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A modified helicopter model dynamic balance adjustment phase calculation method

A helicopter model and phase calculation technology, applied in static/dynamic balance testing, machine/structural component testing, instruments, etc., can solve problems such as inaccurate phase adjustment calculations, reduce vibration levels, ensure test safety, The effect of eliminating interference factors

Active Publication Date: 2019-05-31
CHINA HELICOPTER RES & DEV INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This method can effectively overcome the inaccurate calculation of the phase adjustment caused by different sensors and collectors and the interference of the use environment, and establish a set of calculation methods for the dynamic balance adjustment phase of the helicopter model rotor with correction

Method used

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  • A modified helicopter model dynamic balance adjustment phase calculation method
  • A modified helicopter model dynamic balance adjustment phase calculation method
  • A modified helicopter model dynamic balance adjustment phase calculation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] In order to verify the effect of this method, three sets of vibration signal and speed signal data collected by the helicopter model rotor test bench data acquisition system and monitoring and alarm system are selected for calculation and comparison. The first set of data is the data collected by the data acquisition system, and the sampling rate is 2000 points / second; the second and third sets of data are the data collected by the monitoring and alarm system, and the sampling rate is 5000 points / second.

[0029] The implementation steps are as follows:

[0030] (1) Intercept the collected vibration signal and speed signal time history data. The length of the data intercepted by the first set of data is 10 seconds, and the starting point of the intercepted data is the rising edge of the speed; the length of the data intercepted by the second set of data is 10 seconds seconds, the starting point of the intercepted data is the rising edge of the speed; the length of the d...

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Abstract

The invention, which belongs to the helicopter model rotor wing test field, provides a correction-function-contained dynamic balance adjustment phase calculating method of a helicopter model. The method is characterized in that frequency spectrum calculation is carried out on a vibration signal and a rotating speed signal, wherein the signals are obtained by measurement; a reference frequency is obtained based on rotating speed conversion and an amplitude and phase corresponding to the reference frequency are taken out from the vibration and rotating speed frequency spectrum; a vibration phase is corrected by a rotating speed phase; and then calculation is carried out again to obtain an adjustment phase value needing to increase the balance weight. According to the invention, a problem of inaccurate adjustment phase calculation due to the different sensor and collector and the application environment interference can be solved. Therefore, the dynamic balance adjustment phase calculating method that is capable of realizing accurate calculation of the adjustment phase can be established.

Description

technical field [0001] The invention relates to a method for calculating the dynamic balance adjustment phase of a helicopter model with correction, which is used for calculating the phase adjustment of the dynamic balance adjustment of the helicopter model rotor and belongs to the field of helicopter model rotor tests. Background technique [0002] Helicopter model rotor dynamic balance adjustment phase calculation method is an important technology of helicopter model rotor test, and is the premise of dynamic balance adjustment. This method first calculates the frequency spectrum of the measured vibration signal, and obtains a reference frequency according to the conversion of the rotational speed, then extracts the amplitude and phase of the vibration signal corresponding to the reference frequency from the vibration spectrum, and then calculates the adjusted phase value that needs to be increased. . [0003] Due to the different performances of the rotating speed sensor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M1/38
Inventor 刘正江金小强陈焕孙伟陈卫星王江华
Owner CHINA HELICOPTER RES & DEV INST
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