CN108398228A - A kind of air-flotation type strain balance - Google Patents

A kind of air-flotation type strain balance Download PDF

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Publication number
CN108398228A
CN108398228A CN201711445475.1A CN201711445475A CN108398228A CN 108398228 A CN108398228 A CN 108398228A CN 201711445475 A CN201711445475 A CN 201711445475A CN 108398228 A CN108398228 A CN 108398228A
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China
Prior art keywords
component
axial force
measuring cell
mandrel
force
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CN201711445475.1A
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CN108398228B (en
Inventor
陈丁
王苏宁
余奕甫
马洪强
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China Academy of Aerospace Aerodynamics CAAA
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China Academy of Aerospace Aerodynamics CAAA
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/06Measuring arrangements specially adapted for aerodynamic testing
    • G01M9/062Wind tunnel balances; Holding devices combined with measuring arrangements

Abstract

The invention discloses a kind of air-flotation type strain balances; the balance is combined type balance; including mandrel, axial force component, five component components, protective case; the mandrel includes taper connection section and equal straight sections; the mandrel is installed with the cooperation of axial force component, and axial force component and the cooperation of five component components are installed, and axial force component fixing end is fixed with mandrel; its movable end is fixed with five component component fixing ends, and five component component movable ends are fixed with tested model.The axis, axial force component and five component components are coaxial.Compressed gas is filled with from mandrel fixing end, make to form air-bearing because being full of compressed gas between axial force component movable end and mandrel by the stomata of mandrel front end, the frictional resistance between axial force component and mandrel can be made to ignore, improve the measurement sensitivity and precision of axial force.

Description

A kind of air-flotation type strain balance
Technical field
The present invention relates to a kind of air-flotation type strain balances, belong to aerospace dynamometer check aerodynamics force measurement field, especially Suitable for it is sub-, across, supersonic speed high-precision drag measurement wind tunnel test.
Background technology
Wind tunnel test is research means crucial in flight shape design for aerocraft, and height is obtained during wind tunnel test The aerodynamic data of precision must have high-precision aerodynamics force measurement balance, for general aircraft measurement balance, axis Relative to the power on other directions it is one a small amount of to power (X-component), is an amount for being most difficult to measure in aerodynamics force measurement, to survey The variation for measuring aircraft shape is even more extremely difficult corresponding to the variable quantity of axial force.Six components of traditional strain balance are at one On measuring cell, axial force full scale should become smaller when measurement, other pneumatic force components are more than the interference deformation of axial force axial The principal strain of power component, other components are also big to the interference coefficient of axial force when static calibration of balance, cause balance axial force measuration smart Degree is difficult to improve.
Invention content
The technology of the present invention solves the problems, such as:A kind of air-flotation type strain balance has been overcome the deficiencies of the prior art and provide, it can The load of side force, normal force, pitching moment, rolling moment, yawing is set to be directly delivered on mandrel, without to axial force Load has an impact, and improves signal-to-noise ratio and the sensitivity of axial force measuration, realizes the high-acruracy survey of axial force.
Technical solution of the invention is:A kind of air-flotation type strain balance, the balance include mandrel and for measuring axis To the axial force component of power, one end of mandrel is sleeved on axial force component internal, and company is fixed in middle part and the end of axial force component It connects, the other end stretches out outside axial force to be fixedly connected with test bracket, and the mandrel is internally provided with hollow via-hole, and the hollow via-hole It being blocked positioned at the end of axial force component internal, another end opening, mandrel side wall is connected equipped with multiple stomatas with hollow via-hole, Compressed gas is filled with along mandrel hollow via-hole, forms suspension between axial force component and mandrel because being full of compressed gas, axial Power component is for measuring axial force.
The mandrel includes taper connection section and waits straight sections, and straight sections is waited to fix company close to cone section position and axial force component It connects, taper connection section is connect with test bracket by cone match, and chock is used in combination to tense.
The axial force component measures axial force by axial force measuration element, and the axial force measuration element is mounted on axis On vertical girder structure on the side wall of power component, plane is perpendicular to the axial force component where axial force measuration element Axis.
Above-mentioned air-flotation type strain balance further includes for measuring side force, normal force, pitching moment, rolling moment, yaw forces Five component components of square, axial force assembly set is in five component component internals, and five component assembly sets are inside tested model;Five components One end of component is fixedly connected with tested model, the end that the other end is fixedly connected with the axial force component of set inside it with mandrel The opposite other end in portion is fixedly connected, compressed gas after mandrel hollow via-hole is filled with, axial force component and five component components it Between also form suspension because being full of compressed gas, five component components measure side force, normal force, pitching moment, rolling moment, yaw The load of axial force is not had an impact when torque.
The mandrel, axial force component and five component component coaxial placements.
The five components component is fixed with tested model by pin;The five components component passes through pin with axial force component Nail is fixed;The axial force component is fixed with mandrel by pin.
The five components component passes through side force measuring cell, normal force measuring cell, pitching moment measuring cell, rolling power Square measuring cell and yawing measuring cell measure side force, normal force, pitching moment, rolling moment, yawing, side respectively Power measuring cell, normal force measuring cell, pitching moment measuring cell, rolling moment measuring cell and yawing measuring cell On multiple rectangular beams, mounting surface is parallel to five component arrangement axis.
The mounting surface of the pitching moment, normal force and rolling moment measuring cell be located across five component arrangement axis and In the plane vertical with five component module transverse sections, pitching moment measuring cell, normal force measuring cell and rolling moment measure Element is 1 pair, and each pair of pitching moment measuring cell, normal force measuring cell and rolling moment measuring cell are both with respect to five points Measure axisymmetrical arrangement;Yawing element, side force measuring cell are arranged in be measured with pitching moment, normal force and rolling moment In the perpendicular plane of element, yawing measuring cell, normal force measuring cell are 1 pair, and each pair of yawing measures member Part, normal force measuring cell are arranged relative to five component axisymmetricals.
The mandrel interior parallel is in axis and avoids the position of stomata and through-hole and is furnished with multiple outlet holes, is used for axial force Measuring cell, side force measuring cell, normal force measuring cell, pitching moment measuring cell, rolling moment measuring cell and yaw Torgue measurement element outlet.
Above-mentioned air-flotation type strain balance further includes protective case, and protective case is fixed with five component component fixing ends, covered all Measuring cell, outer surface are parallel with five component module outer surfaces.
The present invention has the following advantages that compared with prior art:
(1), the present invention is designed strain balance using pneumatically supported principle is formed inside balance unit by compressed gas At combined type sleeve structure, axial force measuration element is arranged with other power (side force, normal force, pitching power, rolling power, yaw forces) On two different casings, compressed gas is filled with from mandrel fixing end, the stomata very little of pressure release, ensures axial force component fixing end Suspension is generated because being full of compressed gas between mandrel, between five component components and axial force component, this structure can make axis The load for not undertaking the power on other directions in addition to its measurement in wind tunnel test to five component component of power component, can make other four Load on a component is directly delivered on mandrel, is had an impact without the load to axial force, is improved axial force measuration The high-acruracy survey of axial force is realized in signal-to-noise ratio and sensitivity.
Description of the drawings
Fig. 1 is a kind of air-flotation type strain balance assembling schematic diagram of the embodiment of the present invention;
Fig. 2 is a kind of air-flotation type strain balance assembling section of the embodiment of the present invention;
Fig. 3 (a) is the structural schematic diagram of mandrel of the embodiment of the present invention;
Fig. 3 (b) is the cross-sectional view of the structure of mandrel of the embodiment of the present invention;
Fig. 4 is the structural schematic diagram of axial force component of the embodiment of the present invention;
Fig. 5 is the structural schematic diagram of five component component of the embodiment of the present invention;
Fig. 6 is the structural schematic diagram of protective case in the present invention;
In figure:1, mandrel;2, axial force component;3, five component component;4, protective case;5, axial force measuration element;6, it bows Face upward torgue measurement element;7, normal force measuring cell;8, rolling moment measuring cell;9, yawing measuring cell;10, lateral Power measuring cell.
Specific implementation mode
Just the present invention is described further in conjunction with attached drawing below.
As shown in Figure 1 and Figure 2, a kind of air-flotation type strain balance provided by the invention be combined type balance, including protective case 4, Mandrel 1, the five component components 3 for measuring side force, normal force, pitching moment, rolling moment, yawing, for measuring axis To the axial force component 2 of power, five component components 3 are sleeved on inside tested model, and axial force component 2 is sleeved on inside five component components 3, One end of mandrel 1 is sleeved on inside axial force component 2, and the other end stretches out outside axial force component 2.One end of five component components 3 with Tested model is fixedly connected, and the other end is fixedly connected with the axial force component 2 of set inside it with one end, axial force component 2 The other end is fixedly connected with 1 middle part of mandrel, and the end that mandrel 1 stretches out axial force component external is fixedly connected with test bracket, institute State 3 coaxial placement of mandrel 1, axial force component 2 and five component components.
As shown in Fig. 3 (a) and Fig. 3 (b), the mandrel 1 includes taper connection section and equal straight sections, taper connection section and test Fixing end is used in combination chock to tense by cone match, and straight sections fixing end is waited to be connected with axial force component 2 by pin;The core Axis 1 is internally provided with hollow via-hole, and the hollow via-hole is located at the end of axial force component internal and is blocked with jackscrew, and the other end is opened Mouthful, 1 side wall of mandrel is connected equipped with multiple stomatas with hollow via-hole, and compressed gas is passed through from taper connection segment trailer, is passed through The stomata of straight section front end is fed gas into inside whole device, between axial force component and mandrel 1 and axial force component and five points Suspension is formed because being full of compressed gas between amount component 3.Above-mentioned air-bearing structure can make axial force component and mandrel it Between frictional resistance ignore, five component components 3 measure side force, normal force, pitching moment, rolling moment, yawing when The load of axial force is not had an impact, for general strain balance, the load on other four components can be made direct It is transmitted on mandrel, is had an impact without the load to axial force, improve signal-to-noise ratio and the sensitivity of axial force measuration, realize The high-acruracy survey of axial force.
In addition, 1 interior parallel of the mandrel is in axis and avoids the position of stomata and through-hole and is furnished with multiple outlet holes, it is used for Axial force measuration element, side force measuring cell, normal force measuring cell, pitching moment measuring cell, rolling moment measuring cell With yawing measuring cell outlet.
The axial force component 2 measures axial force by axial force measuration element.Fig. 4 is the structural representation of axial force component Figure, as shown in figure 4, the axial force component 2 is hollow cylindrical, the axial force measuration element 5 is mounted on axial force component Side wall on vertical girder structure on, plane where axial force measuration element is led to perpendicular to the axis of the axial force component 2 It crosses parallelogram sturcutre power transmission and measures axial force.
The five components component 3 is fixed with tested model by pin;The five components component 3 is logical with axial force component 2 Pin is crossed to fix;The axial force component 2 is fixed with mandrel 1 by pin.
The five components component 3 passes through side force measuring cell, normal force measuring cell, pitching moment measuring cell, rolling Torgue measurement element and yawing measuring cell measure side force, normal force, pitching moment, rolling moment, yawing respectively, Side force measuring cell, normal force measuring cell, pitching moment measuring cell, rolling moment measuring cell and yawing measure member Part is mounted on multiple rectangular beams, and mounting surface is parallel to five component components, 3 axis.
The mounting surface of the pitching moment, normal force and rolling moment measuring cell be located across five component arrangement axis and In the plane vertical with five component module transverse sections, pitching moment measuring cell, normal force measuring cell and rolling moment measure Element is 1 pair, and each pair of pitching moment measuring cell, normal force measuring cell and rolling moment measuring cell are both with respect to five points Measure axisymmetrical arrangement;Yawing, normal force measuring cell are arranged in measures member with pitching moment, normal force and rolling moment In the perpendicular plane of part, yawing measuring cell, normal force measuring cell are 1 pair, each pair of yawing measuring cell, Normal force measuring cell is arranged relative to five component axisymmetricals.
Fig. 5 is the structural schematic diagram of five component components.As shown in figure 5, the five components component 3 is hollow cylindrical, side Power measuring cell, normal force measuring cell, pitching moment measuring cell, rolling moment measuring cell and yawing measuring cell Along the directional spreding parallel with five component axis on five component components, 3 side wall.About the 3 five components component is respectively furnished with monolithic Rectangular beam, single, rectangular piece beam section broadside extended line is vertical with by five component arrangement axis, broadside and five component arrangement axis Vertically, plane where single, rectangular piece deck-siding side places pitching moment measuring cell 6, normal force measuring cell 7 for measuring pitching Torque, normal force, plane where narrow side places rolling dress torgue measurement element 8, for measuring rolling moment.Left and right is furnished with three-chip type Rectangular beam places yawing 9 and side force measuring cell 10, for measuring yaw forces on the outside of five component component of intermediate beam upper edge Square and side force.
Protective case 4 is fixed with five component components, 3 fixing end, covers all side force elements, outer surface and five component components 3 Outer surface is parallel.Fig. 6 is protective case structural schematic diagram, and the protective case is fastened with five component components 3 with screw, is surveyed for protecting Measure element.
Operation principle:The air-flotation type high-precision axial force strain balance mandrel 1, axial force component 2, five component components 3, 4 coaxial cooperation of protective case is installed, and 1 fixing end of mandrel is fixed on test bracket, and five component component movable ends are solid with tested model Even, the aerodynamic force that model tested in this way is born passes to five component components 3, and aerodynamic force is passed to axial direction by five component components 3 again Aerodynamic force is transmitted on holder by power component 2, axial force component 2 by being fixed with mandrel 1;By to 1 fixing end of mandrel is filled Enter compressed gas, can make to be formed because being full of compressed gas between mandrel 1, axial force component 2, five component components 3, tested model It suspends, does not generate and influence each other, under this assembling structure, a whole set of balance can be realized to acting on the aerodynamic load on model The accurate measurement of 6 components, especially can have higher measurement accuracy to axial force.
The measuring cell of axial force component 2 is axial force measuration element 5, and on 2 side wall of axial force component, structure is using vertical Beam type measures axial force by parallelogram sturcutre power transmission;The measuring cell of five component components 3 includes pitching moment 6, normal direction Power 7,10 measuring cell of rolling moment 8, yawing 9 and side force, are respectively positioned on five component components, 3 side wall, wherein pitching moment 6, normal force 7 and 8 measuring cell of rolling moment are two groups of single, rectangular piece beams, arrangement symmetrical above and below;Yawing 9 and side force 10 are Two groups of three-chip type rectangular beams, are symmetrically arranged.Strain size by measuring six different measuring cells, which measures, is tested model Power on suffered six direction and torque.
Unspecified part of the present invention belongs to common sense well known to those skilled in the art.

Claims (10)

1. a kind of air-flotation type strain balance, it is characterised in that:Axial force component including mandrel (1) and for measuring axial force (2), one end of mandrel (1) is sleeved on axial force component (2) inside, and middle part is fixedly connected with the end of axial force component (2), separately One end is stretched out outside axial force to be fixedly connected with test bracket, and the mandrel (1) is internally provided with hollow via-hole, and the hollow via-hole position It is blocked in the end of axial force component internal, another end opening, mandrel (1) side wall is equipped with multiple stomatas and hollow via-hole phase Even, compressed gas is filled with along mandrel (1) hollow via-hole, is formed between axial force component and mandrel (1) because being full of compressed gas It suspends, axial force component is for measuring axial force.
2. a kind of air-flotation type strain balance according to claim 1, it is characterised in that:The mandrel (1) includes that taper connects It connects section and waits straight sections, wait straight sections to be fixedly connected with axial force component (2) close to cone section position, taper connection section is logical with test bracket Cone match connection is crossed, chock is used in combination to tense.
3. a kind of air-flotation type strain balance according to claim 1, it is characterised in that:The axial force component (2) passes through Axial force measuration element measures axial force, and the axial force measuration element is mounted on the vertical beam type on the side wall of axial force component In structure, axis of the plane perpendicular to the axial force component (2) where axial force measuration element.
4. a kind of air-flotation type strain balance according to claim 1, it is characterised in that:Further include for measuring side force, normal direction Five component components (3) of power, pitching moment, rolling moment, yawing, axial force component (2) are sleeved in five component components (3) Portion, five component components (3) are sleeved on inside tested model;One end of five component components (3) is fixedly connected with tested model, the other end The other end opposite with the end that the axial force component (2) of set inside it is fixedly connected with mandrel (1) is fixedly connected, compressed gas Body is after mandrel (1) hollow via-hole is filled with, between axial force component (2) and five component components (3) also due to being full of compressed gas It is formed and is suspended, not to axial force when five component components (3) measure side force, normal force, pitching moment, rolling moment, yawing Load have an impact.
5. a kind of air-flotation type strain balance according to claim 4, it is characterised in that:The mandrel (1), axial force component (2) and five component component (3) coaxial placements.
6. a kind of air-flotation type strain balance according to claim 4, it is characterised in that:The five components component (3) and quilt Model is surveyed to fix by pin;The five components component (3) is fixed with axial force component (2) by pin;The axial force group Part (2) is fixed with mandrel (1) by pin.
7. a kind of air-flotation type strain balance according to claim 4, it is characterised in that:The five components component (3) passes through Side force measuring cell, normal force measuring cell, pitching moment measuring cell, rolling moment measuring cell and yawing measure member Part measures side force, normal force, pitching moment, rolling moment, yawing respectively, side force measuring cell, normal force measuring cell, Pitching moment measuring cell, rolling moment measuring cell and yawing measuring cell are mounted on multiple rectangular beams, mounting surface It is parallel to five component component (3) axis.
8. a kind of air-flotation type strain balance according to claim 7, it is characterised in that:The pitching moment, normal force and The mounting surface of rolling moment measuring cell is located across five component arrangement axis and the plane vertical with five component module transverse sections On, pitching moment measuring cell, normal force measuring cell and rolling moment measuring cell are 1 pair, and each pair of pitching moment measures Element, normal force measuring cell and rolling moment measuring cell are arranged both with respect to five component axisymmetricals;Yawing element, Side force measuring cell is arranged in the plane perpendicular with pitching moment, normal force and rolling moment measuring cell, yawing Measuring cell, normal force measuring cell are 1 pair, each pair of yawing measuring cell, normal force measuring cell, relative to five points Measure axisymmetrical arrangement.
9. a kind of air-flotation type strain balance according to claim 7, it is characterised in that:Mandrel (1) interior parallel in The axis and position for avoiding stomata and through-hole is furnished with multiple outlet holes, for axial force measuration element, side force measuring cell, normal direction Power measuring cell, pitching moment measuring cell, rolling moment measuring cell and yawing measuring cell outlet.
10. according to a kind of air-flotation type strain balance of claim 1~9 any one of them, it is characterised in that:It further include protective case (4), protective case (4) is fixed with five component component (3) fixing ends, covers all measuring cells, outer surface and five component components (3) outer surface is parallel.
CN201711445475.1A 2017-12-27 2017-12-27 Air-floating strain balance Active CN108398228B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110132526A (en) * 2019-05-29 2019-08-16 中国科学院力学研究所 A kind of low disturbing pulse type shock tunnel strain type face frictional resistance balance
CN110207944A (en) * 2019-06-26 2019-09-06 中国航天空气动力技术研究院 A kind of wind tunnel experiment high-precision resistance measurement method and device
CN110333120A (en) * 2019-07-24 2019-10-15 合肥工业大学 A kind of machine components cleannes rapid detection method and device
CN112461494A (en) * 2020-11-09 2021-03-09 中国空气动力研究与发展中心 Pulse combustion wind tunnel model support-balance integrated force measuring device

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CN105806586A (en) * 2016-05-11 2016-07-27 中国空气动力研究与发展中心超高速空气动力研究所 Small asymmetrical reentry body aerodynamic force measuring device supported by air bearing
CN205748868U (en) * 2016-05-11 2016-11-30 中国空气动力研究与发展中心超高速空气动力研究所 The little asymmetric reentry body aerodynamics force measurement device that a kind of air-bearing supports

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JP2011252830A (en) * 2010-06-03 2011-12-15 Toshiba Corp Support equipment for wind tunnel test model
CN102062630A (en) * 2010-12-06 2011-05-18 中国航天空气动力技术研究院 Floating frame type axial force strain balance
KR101250258B1 (en) * 2012-03-19 2013-04-05 국방과학연구소 Apparatus for measuring rotation velocity and method of measuring rotation velocity and wind tunnel testing machine having ratus for measuring rotation velocity
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Publication number Priority date Publication date Assignee Title
CN110132526A (en) * 2019-05-29 2019-08-16 中国科学院力学研究所 A kind of low disturbing pulse type shock tunnel strain type face frictional resistance balance
CN110207944A (en) * 2019-06-26 2019-09-06 中国航天空气动力技术研究院 A kind of wind tunnel experiment high-precision resistance measurement method and device
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CN110333120A (en) * 2019-07-24 2019-10-15 合肥工业大学 A kind of machine components cleannes rapid detection method and device
CN112461494A (en) * 2020-11-09 2021-03-09 中国空气动力研究与发展中心 Pulse combustion wind tunnel model support-balance integrated force measuring device
CN112461494B (en) * 2020-11-09 2022-09-02 中国空气动力研究与发展中心 Pulse combustion wind tunnel model support-balance integrated force measuring device

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