CN109668664A - A kind of milli ox grade mantle friction force measuring device - Google Patents
A kind of milli ox grade mantle friction force measuring device Download PDFInfo
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- CN109668664A CN109668664A CN201811462644.7A CN201811462644A CN109668664A CN 109668664 A CN109668664 A CN 109668664A CN 201811462644 A CN201811462644 A CN 201811462644A CN 109668664 A CN109668664 A CN 109668664A
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- upper cover
- sensor
- measuring device
- pedestal
- stock
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The present invention provides a kind of milli ox grade mantle friction force measuring device, there are four threaded holes for the measuring device pedestal quadrangle band in order to be fixed in tested model；Sensor internal is disposed with the piezoelectric quartz crystal plate of certain cut type；Studs and nut are used for pedestal, the connection of sensor and upper cover；Polytetrafluoroethylene (PTFE) is covered positioned at center sensor hole and studs between, plays positioning action, guarantee pedestal, and the center of sensor and upper cover is on same straight line；Dust excluding plate is for encapsulating and preventing dust from entering connecting portion；Pinboard is for connecting upper cover and stock；Stock is used to amplify minimal friction；Sensing head upper surface is for sensing air surface frictional force.The present invention is combined with lever principle using piezoelectric type torque sensor and is measured to aircraft surface minimal friction, the interference of vertical direction power can effectively be avoided, surface minimal friction is amplified using lever principle simultaneously, can be realized and aircraft surface milli ox grade frictional force is rapidly and accurately measured.
Description
Technical field
The invention belongs to piezoelectric force technical fields, are applied to dummy vehicle wind tunnel test, and in particular to a kind of milli ox
Grade mantle friction force measuring device is, it can be achieved that measurement to aircraft surface milli ox grade frictional force.
Background technique
Skin friction resistance is the big drag sources during aircraft flight, studies have shown that subsonic flight device patrols
Boat state frictional resistance accounts for drag overall up to 50%.Therefore, Research of Drag Reduction or friction loss characteristic research have weight to the performance of aircraft
It influences, reducing frictional resistance means to increase voyage under identical fuel consumption, or can take in the certain situation of voyage
More payload, the only frictional resistance of correct measurement aircraft surface are carried, could be how to be provided using Drag reduction devices
Accurate instruction mode.For the development of aircraft, under the conditions of hypersonic, the Aerodynamic Heating of aircraft surface is mainly derived from table
Face frictional resistance, the accurate size for obtaining aircraft surface frictional resistance will provide reliable basis for correct heat protection design.
Currently, the device for measuring frictional force, other than some methods using oil film, the structure of most of device is special
Point is to install a removable sensing head at the top of cantilever beam to sense air to aircraft surface using cantilever beam structure
Frictional force.Meritt R J,Schetz J A,Marineau E C,et al.Direct Skin Friction
Measurements at Mach 10in a Hypervelocity Wind Tunnel[J].Journal of
Spacecraft&Rockets, 2017,54 (4): 1-12. describes a kind of funnelform mantle friction force measuring device, utilizes
At cantilever beam flexure position, the method for patch foil gauge carrys out the frictional force in sensation level direction, and carries out in hypersonic wind tunnel
Experiment.Although this method can measure horizontal friction force, under physical condition, also can during aircraft flight
There is vertical direction power, then how in the case where offsetting the interference of vertical direction power rapidly and accurately to measure level simultaneously
The skin-friction force in direction becomes aerospace field a great problem.
The present invention is based on piezoelectric type torque sensors to measure aircraft surface air friction, with piezoelectric quartz crystalline substance
Body is mechanical quantity sensing element, has the characteristics that high rigidity, high natural frequency, high sensitivity and excellent in stability, is very suitable to
The measurement of the power high for precision, dynamic property is good.By selecting the chip of certain cut type, reasonable arrangement keeps its right
The power of vertical direction is insensitive, eliminates the interference of vertical direction power, the mantle friction in combination with lever principle to horizontal direction
Power amplifies measurement.
Summary of the invention
The present invention is intended to provide a kind of device that can quick and precisely measure aircraft surface air friction, can eliminate
The interference of vertical direction power, and measurement can be amplified to milli ox grade skin-friction force.
Technical solution of the present invention:
A kind of milli ox grade mantle friction force measuring device, including measuring device pedestal 1, sensor 2, studs 3, poly- four
Vinyl fluoride set 4, upper cover 5, nut 6, dust excluding plate 7, pinboard 8, stock 9 and sensing head 10；5 main body of pedestal 1 and upper cover
Structure is identical, and quadrangle is respectively equipped with threaded hole, for being fixed in tested model；One is disposed with inside the sensor 2
Determine the piezoelectric quartz crystal plate of cut type, sensor 2 is installed between pedestal 1 and upper cover 5, cooperates reality by studs 3 and nut 6
Now connect；The polytetrafluoroethylene (PTFE) set 4 plays positioning action, guarantees between 2 centre bore of sensor and studs 3
The center of pedestal 1, sensor 2 and upper cover 5 is on same straight line；The center of the upper cover 5 is used for equipped with stepped hole
Placing nut 6 and dust excluding plate 7；The dust excluding plate 7 is for encapsulating and preventing dust from entering connecting portion；The pinboard 8
It is fixed in upper cover 5, for connecting upper cover 5 and stock 9；Stock 9 is used to amplify small power；It uses 10 upper surface of sensing head
In sensing air surface frictional force, lower surface is threadedly coupled with stock 9.
Beneficial effects of the present invention: the present invention is combined with lever principle to aircraft table using piezoelectric type torque sensor
Face minimal friction measures, and can effectively avoid the interference of vertical direction power, while small to surface using lever principle
Frictional force amplification, can be realized and rapidly and accurately measure aircraft surface milli ox grade frictional force.
Detailed description of the invention
Fig. 1 is mantle friction force measuring device stress diagram.
Fig. 2 is skin-friction force apparatus structure schematic diagram.
In figure: 1 measuring device pedestal；2 sensors；3 studs；4 polytetrafluoroethylene (PTFE) sets；5 upper covers；6 nuts；7 is dust-proof
Plate；8 pinboards；9 stocks；10 sensing heads.
Specific embodiment
In conjunction with technical solution of the present invention and attached drawing, further a specific embodiment of the invention.
A kind of piezoelectric type mantle friction force measuring device, there are four threaded holes for 1 four jiaos of bands of pedestal convenient for being fixed on tested mould
In type；The piezoelectric quartz crystal plate of certain cut type is disposed with inside sensor 2；Studs 3 and nut 6 are used for pedestal 1, sensor
2 and upper cover 5 connection；Polytetrafluoroethylene (PTFE) set 4 plays positioning action between 2 centre bore of sensor and studs, guarantees
The center of pedestal 1, sensor 2 and upper cover 5 is on same straight line；There are four threaded holes for 5 four jiaos of bands of upper cover, are convenient for and other zero
The stepped hole of part connection, center is used for placing nut 6 and dust excluding plate 7；Dust excluding plate 7 is for encapsulating and preventing dust from entering company
Socket part position；Pinboard 8 is for connecting upper cover 5 and stock 9；Stock 9 is used to amplify small power；Sensing 10 upper surface of head is for sensing
Air surface frictional force, lower surface are threadedly coupled with stock 9.
The measuring principle of the mantle friction force measuring device: by filling measurement for the chip reasonable Arrangement of certain cut type
It sets insensitive to the power of vertical direction, which is rationally built in tested model, make to sense head and be flush to tested mould
Type surface, airflow direction sense head 10 and incude air surface frictional force, pass through lever principle and statics Analysis perpendicular to stock
Obtain aircraft surface frictional force.The measuring device can be realized the measurement of model surface frictional force in principle.
Although the present invention is made that detailed description to the present invention with above-mentioned preferred embodiment, not with above-mentioned implementation
Example limits the present invention.Those skilled in the art is not it should be recognized that departing from technical characteristic given by the present invention and range
In the case of, to increase made by technology and the replacement of some same contents in this field, it is within the scope of protection of the invention.
Claims (1)
1. a kind of milli ox grade mantle friction force measuring device, which is characterized in that the milli ox grade mantle friction force measuring device
Including measuring device pedestal (1), sensor (2), studs (3), polytetrafluoroethylene (PTFE) set (4), upper cover (5), nut (6), prevent
Dirt plate (7), pinboard (8), stock (9) and sensing head (10)；The pedestal 1 is identical with upper cover (5) main structure, and quadrangle is equal
It is respectively equipped with threaded hole, for being fixed in tested model；The piezoelectricity stone of certain cut type is disposed with inside the sensor (2)
English chip, sensor (2) are installed between pedestal 1 and upper cover (5), are realized and are connected by studs (3) and nut (6) cooperation
It connects；The polytetrafluoroethylene (PTFE) set (4) is located between sensor (2) centre bore and studs (3), plays positioning action, protects
The center of pedestal 1, sensor (2) and upper cover (5) is demonstrate,proved on same straight line；The center of the upper cover (5) is equipped with rank
Terraced hole is used for placing nut (6) and dust excluding plate (7)；The dust excluding plate (7) is for encapsulating and preventing dust from entering connecting portion；
The pinboard (8) is fixed on upper cover (5), for connecting upper cover (5) and stock (9)；Stock (9) is for putting small power
Greatly；For sensing air surface frictional force, lower surface is threadedly coupled with stock (9) for sensing head (10) upper surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811462644.7A CN109668664B (en) | 2018-12-03 | 2018-12-03 | milli-Newton level surface friction force measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811462644.7A CN109668664B (en) | 2018-12-03 | 2018-12-03 | milli-Newton level surface friction force measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109668664A true CN109668664A (en) | 2019-04-23 |
| CN109668664B CN109668664B (en) | 2021-02-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811462644.7A Active CN109668664B (en) | 2018-12-03 | 2018-12-03 | milli-Newton level surface friction force measuring device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5178004A (en) * | 1991-08-08 | 1993-01-12 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Reflection type skin friction meter |
| CN1645103A (en) * | 2005-01-27 | 2005-07-27 | 上海交通大学 | Microfriction testers |
| CN1645077A (en) * | 2005-01-27 | 2005-07-27 | 上海交通大学 | Two-dimensional micro-force measuring sensors |
| US20090223302A1 (en) * | 2007-12-03 | 2009-09-10 | United States of America as represented by the Administrator of the National Aeronautics and | Two-axis direct fluid shear stress sensor |
| CN206832388U (en) * | 2017-03-15 | 2018-01-02 | 广西大学 | A kind of friction measurement device of rolling piston compressor slide plate and chute |
| CN207248713U (en) * | 2017-09-05 | 2018-04-17 | 河北科技大学 | A kind of centrifugal micro- force test system of milli ox level |
-
2018
- 2018-12-03 CN CN201811462644.7A patent/CN109668664B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5178004A (en) * | 1991-08-08 | 1993-01-12 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Reflection type skin friction meter |
| CN1645103A (en) * | 2005-01-27 | 2005-07-27 | 上海交通大学 | Microfriction testers |
| CN1645077A (en) * | 2005-01-27 | 2005-07-27 | 上海交通大学 | Two-dimensional micro-force measuring sensors |
| US20090223302A1 (en) * | 2007-12-03 | 2009-09-10 | United States of America as represented by the Administrator of the National Aeronautics and | Two-axis direct fluid shear stress sensor |
| CN206832388U (en) * | 2017-03-15 | 2018-01-02 | 广西大学 | A kind of friction measurement device of rolling piston compressor slide plate and chute |
| CN207248713U (en) * | 2017-09-05 | 2018-04-17 | 河北科技大学 | A kind of centrifugal micro- force test system of milli ox level |
Non-Patent Citations (1)
| Title |
|---|
| RYAN J.MERITT*: "Direct Skin Friction Measurements at Mach 10 in a Hypervelocity wind Tunnel", 《JOURNAL OF SPACECRAFT AND ROCKETS》 * |
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| CN109668664B (en) | 2021-02-26 |
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