Dynamic calibration method and device for thrust test of pulse detonation engine test bed

Abstract

The invention provides a dynamic calibration method and a device for a thrust test of a pulse detonation engine test bed. The dynamic calibration method comprises the following steps of: applying a trapezoidal pulse force, which is similar to a thrust waveform of a pulse detonation engine, to a test system by using a vibration exciter; calibrating output of the test system by using impedance headoutput; when natural frequency of the test system is constant, driving the vibration exciter with different pulse frequencies, thereby obtaining output of the test system at different frequencies; obtaining amplitude ratios and phase differences at corresponding frequencies by using a transfer function and an autocorrelation functional method; and fitting and drawing an amplitude ratio and phase difference curve. According to the dynamic calibration method for the thrust test of the pulse detonation engine test bed, defects in dynamic calibration of a pulse detonation engine thrust testing system are remedied, system output obtained at certain test system natural frequencies and pulse detonation engine operating frequencies can be corrected according to the amplitude ratio and phase difference curve, and highly precise test results can be obtained.

Description

technical field [0001] The invention belongs to the field of engine testing, and in particular relates to a dynamic calibration method and device for thrust test of a pulse detonation engine test bench, which are mainly used for the thrust test and calibration of a pulse detonation engine test bench. Background technique [0002] At present, the principle of the traditional aero-engine thrust test device is to install the aero-engine on the moving frame, and then the whole moving frame is fixed to the top of the test room through several steel ropes of equal length, and the static position is installed at the same position as the moving frame. frame, and install a pressure sensor at the only contact force point between the moving frame and the stationary frame. The thrust test principle is mainly that when the engine is working, the generated thrust will push the moving frame to the direction of the stationary frame. When the work is stable, the thrust of the engine can be d...

AI Technical Summary

Problems solved by technology

However, pulse detonation engines that work intermittently and periodically require a short adjustment time and small overshoot of the thrust test system. Static calibration cannot calibrate whether the test system meets the test requirements of pulse detonation engines that work at different frequencies.

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