Method for time synchronization between free jet test measurement systems

Abstract

The invention relates to a method for time synchronization between free jet test measurement systems, belongs to the field of aircraft vibration measurement, and solves the problems of system complexity and high cost caused by the fact that each measurement system needs to receive a timing instruction for time synchronization between the measurement systems in the prior art. The method comprises the steps of arranging a plurality of vibration sensors and a plurality of noise sensors in a test piece, wherein each vibration sensor is connected to a vibration measurement system, each noise sensor is connected to a noise measurement system, and any one of the measurement systems is selected to be connected with a test bed controller; carrying out a free jet test on the test piece, sending a timing system instruction by a controller, receiving the instruction by a measurement system connected with the controller, and determining a timing system zero point according to the instruction; acquiring a vibration measurement curve and a noise measurement curve of each measurement system; determining the moment corresponding to the first peak value in a test recovery stage in each curve; and performing time synchronization on the measurement systems according to the first peak moment of the test recovery stage of each measurement curve.

Description

technical field [0001] The invention belongs to the field of aircraft vibration measurement, and in particular relates to a time synchronization method among free jet flow test measurement systems. Background technique [0002] Since the free-jet test can simulate the state of the engine in the real flight environment on the ground, the flight power unit, air intake, etc. will be tested by the high-altitude simulated free-jet test of the engine. [0003] In the free jet test, the vibration and noise environment are generally measured. Both vibration and noise environments need to be measured with a high sampling rate. The amount of measurement data is large, and multiple measurement systems are often used. The measurement data is generally as follows: figure 1 and figure 2 As shown, in order to facilitate the analysis, it is necessary to analyze the data measured by each measurement system using a unified time coordinate. Generally, each measurement system is used to coll...

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Problems solved by technology

[0004] In view of the above analysis, the embodiment of the present invention aims to provide a method for time synchronization between free jet test measurement systems, which is used to solve the problem of complex devices and test costs caused by the need for each measurement system to collect time system commands in the existing time synchronization method. high problem

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