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

A technology of mechanical impedance and vibration isolator, applied in the direction of measuring mechanical impedance, instruments, measuring devices, etc., can solve problems such as system error of blocking method, lack of effective mass and stiffness, base does not satisfy the assumption of infinite effective mass and stiffness, etc. , to achieve the effect of reducing test cost and test conditions

Active Publication Date: 2019-11-19
NORTHWESTERN POLYTECHNICAL UNIV
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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 stif

Method used

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

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Embodiment Construction

[0046] Embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0047] Such as image 3 As shown, in this embodiment, a small single-input and single-output steel spring vibration isolator under no-load conditions is used as the vibration isolator under test, and only the mechanical impedance in the Z direction is considered. If the vibration isolator under test is large, it is generally necessary to install a rigid transition piece between the force sensor and the vibration isolator under test, so that the force sensor is evenly stressed and the test is accurate. The vibration isolator under test in this embodiment is relatively small, so there is no need to install a transition piece.

[0048] The inventive method comprises the following steps:

[0049] Step 1: If image 3 As shown, a test system is built, and the tes...

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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...

Claims

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Application Information

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IPC IPC(8): G01H15/00
CPCG01H15/00
Inventor 王敏庆王骁盛美萍
Owner NORTHWESTERN POLYTECHNICAL UNIV
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