by environmental factors such as load conditions and temperature, it is difficult to establish an accurate mathematical model to obtain an analytical solution for their mechanical impedance. Therefore, the mechanical impedance of the vibration isolator is obtained U...

AI Technical Summary

Problems solved by technology

However, in the actual vibration isolation system, any base does not have infinite effective mass and stiffness at any frequency. For bases with finite mass or greater flexibility, the higher the frequency, the structural mode of the base The more abundant, the more resonance points of the structure, the more the foundation does not satisfy the assumption of infinite effective mass and stiffness

Since the blocking method does not consider the influence of the base on the mechanical impedance of the vibration isolator, there is often a certain difference between the mechanical impedance obtained by the blocking method and the mechanical impedance of the vibration isolator in the actual vibration isolation system, that is, the blocking method itself has Obvious systematic error

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