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Method for determining assembly reliability of detachable disc-drum rotor

A drum-shaped rotor and reliability technology, which is applied in the field of judging the reliability of the assembly of a detachable drum-shaped rotor, can solve the problem that the assembly reliability of the detachable drum-shaped rotor, the inconsistency of the changing process of the looseness, and the single The characteristic change trend is not monotonic, etc.

Inactive Publication Date: 2013-03-13
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

The analysis results show that when the assembly is loose, the amplitude of the statistical features will change to varying degrees; however, the change trend of a single feature is not monotonous, which does not conform to the change process of the looseness, and cannot be used as a reliable assembly of a removable disc-drum rotor. Judgment index of degree

Method used

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  • Method for determining assembly reliability of detachable disc-drum rotor
  • Method for determining assembly reliability of detachable disc-drum rotor
  • Method for determining assembly reliability of detachable disc-drum rotor

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Embodiment Construction

[0046] The method of the present invention obtains its dynamic response signal through the percussion test of the detachable disc-drum type rotor stand, extracts the time domain feature, frequency domain feature and wavelet domain feature of the dynamic response signal to form a state feature matrix; then establishes the orthogonal sub-matrix of the state feature matrix space; finally calculate the main included angle of the subspace base vector, and define a reliability index—the cosine value of the main included angle to determine the reliability of the rotor assembly.

[0047] The present invention is implemented according to the following specific steps:

[0048] 1) Construct the state feature matrix and establish the state feature matrix subspace

[0049] The bench knocking test was carried out on the detachable disc-drum rotor, and the dynamic response signals (good assembly state and unknown assembly state) of the detachable disc-drum rotor were collected by vibration a...

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Abstract

The invention discloses a method for determining the assembly reliability of a detachable disc-drum rotor. The method comprises subjecting the detachable disc-drum rotor to bench knock test, collecting dynamic response signals, extracting characteristics, and constructing characteristic matrixes of various assembly states; creating orthogonal subspaces of the characteristic matrixes of all the states; and calculating a main included angle of orthogonal subspace base vectors of reference states and unknown states, and defining an indicator-a main included angle cosine which is used for determining the assembly quality of the detachable disc-drum rotor and serves as a reliability degree of the assembly quality of the detachable disc-drum rotor. The method is simple and convenient to operate, reliable in result and high in real-time performance; applicable to production fields for determining reliability degrees of detachable disc-drum rotors and helpful for improving assembly qualities and operation reliabilities of detachable disc-drum rotors in aero-engines and gas turbine engines, and has engineering application values.

Description

technical field [0001] The invention relates to mechanical equipment assembly quality inspection (reliability judgment), in particular to a method for judging the assembly reliability of a detachable disc-drum rotor used in an aero-engine or a gas turbine. Background technique [0002] In large and complex rotating mechanical equipment such as aeroengines and gas turbines, the detachable disc-drum rotor is a widely used rotor structure. It mainly uses pull rod bolts to compress the independent wheel discs at different levels to form a complete rotor structure. In this rotor structure, the magnitude of the pretightening force of the tie rod bolts and the difference between the pretightening forces of each tie rod bolt affect the dynamic characteristics of the entire rotor structure, which in turn affects the overall working performance of the equipment. In order to ensure good assembly quality, there are strict assembly process requirements in the actual assembly process. I...

Claims

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Application Information

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IPC IPC(8): G01M13/00
Inventor 何正嘉孙闯曹宏瑞李兵申中杰訾艳阳陈雪峰张周锁
Owner XI AN JIAOTONG UNIV
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