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Aero-engine rotor-stator rubbing position identification method based on application of cepstrum

An aero-engine and cepstrum technology, which is applied in the direction of engine testing, machine/structural component testing, measuring devices, etc., can solve problems such as inconvenient use on site, acoustic emission technology is easily affected by noise, and affects positioning accuracy, etc., to achieve The effect of simple and convenient on-site use, low additional cost, and strong anti-interference ability

Active Publication Date: 2013-06-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] However, acoustic emission technology is extremely susceptible to noise, and its characteristic parameters often cannot reflect the real state of the equipment, thus affecting the positioning accuracy. Moreover, acoustic emission technology requires special equipment and instruments, which is not convenient for on-site use
However, the method based on the finite element model has a huge amount of calculation and is not suitable for on-site real-time monitoring, and whether the finite element model can be correctly established is very dependent on the engineering

Method used

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  • Aero-engine rotor-stator rubbing position identification method based on application of cepstrum
  • Aero-engine rotor-stator rubbing position identification method based on application of cepstrum
  • Aero-engine rotor-stator rubbing position identification method based on application of cepstrum

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Experimental program
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Embodiment Construction

[0032] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0033] This test uses the figure 1 The shown aero-engine rotor tester realizes rubbing test. In terms of the structural design of the tester, it is first considered that the shape is consistent with the casing of the core machine of the aero-engine, and the size is reduced by three times; The adjustable stiffness support structure is designed to adjust the dynamic characteristics of the system; the multi-stage compressor is simplified to a single-stage disk structure, and a rotor-support-blask-casing system is formed structurally. The tester can realize different degrees of rubbing by adjusting the rubbing bolt 4 to squeeze the rubbing ring 1 .

[0034] In each experiment of this embodiment, four rubbing screws are designed at the turbine case to realize rubbing experiments at four parts. The rubbing position is based on facing the turbine casing as a standard,...

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Abstract

The invention discloses an aero-engine rotor-stator rubbing position identification method based on the application of cepstrum and belongs to the technical field of aero-engine fault diagnosis. According to the method, first, aeroengine case vibration acceleration signals of different rubbing positions of an aero-engine are obtained; next, by means of the cepstrum analytical method, Low-dimensional feature parameters are extracted, and training samples are formed; then, training is carried out on a training sample set by means of sorting algorithms, and a rubbing position sorter is obtained; last, rubbing positions are identified with the trained sorter. Only with an acceleration sensor, can rubbing positions of the aero-engine be effectively identified. Compared with the prior art, the method is simple and suitable for real-time diagnosis in the field.

Description

technical field [0001] The invention discloses a method for using cepstrum to identify the rotating and static rubbing parts of an aero-engine, and belongs to the technical field of aero-engine fault diagnosis. Background technique [0002] Rotary-static rubbing fault is a common strong nonlinear fault of high-speed rotating machinery including aeroengines, which is seriously harmful and will lead to increased rotational-static gap, bearing wear, increased vibration, blade breakage and even mechanical failure. In modern large-scale aero-engines, the main causes of rubbing come from unbalanced rotor, deformation of casing, and misalignment of supports. Due to the large mass of the rotor, the casing generally adopts a thin-walled structure, which is light in weight, and it is difficult for the rotor to bounce back due to friction. Therefore, in aero-engines, the rubbing phenomenon is mainly manifested as eccentric wear, that is, rubbing is basically at the fixed position of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00
Inventor 陈果于明月李爱姜广义李成刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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