CN112798215A - Air floatation supporting device of wind tunnel test measuring equipment - Google Patents
Air floatation supporting device of wind tunnel test measuring equipment Download PDFInfo
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- CN112798215A CN112798215A CN202011596109.8A CN202011596109A CN112798215A CN 112798215 A CN112798215 A CN 112798215A CN 202011596109 A CN202011596109 A CN 202011596109A CN 112798215 A CN112798215 A CN 112798215A
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- 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
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Abstract
The invention relates to an air floatation supporting device of a wind tunnel test measuring device, which comprises a platform assembly, an air floatation block and an air floatation screw rod. The high-pressure air sprayed by the air floating device supports the object to be tested and the floating frame, so that the additional interference load caused by the mechanical connection of the floating frame and the fixed frame is avoided, the small-load measurement precision is improved, and the air floating device can be applied to wind tunnel test.
Description
Technical Field
The invention belongs to the field of force measuring devices, relates to a frictionless supporting device, and particularly relates to an air floatation supporting device of wind tunnel test measuring equipment.
Background
In a wind tunnel force measurement test, a plurality of large-scale heavy-load models (with the magnitude of 10m and the weight of below 1000 kg) are required to measure micro aerodynamic force values (within 100N). In order to be able to withstand the weight and large-scale installation of the model, a large frame with satisfactory structural rigidity needs to be designed to withstand. If the frame structure adopts an integral balance measuring technology, the requirement of measuring precision is difficult to meet, so that a split type measuring device is mostly adopted and generally comprises a fixed frame, a floating frame, a frame connecting device, a force transmission device and the like. In order to obtain a more accurate measurement of the minor resistance, the frame connecting device needs to be provided with flexible devices to eliminate mutual interference, and these flexible devices are usually in a hinge type, a spring plate type, etc., and can inhibit interference in other directions in the flexible direction. The flexible device forms mechanical connection between the upper frame and the lower frame, in order to meet the requirement of the weight direction, the hinge and the spring plate need a certain thickness to meet the strength requirement, so the flexible direction necessarily generates restoring force, the restoring force is interference load to the other direction, if the load force value which needs to be measured is smaller, the interference load possibly exceeds the load which needs to be measured, and the precision and the accuracy of the measured small load are inevitably reduced.
Disclosure of Invention
The invention aims to overcome the defects and provides the air floatation supporting device of the wind tunnel test measuring equipment, the measured object and the floating frame are supported by high-pressure air sprayed by the air floatation device, the additional interference load caused by the mechanical connection of the floating frame and the fixed frame is avoided, the measurement precision of small load (within 100N) is improved, and the air floatation supporting device can be applied to wind tunnel test.
In order to achieve the above purpose, the invention provides the following technical scheme:
an air floatation supporting device of a wind tunnel test measuring device comprises a platform assembly, an air floatation block and an air floatation screw rod;
the platform assembly is fixedly arranged on the upper surface of the fixed frame and comprises a horizontal adjusting structure at the lower part and an air floatation supporting platform at the upper part, the horizontal adjusting structure is used for adjusting the levelness of the air floatation supporting platform, and the air floatation supporting platform is used for converting air injection pressure into supporting force for an air floatation block;
the air floating block is arranged above the air floating supporting platform, and the lower surface of the air floating block is in contact with the upper surface of the air floating supporting platform in an unvented state;
the lower surface of the air floatation block is provided with an air outlet, the inside of the air floatation block is provided with a ventilation channel, the ventilation channel is connected with an external compressed air inlet and the air outlet, and compressed air in a ventilation state is downwards sprayed out through the air outlet so as to enable the air floatation block to float upwards;
the lower end of the air floatation screw is connected with the upper surface of the air floatation block through a spherical hinge, so that the air floatation screw has three rotational degrees of freedom; the floating frame is fixed on the air floating screw rod, and the floating frame is driven to float upwards when the air floating block floats upwards.
Furthermore, the horizontal adjusting structure is a supporting rod; the lower end of the support rod is fixedly arranged on the upper surface of the fixed frame, and the upper end of the support rod is fixedly connected with the lower surface of the air floatation support platform.
Furthermore, the number of the supporting rods is more than or equal to 3, and the supporting rods are positive and negative threaded supporting rods.
Furthermore, the levelness of the upper surface of the air floatation supporting platform is less than or equal to 1'.
Furthermore, the air-floating supporting platform is of a plate-shaped structure, and the thickness of the air-floating supporting platform is more than or equal to 150 mm.
Further, the material used for the air-floating supporting platform is marble or steel plate.
Furthermore, the floating frame is fixed on the air floating screw rod by adopting an air floating nut and a connecting screw, and the lower part of the floating frame is fastened and positioned by adopting a fastening nut.
Further, the platform assembly is fixed on the fixed frame by adopting a connecting bolt.
Furthermore, the roughness of the upper surface of the air floatation supporting platform is less than or equal to 1.6 um.
Furthermore, the distance between the air floating block and the upper surface of the air floating supporting platform is 20-50 μm when the air floating block floats upwards.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the air floating block structure, utilizes the compressed air sprayed by the air floating block to support the air floating block, realizes the non-mechanical connection in the gravity direction, eliminates the interference of other components to the transverse force, and improves the small load measurement precision of the measured object.
(2) The size and the structure of the air floating block can be changed according to the weight of the model, the bearing capacity of different air floating blocks is different, and the weight range and the size capable of bearing the measured object are wider through different support layouts.
(3) The invention has the advantages of convenient installation and low processing cost by adopting a supporting mode, is suitable for the existing wind tunnel test split type measuring equipment and has strong universality.
Drawings
FIG. 1 is a schematic structural view of an air floatation support device according to the present invention;
FIG. 2 is a schematic view of the air supporting device according to the present invention;
FIG. 3 is a layout view of the air supporting device of the present invention in a large-scale force measuring device;
FIG. 4 is a sensor profile for measurements made with a measurement apparatus incorporating the air bearing support of the present invention.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The air-floating support device of the wind tunnel test measuring equipment enables the fixed frame and the floating frame to be connected without friction, the floating frame is suspended through high-pressure air sprayed by the air-floating device to support a measured object and the floating frame, the measured object and the floating frame are connected with a steel wire of a sensor except for the gravity direction, the floating frame belongs to a free drift state, after the measured object is stressed, the floating frame almost transmits the force to the sensor, the sensor measures the resistance, and the small-load measuring precision is improved.
As shown in fig. 1, the air-floating support device of the wind tunnel test measurement equipment of the invention is characterized by comprising a platform component 18, an air-floating block 4 and an air-floating screw 5;
the platform assembly 18 is fixedly arranged on the upper surface of the fixed frame 1 and comprises a horizontal adjusting structure 3 at the lower part and an air floatation supporting platform 17 at the upper part, the horizontal adjusting structure 3 is used for adjusting the levelness of the air floatation supporting platform, and the air floatation supporting platform 17 is used for converting air injection pressure into supporting force for the air floatation block 4;
the air floating block 4 is arranged above the air floating supporting platform 17, and the lower surface of the air floating block 4 is in contact with the upper surface of the air floating supporting platform 17 in an unvented state;
the lower surface of the air floating block 4 is provided with an air outlet, the inside of the air floating block is provided with a ventilation channel, the ventilation channel is connected with an external compressed air inlet and the air outlet, compressed air in a ventilation state is downwards sprayed out through the air outlet, and then the air floating block 4 floats upwards;
the lower end of the air floatation screw rod 5 is connected with the upper surface of the air floatation block 4 through a spherical hinge, so that the air floatation screw rod 5 has three rotational degrees of freedom relative to the upper surface of the air floatation block 4; the floating frame 2 is fixed on the air floating screw rod 5, and the air floating block 4 drives the floating frame 2 to float upwards when floating upwards.
Further, the horizontal adjusting structure 3 is a supporting rod; the lower end of the support rod is fixedly arranged on the upper surface of the fixed frame 1, and the upper end of the support rod is fixedly connected with the lower surface of the air floatation support platform 17.
Furthermore, the number of the support rods is more than or equal to 3; the support rod is a positive and negative thread support rod.
Furthermore, the levelness of the upper surface of the air-floating supporting platform 17 is less than or equal to 1'.
Further, the air-floating supporting platform 17 is of a plate-shaped structure, and the thickness is more than or equal to 150 mm.
Further, the material of the air-floating supporting platform 17 is marble or steel plate.
Further, the floating frame 2 is fixed on the air floating screw rod 5 by an air floating nut 6 and a connecting screw 7, and is fastened and positioned by a fastening nut 8 below the air floating screw rod. Before the air supporting block 4 is installed, the fastening nut 8 is screwed in from the top end of the air supporting screw rod 5, the lower end of the air supporting screw rod 5 is fixedly connected with the air supporting block 4 through a spherical hinge, the air supporting screw rod 5 is driven by the air supporting block 4 to be screwed in from the lower end of the air supporting nut 6, the lower surface of the air supporting block 4 is in contact with the upper surface of the marble platform assembly 3, and the air supporting block is not ventilated.
Further, the platform assembly 18 is fixed to the fixed frame 1 using the connecting bolt 9.
Furthermore, the surface roughness of the air floatation supporting platform 17 is less than or equal to 1.6um, so that the compressed air at the bottom of the air floatation block 4 can be uniformly discharged in all directions.
Further, the floating frame 2 is placed on a marble platform by an air floating block 4. When high-pressure air is introduced into the air floating block, the air floating block 4 drives the floating frame 2 to float at a certain height H, as shown in FIG. 2, and in this state, the floating frame 2 and the fixed frame 1 are not mechanically connected in the lifting force direction. Since the air friction coefficient is very small, the disturbance of the lateral forces is greatly reduced.
The distance between the air floating block 4 and the upper surface of the air floating supporting platform 17 when the air floating block floats upwards is 20-50 microns.
The invention solves the problem that the inevitable model weight generated by mechanical connection between the floating frame and the fixed frame of the conventional force measuring device and the load in the lifting force direction interfere with the transverse load, solves the problem of large interference load generated by a large-scale model due to the load in the gravity direction, and improves the measurement accuracy of the small resistance load.
Example 1
In a wind tunnel test, the air-floating supporting devices 16 are arranged at four peripheral corners of a wind tunnel test force-measuring device to realize the support of the floating frame 2 and the fixed frame 1, the weight of a measured object is transmitted to the air-floating supporting platform 17 through the floating frame 2, as shown in fig. 3 and 4, the measurement of the pneumatic force of a test model can be realized, and the specific process is as follows:
s1, mounting a normal force sensor, an axial force sensor and a lateral force sensor in the air floatation wind tunnel test device;
s2 reading the measurement result of each sensor;
s3, calculating the axial force, the normal force, the lateral force, the roll moment, the yaw moment and the pitch moment of the test model according to the measurement result of each sensor.
Further, as shown in fig. 4, the normal force sensors are divided into four groups and fixed on the floating frame 2, and the groups between the normal force sensors y1 and y2, and between the normal force sensors y3 and y4 are symmetrical with respect to the symmetry axis passing through the center Z direction of the floating frame; symmetry is achieved between the normal force sensor group y1 and the normal force sensor group y4, between the normal force sensor group y2 and the normal force sensor group y3 with respect to a symmetry axis passing through the center X of the floating frame;
the axial force sensors are divided into two groups and are simultaneously connected with the fixed frame 1 and the floating frame 2, and the axial force sensor group x1 and the axial force sensor group x2 are symmetrical about a symmetrical axis in the Z direction of the center of the fixed frame;
the lateral force sensors are divided into four groups and are simultaneously connected with the fixed frame 1 and the floating frame 2, and the groups between the lateral force sensors Z1 and the lateral force sensors Z2 and between the lateral force sensors Z3 and the lateral force sensors Z4 are symmetrical about a symmetrical axis passing through the center Z direction of the floating frame; the symmetry axes between the lateral force sensor group z1 and the lateral force sensor group z4, and between the lateral force sensor group z2 and the lateral force sensor group z3 are symmetrical with respect to the symmetry axis passing through the center X of the floating frame;
in step S2, the test model applies a load to the floating frame 2 to cause the signals of the sensors in each group to change, and reads the measurement results Y1, Y2, Y3, Y4 of the normal force sensor group, the measurement results X1, X2 of the axial force sensor group, and the measurement results Z1, Z2, Z3, Z4 of the lateral force sensor group;
in the step S3, the axial force, the normal force, the lateral force, the roll moment, the yaw moment and the pitch moment, which are applied to the test model, are calculated respectively:
axial force a ═ X1-X2;
normal force N ═ Y1+ Y2+ Y3+ Y4;
the lateral force Z is Z1+ Z2-Z3-Z4;
roll torque MX ═ L2 × (Y1+ Y2-Y3-Y4);
yaw moment MY ═ L1 × (Z1+ Z4-Z2-Z3);
a pitching moment MZ ═ L1 × (Y1+ Y4-Y2-Y3);
the L2 is the distance between each group of normal force sensors in the Z direction, and the L1 is the distance between each group of lateral force sensors in the X direction;
and the X, Y and Z directions are the directions of X, Y and Z axes in a coordinate system of the wind tunnel test measuring equipment.
The wind tunnel test measuring equipment coordinate system takes the central point of the floating frame 2 as an original point, the axial force direction of the test model is an X axis, the normal force direction of the test model is a Y axis, and the lateral force direction of the test model is a Z axis.
Further, in step S1, each of the normal force sensor group, the axial force sensor group and the lateral force sensor group includes at least one corresponding sensor; the measurement results of each group of normal force sensor group, axial force sensor group and lateral force sensor group are the synthesis of the measurement results of all sensors included in each group of normal force sensor group, axial force sensor group and lateral force sensor group.
Further, as shown in fig. 4, a model connecting member 19 is provided at an upper portion of the normal sensor for fixing the test model.
Furthermore, the model connecting piece 19 is provided with threads and is fixedly connected with the test model through the threads.
Further, in step S1, the floating frame 2 floats above the fixed frame 1 by the air floating support device 16 to a height of 20-50 μm.
Further, the height of the floating frame 2 floating above the fixed frame 1 by the air supporting means 16 is kept constant during the test. The only guarantee in the test process is that the floating frame 2 and the fixed frame 1 are kept relatively static, the suspension height is kept unchanged, and the floating height of the floating frame 2 is very small, so that the steel wire rope can be considered to be in a horizontal state, and the floating frame 2 and the fixed frame 1 are guaranteed to be relatively static, so that the measurement precision can be improved.
Further, in step S1, the axial force sensor group and the lateral force sensor group are fixed to the fixed frame 1 and connected to the floating frame 2 through a wire rope.
Further, the length of the steel wire soft rope is more than or equal to 0.5m, and the diameter of the steel wire soft rope is more than or equal to 0.5 mm.
During force measurement, high-pressure air (namely compressed air, the pressure is more than or equal to 4 atmospheric pressures) is introduced into the air floating block 4, the air flow sprayed downwards from the air floating block 4 enables the air floating block 4 and the floating frame 2 to be suspended together at a micro height H (about 20-50 microns), the air floating block 4 is separated from the surface of the platform assembly 18, a thin air film is formed in the middle, due to the fact that the friction coefficient of the air is small, a heavy object generates a small interference force in the transverse direction, almost all loads of the air flow acting on the test model are transmitted to the sensor assembly through the movement of the floating frame 2, and the axial force, the normal force, the lateral force, the rolling moment, the yawing moment and the pitching moment of a measured object can be accurately obtained through different combinations of the sensor assembly.
When the force is not measured, the high-pressure air valve is cut off, the lower surface of the air floatation block 4 is contacted with the platform assembly 18, the weight of the measured object is transmitted to the fixed frame 1 through the platform assembly 18, the stability of the wind tunnel test force measuring equipment and the test model is ensured, and the state returns to the state before the air floatation work.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. An air floatation supporting device of wind tunnel test measuring equipment is characterized by comprising a platform component (18), an air floatation block (4) and an air floatation screw rod (5);
the platform assembly (18) is fixedly arranged on the upper surface of the fixed frame (1) and comprises a horizontal adjusting structure (3) at the lower part and an air floatation supporting platform (17) at the upper part, the horizontal adjusting structure (3) is used for adjusting the levelness of the air floatation supporting platform (17), and the air floatation supporting platform (17) is used for converting air injection pressure into supporting force for the air floatation block (4);
the air floating block (4) is arranged above the air floating supporting platform (17), the lower surface of the air floating block (4) is provided with an air outlet, a ventilation channel is arranged in the air floating block, the ventilation channel is connected with an external compressed air inlet and the air outlet, the lower surface of the air floating block (4) is in contact with the upper surface of the air floating supporting platform (17) in an unventilated state, and compressed air in a ventilated state is sprayed downwards through the air outlet so as to enable the air floating block (4) to float upwards;
the lower end of the air floatation screw rod (5) is connected with the upper surface of the air floatation block (4) through a spherical hinge, so that the air floatation screw rod (5) has three rotational degrees of freedom; the floating frame (2) is fixed on the air floating screw (5), and the air floating block (4) drives the floating frame (2) to float upwards when floating upwards.
2. The air flotation supporting device of the wind tunnel test measuring equipment according to claim 1, characterized in that the horizontal adjusting structure (3) is a supporting rod; the lower end of the supporting rod is fixedly arranged on the upper surface of the fixed frame (1), and the upper end of the supporting rod is fixedly connected with the lower surface of the air floatation supporting platform (17).
3. The air floatation supporting device of the wind tunnel test measuring equipment according to claim 2, wherein the number of the supporting rods is more than or equal to 3.
4. The air flotation supporting device of the wind tunnel test measuring equipment according to claim 2, characterized in that the levelness of the upper surface of the air flotation supporting platform (17) is less than or equal to 1'.
5. The air flotation supporting device of the wind tunnel test measuring equipment according to claim 1, characterized in that the air flotation supporting platform (17) is of a plate-shaped structure, and the thickness is larger than or equal to 150 mm.
6. The air floatation supporting device of the wind tunnel test measuring equipment according to claim 1, characterized in that the material of the air floatation supporting platform (17) is marble or steel plate.
7. The air-flotation supporting device of the wind tunnel test measuring equipment according to claim 1, characterized in that the floating frame (2) is fixed on the air-flotation screw rod (5) by an air-flotation nut (6) and a connecting screw (7), and is fastened and positioned by a fastening nut (8) below the floating frame.
8. The air flotation supporting device for the wind tunnel test measuring equipment according to claim 1, characterized in that the platform assembly (18) is fixed on the fixed frame (1) by connecting bolts (9).
9. The air-flotation supporting device of the wind tunnel test measuring equipment according to claim 1, characterized in that the roughness of the upper surface of the air-flotation supporting platform (17) is less than or equal to 1.6 um.
10. The air flotation supporting device of the wind tunnel test measuring equipment according to claim 1, characterized in that the distance between the air flotation block (4) and the upper surface of the air flotation supporting platform (17) when floating upwards is 20-50 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011596109.8A CN112798215A (en) | 2020-12-29 | 2020-12-29 | Air floatation supporting device of wind tunnel test measuring equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011596109.8A CN112798215A (en) | 2020-12-29 | 2020-12-29 | Air floatation supporting device of wind tunnel test measuring equipment |
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| JPH04321836A (en) * | 1991-04-18 | 1992-11-11 | Tokico Ltd | Damping device |
| CN101832851A (en) * | 2010-05-31 | 2010-09-15 | 中国航空工业空气动力研究院 | Air flotation force measuring device of wind tunnel model |
| CN102522020A (en) * | 2011-11-10 | 2012-06-27 | 北京交通大学 | Device for training and detecting extravehicular operation capability |
| CN103528788A (en) * | 2013-10-24 | 2014-01-22 | 湖南大学 | Force and pressure measurement model of bridge |
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| CN108132133A (en) * | 2017-12-04 | 2018-06-08 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of combined type multi -components flapping wing aircraft high-lift systems test method |
| CN108945538A (en) * | 2018-08-31 | 2018-12-07 | 天津航天机电设备研究所 | A kind of super-large space capsule expansion zero-g simulator |
| CN211759594U (en) * | 2019-12-25 | 2020-10-27 | 中国电子科技集团公司第十四研究所 | High-precision radar antenna air floatation support butt joint equipment |
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2020
- 2020-12-29 CN CN202011596109.8A patent/CN112798215A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04321836A (en) * | 1991-04-18 | 1992-11-11 | Tokico Ltd | Damping device |
| CN101832851A (en) * | 2010-05-31 | 2010-09-15 | 中国航空工业空气动力研究院 | Air flotation force measuring device of wind tunnel model |
| CN102522020A (en) * | 2011-11-10 | 2012-06-27 | 北京交通大学 | Device for training and detecting extravehicular operation capability |
| CN103528788A (en) * | 2013-10-24 | 2014-01-22 | 湖南大学 | Force and pressure measurement model of bridge |
| CN205679211U (en) * | 2016-06-16 | 2016-11-09 | 西安力德测量设备有限公司 | A kind of air supporting load carrier paying end for three coordinate measuring machine |
| CN108132133A (en) * | 2017-12-04 | 2018-06-08 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of combined type multi -components flapping wing aircraft high-lift systems test method |
| CN108945538A (en) * | 2018-08-31 | 2018-12-07 | 天津航天机电设备研究所 | A kind of super-large space capsule expansion zero-g simulator |
| CN211759594U (en) * | 2019-12-25 | 2020-10-27 | 中国电子科技集团公司第十四研究所 | High-precision radar antenna air floatation support butt joint equipment |
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Application publication date: 20210514 |