A rod-type six-component high-precision micro roll moment wind tunnel balance and measurement method

Abstract

A rod-type six-component high-precision micro roll moment wind tunnel balance and measurement method, belonging to the technical field of dynamic measurement in aerospace force measurement tests. The present invention solves the problems that the current research and development of micro roll moment balances have large processing difficulties and long processing cycles, and cannot meet the requirements of aviation tests. Longitudinal column beams, transverse column beams and roll-on cross beams are respectively connected between the front cone and the rear cone of the present invention and the combined element. A drag beam is arranged on the combined element. The thickness range of the sheet beams of the multi-sheet structure of the longitudinal column beam is 0.5 mm to 0.8 mm, and the sheet beam gap range is 0.5 mm to 1 mm. The thickness of the sheet beams of the multi-sheet structure of the transverse column beam is 0.5 mm to 0.8 mm, and the sheet beam gap range is 0.5 mm to 1 mm. The rod-type six-component high-precision micro roll moment wind tunnel balance and measurement method of the present invention effectively increases the roll output and realizes the matching output of small roll moments and loads in other directions.

Description

Technical Field

[0001] The present invention belongs to the technical field of dynamic measurement in aerospace force measurement tests, and specifically relates to a rod-type six-component high-precision micro-roll moment wind tunnel balance and a measurement method. Background Art

[0002] The rod-type six-component balance used in wind tunnel force measurement tests can directly measure the aerodynamic forces and moments acting on an aircraft model, and is one of the most critical high-precision sensors in force measurement wind tunnel tests. For certain types of aircraft tests, such as wind tunnel tests of tactical missile models, the measurement of micro-roll moments caused by the appearance of asymmetric vortices at large angles of attack, and the measurement of small roll moments of small asymmetric warheads and ablated shapes, etc., there are situations where the roll moment of the model is too small and does not match other loads.

[0003] Currently, although there have been preliminary theoretical results in the research and development of micro-roll moment balances, these solutions all have the problems of high processing difficulty and long processing cycle, and cannot meet the urgent needs of aviation tests. The specific technical drawbacks are mainly as follows:

[0004] Patent publication number CN114323546B discloses a high-sensitivity rod-type six-component wind tunnel test balance with different materials inlaid. This patent uses different materials to improve the sensitivity of the roll element of the balance, but there are the following drawbacks: 1) The processing requirements are extremely high, and the geometric tolerance deviation of the assembly surface has an adverse effect on the measurement of the balance; 2) The effect of improving sensitivity is limited, and using materials such as 7075 described in this patent reduces the strength of the balance.

[0005] Patent publication number CN112525481A discloses a six-component high-precision micro-roll moment measurement device and a measurement method. This patent mainly uses the method of air bearings, but the complexity and its own characteristics of the key component air bearing structure are difficult to achieve, and the space for high-speed test models is limited, and it is basically difficult to implement the air bearing solution.

[0006] Therefore, the present application proposes a rod-type six-component high-precision micro-roll moment wind tunnel and a measurement method to solve the above problems. Summary of the Invention

[0007] The research and development purpose of the present invention is to solve the problems that the current research and development of micro-roll moment balances have high processing difficulty, long processing cycle, and cannot meet aviation tests. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0008] The technical solution of the present invention:

[0009] Solution 1: A rod-type six-component high-precision micro-roll moment wind tunnel balance, comprising a front cone, a rear cone and a combined component. The front cone and the rear cone are respectively arranged on both sides of the combined component. Longitudinal column beams, transverse column beams and roll cross-shaped beams are respectively connected between the front cone and the combined component. Longitudinal column beams, transverse column beams and roll cross-shaped beams are connected between the rear cone and the combined component. A drag beam is arranged on the combined component, and drag support beams are arranged on both sides of the drag beam. The longitudinal column beams are longitudinally arranged in a multi-sheet structure, and the thickness range of each sheet beam of the multi-sheet structure is 0.5 mm to 0.8 mm, and the sheet beam gap range is 0.5 mm to 1 mm. The transverse column beams are transversely arranged in a multi-sheet structure, and the thickness of each sheet beam of the multi-sheet structure is 0.5 mm to 0.8 mm, and the sheet beam gap range is 0.5 mm to 1 mm.

[0010] Further, the longitudinal column beams include a front upper longitudinal column beam, a front lower longitudinal column beam, a rear upper longitudinal column beam and a rear lower longitudinal column beam. The front upper longitudinal column beam and the front lower longitudinal column beam are arranged between the front cone and the combined component, and the rear upper longitudinal column beam and the rear lower longitudinal column beam are arranged between the rear cone and the combined component.

[0011] Further, the transverse column beams include a left front transverse column beam, a right front transverse column beam, a left rear transverse column beam and a right rear transverse column beam. The left front transverse column beam and the right front transverse column beam are arranged between the front cone and the combined component, and the left rear transverse column beam and the right rear transverse column beam are arranged between the rear cone and the combined component.

[0012] Further, damping thin sheets are arranged on both sides of the roll cross-shaped beam, and the thickness range of the damping thin sheets is 0.5 mm to 0.8 mm.

[0013] Further, a plurality of first strain gauges are pasted on the longitudinal column beams, a plurality of second strain gauges are pasted on the drag beam, a plurality of third strain gauges are pasted on the transverse column beams, and a plurality of fourth strain gauges are pasted on the roll cross-shaped beam.

[0014] Solution 2: A method for measuring a rod-type six-component high-precision micro-roll moment wind tunnel balance, which is realized based on the rod-type six-component high-precision micro-roll moment wind tunnel balance described in Solution 1, and includes the following steps:

[0015] Step 1: Paste 4 first strain gauges on the middle upper and lower end surfaces between the front upper longitudinal column beam and the front lower longitudinal column beam to form a Wheatstone bridge, and this bridge is defined as U 1 ;

[0016] Step 2: Paste 4 second strain gauges on the middle upper and lower end surfaces between the rear upper longitudinal column beam and the rear lower main longitudinal beam to form a Wheatstone bridge, and this bridge is defined as U 2 ;

[0017] Step 3: Paste 4 third strain gauges on the left and right end faces between the left-front transverse main beam and the right-front transverse column beam to form a Wheatstone bridge, which is defined as U 3 ;

[0018] Step 4: Paste 4 third strain gauges on the left and right end faces between the left-rear transverse column beam and the right-rear transverse main beam to form a Wheatstone bridge, which is defined as U 4 ;

[0019] Step 5: Paste 8 fourth strain gauges on the roll cross beam to form a Wheatstone bridge, which is positioned as U 5 ;

[0020] Step 6: Paste a total of 4 second strain gauges on the drag beam to form a Wheatstone bridge, which is positioned as U 6 ;

[0021] Step 7: Calibrate the balance. The six-component load received by the balance is determined by the following formula:

[0022] ;

[0023] ;

[0024] ;

[0025] ;

[0026] ;

[0027] ;

[0028] where Y is the lift of the balance, Mz is the pitching moment of the balance, Z is the side force of the balance, My is the yaw moment of the balance, Mx is the roll moment of the balance, and X is the drag of the balance.

[0029] The present invention has the following beneficial effects:

[0030] 1. A rod-type six-component high-precision micro roll moment wind tunnel balance of the present invention, through the processing of the multi-piece structure of the longitudinal main beam and the transverse main beam, effectively increases the roll output on the premise of ensuring that the longitudinal and transverse stiffnesses remain basically unchanged, realizes the matching output of small roll moments and loads in other directions. Compared with the existing technical solutions, the external dimensions of the balance will not change significantly, which is easy to realize the design of the force measurement model. The balance does not adopt additional assembly, welding and other processes, and will not generate additional interference stresses;

[0031] 2. For the rod - type six - component high - precision micro - roll moment wind tunnel balance of the present invention, anti - interference thin sheets are machined on the roll cross - shaped beam for measuring the roll moment, which can reduce the influence of loads in other directions on the measurement of the roll moment and improve the accuracy of the roll moment measurement.

[0032] 3. The measurement method of the rod - type six - component high - precision micro - roll moment wind tunnel balance of the present invention can achieve accurate measurement of the micro - roll moment, effectively solve the influence of loads in other directions on the measurement of the micro - roll moment, and avoid the problem of high processing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the front view of a rod - type six - component high - precision micro - roll moment wind tunnel balance;

[0034] Figure 2 is the top view of a rod - type six - component high - precision micro - roll moment wind tunnel balance;

[0035] Figure 3 is Figure 1 the sectional view taken along A - A in

[0036] Figure 4 is the partial schematic diagram of the longitudinal column beam;

[0037] Figure 5 is the partial schematic diagram of the transverse column beam;

[0038] Figure 6 the partial schematic diagram of the roll cross - shaped beam;

[0039] Figure 7 is the schematic diagram of the longitudinal column beam, the drag beam and the strain gauge;

[0040] Figure 8 is the schematic diagram of the transverse column beam and the strain gauge;

[0041] Figure 9 is the schematic diagram of the roll cross - shaped beam and the strain gauge;

[0042] Figure 10 is the Wheatstone bridge circuit diagram of the longitudinal column beam;

[0043] Figure 11 is the Wheatstone bridge circuit diagram of the transverse column beam;

[0044] Figure 12 is the Wheatstone bridge circuit diagram of the roll cross - shaped beam;

[0045] Figure 13 is the Wheatstone bridge circuit diagram of the drag beam.

[0046] In the figure: 1 - longitudinal column beam, 2 - transverse column beam, 3 - damping sheet, 4 - rotating cross beam, 5 - resistance support beam, 6 - resistance beam, 7 - front cone, 8 - rear cone, 9 - combined component, 11 - front upper longitudinal column beam, 12 - front lower longitudinal column beam, 13 - rear upper longitudinal column beam, 14 - rear lower longitudinal column beam, 21 - left front transverse column beam, 22 - right front transverse column beam, 23 - left rear transverse column beam, 24 - right rear transverse column beam, 31 - first strain gauge, 32 - second strain gauge, 33 - third strain gauge, 34 - fourth strain gauge. Detailed implementation mode

[0047] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0048] The connections mentioned in the present invention are divided into fixed connections and detachable connections. The fixed connections (i.e., non-detachable connections) include but are not limited to conventional fixed connection methods such as hemming connection, rivet connection, bonding connection and welding connection, etc. The detachable connections include but are not limited to conventional disassembly methods such as threaded connection, snap connection, pin connection and hinge connection, etc. When the specific connection method is not clearly defined, it is defaulted that at least one connection method can always be found among the existing connection methods to achieve this function, and those skilled in the art can select according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0049] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example 1, in combination with Figures 1-9Describing this embodiment, a rod-type six-component high-precision micro-roll moment wind tunnel balance of this embodiment includes a front cone 7, a rear cone 8 and a combined element 9. The front cone 7 and the rear cone 8 are respectively arranged on both sides of the combined element 9. A longitudinal column beam 1, a transverse column beam 2 and a roll cross beam 4 are respectively connected between the front cone 7 and the combined element 9. A longitudinal column beam 1, a transverse column beam 2 and a roll cross beam 4 are connected between the rear cone 8 and the combined element 9. A drag beam 6 is arranged on the combined element 9, and drag support beams 5 are arranged on both sides of the drag beam 6. The longitudinal column beam 1 is longitudinally arranged in a multi-sheet structure. The thickness range of each sheet beam of the multi-sheet structure is 0.5 mm to 0.8 mm, and the gap range between the sheet beams is 0.5 mm to 1 mm. The transverse column beam 2 is transversely arranged in a multi-sheet structure. The thickness of each sheet beam of the multi-sheet structure is 0.5 mm to 0.8 mm, and the gap range between the sheet beams is 0.5 mm to 1 mm. Four second strain gauges 32 are pasted on the drag beam 6 to form a Wheatstone bridge.

[0051] The longitudinal main beam 1 is arranged on the upper and lower sides of the axis, symmetrically arranged along the horizontal plane, and divided into left and right parts, which play the role of measuring longitudinal loads, that is, lift and pitch moment. There are a total of 4 longitudinal column beams 1. The front upper longitudinal column beam 11 and the front lower longitudinal column beam 12 are arranged between the front cone 7 and the combined element 9. The rear upper longitudinal column beam 13 and the rear lower longitudinal column beam 14 are arranged between the rear cone 8 and the combined element 9. The front and rear ends of the longitudinal main beam 1 are designed as a multi-sheet structure, longitudinally arranged. The thickness of each beam of the multi-sheet structure is 0.5 mm to 0.8 mm, and the gap is 0.5 mm to 1 mm. The number of the multi-sheet structures is determined according to the load. Four first strain gauges 31 are respectively pasted on the front upper longitudinal column beam 11 and the front lower longitudinal column beam 12 to form a Wheatstone bridge. Four first strain gauges 31 are also respectively pasted on the rear upper longitudinal column beam 13 and the rear lower longitudinal column beam 14 to form a Wheatstone bridge.

[0052] The transverse column beam 2 is arranged on the left and right sides of the axis, symmetrically arranged along the vertical plane, and divided into upper and lower parts, which play the role of measuring transverse loads, that is, side force and yaw moment. There are a total of 4 transverse column beams 2. The left front transverse column beam 21 and the right front transverse column beam 22 are arranged between the front cone 7 and the combined element 9. The left rear transverse column beam 23 and the right rear transverse column beam 24 are arranged between the rear cone 7 and the combined element 9. The front and rear ends of the transverse column beam 2 are designed as a multi-sheet structure, transversely arranged. The thickness of each sheet beam of the multi-sheet structure is 0.5 mm to 0.8 mm, and the gap is 0.5 mm to 1 mm. The number of the multi-sheet structures is determined according to the load. Four third strain gauges 33 are respectively pasted on the left front transverse column beam 21 and the right front transverse column beam 22. Four third strain gauges 33 are also respectively pasted on the left rear transverse column beam 23 and the right rear transverse column beam 24 to form a Wheatstone bridge.

[0053] There are four roll cross beams 4, which are symmetrically arranged along the central axis and rotate. The thickness is determined according to the load, and the length is greater than that of the longitudinal column beam 1 and the transverse column beam 2, playing the role of measuring the roll moment. At the same time, the damping thin plates 3 are arranged on both sides of the roll cross beam 4. The thickness of the damping thin plates 3 is between 0.5 mm and 0.8 mm, and the length of the damping thin plates 3 is determined according to the space designed by the balance size, playing the role of eliminating the interference of the loads in other directions on the roll cross beam 4. Eight fourth strain gauges 34 are pasted on the end face of the rear roll cross beam 4 to form a Wheatstone bridge.

[0054] Example 1, combined with Figures 1-13 To illustrate this example, a method for measuring the roll moment of a rod-type six-component high-precision micro roll moment wind tunnel balance in this example includes the following steps:

[0055] Step 1: Paste 4 first strain gauges 31 on the upper and lower end face surfaces in the middle of the front upper longitudinal column beam 11 and the front lower longitudinal column beam 12 to form a Wheatstone bridge, and this bridge is defined as U 1 ;

[0056] Step 2: Paste 4 second strain gauges 32 on the upper and lower end face surfaces in the middle of the rear upper longitudinal column beam 13 and the rear lower main longitudinal beam 14 to form a Wheatstone bridge, and this bridge is defined as U 2 ;

[0057] Step 3: Paste 4 third strain gauges 33 on the left and right end face surfaces in the middle of the left front transverse main beam 21 and the right front transverse column beam 22 to form a Wheatstone bridge, and this bridge is defined as U 3 ;

[0058] Step 4: Paste 4 third strain gauges 33 on the left and right end face surfaces in the middle of the left rear transverse column beam 23 and the right rear transverse main beam 24 to form a Wheatstone bridge, and this bridge is defined as U 4 ;

[0059] Step 5: Paste 8 fourth strain gauges 34 on the roll cross beam 4 to form a Wheatstone bridge, and this bridge is positioned as U 5 ;

[0060] Step 6: Paste a total of 4 second strain gauges 32 on the drag beam 6 to form a Wheatstone bridge, and this bridge is positioned as U 6 ;

[0061] Step 7: Calibrate the balance. The six-component load received by the balance is determined by the following formula:

[0062] ;

[0063] ;

[0064] ;

[0065] ;

[0066] ;

[0067] ;

[0068] Among them, Y is the balance lift force, Mz is the balance pitching moment, Z is the balance side force, My is the balance yaw moment, Mx is the balance roll moment, and X is the balance drag force.

[0069] It should be noted that Figures 10-13 R1 to R28 on each of the attached Wheatstone bridges are all the resistors on the Wheatstone bridges.

[0070] This embodiment is only an exemplary illustration of the present invention and does not limit its protection scope. Those skilled in the art can also make partial changes to it as long as they do not exceed the spirit essence of the present invention, and they are all within the protection scope of the present invention.

Claims

1. A rod-type six-component high-precision micro-roll moment wind tunnel balance, characterized in that: The invention comprises a front cone (7), a rear cone (8) and a combined element (9), wherein the front cone (7) and the rear cone (8) are arranged on both sides of the combined element (9), respectively; a longitudinal column beam (1), a transverse column beam (2) and a rolling cross beam (4) are connected between the front cone (7) and the combined element (9), and a longitudinal column beam (1), a transverse column beam (2) and a rolling cross beam (4) are connected between the rear cone (8) and the combined element (9); a resistance beam (6) is arranged on the combined element (9), and resistance support beams (5) are arranged on both sides of the resistance beam (6); the longitudinal column beam (1) adopts a multi-piece structure for longitudinal arrangement, wherein the thickness of each beam of the multi-piece structure is in the range of 0.5 mm to 0.8 mm, and the gap between the beams is in the range of 0.5 mm to 1 mm; the transverse column beam (2) adopts a multi-piece structure for transverse arrangement, wherein the thickness of each beam of the multi-piece structure is in the range of 0.5 mm to 0.8 mm, and the gap between the beams is in the range of 0.5 mm to 1 mm; The two sides of the rolling crossbeam (4) are provided with thin sheets (3) with a thickness ranging from 0.5 mm to 0.8 mm.

2. A rod-type six-component high-precision micro-roll moment wind tunnel balance according to claim 1, characterized in that: The longitudinal column beam (1) comprises a front upper longitudinal column beam (11), a front lower longitudinal column beam (12), a rear upper longitudinal column beam (13) and a rear lower longitudinal column beam (14); the front upper longitudinal column beam (11) and the front lower longitudinal column beam (12) are arranged between the front cone (7) and the combined element (9), and the rear upper longitudinal column beam (13) and the rear lower longitudinal column beam (14) are arranged between the rear cone (8) and the combined element (9).

3. A rod-type six-component high-precision micro-roll moment wind tunnel balance according to claim 2, characterized in that: The transverse column beam (2) comprises a left front transverse column beam (21), a right front transverse column beam (22), a left rear transverse column beam (23) and a right rear transverse column beam (24); the left front transverse column beam (21) and the right front transverse column beam (22) are arranged between the front cone (7) and the combined element (9); the left rear transverse column beam (23) and the right rear transverse column beam (24) are arranged between the rear cone (8) and the combined element (9).

4. A rod-type six-component high-precision micro-roll moment wind tunnel balance according to claim 3, characterized in that: A plurality of first strain gauges (31) are attached to the longitudinal column beam (1), a plurality of second strain gauges (32) are attached to the resistance beam (6), a plurality of third strain gauges (33) are attached to the transverse column beam (2), and a plurality of fourth strain gauges (34) are attached to the rolling crossbeam (4).

5. A rod-type six-component high-precision micro-rolling moment wind tunnel balance measurement method, which is based on the rod-type six-component high-precision micro-rolling moment wind tunnel balance described in claim 4, and is characterized in that: The following steps are involved: Step 1: Paste four first strain gauges (31) on the upper and lower end surfaces of the front upper longitudinal column beam (11) and the front lower longitudinal column beam (12) to form a Wheatstone bridge, which is defined as U1; Step 2: Paste four second strain gauges (32) on the upper and lower end surfaces of the rear upper longitudinal column beam (13) and the rear lower longitudinal column beam (14) to form a Wheatstone bridge, which is defined as U2; Step 3: Paste four third strain gauges (33) on the left and right end surfaces between the left front transverse column beam (21) and the right front transverse column beam (22) to form a Wheatstone bridge, which is defined as U3; Step 4: Paste four third strain gauges (33) on the left and right end surfaces between the left rear transverse column beam (23) and the right rear transverse column beam (24) to form a Wheatstone bridge, which is defined as U4; Step 5: Paste eight fourth strain gauges (34) on the rolling crossbeam (4) to form a Wheatstone bridge, and the bridge is positioned as U5; Step 6: A total of four second strain gauges (32) are pasted on the resistance beam (6) to form a Wheatstone bridge, and the bridge is positioned as U6; Step 7: Calibrate the balance. The six-element load on the balance is determined by the following formula: U Y =U2-U1 U Mz =U2+U1 IN Z =U3-U4 IN My =U3+U4 U Mx =U5 U X =U6| Among them, Y is the balance lift, Mz is the balance pitch moment, Z is the balance side force, My is the balance yaw moment, Mx is the balance roll moment, and X is the balance drag.

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