Aero-engine vibration signal phase measurement method based on revolving speed pulse reconstruction

An aero-engine and vibration signal technology, applied in measurement devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems affecting interpolation accuracy, affecting phase estimation accuracy, limited accuracy, etc., to achieve stable and accurate signal phase, suitable for Real-time implementation and small computational effort

Active Publication Date: 2015-06-03
AVIC NO 631 RES INST
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Problems solved by technology

The method of changing the sampling rate in real time is realized by controlling the actual sampling rate through the speed information. It is a dynamic balance process with limited precision; the method of digital signal interpolation is relatively easy to implement. When the speed reaches dynamic balance, its precision is high. However, when the speed changes greatly and dynamically, the number of points that need to be interpolated becomes larger, which will affect the interpolation accuracy, thereby affecting the estimation accuracy of the phase

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  • Aero-engine vibration signal phase measurement method based on revolving speed pulse reconstruction
  • Aero-engine vibration signal phase measurement method based on revolving speed pulse reconstruction
  • Aero-engine vibration signal phase measurement method based on revolving speed pulse reconstruction

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[0046] The present invention proposes an aeroengine vibration signal phase measurement method based on rotational speed pulse reconstruction. The content and effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] refer to figure 2 , the vibration signal phase method includes the following steps:

[0048] Step 1, monitor the speed pulse, and calculate the period T of the speed pulse at the current moment according to the following formula k ,

[0049] T k =t k -t k-1 1)

[0050] Among them, tk is the moment corresponding to the kth rising edge of the speed pulse, k=1,2,3,..., indicating the sequence number of the rising edge;

[0051] Step 2, calculate the vibration signal in the speed pulse period T k The number of points in the collected data, denoted as N k , and record the vibration signal in this period as S k (t), t k-1 k ;

[0052] Step 3, combined with the sampling rate in the actual sys...

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Abstract

The invention discloses an aero-engine vibration signal phase measurement method based on revolving speed pulse reconstruction and mainly solves the problem that the phase measurement error is large and the phase measurement is unstable in the prior art. The measurement method comprises the steps that two paths of orthorhombic reference signals are reconstructed in local, and the phase of the vibration signal is estimated through an angle measurement algorithm. The aero-engine vibration signal phase measurement method based on revolving speed pulse reconstruction has the advantages of small computational burden, good stability and high speed measurement accuracy, and can be applicable to precisely measuring the phase of the vibration signal of an aero-engine.

Description

technical field [0001] The invention belongs to the technical field of aero-engine vibration monitoring, and specifically relates to a method for measuring the phase of vibration signals of an aero-engine, which is used for stably and accurately realizing the measurement of the phase of the vibration signal in a complex vibration environment when the aero-engine runs at high speed. Background technique [0002] At present, vibration signal analysis is an effective method for diagnosing aeroengine faults, and most structural strength faults are closely related to vibration signals. Engine vibration monitoring is an important part of condition monitoring and fault diagnosis. Through related sensors, various vibration signals of the engine can be collected, and through real-time detection of parameters such as the amplitude, vibration intensity, and phase of the vibration signal, combined with the inherent characteristics of the vibration signal, the operation of the engine can...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 张蕾赵小勇毛宁徐杰唐甜
Owner AVIC NO 631 RES INST
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