A non-contact eddy current sensor structural modal testing method

A technology of eddy current sensors and eddy current sensors, which is applied in the testing of machines/structural components, testing of mechanical components, instruments, etc., can solve problems such as structural resonance and system damping reduction, and achieve high accuracy, good implementability, The effect of stable test results

Active Publication Date: 2019-09-17
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for truly and accurately testing the natural frequency and system damping of the structure of the eddy current sensor of the steam turbine, so as to solve the problem of structural resonance and system damping reduction caused by the installation of the eddy current sensor

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  • A non-contact eddy current sensor structural modal testing method
  • A non-contact eddy current sensor structural modal testing method
  • A non-contact eddy current sensor structural modal testing method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] like figure 1 As shown, a structural modal test method of a steam turbine eddy current sensor, which uses the test environment stimulus response and pulse stimulus response to test the natural frequency and damping of the steam turbine eddy current sensor, specifically includes the following steps:

[0027] (1) In the cranking state of the unit, test its environmental vibration response through the online eddy current sensor, and calculate the response frequency f near the working speed according to the frequency response analysis 1 , f 2 , to preliminarily judge the vibration characteristics of the eddy current sensor. where f 1 , f 2 are the two response frequencies closest to the operating speed.

[0028] (2) Along the direction perpendicular to the metal casing of the eddy current sensor (such as figure 2 Shown) Hammer the shell of the...

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Abstract

The invention belongs to the vibration test technology field and especially relates to a non-contact eddy current sensor structure modal test method. The invention aims at providing a method used for really and accurately testing an inherent frequency and system damping of a turbine eddy current sensor structure so as to solve problems of structure resonance and system damping reduction caused by installation of an eddy current sensor. By using the method of the invention, each direction of the inherent frequency of the eddy current sensor structure can be really and comprehensively tested, and inherent vibration characteristics of the eddy current sensor under an actual installation state and work operation can be effectively restored. The method can be simply operated, used time is short and good performability is possessed. In the method, through setting parameters of a vibration test direction, a concern frequency range and the like, a test result is stable and accuracy is high; and a high resonance fault diagnosis value is possessed.

Description

technical field [0001] The invention belongs to the technical field of vibration testing, and in particular relates to a structural mode testing method of a non-contact eddy current sensor. Background technique [0002] The radial vibration of large rotating mechanical shafts such as steam turbines, water turbines, and blowers is generally measured by non-contact eddy current sensors. , The eddy current sensor is connected with the internal thread at the end of the casing through the external thread, and the casing is connected and fixed with the bearing cover of the steam turbine through the internal and external thread sleeve and the lock nut. In the working state, the casing is a cantilever structure fixed at a single point. During the operation of the unit, the cantilever casing often resonates at the working speed due to loose threaded connections or wrong gasket installation, which in turn causes distortion of the vibration signal of the large shaft. Aiming at the res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/06G01H13/00G01H15/00G01M13/00
Inventor 史庆峰司先国张晖王大成王宏王启峰张精干
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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