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

A technology of pulse detonation and dynamic calibration, applied in the direction of measuring device, force/torque/work measuring instrument calibration/test, instrument, etc., it can solve the problem that the test system cannot be calibrated, the overshoot is small, and the thrust test system cannot be calibrated. Problems such as short adjustment time

Inactive Publication Date: 2018-12-21
NORTHWESTERN POLYTECHNICAL UNIV
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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

Method used

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

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Embodiment Construction

[0025] Now in conjunction with the accompanying drawings, the present invention will be further described:

[0026] combine figure 1 , figure 2 , image 3 and Figure 4 The invention provides a dynamic calibration method and device for the thrust test of a test bed of a pulse detonation engine. figure 1 The schematic diagram of the dynamic calibration system for the thrust test of the pulse detonation engine, figure 2 is the schematic diagram of the dynamic calibration system, image 3 is the amplitude ratio curve obtained by the test system, Figure 4 The phase difference curve obtained for the test system.

[0027] according to figure 2 As shown, the electrodynamic vibration exciter (3) is used as the actuator, and the trapezoidal signal generator is used to generate an electric signal close to the thrust waveform of the pulse detonation engine, which is amplified by the power amplifier and then input to the vibration exciter (3). The vibration exciter (3) convert...

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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...

Claims

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Application Information

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IPC IPC(8): G01L25/00
CPCG01L25/00
Inventor 范玮王云黄成金宋亚恒何建男
Owner NORTHWESTERN POLYTECHNICAL UNIV
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