CN111623954A - Wind tunnel balance bridge fault detection method - Google Patents

Wind tunnel balance bridge fault detection method Download PDF

Info

Publication number
CN111623954A
CN111623954A CN202010367404.XA CN202010367404A CN111623954A CN 111623954 A CN111623954 A CN 111623954A CN 202010367404 A CN202010367404 A CN 202010367404A CN 111623954 A CN111623954 A CN 111623954A
Authority
CN
China
Prior art keywords
balance
strain gauge
bridge
bridge arm
wind tunnel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010367404.XA
Other languages
Chinese (zh)
Other versions
CN111623954B (en
Inventor
吴凯
蒋坤
吴烈苏
闫万方
刘森
陈燕兵
冯江
龚晶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Academy of Aerospace Aerodynamics CAAA
Original Assignee
China Academy of Aerospace Aerodynamics CAAA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Academy of Aerospace Aerodynamics CAAA filed Critical China Academy of Aerospace Aerodynamics CAAA
Priority to CN202010367404.XA priority Critical patent/CN111623954B/en
Publication of CN111623954A publication Critical patent/CN111623954A/en
Application granted granted Critical
Publication of CN111623954B publication Critical patent/CN111623954B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
    • G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)

Abstract

The invention belongs to the technical field of wind tunnel testing, and provides a wind tunnel balance bridge fault detection method. The method comprises the steps of respectively measuring the resistance between every two outer leads of the four electric bridges in a normal state and after a fault of the balance, obtaining six equation sets according to a resistance calculation formula of a series-parallel circuit, solving a numerical solution of the nonlinear equation sets by using a least square method, obtaining the variation of a strain gage on each electric bridge in the normal state and after the fault of the balance, and determining the fault position of the electric bridges of the balance.

Description

Wind tunnel balance bridge fault detection method
Technical Field
The invention relates to a wind tunnel balance bridge fault detection method, and belongs to the technical field of wind tunnel tests.
Background
When the strain gauge is deformed by a load, a change in the electrical resistance is caused, which is converted into an electrical signal by the measuring bridge.
The measuring bridge used for the strain balance is a wheatstone bridge. The Wheatstone bridge of the strain balance generally adopts a direct-current power supply and supplies power with constant voltage, so that the resistance change value of the strain gauge is converted into a voltage change value. The Wheatstone bridge has the advantages of high sensitivity, wide measurement range, simple circuit structure, high measurement precision, easy compensation and the like.
Factors such as large impact on the balance in the temporary impact wind tunnel, large vibration amplitude and high frequency of a model balance system, overlarge load in the test process and the like can cause damage to a strain gauge on the balance bridge, for example, the factors such as unrecoverable damage of an adhesive layer or the strain gauge, quality of a welding spot, and reduction of the insulation degree of the whole bridge caused by the surface damage of an enameled wire are caused. The zero point of the balance is changed greatly and even exceeds the measuring range of the data acquisition system, so that the balance cannot accurately measure the load. When the balance bridge breaks down, the balance maintenance personnel need to check each position of the whole bridge one by one to determine the fault position, the work difficulty is high, the required time is long, and a large amount of valuable wind tunnel test time is occupied.
In order to solve the problems of high difficulty and low efficiency of detecting the balance bridge fault in the traditional mode, the wind tunnel balance bridge fault detection method provided by the invention realizes quick and accurate positioning of the balance bridge fault position.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the wind tunnel balance bridge fault detection method, which simplifies the fault troubleshooting mode and improves the efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: a wind tunnel balance bridge fault detection method is characterized in that the wind tunnel balance bridge comprises four bridge arms, and a strain gauge is pasted on each bridge arm; the method comprises the following steps:
when the balance is in a normal state, the balance body is connected with the ground by using a lead, and the resistance between every two of the four outer leads is measured; obtaining six equation sets according to a resistance calculation formula of the series-parallel circuit, and solving the numerical solution of the nonlinear equation sets to obtain the resistance value of the strain gauge on each bridge arm when the balance is in a normal state;
after the balance breaks down, the balance body is connected with the ground by using the lead wires, and the electric resistance value between every two of the four outer leads is measured; obtaining six equation sets according to a resistance calculation formula of the series-parallel circuit, and solving the numerical solution of the nonlinear equation sets to obtain the resistance value of the strain gauge on each bridge arm in the balance fault state;
and determining the bridge arm where the failed strain gauge is located according to the resistance value variation of each bridge arm strain gauge in the balance failure state and the balance normal state.
Preferably, the four outer leads of the balance are assumed to be a and b, c and d; the resistance across the outer leads a and b, a and c, a and d, b and c, b and d, c and d was measured as Rab、Rac、Rad、Rbc、Rbd、Rcd(ii) a Then according to the calculation formula of the series and parallel circuit resistance
Figure BDA0002477076050000031
Figure BDA0002477076050000032
Figure BDA0002477076050000033
Figure BDA0002477076050000034
Figure BDA0002477076050000035
Figure BDA0002477076050000036
Preferably, the numerical solution to the system of nonlinear equations is solved using a least squares method.
Furthermore, when a plurality of strain gauges are adhered to the failed bridge arm, each strain gauge on the bridge arm is disconnected from the bridge, and the specific resistance value of each strain gauge is measured independently, so that the failed strain gauge is determined.
Further, balance faults of the strain gauge with faults are eliminated through checking the quality of the strain gauge and a strain gauge pasting process.
The invention has the advantages that:
according to the method, the bridge arm where the failed strain gauge is located can be determined only by measuring the resistance value between every two of the four outer leads of the bridge when the balance is in a normal state and a failure state respectively and calculating the resistance value variation of the strain gauge on each bridge arm by utilizing the programmed calculation program, so that the trouble that maintenance personnel determine the bridge arm where the failed strain gauge is located by manually detecting each position of the whole bridge is avoided. The labor intensity of balance maintenance personnel is reduced, and valuable time is saved for wind tunnel tests.
Drawings
FIG. 1 is a schematic view of a typical conventional wind tunnel balance;
fig. 2 is a schematic circuit diagram of a wheatstone full bridge.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the invention provides a wind tunnel balance bridge fault detection method. As shown in fig. 1, a typical conventional wind tunnel balance with six components, that is, six bridges, includes a strain gauge 1, a connection terminal 2, a balance inner lead 3, a balance body 4, a balance outer lead 5, and resistance values. As shown in fig. 2, each bridge consists of four legs, each of which consists of several strain gauges, usually one or two, depending on the specific construction of the balance. When the balance bridge breaks down, balance maintenance personnel need to check each position of the whole bridge one by one to determine the fault position, and the balance maintenance personnel are limited by the working environment on the wind tunnel, so that the check difficulty is high, the time is long, and a large amount of precious wind tunnel test time is occupied.
The method comprises the steps of respectively measuring the resistance value between every two outer leads of the bridge when the balance is in a normal state and a fault state, solving the numerical value of a nonlinear equation set by using a least square method to obtain the resistance value variation of the strain gauge on each bridge arm, and determining the bridge arm where the strain gauge with the fault is located.
A wind tunnel balance bridge fault detection method comprises the following measurement principle and detection steps:
two of the balance external leads 5 are power lines which are used for being connected with a power supply during working, and the other two are signal lines which are used for being connected with a data acquisition system during working. When the balance is in a normal state, the balance body is connected with the ground by using the lead. As shown in FIG. 2, the resistances R across the outer leads a and b, a and c, a and d, b and c, b and d, c and d, respectively, were measuredab、Rac、Rad、Rbc、Rbd、Rcd. According to the calculation formula of the series and parallel circuit resistance
Figure BDA0002477076050000051
Figure BDA0002477076050000052
Figure BDA0002477076050000053
Figure BDA0002477076050000054
Figure BDA0002477076050000055
Figure BDA0002477076050000056
Solving the numerical solution of the nonlinear equation set by using a least square method, wherein the solving is realized on matlab, and the result is R1、R2、R3And R4The numerical solution of (c).
When the balance has faults, the balance body is connected with the ground by using the lead. The resistance R 'was again measured across the outer leads a and b, a and c, a and d, b and c, b and d, c and d, respectively'ab、R'ac、R'ad、R'bc、R'bd、R'cd. According to the calculation formula of series and parallel circuit resistance
Figure BDA0002477076050000061
Figure BDA0002477076050000062
Figure BDA0002477076050000063
Figure BDA0002477076050000064
Figure BDA0002477076050000065
Figure BDA0002477076050000066
Solving the numerical solution of the nonlinear equation system by using a least square method, and obtaining R as a result1'、R'2、R3'and R'4The numerical solution of (c).
The difference between the resistance value of each bridge after the fault and the resistance value of each bridge in the normal state is
ΔR1＝R'1-R1
ΔR2＝R'2-R2
ΔR3＝R'3-R3
ΔR4＝R'4-R4
When the resistance variation delta R of a certain strain gauge exceeds a reasonable variation interval specified by a manufacturer, the strain gauge which has a fault can be determined. The position of the strain gauge can be quickly found according to the number in advance, and the strain gauge is pasted again for replacement to eliminate the balance fault. And (4) eliminating balance faults of the faulty strain gauge by checking the mass of the strain gauge and a strain gauge pasting process.
The invention has not been described in detail in part in the common general knowledge of a person skilled in the art.

Claims (5)

1. A wind tunnel balance bridge fault detection method is characterized in that the wind tunnel balance bridge comprises four bridge arms, and a strain gauge is pasted on each bridge arm; the method is characterized by comprising the following steps:
when the balance is in a normal state, the balance body is connected with the ground by using a lead, and the resistance between every two of the four outer leads is measured; obtaining six equation sets according to a resistance calculation formula of the series-parallel circuit, and solving the numerical solution of the nonlinear equation sets to obtain the resistance value of the strain gauge on each bridge arm when the balance is in a normal state;
after the balance breaks down, the balance body is connected with the ground by using the lead wires, and the electric resistance value between every two of the four outer leads is measured; obtaining six equation sets according to a resistance calculation formula of the series-parallel circuit, and solving the numerical solution of the nonlinear equation sets to obtain the resistance value of the strain gauge on each bridge arm in the balance fault state;
and determining the bridge arm where the failed strain gauge is located according to the resistance value variation of each bridge arm strain gauge in the balance failure state and the balance normal state.
2. The method of claim 1, wherein: assuming that four external leads of the balance are a, b, c and d respectively; measurement of outer leads a andb. the resistances at the two ends of a and c, a and d, b and c, b and d, c and d are respectively Rab、Rac、Rad、Rbc、Rbd、Rcd(ii) a Then according to the calculation formula of the series and parallel circuit resistance
Figure FDA0002477076040000011
Figure FDA0002477076040000012
Figure FDA0002477076040000021
Figure FDA0002477076040000022
Figure FDA0002477076040000023
Figure FDA0002477076040000024
3. The method according to claim 1 or 2, characterized in that: and solving the numerical solution of the nonlinear equation system by using a least square method.
4. The method of claim 1, wherein: when a plurality of strain gauges are adhered to a failed bridge arm, each strain gauge on the bridge arm is disconnected from a bridge, and the specific resistance value of each strain gauge is measured independently, so that the failed strain gauge is determined.
5. The method of claim 4, wherein: and (4) eliminating balance faults of the faulty strain gauge by checking the mass of the strain gauge and a strain gauge pasting process.
CN202010367404.XA 2020-04-30 2020-04-30 Wind tunnel balance bridge fault detection method Active CN111623954B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010367404.XA CN111623954B (en) 2020-04-30 2020-04-30 Wind tunnel balance bridge fault detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010367404.XA CN111623954B (en) 2020-04-30 2020-04-30 Wind tunnel balance bridge fault detection method

Publications (2)

Publication Number Publication Date
CN111623954A true CN111623954A (en) 2020-09-04
CN111623954B CN111623954B (en) 2022-04-12

Family

ID=72259778

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010367404.XA Active CN111623954B (en) 2020-04-30 2020-04-30 Wind tunnel balance bridge fault detection method

Country Status (1)

Country Link
CN (1) CN111623954B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112504413A (en) * 2020-11-25 2021-03-16 西南科技大学 Full-digitalization conversion method and device for six-component balance bridge detection
CN117686178A (en) * 2023-11-20 2024-03-12 哈尔滨工业大学 Wind tunnel strain balance strain sensor fault diagnosis device and method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4956631A (en) * 1989-03-20 1990-09-11 Mitsubishi Denki Kabushiki Kaisha Fault detector for vehicle safety system
CN202649380U (en) * 2012-05-30 2013-01-02 上海电力学院 Digital cable insulation fault automatic locator
CN203164326U (en) * 2013-03-11 2013-08-28 唐山钢铁集团微尔自动化有限公司 Digital display type detection device of resistor strain sensor
CN103675606A (en) * 2013-12-07 2014-03-26 国家电网公司 Bridge type direct-current fault monitoring alarm
CN104880143A (en) * 2015-05-28 2015-09-02 西北工业大学 Bridge type resistor strain sensor multi-mode fault detection device
CN105891675A (en) * 2016-04-11 2016-08-24 中国石油大学(华东) Method of positioning insulated fault point of submersible oil cable in twice Wheatstone bridge method
CN106596035A (en) * 2016-12-07 2017-04-26 中国航天空气动力技术研究院 Device used for wind tunnel strain type balance state-of-health monitoring
CN108279347A (en) * 2018-02-24 2018-07-13 山东师范大学 A kind of terminal connections quality detection device and detection method based on ARM and electric bridge

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4956631A (en) * 1989-03-20 1990-09-11 Mitsubishi Denki Kabushiki Kaisha Fault detector for vehicle safety system
CN202649380U (en) * 2012-05-30 2013-01-02 上海电力学院 Digital cable insulation fault automatic locator
CN203164326U (en) * 2013-03-11 2013-08-28 唐山钢铁集团微尔自动化有限公司 Digital display type detection device of resistor strain sensor
CN103675606A (en) * 2013-12-07 2014-03-26 国家电网公司 Bridge type direct-current fault monitoring alarm
CN104880143A (en) * 2015-05-28 2015-09-02 西北工业大学 Bridge type resistor strain sensor multi-mode fault detection device
CN105891675A (en) * 2016-04-11 2016-08-24 中国石油大学(华东) Method of positioning insulated fault point of submersible oil cable in twice Wheatstone bridge method
CN106596035A (en) * 2016-12-07 2017-04-26 中国航天空气动力技术研究院 Device used for wind tunnel strain type balance state-of-health monitoring
CN108279347A (en) * 2018-02-24 2018-07-13 山东师范大学 A kind of terminal connections quality detection device and detection method based on ARM and electric bridge

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J.DOS REIS,ETAL: "Local validation of structural health monitoring strain measurements", 《MEASUREMENT》 *
杨双龙 等: "应变式多维力传感器的故障诊断方法与实现", 《电子测量与仪器学报》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112504413A (en) * 2020-11-25 2021-03-16 西南科技大学 Full-digitalization conversion method and device for six-component balance bridge detection
CN112504413B (en) * 2020-11-25 2022-03-22 西南科技大学 Full-digitalization conversion method and device for six-component balance bridge detection
CN117686178A (en) * 2023-11-20 2024-03-12 哈尔滨工业大学 Wind tunnel strain balance strain sensor fault diagnosis device and method

Also Published As

Publication number Publication date
CN111623954B (en) 2022-04-12

Similar Documents

Publication Publication Date Title
CN111623954B (en) Wind tunnel balance bridge fault detection method
CN102879697A (en) Optimized power transformer testing method
CN102519652A (en) Bolt pre-tightening force testing device and control method thereof
CN111060237A (en) Bridge circuit of force cell
CN108225628B (en) Method for measuring dynamic load of cushion pad of front cover of automobile
CN211477029U (en) Fiber grating strain sensor strain fatigue limit sensing life testing device
CN107014486B (en) Checking unit and method of power transmission line breeze vibration monitoring device
CN105203239A (en) Suspended unbalanced dynamic tension sensor
CN117308763A (en) High-temperature pipeline strain monitoring system and method
CN205879107U (en) Resistance strain sensor
CN208721292U (en) A kind of sensing element based on three beam types, six component torque sensor
CN109298311B (en) Strain balance detection circuit degradation and fault detection device
CN210833946U (en) Bridge circuit of force cell
CN112577649B (en) Wind power gear box bearing stress testing method
CN112213007A (en) Wireless monitoring method for tunnel primary support arch strain based on RFID technology
CN208282983U (en) The brake force system of high-precision disc braking formula force-measuring framework tests structure
CN103592471B (en) A kind of capacity measurement fixture
CN208443503U (en) The vertical load power system of high-precision class guide colume type force-measuring framework tests structure
CN217083645U (en) Bridge strain testing device
CN215492158U (en) Strain testing device for testing fatigue hot spot stress of steel bridge
CN214793555U (en) Resistance strain type pressure sensing and pressure-bearing eccentric detection combiner
CN109752672B (en) Clamping type magnetic flux sensor and application method thereof
CN218765715U (en) Dynamometer for eliminating azimuth error
CN213875988U (en) Fuse test accessory device of internal resistance tester
CN215415542U (en) PCBA test fixture

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant