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A Fault Detection Method for Wind Tunnel Balance Bridge

A technology for wind tunnel balance and fault detection, which is applied to electromagnetic measuring devices, electric/magnetic solid deformation measuring, measuring devices, etc. It can solve problems such as low efficiency and difficult faults of balance bridges, so as to reduce labor intensity and save time Effect

Active Publication Date: 2022-04-12
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0005] In order to solve the problem of high difficulty and low efficiency in detecting balance bridge faults in traditional methods, a wind tunnel balance bridge fault detection method proposed by the present invention realizes fast and accurate positioning of balance bridge faults

Method used

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  • A Fault Detection Method for Wind Tunnel Balance Bridge
  • A Fault Detection Method for Wind Tunnel Balance Bridge
  • A Fault Detection Method for Wind Tunnel Balance Bridge

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing:

[0026] The invention provides a wind tunnel balance bridge fault detection method. Such as figure 1 As shown, it is a typical conventional wind tunnel balance with six components, that is, six bridges, including strain gauge 1, terminal 2, balance inner lead 3, balance body 4, balance outer lead 5 resistance values, etc. Such as figure 2 As shown, each bridge consists of four bridge arms, and each bridge arm is composed of several strain gauges, usually one or two, depending on the specific structure of the balance. When the balance bridge fails, the balance maintenance personnel need to check each position of the entire bridge one by one to determine the fault location. Due to the limitation of the working environment on the wind tunnel, the investigation is difficult, takes a long time, and takes up a lot of precious time. Wind tunnel test time.

[0027] This method ...

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Abstract

The invention belongs to the technical field of wind tunnel testing and provides a wind tunnel balance bridge fault detection method. By measuring the resistance between each of the four outer leads of the bridge when the balance is in normal state and after a fault occurs, six equations are obtained according to the calculation formula of series and parallel circuit resistance, and then the nonlinear equation is solved by the least square method The numerical solution of the group is obtained to obtain the change of the strain gauge on each bridge when the balance is normal and after a fault occurs, so as to determine the fault location of the balance bridge.

Description

technical field [0001] The invention relates to a wind tunnel balance bridge fault detection method, which belongs to the technical field of wind tunnel testing. Background technique [0002] When the strain gauge sheet is deformed after being loaded, it will cause a change in the resistance value, and this change in the resistance value will be converted into an electrical signal through the measuring bridge. [0003] The measuring bridge used in strain balances is the Wheatstone bridge. The Wheatstone bridge of the strain balance generally uses a DC power supply and a constant voltage power supply to convert the resistance change value of the strain gauge sheet into a voltage change value. The Wheatstone bridge has the advantages of high sensitivity, wide measurement range, simple circuit structure, high measurement accuracy and easy compensation. [0004] The impact of the balance in the temporary wind tunnel is large, the vibration amplitude and frequency of the model ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/06G01B7/16
CPCG01M9/062G01B7/18
Inventor 吴凯蒋坤吴烈苏闫万方刘森陈燕兵冯江龚晶
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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