Prediction method for vibration signal stable value of wind tunnel balance

A vibration signal and prediction method technology, applied in informatics, special data processing applications, instruments, etc., can solve the problems of short effective time, large impact load, affecting the test accuracy of the balance, etc., and achieve the effect of improving the test accuracy

Active Publication Date: 2016-11-16
INHALE HYPERSONIC TECH RES CENT UNIT 63820 OF PLA
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Problems solved by technology

During the experiment, the start-up process of the wind tunnel will generate a large impact load, and the model will generate transient vibration under the impact load. Due to the short effective time of the experiment, the vibration cannot be completely attenuated, so it will affect the test of the balance. precision

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  • Prediction method for vibration signal stable value of wind tunnel balance
  • Prediction method for vibration signal stable value of wind tunnel balance
  • Prediction method for vibration signal stable value of wind tunnel balance

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Embodiment Construction

[0027] In order to understand the characteristics and technical content of the present invention in more detail, the implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] A method for predicting the stable value of vibration signal of wind tunnel balance. figure 1 Shown.

[0029] (1) From the perspective of multi-body dynamics, the wind tunnel test system is simplified into a multi-degree-of-freedom non-damping system composed of aircraft, frame, balance, and support. It is assumed that the signal measured by the balance is a signal synthesized by the system's forced vibration and free vibration. The system is simplified into a four-degree-of-freedom dynamic model. According to Newton's law, the dynamics modeling is performed on each degree of freedom. The formula is derived as follows:

[0030] m 1 x ·· 1 + ( c 1 + c 2 ) x · 1 - c 2 x · 2 ...

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Abstract

The invention provides a prediction method for a vibration signal stable value of a wind tunnel balance, and belongs to the technical field of signal analysis. The method comprises: 1, from many-body dynamics point of view, simplifying a system to a four-freedom-degree dynamical model, performing dynamics modeling on each degree of freedom; 2, preliminarily intercepting a segment of data from a balance measured signal, the data segment being divided into three processes of flow field, stable vibration, and smooth and steady state; 3, selecting signal troughs in the above data segment as starting time and cut-off time, so a truncated signal including multiple periods; 4, performing Fourier transform on the truncated signal, extracting main frequency of the signal; 5, after the main frequency is obtained, based on an attenuation function model obtained in the first step and a gradient descent method, fitting and predicting a truncated signal curve; 6, in order to realize automatic interception of a vibration signal period, and extracting the main frequency of the vibration signal, analyzing relations between a cycle number and signal precision. The method is mainly used for predicting a vibration signal stable value of a wind tunnel balance.

Description

Technical field [0001] The invention belongs to the technical field of vibration signal analysis, and particularly relates to the processing technology of the vibration signal of a wind tunnel balance. Background technique [0002] The wind tunnel laboratory is an experimental equipment for aerodynamic research of major equipment such as high-speed vehicles and aircraft. It is artificially generated and controlled to simulate the flow of air around the aircraft or other entities, and to measure the air flow. The effect of entities and a pipe-like device for observing physical phenomena is one of the most commonly used, most effective and indispensable tools for aerodynamic research. The wind tunnel balance is used to accurately measure the model aerodynamic force in the force measurement experiment, and it is closely related to the wind tunnel experiment technology. During the experiment, the starting process of the wind tunnel will produce a large impact load. The model will pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 刘伟雄姚磊张小庆吴颖川
Owner INHALE HYPERSONIC TECH RES CENT UNIT 63820 OF PLA
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