Free sinking and floating / pitching supporting system based on magnetic suspension technology

Abstract

The invention discloses a free sinking and floating / pitching supporting system based on a magnetic suspension technology, and belongs to the technical field of wind tunnel tests. According to the invention, the problem that in a sinking and floating / pitching support system in a wind tunnel at present, when the Mach number of incoming flow is relatively high, the support component is blocked or even stuck due to overlarge motion damping is solved. The device comprises a magnetic suspension bearing supporting assembly, a magnetic suspension guide rail supporting assembly and a basic frame assembly, the basic frame assembly is fixed on a side wall plate of a wind tunnel test section, the magnetic suspension guide rail supporting assembly is installed on the basic frame assembly, and the magnetic suspension bearing supporting assembly is connected with the magnetic suspension guide rail supporting assembly. According to the free sinking and floating / pitching supporting system based on the magnetic suspension technology, the problems of abrasion, vibration, heating and friction energy consumption caused by friction generated by mechanical contact can be effectively solved in a non-contact supporting mode of magnetic suspension.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a free sinking / pitching support system based on magnetic levitation technology. Background Art

[0002] Some aircraft with special layouts may experience flutter states different from classic bending and torsional flutter under certain flight conditions. The coupling between the rigid body freedom and the elastic freedom will produce a unique body freedom flutter problem. In order to reproduce this phenomenon in a wind tunnel and solve it, it is necessary to first have a support system that can release the model's heave and pitch freedom.

[0003] In the heave / pitch support systems studied in related fields at home and abroad, when the incoming flow Mach number is high, the support system components will become stuck or even completely stuck due to excessive motion damping and will not be able to move normally.

[0004] Therefore, the present application proposes a free sinking / pitching support system based on magnetic levitation technology. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that in the current heave / pitch support system in the wind tunnel, when the incoming flow Mach number is high, the support components will become stuck or even stuck due to excessive motion damping. 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.

[0006] The technical solution of the present invention: A free sinking / pitching support system based on magnetic levitation technology comprises a magnetic levitation bearing support assembly, a magnetic levitation guide rail support assembly, a basic frame assembly and a model installation adapter. The basic frame assembly is fixed on the side wall plate of a wind tunnel test section, the magnetic levitation guide rail support assembly is installed on the basic frame assembly, the magnetic levitation bearing support assembly is connected to the magnetic levitation guide rail support assembly, and the model installation adapter is installed on the magnetic levitation bearing support assembly.

[0007] Furthermore, the magnetic bearing support assembly includes a rotating shaft, a first radial magnetic bearing, an axial magnetic bearing, a second radial magnetic bearing and a movable mounting seat. The movable mounting seat is connected to the magnetic guide rail support assembly. The rotating shaft is arranged in the movable mounting seat. The first radial magnetic bearing, the axial magnetic bearing and the second radial magnetic bearing are sequentially mounted on the rotating shaft. The model mounting adapter is installed at the end of the rotating shaft.

[0008] Furthermore, a front bearing cover is installed at the front end of the movable mounting seat, and a rear bearing cover is installed at the rear end of the movable mounting seat. A first radial magnetic bearing, an axial magnetic bearing and a second radial magnetic bearing are arranged in sequence between the front bearing cover and the rear bearing cover, and sleeves are respectively arranged between the axial magnetic bearing and the first radial magnetic bearing and the second radial magnetic bearing.

[0009] Furthermore, the first radial magnetic bearing and the second radial magnetic bearing have the same structure, both including a radial magnetic bearing stator, a radial magnetic bearing rotor and a radial magnetic bearing coil. A radial magnetic bearing coil is arranged between the radial magnetic bearing stator and the radial magnetic bearing rotor. The radial magnetic bearing stator is cooperatively connected to the movable mounting seat, and the radial magnetic bearing rotor is cooperatively connected to the rotating shaft.

[0010] Furthermore, the axial magnetic bearing includes a first axial magnetic bearing stator, a second axial magnetic bearing stator, an axial magnetic bearing rotor, a first axial magnetic bearing coil and a second axial magnetic bearing coil. The first axial magnetic bearing stator and the second axial magnetic bearing stator are respectively connected to the outer side of the axial magnetic bearing rotor. The first axial magnetic bearing coil is arranged between the first axial magnetic bearing stator and the axial magnetic bearing rotor, and the second axial magnetic bearing coil is arranged between the second axial magnetic bearing stator and the axial magnetic bearing rotor. The first axial magnetic bearing stator and the second axial magnetic bearing stator are connected to the movable mounting seat, and the axial magnetic bearing rotor is connected to the rotating shaft.

[0011] Furthermore, the basic frame assembly includes a guide rail mounting plate, a longitudinal return steel, a transverse return steel and an end plate. Two longitudinal return steels and two transverse return steels form a rectangular frame and are installed on the back of the guide rail mounting plate. The end surface of the transverse return steel is installed with an end plate. The magnetic levitation guide rail support assembly is installed on the front of the guide rail mounting plate.

[0012] Furthermore, the magnetic levitation guide rail support assembly includes a levitator adapter, a levitator, a magnetic levitation guide rail and a damper. Two magnetic levitation guide rails are symmetrically installed on the guide rail mounting plate. Dampers are respectively installed at the upper and lower ends of each magnetic levitation guide rail. A levitator is respectively installed on each magnetic levitation guide rail. The movable mounting seat is connected to the levitator through the levitator adapter.

[0013] Furthermore, the first radial magnetic bearing, the axial magnetic bearing and the second radial magnetic bearing are electromagnetic bearings or hybrid magnetic bearings.

[0014] Furthermore, the damper is a spring damper, a hydraulic damper or a pneumatic damper.

[0015] The present invention has the following beneficial effects: 1. In a free sinking / pitching support system based on magnetic levitation technology of the present invention, magnetic levitation utilizes a magnetic field to stably suspend mechanical motion in space. It uses a magnetic field as a medium, and can generate force without physical contact between the magnet and the suspended target. This non-contact support method can effectively solve the problems of wear, vibration, heat and friction energy consumption caused by friction generated by mechanical contact.

[0016] 2. In the free sinking / pitching support system based on magnetic levitation technology of the present invention, the movable pair composed of the levitator and the magnetic levitation guide rail of the magnetic levitation guide rail support assembly and the rotating pair composed of the rotating shaft and the radial magnetic levitation bearing of the magnetic levitation bearing support assembly realize relative movement between the components under non-contact conditions. The support system adopts magnetic levitation technology to greatly reduce the motion damping during the movement of the movable mounting seat in the sinking direction and the rotation of the rotating shaft in the pitch direction.

[0017] 3. The free sinking / pitching support system based on magnetic levitation technology of the present invention lays a solid foundation for reproducing the body freedom flutter phenomenon in the wind tunnel and studying and solving the body freedom flutter problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a free sinking / pitching support system based on magnetic levitation technology; Figure 2 It is an exploded view of a free-floating / pitch support system based on magnetic levitation technology; Figure 3 is a cross-sectional view of a magnetic bearing support assembly; Figure 4 is a schematic diagram of a first radial magnetic bearing; Figure 5 It is a solid diagram of an axial magnetic bearing; Figure 6 It is a cross-sectional view of an axial magnetic bearing.

[0019] In the figure: 1-magnetic suspension bearing support assembly, 2-magnetic suspension guide rail support assembly, 3-basic frame assembly, 11-model installation adapter, 12-rotating shaft, 13-front bearing pressure cover, 14-first radial magnetic suspension bearing, 15-sleeve, 16-axial magnetic suspension bearing, 17-second radial magnetic suspension bearing, 18-rear bearing pressure cover, 19-movable mounting seat, 20-suspension device adapter, 21-suspension device, 22-magnetic suspension guide rail, 23-damper, 30-guide rail mounting plate, 31-longitudinal return steel, 32-transverse return steel, 33-end plate, 141-radial magnetic suspension bearing stator, 142-radial magnetic suspension bearing rotor, 143-radial magnetic suspension bearing coil, 161-first axial magnetic suspension bearing stator, 162-second axial magnetic suspension bearing stator, 163-axial magnetic suspension bearing rotor, 164-first axial magnetic suspension bearing coil, 165-second axial magnetic suspension bearing coil. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying 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, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0021] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0022] Embodiment 1, combination Figure 1-Figure 6 The present embodiment is described. A free sinking / pitching support system based on magnetic levitation technology in the present embodiment comprises a magnetic levitation bearing support assembly 1, a magnetic levitation guide rail support assembly 2 and a basic frame assembly 3. The basic frame assembly 3 is fixed on the side wall plate of the wind tunnel test section, the magnetic levitation guide rail support assembly 2 is installed on the basic frame assembly 3, and the magnetic levitation bearing support assembly 1 is connected to the magnetic levitation guide rail support assembly 2; The magnetic bearing support assembly 1 includes a model mounting adapter 11, a rotating shaft 12, a first radial magnetic bearing 14, an axial magnetic bearing 16, a second radial magnetic bearing 17 and a movable mounting seat 19. The movable mounting seat 19 is connected to the magnetic guide rail support assembly 2. The rotating shaft 12 is arranged in the movable mounting seat 19. The first radial magnetic bearing 14, the axial magnetic bearing 16 and the second radial magnetic bearing 17 are sequentially installed on the rotating shaft 12. The model mounting adapter 11 is arranged at the end of the rotating shaft 12.

[0023] The model installation adapter 11 is used to install the model. The magnetic suspension bearing support component 1 is mainly connected to the magnetic suspension guide rail support component 2 through the mobile mounting seat 19. The mobile mounting seat 19 is provided with connecting ears on both sides. The connecting ears 19 on both sides are respectively connected to the levitator 21 through the levitator adapter 20. The levitator 21 is installed on the magnetic suspension guide rail 22. There are two magnetic suspension guide rails 22, which are symmetrically installed on the guide rail mounting plate 30 of the basic frame component 3. The upper and lower ends of each magnetic suspension guide rail 22 are respectively provided with dampers 23, and the dampers 23 are spring dampers or hydraulic dampers or gas pressure dampers. Under the action of the damper 23, the mobile mounting seat 19 can avoid the impact on the model caused by excessive acceleration when moving to the end of the magnetic suspension guide rail 22, thereby effectively protecting the model.

[0024] The basic frame assembly 3 includes a guide rail mounting plate 30, a longitudinal return steel 31, a transverse return steel 32 and an end plate 33. The front of the guide rail mounting plate 30 is used to connect the magnetic levitation guide rail 22, and the back of the guide rail mounting plate 30 is installed with the longitudinal return steel 31 and the transverse return steel 32. The two longitudinal return steels 31 and the two transverse return steels 32 form a rectangular frame fixed to the back of the guide rail mounting plate 30, and the end plate 33 is installed on the upper end surface of the upper transverse return steel 32, and the end plate 33 is installed on the lower end surface of the lower transverse return steel 32. The rectangular frame formed by the two longitudinal return steels 31 and the two transverse return steels 32 is installed on the side wall plate of the wind tunnel test section.

[0025] A front bearing cover 13 is installed at the front end of the movable mounting seat 19, and a rear bearing cover 18 is installed at the rear end thereof. The front bearing cover 13 is used to ensure the position of the first radial magnetic bearing 14, and the rear bearing cover 18 is used to ensure the position of the second radial magnetic bearing 17. A sleeve 15 is also arranged between the axial magnetic bearing 16 and the first radial magnetic bearing 14 and the second radial magnetic bearing 17 on both sides to ensure the relative position between the first radial magnetic bearing 14, the axial magnetic bearing 16 and the second radial magnetic bearing 17.

[0026] The rotating shaft 12 of the magnetic bearing support assembly 1 cooperates with the radial magnetic bearing rotor 142 of the first radial magnetic bearing 14 and the second radial magnetic bearing 17, the rotating shaft 12 cooperates with the axial magnetic bearing rotor 163 of the axial magnetic bearing 16, the movable mounting seat 19 cooperates with the radial magnetic bearing stator 141 of the first radial magnetic bearing 14 and the second radial magnetic bearing 17, the movable mounting seat 19 cooperates with the first axial magnetic bearing stator 161 and the second axial magnetic bearing stator 162 of the axial magnetic bearing 16, a radial magnetic bearing coil 143 is connected between the radial magnetic bearing rotor 142 and the radial magnetic bearing stator 141, a first axial magnetic bearing coil 164 is connected between the first axial magnetic bearing stator 161 and the axial magnetic bearing rotor 163, and a second axial magnetic bearing coil 165 is connected between the second axial magnetic bearing stator 162 and the axial magnetic bearing rotor 163; Magnetic bearings achieve suspension by adjusting the current to control the size of the magnetic force. Specifically, the sensor in the magnetic bearing detects the displacement of the rotor and the reference point. The reference point is the center of rotation. The displacement signal is converted into a control current through the controller and power amplifier. The control current causes the actuator to generate a corresponding magnetic field, thereby changing the rotor's suspension position, and ultimately maintaining the rotor at the set position under the action of the magnetic field formed.

[0027] Embodiment 2, combined Figure 1-Figure 6 This embodiment is described. This embodiment is a braking process of a free sinking / pitch support system based on magnetic suspension technology. In order to prevent the pitch angle of the model from being too large, thereby generating an excessive static load, the axial magnetic suspension bearing 16 is applied to braking and used as a brake. The specific working process is: in normal working state, the first axial magnetic suspension bearing coil 164 and the second axial magnetic suspension bearing coil 165 of the axial magnetic suspension bearing 16 jointly control the axial magnetic suspension bearing rotor 163 to suspend in the center. When a braking signal is given, the current output of one side of the stator coil is the maximum value, for example, the current output of the first axial magnetic suspension bearing coil 164 is the maximum value, and the magnetic suspension bearing rotor 163 is sucked to one side of the first axial magnetic suspension bearing stator 161 to achieve brake braking, and the generated braking force ultimately plays a role in protecting the model.

[0028] Magnetic levitation utilizes magnetic field force to make moving machinery stably suspended in space. It uses magnetic field as a medium, and can generate force without physical contact between the magnet and the suspended target. This non-contact support method can effectively solve the problems of wear, vibration, heat and friction energy consumption caused by friction generated by mechanical contact, thereby greatly reducing the motion damping in the sinking / pitch direction in the free sinking / pitch support system, and providing effective technical support for fully releasing the sinking and pitching degrees of freedom of the model. The free sinking / pitch support system based on magnetic levitation technology of the present invention lays a solid foundation for reproducing the body freedom flutter phenomenon in the wind tunnel and studying and solving the body freedom flutter problem.

[0029] This embodiment is only an exemplary description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto. As long as they do not exceed the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A free-floating / pitch support system based on magnetic levitation technology, characterized in that: The invention comprises a magnetic suspension bearing support assembly (1), a magnetic suspension guide rail support assembly (2), a basic frame assembly (3) and a model installation adapter (11), wherein the basic frame assembly (3) is fixed on a side wall plate of a wind tunnel test section, the magnetic suspension guide rail support assembly (2) is installed on the basic frame assembly (3), the magnetic suspension bearing support assembly (1) is connected to the magnetic suspension guide rail support assembly (2), and the model installation adapter (11) is installed on the magnetic suspension bearing support assembly (1).

2. According to claim 1, a free sinking / pitching support system based on magnetic levitation technology is characterized in that: The magnetic suspension bearing support assembly (1) comprises a rotating shaft (12), a first radial magnetic suspension bearing (14), an axial magnetic suspension bearing (16), a second radial magnetic suspension bearing (17) and a movable mounting seat (19); the movable mounting seat (19) is connected to the magnetic suspension guide rail support assembly (2); the rotating shaft (12) is arranged in the movable mounting seat (19); the first radial magnetic suspension bearing (14), the axial magnetic suspension bearing (16) and the second radial magnetic suspension bearing (17) are sequentially mounted on the rotating shaft (12); and the model mounting adapter (11) is mounted at the end of the rotating shaft (12).

3. According to claim 2, a free sinking / pitching support system based on magnetic levitation technology is characterized in that: A front bearing cover (13) is installed at the front end of the movable mounting seat (19), and a rear bearing cover (18) is installed at the rear end of the movable mounting seat (19); a first radial magnetic suspension bearing (14), an axial magnetic suspension bearing (16), and a second radial magnetic suspension bearing (17) are sequentially arranged between the front bearing cover (13) and the rear bearing cover (18); and sleeves (15) are respectively arranged between the axial magnetic suspension bearing (16) and the first radial magnetic suspension bearing (14) and the second radial magnetic suspension bearing (17).

4. The free sinking / pitching support system based on magnetic levitation technology according to claim 3 is characterized in that: The first radial magnetic suspension bearing (14) and the second radial magnetic suspension bearing (17) have the same structure, and both comprise a radial magnetic suspension bearing stator (141), a radial magnetic suspension bearing rotor (142) and a radial magnetic suspension bearing coil (143); a radial magnetic suspension bearing coil (143) is arranged between the radial magnetic suspension bearing stator (141) and the radial magnetic suspension bearing rotor (142); the radial magnetic suspension bearing stator (141) is cooperatively connected to the movable mounting seat (19); and the radial magnetic suspension bearing rotor (142) is cooperatively connected to the rotating shaft (12).

5. The free sinking / pitching support system based on magnetic levitation technology according to claim 4 is characterized in that: The axial magnetic suspension bearing (16) comprises a first axial magnetic suspension bearing stator (161), a second axial magnetic suspension bearing stator (162), an axial magnetic suspension bearing rotor (163), a first axial magnetic suspension bearing coil (164) and a second axial magnetic suspension bearing coil (165); the first axial magnetic suspension bearing stator (161) and the second axial magnetic suspension bearing stator (162) are respectively connected to the outside of the axial magnetic suspension bearing rotor (163); the first axial magnetic suspension bearing coil (164) is arranged between the first axial magnetic suspension bearing stator (161) and the axial magnetic suspension bearing rotor (163); the second axial magnetic suspension bearing coil (165) is arranged between the second axial magnetic suspension bearing stator (162) and the axial magnetic suspension bearing rotor (163); the first axial magnetic suspension bearing stator (161) and the second axial magnetic suspension bearing stator (162) are connected to the movable mounting seat (19); and the axial magnetic suspension bearing rotor (163) is connected to the rotating shaft (12).

6. A free sinking / pitching support system based on magnetic levitation technology according to claim 1 or 5, characterized in that: The basic frame assembly (3) comprises a guide rail mounting plate (30), a longitudinal return steel (31), a transverse return steel (32) and an end plate (33); two longitudinal return steels (31) and two transverse return steels (32) form a rectangular frame and are mounted on the back of the guide rail mounting plate (30); the end surface of the transverse return steel (32) is mounted with the end plate (33); and the magnetic suspension guide rail support assembly (2) is mounted on the front of the guide rail mounting plate (30).

7. The free-floating / pitching support system based on magnetic levitation technology according to claim 6, characterized in that: The magnetic suspension guide rail support assembly (2) comprises a levitator adapter (20), a levitator (21), a magnetic suspension guide rail (22) and a damper (23); two magnetic suspension guide rails (22) are symmetrically mounted on a guide rail mounting plate (30); dampers (23) are respectively mounted at the upper and lower ends of each magnetic suspension guide rail (22); a levitator (21) is respectively mounted on each magnetic suspension guide rail (22); and a movable mounting seat (19) is connected to the levitator (21) via the levitator adapter (20).

8. The free sinking / pitching support system based on magnetic levitation technology according to claim 7 is characterized in that: The first radial magnetic suspension bearing (14), the axial magnetic suspension bearing (16) and the second radial magnetic suspension bearing (17) are electromagnetic suspension bearings or hybrid magnetic suspension bearings.

9. The free sinking / pitching support system based on magnetic levitation technology according to claim 7, characterized in that: The damper (23) is a spring damper, a hydraulic damper, or a gas pressure damper.

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