Method and device for testing dynamic stiffness of vibration isolator

Abstract

The invention discloses a method and a device for testing dynamic stiffness of a vibration isolator. The method comprises the steps of establishing an equivalent test model of a single-degree-of-freedom vibration system in a vibration isolation direction by using a static loading device, a combined vibration mass block and an elastic simply supported beam, measuring a frequency response function of the equivalent test model by an exciting method, and then indirectly obtaining the dynamic stiffness of the vibration isolator by virtue of a vibration equation, the similarity of the vibration system and the characteristics of the single-degree-of-freedom system. The method avoids the problem that the existing methods all need to simulate a rated load or a working load with an equivalent mass block in an ingenious way, and solves the problem that the test system is clumsy, high in test cost and test difficulty and even unachievable if the mass block is used for simulating high rated load or working load; the testing device is light and simple in structure, convenient to operate, and economical and practical; the method and the device are applicable to the dynamic stiffness tests of all single-axis vibration isolators, high in applicability, and especially capable of realizing testing of the dynamic stiffness of a large-rated load vibration isolator and ensuring high precision.

Description

technical field

[0001] The invention relates to the technical field of engineering testing, in particular to a method and a device for testing the dynamic stiffness of a vibration isolator. Background technique

[0002] The dynamic stiffness of a vibration isolator is its ability to resist deformation under dynamic load. It is a function of frequency and usually has obvious nonlinear characteristics. It is a key index to describe the vibration reduction performance of a vibration isolator. The dynamic stiffness test is an important part of the performance evaluation of the vibration isolator, and it is a test item that must be carried out before the vibration isolator is put into use. At present, the specific testing methods include the vibration excitation method and the hammering method. But no matter what method is used, it is necessary to use a mass block to simulate the rated load or working load. The mass block and the vibration isolator together form a spring mass sys...

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