A sensitivity-enhancing balance for measuring minute loads and its usage method

Abstract

This invention proposes a sensitive-enhancing structural balance and its usage method for measuring micro-loads, belonging to the field of wind tunnel force measurement technology. The aim is to solve the problem of measuring the surface friction resistance of small-sized models. In this invention, a floating measurement platform is connected to the measuring balance body. The floating head measuring surface is connected to the top of the transmission rod via an "I"-shaped noise reduction joint. The bottom of the transmission rod is connected to the floating head mounting base via a "double Z"-shaped noise reduction joint. The floating head mounting base is connected to the model end mounting base via a connecting device. The model end mounting base is connected to the first frame via a Y-axis strain beam. The first and second frames are connected in a "U" shape via an X-axis strain beam. The third frame is connected to the second frame via a Z-axis strain beam. Strain gauges are attached to the Y-axis, X-axis, and Z-axis strain beams. This invention solves the problem of measuring the surface friction resistance of small-sized models, meeting the dual requirements of miniaturized equipment and data acquisition in experimental scenarios.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel force measurement technology, and particularly relates to a sensitive-enhancing structural balance for measuring micro-loads and its usage method. Background Technology

[0002] The surface friction drag test of an aircraft is a type of wind tunnel force measurement test. By combining the surface friction drag with Newton's law of viscosity, a velocity dimension characterization parameter representing the turbulent shear stress of the aircraft can be obtained, which is used to describe the viscous fluid behavior.

[0003] In wind tunnel tests simulating high-altitude environments, the nozzle boundary layer thickens, significantly reducing the effective experimental area for airflow. Therefore, frictional drag tests must use small-sized models, where the frictional drag acting on the model is only a few tens of millinewtons. The wind resistance of high-speed aircraft comprises two forms: frictional drag and pressure drag. While pressure drag can be measured using mature techniques, frictional drag, due to its extremely small magnitude, is difficult to accurately measure using conventional strain gauge balances.

[0004] In summary, there is an urgent need to design a device that can solve the problem of measuring the surface friction resistance of small-sized models, and meet the dual requirements of miniaturization and data acquisition in experimental scenarios. Summary of the Invention

[0005] A brief overview of the invention is given below to provide a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] In view of this, in order to solve the problem of difficulty in measuring the surface friction resistance of small-sized models, the present invention provides a sensitive structure balance for measuring micro-loads and a method of using it.

[0007] Option 1: A sensitivity-enhancing balance for measuring minute loads, comprising a floating measurement platform, a measuring balance body, and a closed outer shell;

[0008] The floating measurement platform includes a floating head measuring surface, a floating head mounting base, a connecting device, an "I"-shaped noise reduction joint, a "double Z"-shaped noise reduction joint, and a transmission rod. The floating head measuring surface is connected to the top of the transmission rod through the "I"-shaped noise reduction joint, and the bottom of the transmission rod is connected to the floating head mounting base through the "double Z"-shaped noise reduction joint. The floating head mounting base is mounted on the connecting device.

[0009] The measuring balance includes a model end mounting base, a Y-direction strain beam, a first frame, an X-direction strain beam, a second frame, a Z-direction strain beam, a third frame, and a fixed end mounting base. The model end mounting base is connected to the first frame via the Y-direction strain beam. The first and second frames are connected in a U-shape via the X-direction strain beam. The third frame is directly below the second frame and connected to the second frame via the Z-direction strain beam. The third frame is fixedly connected to the aircraft model via four fixed end mounting bases on the outside of the frame.

[0010] The floating measurement platform is connected to the model end mounting base of the measuring balance body via a connecting device; a closed outer shell covers the outside of the floating measurement platform and the measuring balance body.

[0011] Strain gauges are attached to the Y-direction strain beam, X-direction strain beam, and Z-direction strain beam.

[0012] Furthermore, the enclosed shell is a stepped cylindrical shape.

[0013] Furthermore, the upper surface of the enclosed shell is hollow and flush with the measuring surface of the floating head.

[0014] Furthermore, the radial gap between the enclosed outer shell and the floating measurement platform is less than 0.1 mm.

[0015] Furthermore, the strain gauges include a first strain gauge, a second strain gauge, a third strain gauge, a fourth strain gauge, a fifth strain gauge, a sixth strain gauge, a seventh strain gauge, an eighth strain gauge, a ninth strain gauge, a tenth strain gauge, an eleventh strain gauge, a twelfth strain gauge, a thirteenth strain gauge, a fourteenth strain gauge, a fifteenth strain gauge, and a sixteenth strain gauge;

[0016] The first and second strain gauges are pasted in opposite directions at the middle of the Y-direction strain beam, and the third and fourth strain gauges are pasted in opposite directions at the same position on another Y-direction strain beam symmetrical about the xoz plane of the coordinate system.

[0017] The fifth and sixth strain gauges are attached in opposite directions at the middle of the X-direction strain beam. The seventh and eighth strain gauges are attached in the same position in opposite directions on another X-direction strain beam that is symmetrical about the yoz plane of the coordinate system.

[0018] On one side of the Z-direction strain beam, the ninth and tenth strain gauges are attached in opposite directions at the planar end. On the other side of the same Z-direction strain beam, the eleventh and twelfth strain gauges are attached in opposite directions at the same position. On the other side of the Z-direction strain beam, which is symmetrical about the xoz plane of the coordinate system, the thirteenth and fourteenth strain gauges are attached in opposite directions at the same position. On the other side of the same Z-direction strain beam, the fifteenth and sixteenth strain gauges are attached in opposite directions at the same position.

[0019] Option 2: A method for using a sensitivity-enhancing structural balance for measuring minute loads, specifically including the following steps:

[0020] S1. Conduct preliminary screening and select strain gauges with similar resistance and sensitivity from the same batch;

[0021] S2. The first strain gauge and the third strain gauge are used as a pair of arms, and the second strain gauge and the fourth strain gauge are used as another pair of arms to form a Wheatstone bridge. At the same time, a temperature-sensitive first compensation resistor is connected in series on the single arm of the first strain gauge. The resistor is used for temperature compensation. The bridge is named U1.

[0022] S3. The fifth and seventh strain gauges are used as a pair of arms, and the sixth and eighth strain gauges are used as another pair of arms to form a Wheatstone bridge. At the same time, a second compensation resistor that is sensitive to temperature is connected in series on the single arm of the fifth strain gauge. The resistor is used for temperature compensation. The bridge is named U2.

[0023] S4. The ninth and eleventh strain gauges are used as one pair of arms, and the tenth and twelfth strain gauges are used as another pair of arms to form a Wheatstone bridge. At the same time, a temperature-sensitive third compensation resistor is connected in series on the single arm of the ninth strain gauge. The resistor is used for temperature compensation. The bridge is named U3.

[0024] The thirteenth and fifteenth strain gauges form a pair, and the fourteenth and sixteenth strain gauges form another pair to form a Wheatstone bridge, which is named U4.

[0025] S5. Set the air friction resistance voltage signal to U, which is in the same direction as the gas flow. Y The aerodynamic voltage signal perpendicular to this direction on the horizontal plane is U. X The differential pressure resistance voltage signal perpendicular to the measuring surface of the floating head is U. Z , then U Y U X U Z The bridge construction formula is:

[0026] U Y =U1;

[0027] U X =U2;

[0028] U Z =U 3+ U4;

[0029] S6. The balance working formula is obtained through calibration, and the main coefficients and interference term coefficients of the balance are obtained;

[0030] The working formula for a balance is:

[0031] ; ;

[0032] in This represents the actual working load of the balance. For the applied standard load, For the increment of the output signal value, The interference coefficient of the first-order term. The interference coefficient is the quadratic term.

[0033] S7. U X Multiplying by the main coefficient of the balance yields the minute resistance data, U Y Multiply by the principal coefficient of the balance to obtain the force measurement data, U Z Multiply by the main coefficient of the balance to obtain the pressure resistance data.

[0034] The present invention has the following advantages over the prior art:

[0035] 1. By setting anti-interference joints at both ends of the transmission rod, this invention can effectively block the transmission of the remaining force other than the aerodynamic resistance in the direction of the incoming flow to the measuring balance, reduce the influence of irrelevant interference on the core measurement results, and ensure the relevance of the measurement;

[0036] 2. The measuring balance in this invention adopts a novel frame structure. Through a special strain beam arrangement, the measurement of minute aerodynamic forces is converted into corresponding torque measurements, which increases the structural strain. At the same time, the semiconductor strain gauge is used to increase the sensitivity of the balance. While reducing the volume, the measurability of the balance output is ensured, which meets the dual requirements of the test scenario for equipment miniaturization and data acquisition.

[0037] 3. The static calibration accuracy of the balance in this invention is better than 0.4%, which provides a reliable guarantee for the accuracy of the measurement results of micro-loads. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0039] Figure 1 This is a schematic diagram of the coordinate system of a sensitivity-enhancing balance used for measuring minute loads, with the arrow pointing in the direction of the incoming flow.

[0040] Figure 2 An exploded view of a sensitized structural balance used for measuring minute loads;

[0041] Figure 3 This is a schematic diagram of the structure of a floating measurement platform;

[0042] Figure 4 This is a schematic diagram of the structure of a measuring balance.

[0043] Figure 5 This is a diagram showing the location where the strain gauges are attached.

[0044] In the diagram: 1-Floating measurement platform, 11-Floating head measuring surface, 12-Floating head mounting base, 13-Connecting device, 14-"I" type noise reduction joint, 15-"Double Z" type noise reduction joint, 16-Transmission rod, 2-Measuring balance body, 21-Model end mounting base, 22-Y-direction strain beam, 23-First frame, 24-X-direction strain beam, 25-Second frame, 26-Z-direction strain beam, 27-Third frame, 28-Fixed end mounting base, 3-Enclosure Casing, 41-First strain gauge, 42-Second strain gauge, 43-Third strain gauge, 44-Fourth strain gauge, 45-Fifth strain gauge, 46-Sixth strain gauge, 47-Seventh strain gauge, 48-Eighth strain gauge, 49-Ninth strain gauge, 50-Tenth strain gauge, 51-Eleventh strain gauge, 52-Twelfth strain gauge, 53-Thirteenth strain gauge, 54-Fourteenth strain gauge, 55-Fifteenth strain gauge, 56-Sixteenth strain gauge. Detailed Implementation

[0045] To make the technical solutions and advantages of the embodiments of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] Example 1, Reference Figures 1-5 This embodiment describes a sensitive-enhancing balance for measuring minute loads, comprising a floating measuring platform 1, a measuring balance body 2, and a closed outer shell 3.

[0047] The floating measurement platform 1 includes a floating head measuring surface 11, a floating head mounting base 12, a connecting device 13, an "I"-shaped interference suppression joint 14, a "double Z"-shaped interference suppression joint 15, and a transmission rod 16. The floating head measuring surface 11 is connected to the top of the transmission rod 16 via the "I"-shaped interference suppression joint 14, and the bottom of the transmission rod 16 is connected to the floating head mounting base 12 via the "double Z"-shaped interference suppression joint 15. The floating head mounting base 12 is mounted on the connecting device 13. The "I"-shaped interference suppression joint 14 weakens the remaining forces in the non-frictional resistance direction to avoid measurement interference, while the "double Z"-shaped interference suppression joint 15 enhances the interference suppression effect.

[0048] The measuring balance body 2 includes a model end mounting base 21, a Y-direction strain beam 22, a first frame 23, an X-direction strain beam 24, a second frame 25, a Z-direction strain beam 26, a third frame 27, and a fixed end mounting base 28. The model end mounting base 21 is connected to the first frame 23 through the Y-direction strain beam 22. The first frame 23 and the second frame 25 are connected in a "U" shape through the X-direction strain beam 24. The third frame 27 is directly below the second frame 25 and connected to the second frame 25 through the Z-direction strain beam 26. The third frame 27 is fixedly connected to the aircraft model through four fixed end mounting bases 28 on the outside of the frame.

[0049] The floating measurement platform 1 is connected to the model end mounting base 21 of the measuring balance body 2 via the connecting device 13; the enclosed shell 3 covers the outside of the floating measurement platform 1 and the measuring balance body 2.

[0050] Strain gauges are attached to the Y-direction strain beam 22, X-direction strain beam 24 and Z-direction strain beam 26.

[0051] Furthermore, the enclosed outer shell 3 is a stepped cylindrical shape.

[0052] Furthermore, the upper surface of the enclosed shell 3 is hollow and flush with the measuring surface 11 of the floating head.

[0053] Furthermore, the gap between the enclosed outer shell 3 and the floating measurement platform 1 in the radial direction is less than 0.1 mm, in order to avoid the generation of crossflow.

[0054] Furthermore, the strain gauges include a first strain gauge 41, a second strain gauge 42, a third strain gauge 43, a fourth strain gauge 44, a fifth strain gauge 45, a sixth strain gauge 46, a seventh strain gauge 47, an eighth strain gauge 48, a ninth strain gauge 49, a tenth strain gauge 50, an eleventh strain gauge 51, a twelfth strain gauge 52, a thirteenth strain gauge 53, a fourteenth strain gauge 54, a fifteenth strain gauge 55, and a sixteenth strain gauge 56;

[0055] The first strain gauge 41 and the second strain gauge 42 are pasted in opposite directions at the middle part of the Y-direction strain beam 22. The third strain gauge 43 and the fourth strain gauge 44 are pasted in opposite directions at the same position on another Y-direction strain beam 22 that is symmetrical about the xoz plane of the coordinate system.

[0056] The fifth strain gauge 45 and the sixth strain gauge 46 are attached to the middle position of the X-direction strain beam 24 in opposite directions. The seventh strain gauge 47 and the eighth strain gauge 48 are attached to the same position in opposite directions on another X-direction strain beam 24 that is symmetrical about the yoz plane of the coordinate system.

[0057] On one side of the Z-direction strain beam 26, the ninth strain gauge 49 and the tenth strain gauge 50 are attached to opposite sides of the plane. On the other side of the same Z-direction strain beam 26, the eleventh strain gauge 51 and the twelfth strain gauge 52 are attached to opposite sides of the plane. On the other side of the Z-direction strain beam 26, which is symmetrical about the xoz plane of the coordinate system, the thirteenth strain gauge 53 and the fourteenth strain gauge 54 are attached to opposite sides of the plane. On the other side of the same Z-direction strain beam 26, the fifteenth strain gauge 55 and the sixteenth strain gauge 56 are attached to opposite sides of the plane.

[0058] Furthermore, the model end mounting base 21 transmits the aerodynamic force of the floating measurement platform 1 to the measuring balance body 2, decomposing the aerodynamic force acting on the balance; the frictional resistance parallel to the x-axis generates a torsional strain M around the y-axis on the Y-direction strain beam 22 between the model end mounting base 21 and the first frame 23. y The drag parallel to the y-axis generates a torsional strain M around the x-axis on the X-direction strain beam 24 between the first frame 23 and the second frame 25. x The pressure difference resistance parallel to the z-axis generates tensile and compressive strain on the Z-direction strain beam 26 between the second frame 25 and the third frame 27.

[0059] The frictional resistance measurement principle of this embodiment is as follows: A floating measurement platform 1 serves as the measuring and sensing device, transmitting a minute resistance F parallel to the X direction. X The force is amplified and transmitted to the measuring balance 2 via the transmission rod 16. The upper model end mounting base 21 of the measuring balance 2 is the force-bearing part. In this example, the structure realizes the transmission of a small resistance F. X The strain is converted into torsional deformation and applied to the Y-direction strain beam 22. Strain changes are measured through the strain gauge bridge U1; except for the minute resistance F X External interference F Y Strain changes are measured on the X-direction strain beam 24 via strain gauge bridge U2, and the measurement results are decoupled; pressure resistance F Z A pressure perpendicular to the Z-axis is applied to the measuring balance body 2, while tensile and compressive deformation occurs at both ends of the Z-direction strain beam 26. The strain change is measured through the strain gauge bridge circuits U3 and U4.

[0060] Example 2, Reference Figures 1-5 This embodiment describes a method for using a sensitivity-enhancing structural balance for measuring minute loads, specifically including the following steps:

[0061] S1. Conduct preliminary screening and select strain gauges with similar resistance and sensitivity from the same batch;

[0062] S2. The first strain gauge 41 and the third strain gauge 43 are used as a pair of arms, and the second strain gauge 42 and the fourth strain gauge 44 are used as another pair of arms to form a Wheatstone bridge. At the same time, a temperature-sensitive first compensation resistor is connected in series on the single arm of the first strain gauge 41. The resistor is used for temperature compensation. The bridge is named U1.

[0063] S3. The fifth strain gauge 45 and the seventh strain gauge 47 are used as a pair of arms, and the sixth strain gauge 46 and the eighth strain gauge 48 are used as another pair of arms to form a Wheatstone bridge. At the same time, a second compensation resistor that is sensitive to temperature is connected in series on a single arm of the fifth strain gauge 45. The resistor is used for temperature compensation. The bridge is named U2.

[0064] S4. The ninth strain gauge 49 and the eleventh strain gauge 51 are used as a pair of arms, and the tenth strain gauge 50 and the twelfth strain gauge 52 are used as another pair of arms to form a Wheatstone bridge. At the same time, a temperature-sensitive third compensation resistor is connected in series on a single arm of the ninth strain gauge 49. The resistor is used for temperature compensation. The bridge is named U3.

[0065] The thirteenth strain gauge 53 and the fifteenth strain gauge 55 are used as one pair of arms, and the fourteenth strain gauge 54 and the sixteenth strain gauge 56 are used as another pair of arms to form a Wheatstone bridge, which is named U4.

[0066] S5. Set the air friction resistance voltage signal to U, which is in the same direction as the gas flow. Y The aerodynamic voltage signal perpendicular to this direction on the horizontal plane is U. X The differential pressure resistance voltage signal perpendicular to the floating head measuring surface 11 is U. Z , then U Y U X U Z The bridge construction formula is:

[0067] U Y =U1;

[0068] U X =U2;

[0069] U Z =U 3+ U4;

[0070] S6. The balance working formula is obtained through calibration, and the main coefficients and interference term coefficients of the balance are obtained;

[0071] The working formula for a balance is:

[0072] ; ;

[0073] in This represents the actual working load of the balance. For the applied standard load, For the increment of the output signal value, The interference coefficient of the first-order term. The interference coefficient is the quadratic term.

[0074] S7. U X Multiplying by the main coefficient of the balance yields the minute resistance data, U Y Multiply by the principal coefficient of the balance to obtain the force measurement data, U Z Multiply by the main coefficient of the balance to obtain the pressure resistance data.

[0075] By incorporating disturbance-eliminating joints at both ends of the transmission rod, this invention effectively blocks the transmission of forces other than aerodynamic resistance in the incoming flow direction to the measuring balance, reducing irrelevant interferences from affecting the core measurement results and ensuring the accuracy of the measurements.

[0076] The novel frame structure of the balance body in this invention, through a special strain beam arrangement, transforms the measurement of minute aerodynamic forces into corresponding torque measurements, increasing the structural strain. Simultaneously, the use of semiconductor strain gauges enhances the balance's sensitivity. This reduces the size while ensuring the measurability of the balance's output, meeting the dual requirements of miniaturization and data acquisition in experimental scenarios. Furthermore, the static calibration accuracy of the balance in this invention is better than 0.4%, providing a reliable guarantee for the accuracy of minute load measurement results.

[0077] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A sensitive structure balance for micro load measurement, characterized in that, It comprises a floating measuring platform (1), a measuring balance body (2) and a closed shell (3). The floating measuring platform (1) comprises a floating head measuring surface (11), a floating head mounting base (12), a connecting device (13), an "I" type disturbance elimination joint (14), a "double Z" type disturbance elimination joint (15) and a transmission rod (16), the floating head measuring surface (11) is connected with the top of the transmission rod (16) through the "I" type disturbance elimination joint (14), the bottom of the transmission rod (16) is connected with the floating head mounting base (12) through the "double Z" type disturbance elimination joint (15), and the floating head mounting base (12) is mounted on the connecting device (13). The measuring balance body (2) comprises a model end mounting base (21), a Y direction strain beam (22), a first frame body (23), an X direction strain beam (24), a second frame body (25), a Z direction strain beam (26), a third frame body (27) and a fixed end mounting base (28), the model end mounting base (21) is connected with the first frame body (23) through the Y direction strain beam (22), the first frame body (23) and the second frame body (25) are connected through the X direction strain beam (24) in a "U" shape, the third frame body (27) is connected with the second frame body (25) through the Z direction strain beam (26) directly below the second frame body (25), and the third frame body (27) is fixedly connected with an aircraft model through four fixed end mounting bases (28) outside the frame body. The floating measuring platform (1) is connected with the model end mounting base (21) of the measuring balance body (2) through the connecting device (13), and the closed shell (3) covers the outside of the floating measuring platform (1) and the measuring balance body (2). Strain gauges are attached to the Y direction strain beam (22), the X direction strain beam (24) and the Z direction strain beam (26).

2. The sensitive structure balance for micro-load measurement according to claim 1, characterized in that, The closed shell (3) is a stepped cylinder.

3. The sensitive structure balance for micro-load measurement according to claim 2, characterized in that, The upper surface of the closed shell (3) is hollow and flush with the floating head measuring surface (11).

4. The sensitive structure balance for micro-load measurement according to claim 3, characterized in that, The gap between the radial direction of the closed shell (3) and the floating measuring platform (1) is less than 0.1 mm.

5. The sensitive structure balance for micro-load measurement according to claim 1, characterized in that, The strain gauges comprise a first strain gauge (41), a second strain gauge (42), a third strain gauge (43), a fourth strain gauge (44), a fifth strain gauge (45), a sixth strain gauge (46), a seventh strain gauge (47), an eighth strain gauge (48), a ninth strain gauge (49), a tenth strain gauge (50), an eleventh strain gauge (51), a twelfth strain gauge (52), a thirteenth strain gauge (53), a fourteenth strain gauge (54), a fifteenth strain gauge (55) and a sixteenth strain gauge (56). The first strain gauge (41) and the second strain gauge (42) are symmetrically attached to the middle part of the Y direction strain beam (22), and the third strain gauge (43) and the fourth strain gauge (44) are symmetrically attached to the same position on the other Y direction strain beam (22) with respect to the xoz plane of the coordinate system. The fifth strain gauge (45) and the sixth strain gauge (46) are symmetrically pasted on the middle part of the X-direction strain beam (24), and the seventh strain gauge (47) and the eighth strain gauge (48) are symmetrically pasted on the other X-direction strain beam (24) which is symmetric about the yoz plane; The ninth strain gauge (49) and the tenth strain gauge (50) are symmetrically pasted on the plane end of the Z-direction strain beam (26) on one side, the eleventh strain gauge (51) and the twelfth strain gauge (52) are symmetrically pasted on the other end of the same Z-direction strain beam (26), the thirteenth strain gauge (53) and the fourteenth strain gauge (54) are symmetrically pasted on the same position of the Z-direction strain beam (26) on the other side which is symmetric about the xoz plane, and the fifteenth strain gauge (55) and the sixteenth strain gauge (56) are symmetrically pasted on the other end of the same Z-direction strain beam (26).

6. The use method of the sensitive structure balance for micro load measurement according to claim 5, specifically comprising the following steps: S1. Preliminary screening is performed to select strain gauges with similar resistance and sensitivity in the same batch; S2. The first strain gauge (41) and the third strain gauge (43) are used as a pair of arms, the second strain gauge (42) and the fourth strain gauge (44) are used as another pair of arms to form a Wheatstone bridge, a first temperature-sensitive compensation resistor is connected in series on the single arm of the first strain gauge (41) as temperature compensation, and the bridge is named as U1; S3. The fifth strain gauge (45) and the seventh strain gauge (47) are used as a pair of arms, the sixth strain gauge (46) and the eighth strain gauge (48) are used as another pair of arms to form a Wheatstone bridge, a second temperature-sensitive compensation resistor is connected in series on the single arm of the fifth strain gauge (45) as temperature compensation, and the bridge is named as U2; S4. The ninth strain gauge (49) and the eleventh strain gauge (51) are used as a pair of arms, the tenth strain gauge (50) and the twelfth strain gauge (52) are used as another pair of arms to form a Wheatstone bridge, a third temperature-sensitive compensation resistor is connected in series on the single arm of the ninth strain gauge (49) as temperature compensation, and the bridge is named as U3; The thirteenth strain gauge (53) and the fifteenth strain gauge (55) are used as a pair of arms, the fourteenth strain gauge (54) and the sixteenth strain gauge (56) are used as another pair of arms to form a Wheatstone bridge, and the bridge is named as U4; S5. Set the air friction resistance voltage signal in the same direction as the gas flow as U Y , the aerodynamic force voltage signal of the horizontal plane perpendicular to the direction as U X , the differential pressure resistance voltage signal perpendicular to the floating head measuring surface (11) as U Z , then the group bridge formula of U Y , U X , U Z is: U Y = U1; U X = U2; U Z =U 3+ U4; S6. The balance working formula is obtained through calibration to obtain the main coefficient and the interference term coefficient of the balance; The balance working formula is: ； ； wherein is the actual working load of the balance, is the applied standard load, is the output signal value increment, is the linear interference coefficient, is the quadratic interference coefficient; S7. U X Multiplying by the main coefficient of the balance yields the minute resistance data, U Y Multiply by the principal coefficient of the balance to obtain the force measurement data, U Z Multiply by the main coefficient of the balance to obtain the pressure resistance data.

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