Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com