Helicopter moving part vibration signal data quality calculation method

Abstract

The invention provides a helicopter moving part vibration signal data quality calculation method, and the method comprises the following steps: A, setting vibration sampling frequency and sampling time, and synchronously acquiring a vibration signal and a rotating speed signal; B, averagely dividing the vibration signal and the rotating speed signal into n sections, intercepting each section of vibration signal according to the synchronous rotating speed signal, and carrying out time domain average processing; C, performing FFT conversion on the n time domain synchronous average signals in sequence, and extracting amplitudes and phases of the n rotating speed same-frequency vibration signals; D, eliminating abnormal values of the amplitudes of the n rotating speed same-frequency vibrationsignals by utilizing a 3[delta] rule; E, calculating dynamic balance data quality according to the maximum value and the minimum value of the amplitude of the residual rotating speed same-frequency vibration signals; and F, if the mass of the dynamic balance data is smaller than the mass of the dynamic balance data, calculating the average value of amplitudes and phases of residual rotating speedsame-frequency vibration signals, otherwise, returning to the step A. The accuracy of the helicopter dynamic balance test result can be effectively improved, and the number of times of field dynamic balance adjustment is reduced.

Description

technical field [0001] The invention relates to the field of helicopter vibration health monitoring, in particular to a method for calculating the quality of vibration test signal data of a helicopter rotor system and transmission system. Background technique [0002] Helicopter moving parts mainly include main rotor, tail rotor, reducer, engine, transmission system, etc. The structural damage of various moving parts will directly and seriously affect the flight safety of the helicopter. Therefore, it is very important to monitor and evaluate the structural health of helicopter moving parts. significance. Structural damage or abnormality of helicopter moving parts generally manifests as abnormal vibration of each moving part of the helicopter. Vibration monitoring can accurately evaluate the health of moving parts. [0003] The balance test of helicopter moving parts mainly uses the simultaneous measurement of the speed signal and the vibration signal, and performs time-dom...

AI Technical Summary

Problems solved by technology

However, when the main rotor and tail rotor of the helicopter are running on the ground and flying in the air, due to the influence of the external airflow and the structure of the helicopter rotor system, the vertical vibration signal of the main rotor and the vibration signal of the tail rotor are actually non-stationary signals with amplitude changes. There are large deviations in the multiple measurement results calculated by the above method, and the on-site personnel cannot evaluate the accuracy of the test results, which leads to an increase in the number of dynamic balance adjustments of the main rotor and tail rotor

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