Quantitative recognition method for assembling loosening fault of dismountable disk drum type rotor
A disc-and-drum rotor, quantitative identification technology, which is applied to the testing of measuring devices, instruments, and mechanical parts, can solve the problems of poor assembly quality of detachable disc-drum rotors, good assembly quality of detachable disc-drum rotors, and poor assembly quality of rotors. Loose faults and other problems, to achieve good real-time performance, improve operational reliability, and strong versatility
Active Publication Date: 2014-01-29
XI AN JIAOTONG UNIV
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Embodiment 1
[0085] In order to verify the correctness of the method described in the present invention, the effectiveness of the invention is verified for three assembly states of the detachable disc-drum rotor of a certain type of aero-engine. Three assembly states of the detachable disc-drum rotor of a certain type of aero-engine:
[0086] (1) The assembly of the detachable disc-drum rotor is loose for one turn;
[0087] (2) The detachable disc-drum rotor assembly is loose for half a turn;
[0088] (3) The detachable disc-drum rotor is assembled in a qualified state;
[0089] Four sets of test signals were measured for each assembly state, and a total of 12 sets of test signals were obtained for the three assembly states.
[0090] figure 1 (a), (b), and (c) show the time-domain waveform diagrams of the dynamic response signals of a detachable disc-drum rotor of a certain type of aero-engine when it is loosely assembled for one circle, loosely assembled for half a circle, and qualifie...
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The invention discloses a quantitative recognition method for an assembling loosening fault of a dismountable disk drum type rotor. The method comprises the following steps: calculating the relative energy of a plurality of dynamic response sub-signals which have equal bandwidth, are mutually connected and have different frequency bands of the dynamic response signal of the dismountable disk drum type rotor; then, defining an index namely one normalized information entropy which can be used for quantifying the assembling loosening fault of the dismountable disk drum type rotor with the same scale; converting the obtained normalized information entropy into reliability R which serves as an evaluation index; quantitatively evaluating the assembling quality of the dismountable disk drum type rotor; and identifying the assembling loosening fault of the dismountable disk drum type rotor. The quantitative recognition method for the assembling loosening fault of the dismountable disk drum type rotor has the advantages of reliable result, good instantaneity and strong popularity, is simple and easy to realize and is suitable for monitoring the assembling quality of the dismountable disk drum type rotor in field; and by using the method, the assembling quality of the operation reliability of the dismountable disk drum type rotor can be improved.
Description
technical field [0001] The invention belongs to the field of mechanical fault diagnosis, and in particular relates to a quantitative identification method for a loose assembly fault of a detachable disc-drum rotor. Background technique [0002] The detachable disc-drum rotor refers to the structure in which the independent discs are pressed together by tie rod bolts to form a whole rotor. It has become a The rotor structure is widely used in large power equipment such as gas turbines and aero engines. [0003] At present, there are few studies on detachable disc-drum rotors at home and abroad, and most of them are still treated as a whole segment or a set of continuous rotors, ignoring the contact effect between the discs and between the tie rod bolts and the discs, or simply using the modified The method of stiffness coefficient is used to deal with it, and there is a lack of reasonable and effective mechanical model. Due to the contact effect between the discs and the ti...
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IPC IPC(8): G01M13/00
Inventor 何正嘉张小丽陈雪峰訾艳阳张周锁李兵曹宏瑞
Owner XI AN JIAOTONG UNIV