A free floating / pitching support system based on magnetic levitation technology

Abstract

A free floating / pitching support system based on magnetic levitation technology belongs to the technical field of wind tunnel testing. The present invention solves the problem that in the current floating / pitching support system in a wind tunnel, when the incoming flow Mach number is relatively high, the support components will get stuck or even jam due to excessive motion damping. The present invention includes a magnetic levitation bearing support assembly, a magnetic levitation guide rail support assembly, and a basic frame assembly. The basic frame assembly is fixed on the side wall plate of the wind tunnel test section. The magnetic levitation guide rail support assembly is installed on the basic frame assembly, and the magnetic levitation bearing support assembly is connected to the magnetic levitation guide rail support assembly. The free floating / pitching support system based on magnetic levitation technology of the present invention can effectively solve the problems of wear, vibration, heat generation, and frictional energy consumption caused by friction generated by mechanical contact through this non-contact support method of magnetic levitation.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind tunnel tests, and particularly relates to a free heave / pitch support system based on magnetic levitation technology. Background Art

[0002] Some aircraft with special layouts may experience flutter states different from classical bending-torsion flutter under certain flight conditions. The coupling of its rigid body degrees of freedom and elastic degrees of freedom will generate unique body degree-of-freedom flutter problems. To reproduce and solve this phenomenon in a wind tunnel, a support system capable of releasing the heave and pitch degrees of freedom of the model must be available first.

[0003] In the domestic and foreign related research heave / pitch support systems, when the incoming flow Mach number is relatively high, the components of the support system will experience problems such as jamming or even complete seizure due to excessive motion damping and cannot move normally.

[0004] Therefore, this application proposes a free heave / pitch support system based on magnetic levitation technology. Summary of the Invention

[0005] The research and development purpose of the present invention is to solve the problem that in the current heave / pitch support system in a wind tunnel, when the incoming flow Mach number is relatively high, the support components will experience jamming or even seizure 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:

[0007] A free heave / pitch support system based on magnetic levitation technology, comprising a magnetic levitation bearing support assembly, a magnetic levitation guide rail support assembly, a basic frame assembly, and a model mounting adapter. The basic frame assembly is fixed on the side wall plate of the 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. The model mounting adapter is installed on the magnetic levitation bearing support assembly.

[0008] Further, the magnetic levitation bearing support assembly includes a rotating shaft, a first radial magnetic levitation bearing, an axial magnetic levitation bearing, a second radial magnetic levitation bearing, and a movable mounting seat. The movable mounting seat is connected to the magnetic levitation guide rail support assembly. The rotating shaft is arranged in the movable mounting seat. The first radial magnetic levitation bearing, the axial magnetic levitation bearing, and the second radial magnetic levitation bearing are sequentially installed on the rotating shaft. The model mounting adapter is installed at the end of the rotating shaft.

[0009] Further, a front bearing gland is installed at the front end of the movable mounting base, and a rear bearing gland is installed at the rear end of the movable mounting base. A first radial magnetic suspension bearing, an axial magnetic suspension bearing, and a second radial magnetic suspension bearing are sequentially arranged between the front bearing gland and the rear bearing gland. Sleeves are respectively arranged between the axial magnetic suspension bearing and the first radial magnetic suspension bearing and the second radial magnetic suspension bearing.

[0010] Further, the first radial magnetic suspension bearing and the second radial magnetic suspension bearing have the same structure, and both include a radial magnetic suspension bearing stator, a radial magnetic suspension bearing rotor, and a radial magnetic suspension bearing coil. A radial magnetic suspension bearing coil is arranged between the radial magnetic suspension bearing stator and the radial magnetic suspension bearing rotor. The radial magnetic suspension bearing stator is connected to the movable mounting base in a matching manner, and the radial magnetic suspension bearing rotor is connected to the rotating shaft in a matching manner.

[0011] Further, the axial magnetic suspension bearing includes a first axial magnetic suspension bearing stator, a second axial magnetic suspension bearing stator, an axial magnetic suspension bearing rotor, a first axial magnetic suspension bearing coil, and a second axial magnetic suspension bearing coil. The first axial magnetic suspension bearing stator and the second axial magnetic suspension bearing stator are respectively connected to the outside of the axial magnetic suspension bearing rotor in a matching manner. A first axial magnetic suspension bearing coil is arranged between the first axial magnetic suspension bearing stator and the axial magnetic suspension bearing rotor, and a second axial magnetic suspension bearing coil is arranged between the second axial magnetic suspension bearing stator and the axial magnetic suspension bearing rotor. The first axial magnetic suspension bearing stator, the second axial magnetic suspension bearing stator are connected to the movable mounting base in a matching manner, and the axial magnetic suspension bearing rotor is connected to the rotating shaft in a matching manner.

[0012] Further, the basic frame assembly includes a guide rail mounting plate, longitudinal return steel, transverse return steel, and end plates. 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. End plates are installed on the end faces of the transverse return steels, and the magnetic suspension guide rail support assembly is installed on the front of the guide rail mounting plate.

[0013] Further, the magnetic suspension guide rail support assembly includes a suspension adapter, a suspension, a magnetic suspension guide rail, and a damper. Two magnetic suspension guide rails are symmetrically installed on the guide rail mounting plate. Dampers are respectively installed at the upper and lower ends of each magnetic suspension guide rail. Suspensions are respectively installed on each magnetic suspension guide rail. The movable mounting base is connected to the suspension through the suspension adapter.

[0014] Further, the first radial magnetic suspension bearing, the axial magnetic suspension bearing, and the second radial magnetic suspension bearing are electromagnetic suspension bearings or hybrid magnetic suspension bearings.

[0015] Further, the damper is a spring damper or a hydraulic damper or a pneumatic damper.

[0016] The present invention has the following beneficial effects:

[0017] 1. In a free floating / pitching support system based on magnetic levitation technology of the present invention, magnetic levitation uses a magnetic field to stably levitate mechanical motion in space. Taking the magnetic field as a medium, a force can be generated between the magnet and the levitation target without physical contact. This non-contact support method can effectively solve problems such as wear, vibration, heat generation, and frictional energy consumption caused by mechanical contact.

[0018] 2. In a free floating / pitching support system based on magnetic levitation technology of the present invention, the moving pair composed of the levitator of the magnetic levitation guide rail support assembly and the magnetic levitation guide rail, and the rotating pair composed of the rotating shaft of the magnetic levitation bearing support assembly and the radial magnetic levitation bearing all achieve relative motion between components under non-contact conditions. The support system adopts magnetic levitation technology, which greatly reduces the motion damping during the movement of the moving mounting seat along the floating and sinking direction and during the rotation of the rotating shaft along the pitching direction.

[0019] 3. A free floating / pitching support system based on magnetic levitation technology of the present invention lays a solid foundation for reproducing the flutter phenomenon of the degrees of freedom of the body in the wind tunnel and researching and solving the problem of flutter of the degrees of freedom of the body. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a free floating / pitching support system based on magnetic levitation technology;

[0021] Figure 2 is an exploded view of a free floating / pitching support system based on magnetic levitation technology;

[0022] Figure 3 is a cross-sectional view of the magnetic levitation bearing support assembly;

[0023] Figure 4 is a schematic diagram of the first radial magnetic levitation bearing;

[0024] Figure 5 is a solid diagram of the axial magnetic levitation bearing;

[0025] Figure 6 is a cross-sectional view of the axial magnetic levitation bearing.

[0026] In the figure: 1 - Magnetic levitation bearing support assembly, 2 - Magnetic levitation guide rail support assembly, 3 - Foundation frame assembly, 11 - Model installation adapter, 12 - Rotating shaft, 13 - Front bearing gland, 14 - First radial magnetic levitation bearing, 15 - Sleeve, 16 - Axial magnetic levitation bearing, 17 - Second radial magnetic levitation bearing, 18 - Rear bearing gland, 19 - Moving mounting seat, 20 - Levitator adapter, 21 - Levitator, 22 - Magnetic levitation guide rail, 23 - Damper, 30 - Guide rail mounting plate, 31 - Longitudinal return steel, 32 - Transverse return steel, 33 - End plate, 141 - Radial magnetic levitation bearing stator, 142 - Radial magnetic levitation bearing rotor, 143 - Radial magnetic levitation bearing coil, 161 - First axial magnetic levitation bearing stator, 162 - Second axial magnetic levitation bearing stator, 163 - Axial magnetic levitation bearing rotor, 164 - First axial magnetic levitation bearing coil, 165 - Second axial magnetic levitation bearing coil. Detailed implementation mode

[0027] 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 merely 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.

[0028] 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, riveting 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.

[0029] Example 1, in combination with Figures 1-6 To illustrate this embodiment, a free floating / pitching support system based on magnetic levitation technology in this embodiment includes a magnetic levitation bearing support assembly 1, a magnetic levitation guide rail support assembly 2 and a foundation frame assembly 3. The foundation 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 foundation frame assembly 3, and the magnetic levitation bearing support assembly 1 is connected to the magnetic levitation guide rail support assembly 2;

[0030] The magnetic levitation bearing support assembly 1 includes a model installation adapter 11, a rotating shaft 12, a first radial magnetic levitation bearing 14, an axial magnetic levitation bearing 16, a second radial magnetic levitation bearing 17, and a movable mounting base 19. The movable mounting base 19 is connected to the magnetic levitation guide rail support assembly 2. The rotating shaft 12 is arranged inside the movable mounting base 19. The first radial magnetic levitation bearing 14, the axial magnetic levitation bearing 16, and the second radial magnetic levitation bearing 17 are sequentially installed on the rotating shaft 12. The model installation adapter 11 is arranged at the end of the rotating shaft 12.

[0031] The model installation adapter 11 is used to install the model. The magnetic levitation bearing support assembly 1 is mainly connected to the magnetic levitation guide rail support assembly 2 through the movable mounting base 19. Connecting ears are arranged on both sides of the movable mounting base 19. The connecting ears 19 on both sides are respectively connected to the suspension device 21 through the suspension device adapter 20. The suspension device 21 is installed on the magnetic levitation guide rail 22. There are two magnetic levitation guide rails 22, which are symmetrically installed on the guide rail mounting plate 30 of the basic frame assembly 3. Spring dampers or hydraulic dampers or pneumatic dampers 23 are respectively arranged at the upper and lower ends of each magnetic levitation guide rail 22. Under the action of the damper 23, the movable mounting base 19 can avoid generating excessive acceleration when moving to the end of the magnetic levitation guide rail 22 and causing impact on the model, thereby effectively protecting the model.

[0032] The basic frame assembly 3 includes a guide rail mounting plate 30, longitudinal return-shaped steel 31, transverse return-shaped steel 32, and end plates 33. The front of the guide rail mounting plate 30 is used to connect the magnetic levitation guide rail 22. The longitudinal return-shaped steel 31 and the transverse return-shaped steel 32 are installed on the back of the guide rail mounting plate 30. The two longitudinal return-shaped steels 31 and the two transverse return-shaped steels 32 form a rectangular frame and are fixed on the back of the guide rail mounting plate 30. The end plate 33 is installed on the upper end surface of the upper transverse return-shaped steel 32, and the end plate 33 is installed on the lower end surface of the lower transverse return-shaped steel 32. The rectangular frame formed by the two longitudinal return-shaped steels 31 and the two transverse return-shaped steels 32 is installed on the side wall plate of the wind tunnel test section.

[0033] A front bearing gland 13 is installed at the front end of the movable mounting base 19, and a rear bearing gland 18 is installed at the rear end thereof. The front bearing gland 13 is used to ensure the position of the first radial magnetic levitation bearing 14, and the rear bearing gland 18 is used to ensure the position of the second radial magnetic levitation bearing 17. A sleeve 15 is also arranged between the axial magnetic levitation bearing 16 and the first radial magnetic levitation bearing 14 and the second radial magnetic levitation bearing 17 on both sides to ensure the relative positions of the first radial magnetic levitation bearing 14, the axial magnetic levitation bearing 16, and the second radial magnetic levitation bearing 17.

[0034] The rotating shaft 12 of the magnetic levitation bearing support assembly 1 cooperates with the radial magnetic levitation bearing rotors 142 of the first radial magnetic levitation bearing 14 and the second radial magnetic levitation bearing 17. The rotating shaft 12 cooperates with the axial magnetic levitation bearing rotor 163 of the axial magnetic levitation bearing 16. The movable mounting seat 19 cooperates with the radial magnetic levitation bearing stators 141 of the first radial magnetic levitation bearing 14 and the second radial magnetic levitation bearing 17. The movable mounting seat 19 cooperates with the first axial magnetic levitation bearing stator 161 and the second axial magnetic levitation bearing stator 162 of the axial magnetic levitation bearing 16. A radial magnetic levitation bearing coil 143 is connected between the radial magnetic levitation bearing rotor 142 and the radial magnetic levitation bearing stator 141. A first axial magnetic levitation bearing coil 164 is connected between the first axial magnetic levitation bearing stator 161 and the axial magnetic levitation bearing rotor 163. A second axial magnetic levitation bearing coil 165 is connected between the second axial magnetic levitation bearing stator 162 and the axial magnetic levitation bearing rotor 163;

[0035] The magnetic levitation bearing realizes levitation by adjusting the magnitude of the magnetic force through controlling the current. Specifically, in the magnetic levitation bearing, the sensor detects the displacement between 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 the power amplifier. The control current enables the actuator to generate a corresponding magnetic field, thereby changing the levitation position of the rotor and finally enabling the rotor to always maintain at the set position under the action of the formed magnetic force field.

[0036] Example 2, combined with Figures 1-6 To illustrate this embodiment, this embodiment is about the braking process of a free floating / pitching support system based on magnetic levitation technology. To prevent the pitching angle of the model from being too large and thus generating too large a static load, the axial magnetic levitation bearing 16 is applied in braking and used as a brake. The specific working process is as follows: In the normal working state, the first axial magnetic levitation bearing coil 164 and the second axial magnetic levitation bearing coil 165 of the axial magnetic levitation bearing 16 jointly control the axial magnetic levitation bearing rotor 163 to be centered and levitated. When a braking signal is given, the current output of one side stator coil is the maximum value. For example, the current output of the first axial magnetic levitation bearing coil 164 is the maximum value, sucking the magnetic levitation bearing rotor 163 to one side of the first axial magnetic levitation bearing stator 161 to achieve braking with a brake, and the generated braking force ultimately plays a role in protecting the model.

[0037] Magnetic levitation uses magnetic force to stably levitate moving machinery in space. Taking the magnetic field as a medium, a force can be generated between the magnet and the levitation target without physical contact in the physical sense. This non-contact support method can effectively solve problems such as wear, vibration, heat generation, and frictional energy consumption caused by mechanical contact. Thus, it provides effective technical support for significantly reducing the motion damping in the heave / pitch directions in the free heave / pitch support system and fully releasing the heave and pitch degrees of freedom of the model, laying a solid foundation for reproducing the body-degree-of-freedom flutter phenomenon and studying and solving the body-degree-of-freedom flutter problem in the wind tunnel for the free heave / pitch support system based on magnetic levitation technology of the present invention.

[0038] 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 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 the side wall plate of the 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); 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); the model mounting adapter (11) is mounted at the end of the rotating shaft (12); 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 A 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); 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 an end plate (33); the magnetic suspension guide rail support assembly (2) is mounted on the front of the guide rail mounting plate (30); the magnetic suspension guide rail support assembly (2 ) comprises a suspension adapter (20), a suspension (21), a magnetic suspension rail (22) and a damper (23), wherein two magnetic suspension rails (22) are symmetrically mounted on a rail mounting plate (30), a damper (23) is mounted at the upper and lower ends of each magnetic suspension rail (22), a suspension (21) is mounted on each magnetic suspension rail (22), and a movable mounting seat (19) is connected to the suspension (21) via the suspension adapter (20).

2. According to claim 1, 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).

3. According to claim 2, a free sinking / pitching support system based on magnetic levitation technology 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).

4. According to claim 1, a free sinking / pitching support system based on magnetic levitation technology 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.

5. The free sinking / pitching support system based on magnetic levitation technology according to claim 4 is characterized in that: The damper (23) is a spring damper, a hydraulic damper or a gas pressure damper.

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