Airborne vibration signal processing method for large-bypass-ratio turbofan engine

Abstract

The invention discloses an airborne vibration signal processing method for a large-bypass-ratio turbofan engine, and the method comprises the steps: 1, monitoring a rotating speed high-tooth signal, and calculating a high-tooth signal period at a current moment according to the rotating speed; step 2, in a high-tooth signal period, collecting and marking the point number of the collected vibration signal data, and marking vibration signals in the high-tooth signal period; 3, according to the A/D sampling frequency and the frequency resolution, the number of vibration points needed by cubic spline interpolation of the collected vibration signals in the high-tooth signal period is calculated, and a sampling point number sequence of the vibration signals is obtained; 4, filtering high-frequency components of the sampling point number sequence of the vibration signals through a low-pass filter, and obtaining a filtering point number sequence of the vibration signals after filtering; and step 5, performing cross-correlation processing on the filtering point number sequence of the vibration signal to obtain the amplitude and the phase of the vibration signal in a high-tooth signal period.

Description

Technical field [0001] The present invention relates to but is not limited to, in the field of aero-engine vibration monitoring, specifically, a method of controlling a large number ratio vortex engine airborne vibration signal processing method. Background technique [0002] The vibration signal is one of the important signals that reflect the operating state of the engine, and the vibration signal contains a large number of operating status information. [0003] At present, vibration signal processing is an effective method for diagnosing aero-engine failure. Most structural strengths have a close relationship with vibration signals. Therefore, engine vibration monitoring is an important part of state monitoring and fault diagnosis. Through the associated sensor, various vibration signals can be collected, by the real-time detection of the vibration signal, the vibration intensity, the phase, etc. There is a loss to enterprises. Therefore, the spectral information of the vibrat...

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is: the embodiment of the present invention provides a large bypass ratio turbofan engine airborne vibration signal processing method to solve the existing vibration signal processing method, due to the way of randomly collecting vibration signals at equal time intervals Sampling, the intercepted discrete signal generally does not meet the whole cycle condition, which will cause large errors, spectral leakage and fence effect, which will affect the accuracy of vibration analysis

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