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A modal test method for a steam turbine generator frame

A technology for modal testing of turbogenerators, which is applied in the testing of machines/structural components, vibration testing, measuring devices, etc., can solve problems such as the lack of modal testing methods for generator bases, and achieve the value of strong resonance fault diagnosis , good implementability and high accuracy

Active Publication Date: 2020-06-19
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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Problems solved by technology

[0006] At present, many power generation equipment have corresponding vibration test methods, but there is no specific method for modal testing in the horizontal direction of the generator base. However, the generator base has unique requirements in terms of dynamic performance. It is necessary to meet the requirements of natural frequency avoidance, and in the working state, it is more necessary to be able to adapt to the vibration of the environment to ensure that the generator base can reasonably avoid a certain range of operating speed without resonance

Method used

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  • A modal test method for a steam turbine generator frame
  • A modal test method for a steam turbine generator frame
  • A modal test method for a steam turbine generator frame

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 As shown, a modal test method of a turbogenerator base, the method adopts transient excitation or working state environment excitation vibration test to carry out vibration test on the stator base of the stopped or on-line generator, and the tested base is about to be hammered or Under the environment vibration excitation under the stable working state of the unit, the excitation test is carried out along the horizontal direction perpendicular to the axis of the unit, which specifically includes the following steps:

[0031] Step 1: If figure 2 and image 3 As shown, at least 20 measuring points 1 are selected on the generator base. The selection principle of measuring point 1 is to select as much as possible to reflect the mode shape of the base, avoid selecting nodes, and use a measuring point 1 as a reference point;

[003...

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Abstract

The invention belongs to the technical field of vibration testing, particularly relates to a modal testing method for a turbine generator base, and aims at providing a horizontal modal testing method for the turbine generator base which is strongly-targeted, reliable in testing result, and beneficial for solving the base resonance problem so as to solve defects in the prior art. The method can carry out the horizontal modal test in a targeted manner on the inherent vibration performance of the generator base on which the set is running on-line or shutdown, and effectively restore the inherent vibration characteristic of the generator stator base in the actual installation state and the operation state. The method is simple to operate and has good enforceability. The method has the advantages of stable testing results, the high accuracy rate and high resonance diagnostic values by setting the parameters such as the test direction and the concern frequency range of the vibration.

Description

technical field [0001] The invention belongs to the technical field of vibration tests, and in particular relates to a modal test method for a steam turbine generator base. Background technique [0002] According to the provisions of the national machinery industry standard JB / T 10392-2013 "Turbo-type generator stator frame, iron core dynamic characteristics and vibration test method and evaluation", before the large-scale generator frame is officially put into use, it is necessary to conduct relevant performance tests. Debugging and inspection, and modal test is an important part of it. However, there are many related test methods at present, but the elliptical natural mode frequency of the generator stator frame has certain requirements for avoiding 2 times the working speed, but there is no clear requirement for other frequencies to avoid. The current design or field test is mainly aimed at avoiding the elliptical 2-fold frequency of the base shell, or the radial vibrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
CPCG01M7/02
Inventor 史庆峰王秀瑾张兴田孙庆司先国杨宇李汪繁蒋俊
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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