CN211262655U - Strain type two-component surface friction resistance measuring balance - Google Patents
Strain type two-component surface friction resistance measuring balance Download PDFInfo
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- CN211262655U CN211262655U CN202020308142.5U CN202020308142U CN211262655U CN 211262655 U CN211262655 U CN 211262655U CN 202020308142 U CN202020308142 U CN 202020308142U CN 211262655 U CN211262655 U CN 211262655U
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- 238000000034 method Methods 0.000 claims description 5
- 229910001008 7075 aluminium alloy Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 27
- 230000001681 protective effect Effects 0.000 description 7
- 238000010008 shearing Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
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Abstract
The utility model discloses a two weight surface friction resistance measurement balances of strain type. The surface friction resistance measuring balance is of an integrated structure, and the main body is a cylinder; the upper half part of the cylinder is provided with a through hole I and a through hole II which are bilaterally symmetrical, the upper and lower edges of the through hole I and the through hole II are straight edges, the left and right side edges of the through hole I and the through hole II are arc edges, an entity reserved between the through hole I and the through hole II is an X1 measuring beam, the projection shapes of the upper section and the lower section of the X1 measuring beam are symmetrical arcs, and the projection shape of the middle section of the X1 measuring beam is a rectangle; entities reserved on the outer sides of the through hole I and the through hole II are separated through symmetrical straight seams respectively to form symmetrical X1 overload protection seams; the lower half part of the cylinder is provided with a similar through hole III and a similar through hole IV, and an X2 measuring beam and an X2 overload protection seam are obtained; the X1 measuring beam is vertical to the X2 measuring beam; the surface friction resistance measuring balance can simultaneously measure the surface friction resistance of two vertical directions on the surface of a model and an aircraft, and can realize accurate measurement.
Description
Technical Field
The utility model belongs to the technical field of the wind-tunnel test, concretely relates to two component surface friction resistance measurement balances of strain type.
Background
The surface friction resistance is the resultant force of the shearing force applied to the surface of the aircraft, is an important component of the aircraft resistance, and has great significance for the design of the aircraft for the accurate measurement of the aircraft resistance. At present, the surface friction resistance measurement technology has many difficulties: in order to reduce the damage to the surface of a model or an aircraft, only a small-area surface can be measured, the friction resistance of the small-area surface is very small, and the measuring balance is required to have high enough resolution; the measurement balance is convenient to install and does not influence the structure of the aircraft, and the volume of the measurement balance is required to be small; for a real aircraft, the flight direction is inconsistent with the attitude of the aircraft and changes all the time, so that the total surface friction resistance can be synthesized only by measuring the surface friction resistance in two vertical directions; the normal load borne by the surfaces of the model and the aircraft is far larger than the surface friction resistance, and the impact load in the process of opening and closing the vehicle also needs to be faced in the hypersonic wind tunnel, so that the measuring balance is required to have higher structural rigidity and strength and has an overload protection function. The existing surface friction resistance balance is generally large in size and low in measurement resolution, can only be used for single-component measurement, and is difficult to solve the problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a two-component surface friction resistance measurement balance of strain type is provided.
The utility model discloses a two weight surface friction resistance measurement balances of strain formula, its characteristics are, surface friction resistance measurement balance include: the device comprises an upper connecting end, an X1 measuring beam, an X1 overload protection seam, an X2 overload protection seam, an X2 measuring beam, a fixed end and a rectangular positioning block;
the surface friction resistance measuring balance is of an integrated structure, and the main body is a cylinder;
the upper half part of the cylinder is provided with a through hole I and a through hole II which are bilaterally symmetrical, the upper side and the lower side of the through hole I and the through hole II are straight sides, the left side and the right side of the through hole I and the through hole II are arc sides, an entity reserved between the through hole I and the through hole II is an X1 measuring beam, the projection shapes of the upper section and the lower section of the X1 measuring beam are symmetrical arcs, and the projection shape of the middle section of the X1 measuring beam is a rectangle; entities reserved on the outer sides of the through hole I and the through hole II are separated through symmetrical straight seams respectively to form symmetrical X1 overload protection seams;
the lower half part of the cylinder is provided with a through hole III and a through hole IV which are symmetrical front and back, the upper sides and the lower sides of the through hole III and the through hole IV are straight sides, the left sides and the right sides of the through hole III and the through hole IV are arc sides, an entity reserved between the through hole III and the through hole IV is an X2 measuring beam, the projection shapes of the upper section and the lower section of the X2 measuring beam are symmetrical arcs, and the projection shape of the middle section of the X2 measuring beam is a rectangle; entities reserved outside the through hole III and the through hole IV are separated through symmetrical straight seams respectively to form symmetrical X2 overload protection seams;
the X1 measuring beam is vertical to the X2 measuring beam, and the X1 measuring beam and the X2 measuring beam respectively measure two vertical surface friction resistance components;
the center of the top end of the cylinder is provided with an upper connecting end;
the lower end of the cylinder is fixed with a fixed end, the diameter of the fixed end is larger than that of the cylinder, and the lower surface of the fixed end is fixed with a rectangular positioning block;
two parallel resistance strain gauges are symmetrically adhered to two sides of the middle position of the middle section of the X1 measuring beam, the resistance strain gauges on one side are numbered A1 and A3, the resistance strain gauges on the other side are correspondingly numbered A2 and A4, and an X1 Wheatstone bridge is formed by the A1, the A2, the A3 and the A4; two parallel resistance strain gauges are symmetrically adhered to two sides of the middle position of the middle section of the X2 measuring beam, the resistance strain gauges on one side are numbered as B1 and B3, the resistance strain gauges on the other side are correspondingly numbered as B2 and B4, and an X2 Wheatstone bridge is formed by the B1, the B2, the B3 and the B4.
The width range of the X1 overload protection seam and the X2 overload protection seam is 0.08 mm-0.14 mm.
The surface friction resistance measuring balance is made of 7075 aluminum alloy and is treated by a T6 heat treatment process.
The thickness of the middle sections of the X1 measuring beam and the X2 measuring beam is 0.16-0.24 mm.
The utility model discloses a two component surface friction resistance measuring balance of strain gauge is a two component wind-tunnel balance, has mutually perpendicular's X1 survey beam and X2 survey beam, and X1 survey beam and X2 survey beam are two vertically surface friction resistance components of independent measurement respectively, and when certain component load acts on alone, only the Wheatstone bridge of this component has great output, and the Wheatstone bridge of another component does not have output basically. The X1 measuring beam and the X2 measuring beam are designed according to the stress concentration principle, so that the rigidity is good, and the bridge output is large when the force is applied.
The utility model discloses a X1 overload protection seam and X2 overload protection seam among the two component surface friction resistance measurement balance of strain formula can play spacing guard action, and when the surface friction resistance measurement balance atress was too big, X1 overload protection seam or X2 overload protection seam will be drawn close, prevents that the surface friction resistance measurement balance from producing too big deformation, plays the guard action.
The utility model discloses a two divide tables of strain surface frictional resistance measuring balance can realize the accurate measurement of the frictional resistance on model and aircraft surface, can measure two vertical direction's surface frictional resistance simultaneously, has very high resolution ratio, and typical range is 0.02N, can distinguish 0.0002N at minimum.
The utility model discloses a diameter of two component surface frictional resistance measurement balances of strain formula is equivalent with measurement surface size, and along measurement surface normal direction's rigidity height has the overload protection function, not only can be arranged in wind-tunnel test the frictional resistance on aircraft model surface to measure, can also be used to actual aircraft to carry out the frictional resistance measurement on aircraft surface, has very high popularization and application and worth.
The utility model discloses a two weight surface friction resistance measurement balance of strain type simple structure, the size is less, and the simple installation is with low costs.
Drawings
Fig. 1 is an isometric view of a strain gauge type two-component surface friction resistance measuring balance of the present invention;
FIG. 2 is a front view of the strain type two-component surface friction resistance measuring balance of the present invention;
FIG. 3 is a left side view of the strain type two-component surface friction resistance measuring balance of the present invention;
FIG. 4 is a top view of the strain gauge type two-component surface frictional resistance measuring balance of the present invention;
FIG. 5 is a bottom view of the strain type two-component surface friction resistance measuring balance of the present invention;
fig. 6a is a sticking position of the beam resistance strain gauge for X1 measurement of the balance for measuring strain type two-component surface frictional resistance according to the present invention;
FIG. 6b is the X1 Wheatstone bridge of the strain-type two-component surface friction resistance measuring balance of the present invention;
fig. 6c is a sticking position of the beam resistance strain gauge for X2 measurement of the balance for measuring strain type two-component surface frictional resistance according to the present invention;
FIG. 6d is the X2 Wheatstone bridge of the strain-type two-component surface friction resistance measuring balance of the present invention;
fig. 7 is a schematic view of a typical assembly of the strain gauge type two-component surface friction resistance measuring balance of the present invention.
In the figure, 1, an aircraft or model shell 2, a measuring surface 3, a surface friction resistance measuring balance 4, a connecting piece 5, a set screw 6, a balance protective shell 7, an upper connecting end 8, an X1 measuring beam 9, an X1 overload protection seam 10, an X2 overload protection seam 11, an X2 measuring beam 12 and a fixed end 13 are rectangular positioning blocks;
the X1 wheatstone bridge has strain gage numbers: a1, a2, A3, a 4; the X2 wheatstone bridge has strain gage numbers: b1, B2, B3 and B4.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 5, the utility model discloses a two component surface friction resistance measurement balance of strain gauge includes: the device comprises an upper connecting end 7, an X1 measuring beam 8, an X1 overload protection seam 9, an X2 overload protection seam 10, an X2 measuring beam 11, a fixed end 12 and a rectangular positioning block 13;
the surface friction resistance measuring balance 3 is of an integrated structure, and the main body is a cylinder;
the upper half part of the cylinder is provided with a through hole I and a through hole II which are bilaterally symmetrical, the upper sides and the lower sides of the through hole I and the through hole II are straight sides, the left sides and the right sides of the through hole I and the through hole II are arc sides, an entity reserved between the through hole I and the through hole II is an X1 measuring beam 8, the projection shapes of the upper section and the lower section of the X1 measuring beam 8 are symmetrical arcs, and the projection shape of the middle section of the X1 measuring beam 8 is a rectangle; entities reserved outside the through hole I and the through hole II are separated through symmetrical straight seams respectively to form a symmetrical X1 overload protection seam 9;
the lower half part of the cylinder is provided with a through hole III and a through hole IV which are symmetrical front and back, the upper sides and the lower sides of the through hole III and the through hole IV are straight sides, the left sides and the right sides of the through hole III and the through hole IV are arc sides, an entity reserved between the through hole III and the through hole IV is an X2 measuring beam 11, the projection shapes of the upper section and the lower section of the X2 measuring beam 11 are symmetrical arcs, and the projection shape of the middle section of the X2 measuring beam 11 is a rectangle; entities reserved outside the through hole III and the through hole IV are separated through symmetrical straight seams respectively to form a symmetrical X2 overload protection seam 10;
the X1 measuring beam 8 is vertical to the X2 measuring beam 11, and the X1 measuring beam 8 is vertical to the X2 measuring beam 11 to measure two vertical surface friction resistance components respectively;
the center of the top end of the cylinder is provided with an upper connecting end 7;
a fixed end 12 is fixed at the lower end of the cylinder, the diameter of the fixed end 12 is larger than that of the cylinder, and a rectangular positioning block 13 is fixed on the lower surface of the fixed end 12;
as shown in fig. 6a to 6d, two parallel resistance strain gauges are symmetrically adhered to two sides of the middle position of the middle section of the X1 measuring beam 8, the resistance strain gauges on one side are numbered as a1 and A3, the resistance strain gauges on the other side are correspondingly numbered as a2 and a4, and an X1 wheatstone bridge is formed by a1, a2, A3 and a 4; two parallel resistance strain gauges are symmetrically adhered to two sides of the middle position of the middle section of the X2 measuring beam 11, the resistance strain gauges on one side are numbered as B1 and B3, the resistance strain gauges on the other side are correspondingly numbered as B2 and B4, and an X2 Wheatstone bridge is formed by the B1, the B2, the B3 and the B4.
The width range of the X1 overload protection seam 9 and the X2 overload protection seam 10 is 0.08 mm-0.14 mm.
The surface friction resistance measuring balance 3 is made of 7075 aluminum alloy and is treated by a T6 heat treatment process.
The thickness of the middle sections of the X1 measuring beam 8 and the X2 measuring beam 11 is 0.16-0.24 mm.
Example 1
As shown in fig. 7, the surface friction resistance measuring balance 3 of the present embodiment is processed with a matching balance protective housing 6, the balance protective housing 6 is a cylinder with a closed bottom, and covers the surface friction resistance measuring balance 3 from bottom to top, the surface friction resistance measuring balance 3 and the balance protective housing 6 are connected in a surface fit manner, are positioned by a rectangular positioning block 13, and are tightened and fixed by a bottom screw; the surface friction resistance measuring balance 3 is connected with the connecting piece 4 in a column matching way and is fixed by a set screw 5. The measuring surface 2 is connected to the connecting piece 4, then the balance protective shell 6 is installed in an aircraft shell needing to be measured, the gap around the measuring surface is adjusted, the connecting piece 4 with different sizes can be used for adapting to different measuring surfaces 2, and a measuring line is led out from the bottom or the side at a proper position according to the condition of the internal structure of a model or an aircraft.
In the wind tunnel test or the real flight process of the aircraft, the shearing force acting on the measuring surface 2 is transmitted to the surface friction resistance measuring balance 3 through the connecting piece 4, so that the X1 measuring beam 8 and the X2 measuring beam 11 are deformed, the Wheatstone bridge adhered to the measuring beam loses the original balance to generate a voltage signal increment, the surface friction resistance is obtained through the corresponding relation between the output voltage of the Wheatstone bridge and the load, and the surface friction resistance measurement is completed.
The surface friction resistance measuring balance 3 in this embodiment is connected to the balance protective case 6 through the fixed end 12 and the rectangular positioning block 13, so that the connection stress can be prevented from being transmitted to the surface friction resistance measuring balance 3, and the reliability of the surface friction resistance measuring balance 3 can be improved.
The balance protective housing 6 in this embodiment can play a role in protecting the balance, isolating the internal air flow, fixing the measurement line and connecting with the aircraft housing.
Add connecting piece 4 between measuring face 2 and surperficial frictional resistance measuring balance 3, can make single surperficial frictional resistance measuring balance 3 adapt to the measuring face 2 of a plurality of different grade types to convenient change and the adjustment measure 2 positions of face.
Claims (4)
1. A strain gauge type two-component surface friction resistance measuring balance, characterized in that said surface friction resistance measuring balance (3) comprises: the device comprises an upper connecting end (7), an X1 measuring beam (8), an X1 overload protection seam (9), an X2 overload protection seam (10), an X2 measuring beam (11), a fixed end (12) and a rectangular positioning block (13);
the surface friction resistance measuring balance (3) is of an integrated structure, and the main body is a cylinder;
the upper half part of the cylinder is provided with a through hole I and a through hole II which are bilaterally symmetrical, the upper side and the lower side of the through hole I and the through hole II are straight sides, the left side and the right side of the through hole I and the through hole II are arc sides, an entity reserved between the through hole I and the through hole II is an X1 measuring beam (8), the projection shapes of the upper section and the lower section of the X1 measuring beam (8) are symmetrical arcs, and the projection shape of the middle section of the X1 measuring beam (8) is a rectangle; entities reserved on the outer sides of the through hole I and the through hole II are separated through symmetrical straight seams respectively to form symmetrical X1 overload protection seams (9);
the lower half part of the cylinder is provided with a through hole III and a through hole IV which are symmetrical front and back, the upper sides and the lower sides of the through hole III and the through hole IV are straight sides, the left sides and the right sides of the through hole III and the through hole IV are arc sides, an entity reserved between the through hole III and the through hole IV is an X2 measuring beam (11), the projection shapes of the upper section and the lower section of the X2 measuring beam (11) are symmetrical arcs, and the projection shape of the middle section of the X2 measuring beam (11) is a rectangle; entities reserved outside the through hole III and the through hole IV are separated through symmetrical straight seams respectively to form a symmetrical X2 overload protection seam (10);
the X1 measuring beam (8) is vertical to the X2 measuring beam (11), and the X1 measuring beam (8) and the X2 measuring beam (11) respectively measure two vertical surface friction resistance components;
the center of the top end of the cylinder is provided with an upper connecting end (7);
a fixed end (12) is fixed at the lower end of the cylinder, the diameter of the fixed end (12) is larger than that of the cylinder, and a rectangular positioning block (13) is fixed on the lower surface of the fixed end (12);
two parallel resistance strain gauges are symmetrically adhered to two sides of the middle position of the middle section of the X1 measuring beam (8), the resistance strain gauges on one side are numbered A1 and A3, the resistance strain gauges on the other side are correspondingly numbered A2 and A4, and an X1 Wheatstone bridge is formed by the resistance strain gauges on the A1, the resistance strain gauges on the A2, the resistance strain gauges on the A3 and the resistance strain gauges on the A4; two parallel resistance strain gauges are symmetrically adhered to two sides of the middle position of the middle section of the X2 measuring beam (11), the resistance strain gauges on one side are numbered as B1 and B3, the resistance strain gauges on the other side are correspondingly numbered as B2 and B4, and an X2 Wheatstone bridge is formed by the B1, the B2, the B3 and the B4.
2. The balance for measuring strain type two-component surface frictional resistance according to claim 1, wherein the widths of the X1 overload protection slits (9) and the X2 overload protection slits (10) are in the range of 0.08mm to 0.14 mm.
3. The balance for measuring the frictional resistance of a strain type two-component surface as claimed in claim 1, wherein the material of the balance (3) is 7075 aluminum alloy, and is treated by a heat treatment process of T6.
4. The balance for measuring strain type two-component surface frictional resistance according to claim 1, wherein the thickness of the middle section of the X1 measuring beam (8) and the X2 measuring beam (11) is 0.16mm to 0.24 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020308142.5U CN211262655U (en) | 2020-03-13 | 2020-03-13 | Strain type two-component surface friction resistance measuring balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020308142.5U CN211262655U (en) | 2020-03-13 | 2020-03-13 | Strain type two-component surface friction resistance measuring balance |
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| Publication Number | Publication Date |
|---|---|
| CN211262655U true CN211262655U (en) | 2020-08-14 |
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| CN202020308142.5U Withdrawn - After Issue CN211262655U (en) | 2020-03-13 | 2020-03-13 | Strain type two-component surface friction resistance measuring balance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157220A (en) * | 2020-03-13 | 2020-05-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Strain type two-component surface friction resistance measuring balance |
-
2020
- 2020-03-13 CN CN202020308142.5U patent/CN211262655U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157220A (en) * | 2020-03-13 | 2020-05-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Strain type two-component surface friction resistance measuring balance |
| CN111157220B (en) * | 2020-03-13 | 2024-03-26 | 中国空气动力研究与发展中心高速空气动力研究所 | Strain type two-component surface friction resistance measuring balance |
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Granted publication date: 20200814 Effective date of abandoning: 20240326 |
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