Method for eliminating phase distortion caused by filter in ground flutter test

Abstract

The invention belongs to the technical field of signal processing, and particularly relates to a method for eliminating phase distortion caused by a filter in a ground flutter test. The method comprises the following steps: 1, constructing an aerodynamic force loading system model, determining an excitation point position and a corresponding vibration pickup point position of a test piece, installing a vibration exciter at the excitation point position of the test piece, and installing a sensor at the vibration pickup point position; 2, inputting a first excitation force signal measured by a sensor into a filter to obtain a filtered second excitation force signal, and inputting the second excitation force signal into the aerodynamic force loading system model for system identification; and3, constructing a controller model, and controlling an output signal of the aerodynamic force loading system model through the controller model, so that the output signal of the aerodynamic force loading system model is consistent with the target signal at a preset frequency point. According to the invention, the phase distortion of the filter can be eliminated, and the influence of high-frequency noise on aerodynamic calculation and flutter test can be effectively eliminated.

Description

Technical field [0001] The present application belongs to the field of signal processing, and in particular, it is particularly related to the elimination method of the filter causes phase distortion in the ground flush test. Background technique [0002] In the ground flux test, since the pneumatic reconstruction requires structural displacement, speed, and acceleration signal, the actual signal is low due to the lower signal signal to noise, and thus the measurement signal is often required to filter processing by the filter. [0003] Filters are typically used for signal test terminals, which are used to improve the quality and signal-to-noise ratio of the test signal, but the use of the filter is not significant, but it will significantly cause the phase movement of the signal, see attachment figure 1 Attach figure 2 In the conventional vibration test and control, the phase movement does not cause a change in the results, but for the ground flutter test system, the response s...

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a method for eliminating phase distortion caused by filters in ground flutter tests, so as to solve at least one problem existing in the prior art

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