A device and method for testing eddy current damping coefficient between magnet and cylinder

Abstract

The present invention discloses a device and method for testing the eddy current damping coefficient between a magnet and a cylinder, which mainly includes a cylinder, a guide assembly installed at the end of the cylinder, a centering component, a magnetic component to be measured, and an S-type tension and pressure sensor. The centering component includes a hollow piston located in the cylinder and a hollow rod connected thereto, the other end of the hollow rod is connected to one end of the S-type tension and pressure sensor, the magnetic component to be measured is fixed on the hollow piston, and compressed gas is provided to the centering component and the guide assembly through an air supply component to form an air film between the hollow piston, the magnetic component to be measured and the cylinder, and between the hollow rod and the guide assembly, thereby ensuring that the magnetic component to be measured is coaxial with the cylinder during the test and improving the accuracy of the test results. The damping coefficient is obtained by measuring the tension and pressure exerted on the S-type tension and pressure sensor when the magnetic component to be measured moves at a uniform speed. The eddy current damping test device proposed by the present invention has good measurement accuracy and can ensure the accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the field of eddy current damping testing, and in particular to a device and method for testing the eddy current damping coefficient between a magnet and a cylinder. Background Art

[0002] Mechanical equipment is widely used in industrial production and daily life. However, its operation generates significant vibration and noise, which can affect its performance and service life, and in severe cases, lead to premature component failure. Mechanical vibration also occurs in structural engineering projects such as buildings, bridges, and railways, causing structural deformation and serious consequences. To mitigate these harmful vibrations, various dampers are used in structural engineering. Their principle is to dissipate the vibration energy in the system to achieve vibration reduction.

[0003] Compared to traditional liquid or gas dampers that rely on mechanical friction to dissipate energy and require working fluids, non-contact eddy current damping has more advantages and is therefore becoming increasingly widely used. Its working principle is to use a conductor to cut the magnetic flux lines, forming eddy currents in the conductor, thereby forming a reverse induced magnetic field and generating eddy current damping force, which hinders the movement of the original magnetic field. The traditional method for testing eddy current damping is to obtain it by indirect calculation. Specifically, the damping force is further calculated based on the position information obtained by the free fall motion using the laser displacement sensor. The damping force data obtained in this way is often not accurate enough. Summary of the Invention

[0004] To address the inaccurate data obtained in existing technologies, the present invention provides a device and method for measuring the eddy current damping coefficient between a magnet and a cylinder. This method employs direct measurement and utilizes the principle of a hydrostatic gas bearing to achieve coaxial alignment between the magnet and the cylinder, resulting in a more accurate measurement of the cylinder's eddy current damping.

[0005] The present invention is achieved through the following technical solutions:

[0006] A device for testing the eddy current damping coefficient between a magnet and a cylinder, characterized by comprising: a mounting platform, a moving part, a centering part, a guide assembly, a cylinder, a magnetic part to be tested, an air supply part, a control system, and an S-type tension and pressure sensor;

[0007] The moving parts include a first servo motor, a one-way ball screw slide, a first connecting platform, a second servo motor, a bidirectional ball screw slide, a second connecting platform, and a V-shaped block; the one-way ball screw slide is fixed on the mounting platform, the first servo motor is connected to the screw inside the one-way ball screw slide via a coupling, and the first connecting platform is mounted on the slide seat of the one-way ball screw slide; the bidirectional ball screw slide is fixed on the mounting platform and is perpendicular to the one-way ball screw slide, the second servo motor is connected to the screw inside the bidirectional ball screw slide through a coupling, the two second connecting platforms are respectively fixed on the two slide seats of the two-way ball screw slide, and the two V-shaped blocks are respectively fixed on the two second connecting platforms, and the openings are opposite to each other; the cylinder is clamped and fixed on the second connecting platform by the V-shaped block;

[0008] The guide assembly is installed at the end of the cylinder, including an air bearing, an air bearing air inlet, a guide sleeve, and a rubber ring. The air bearing is installed inside the guide sleeve, and the other side of the guide sleeve is interference-fitted with the inner wall of the cylinder through the rubber ring.

[0009] The centering component includes a hollow rod and a hollow piston. The hollow piston is located in the cylinder and has a plurality of throttle holes on its wall. One end of the hollow rod passes through an air bearing and is threadedly connected to the hollow piston located in the cylinder. The other end is connected to one end of an S-type tension and pressure sensor. The hollow rod has an air inlet connected to a through hole in the hollow rod. The other end of the S-type tension and pressure sensor is fixed to the first connecting platform.

[0010] The magnetic component to be measured includes a magnetic component and a magnetic clamping mechanism, the magnetic component is fixedly clamped on the magnetic clamping mechanism, and the magnetic component to be measured is connected to the hollow piston bolt;

[0011] The air supply component is connected to the air inlet and the air bearing air inlet, and the opening and closing of the air circuit is controlled by a normally closed high-speed switching valve;

[0012] The control system includes a PC, a data acquisition card, and a PWM signal generator. The PC is connected to the S-type tension and pressure sensor, the first servo motor, and the second servo motor through the data acquisition card, and is connected to the normally closed high-speed switch valve through the PWM signal generator.

[0013] In the above scheme, the magnet clamping mechanism includes a rotating disk, a support block, a fixed disk, an elastic ring, a retaining spring, a bearing, a sliding plate, and a rubber mold. The three sliding plates are respectively placed in the three grooves of the fixed disk, and the rotating disk is installed on the protruding shaft of the fixed disk through a bearing. The sliding shafts of the three sliding plates are placed in the three grooves of the rotating disk and are respectively clamped by retaining springs. The three rubber molds are respectively installed on the baffles of the three sliding plates. The three sliding plates are also provided with grooves, and the elastic rings are placed in the grooves. The hexagon socket bolts pass through the countersunk holes on the three support blocks to fix the magnet clamping mechanism to the hollow piston at the end of the centering component.

[0014] In the above scheme, the gas supply components include an air source, a separator, a pressure reducing valve, a gas tank, a pressure sensor, a normally closed high-speed switching valve, and a filter. The air source is transported to the gas tank through the separator and the pressure reducing valve. The pressure sensor is used to measure the air pressure at the gas tank outlet. The normally closed high-speed switching valve is placed at the rear end of the gas tank. The gas passes through the filter and is connected to the air inlet and the air bearing inlet. The pressure sensor is connected to the PC through a data acquisition card.

[0015] In the above solution, the S-shaped tension and pressure sensor is connected to the hollow rod through a ball hinge.

[0016] In the above solution, each side of the second connecting platform is provided with a stopper, and a buffer spring is installed between each stopper and the rear end of the V-shaped block, and the V-shaped block is made of non-metallic material.

[0017] In the above solution, the V-shaped block is made of non-metallic material.

[0018] In the above solution, the inner wall of the cavity in the hollow piston is provided with multiple throttling holes, which are distributed in at least two rows in the axial direction and at least three in the circumferential direction; the hollow rod is threadedly connected to the hollow piston and is sealed by a sealing ring to prevent gas leakage.

[0019] In the above solution, the magnetic component is a permanent magnet or an electromagnetic device.

[0020] In the above solution, the installation platform is placed horizontally or vertically.

[0021] In the above solution, the testing method of the device is characterized by comprising the following steps:

[0022] (1) The control system first controls the second servo motor to drive the internal screw of the bidirectional ball screw slide to work, so that the two V-shaped blocks approach and clamp the cylinder;

[0023] (2) The control system controls the normally closed high-speed switch valve to open through the PWM signal generator, and supplies compressed air to the air inlet and the air bearing inlet, thereby generating a high-pressure bearing air film between the inner wall of the cylinder and the outer wall of the hollow piston, and between the air bearing and the hollow rod, so that the hollow piston and the cylinder are coaxial. Then the control system controls the first servo motor to drive the first connecting platform to perform reciprocating motion, thereby realizing the uniform linear motion of the measured magnetic component inside the cylinder; in this process, the control system collects the tension or pressure measured by the S-type tension and pressure sensor during uniform motion in real time, which is the damping force, and calculates the damping coefficient based on the relationship between the damping force and the speed of uniform motion.

[0024] In the above test method, when the mounting platform is placed horizontally, the force measured on the S-type tension and pressure sensor is the eddy current damping force; when the mounting platform is installed vertically, the eddy current damping force is the force measured on the S-type tension and pressure sensor minus the gravity of the centering component and the magnetic component being measured.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] First, the device and method provided by the present invention for testing the eddy current damping coefficient between a magnet and a cylinder barrel relies on providing compressed air of sufficient pressure to the hollow piston and air bearing to generate a load-bearing capacity capable of supporting the centering assembly, thereby ensuring that the magnet module and the cylinder barrel are coaxial during the test and improving the accuracy of the test results.

[0027] Secondly, the device uses a force sensor to directly measure the eddy current damping, which is more accurate than the traditional method of indirectly calculating the damping by measuring position information through free fall and laser displacement sensors.

[0028] Thirdly, the device and method for testing the eddy current damping coefficient between a magnet and a cylinder provided by the present invention have an installation platform that can be placed horizontally or vertically, and can be applied to a variety of testing scenarios;

[0029] Finally, the device and method for testing the eddy current damping coefficient between a magnet and a cylinder described in the present invention can replace cylinders and magnet modules with different size parameters for testing, so the application range is very wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a front view of a device used to test the eddy current damping coefficient between a magnet and a cylinder.

[0031] Figure 2 It is an overall schematic diagram of a device for testing the eddy current damping coefficient between a magnet and a cylinder.

[0032] Figure 3 This is a partial front view of the second connecting platform.

[0033] Figure 4 It is a partial cross-sectional view of the centering component and guide component.

[0034] Figure 5 This is a partial main view of the guide component.

[0035] Figure 6 It is a partial front view of the magnetic component being measured.

[0036] Figure 7 It is a partial cross-sectional view of the magnet component and the centering assembly being measured.

[0037] Figure 8 This is a schematic diagram of the control system of a device used to test the eddy current damping coefficient between a magnet and a cylinder.

[0038] In the figure: 1. Mounting platform, 2. Moving parts, 201. First servo motor, 202. One-way ball screw slide, 203. First connecting platform, 204. Second servo motor, 205. Two-way ball screw slide, 206. Second connecting platform, 206-1. Stop block, 206-2. Spring, 207. V-shaped block, 3. Centering component, 301. Hollow rod, 301-1. Air inlet, 302. Hollow piston, 302-1. Throttle hole, 4. Guide assembly, 401. Air bearing, 401-1. Air bearing air inlet, 402. Guide sleeve, 403. Rubber ring; 5. Cylinder; 6. Measured magnetic component; 601. Magnetic component; 602. Magnet clamping mechanism; 602-1. Rotating disk; 602-2. Support block; 602-3. Fixed disk; 602-4. Elastic ring; 602-5. Circlip; 602-6. Bearing; 602-7. Sliding piece; 602-8. Rubber mold; 7. Air supply component; 701. Air source; 702. Separator; 703. Pressure reducing valve; 704. Air tank; 705. Pressure sensor; 706. Normally closed high-speed switching valve; 707. Filter; 8. Control system; 801. PC; 802. Data acquisition card; 803. PWM signal generator; 804. S-type tension and pressure sensor. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the specific embodiments of the drawings, but the protection scope of the present invention is not limited thereto.

[0040] Figure 1 and Figure 2 The figure shows an embodiment of a device for testing the eddy current damping coefficient between a magnet and a cylinder according to the present invention, characterized in that it includes a mounting platform 1, a moving part 2, a centering part 3, a guide assembly 4, a cylinder 5, a magnetic part to be measured 6, an air supply part 7, a control system 8 and an S-shaped tension and pressure sensor 804. The moving part 2 includes a first servo motor 201, a one-way ball screw slide 202, a first connecting platform 203, a second servo motor 204, a two-way ball screw slide 205, a second connecting platform 206 and a V-shaped block 207. Figure 2As shown, the one-way ball screw slide 202 is fixed to the mounting platform 1, the first servo motor 201 is connected to the screw inside the one-way ball screw slide 202 via a coupling, and the first connecting platform 203 is mounted on the slide seat of the one-way ball screw slide 202. The bidirectional ball screw slide 205 is fixed to the mounting platform 1 and is perpendicular to the one-way ball screw slide 202. The second servo motor 204 is connected to the screw inside the bidirectional ball screw slide 205 via a coupling. The two second connecting platforms 206 are respectively fixed to the two slide seats of the bidirectional ball screw slide 205. Two V-shaped blocks 207 are respectively fixed to the two second connecting platforms 206. The cylinder 5 is clamped and fixed to the second connecting platforms 206 via the V-shaped blocks 207, with the openings facing each other.

[0041] The second connecting platform 206 is also provided with a stopper 206-1 on each side, and a buffer spring 206-2 is installed between the stopper 206-1 and the rear end of the V-shaped block 207. Figure 3 The two buffer springs 206 - 2 have the same and relatively large stiffness. Due to the relatively large stiffness of the buffer springs 206 - 2 , their deformation is relatively small, thereby ensuring that after the cylinder barrel 5 is clamped, the bidirectional ball screw slide 205 moves within a small displacement without damaging the internal screw nut structure of the bidirectional ball screw slide 205 .

[0042] When the second servo motor 204 drives the bidirectional ball screw slide 205 to work, the two V-shaped blocks 207 approach each other at the same time, thereby clamping the cylinder 5, and the buffer spring 206-2 plays a buffering role. The two V-shaped blocks 207 here are made of non-metallic materials, which can avoid the eddy current effect on the V-shaped blocks 207 when the measured magnetic component 6 moves relative to the cylinder 5, thereby affecting the test results. During the movement, even if the cylinder 5 has a slight displacement change in the horizontal direction, it can be overcome by the spherical hinge between the centering component 3 and the S-type tension and pressure sensor 804.

[0043] The guide assembly 4 is mounted on the end of the cylinder 5. Figure 5 As shown, it includes an air bearing 401, an air bearing air inlet 401-1, a guide sleeve 402, and a rubber ring 403; the air bearing 401 is installed inside the guide sleeve 402, and the other side of the guide sleeve 402 is interference fit with the inner wall of the cylinder 5 through the rubber ring 403. The rubber ring 403 facilitates the disassembly and assembly of the guide component 4. At the same time, the air bearing 401 also provides support for the centering component 3.

[0044] like Figure 4As shown, the centering component 3 includes a hollow rod 301 and a hollow piston 302. The hollow piston 302 is located in the cylinder 5 and has multiple throttle holes 302-1 on the wall. The throttle holes 302-1 are distributed in at least two rows in the axial direction and at least three in the circumferential direction. The multiple throttle holes 302-1 are evenly distributed to facilitate the compressed gas to generate a high-pressure bearing air film between the inner wall of the cylinder 5 and the outer wall of the hollow piston 302, and between the air bearing 401 and the guide sleeve 402, so that the hollow piston 302 is coaxial with the cylinder 5. The high-pressure bearing air film generated between the air bearing 401 and the guide sleeve 402 acts on the hollow rod 301 and the S-type tension and pressure sensor 804, and the ball hinge is used to promote the more accurate coaxial position of the hollow rod 301 and the S-type tension and pressure sensor 804. One end of the hollow rod 301 passes through the air bearing 401 and is threadedly connected to the hollow piston 302, and the other end is connected to one end of the S-type tension and pressure sensor 804. An air inlet 301-1 is opened on the hollow rod 301 and is connected to the through hole in the hollow rod 301. The other end of the S-type tension and pressure sensor 804 is fixed on the first connecting platform 203.

[0045] The magnetic component 6 to be measured includes a magnetic component 601 and a magnetic clamping mechanism 602. The magnetic component 601 is fixedly clamped on the magnetic clamping mechanism 602. The magnetic component 6 to be measured is bolted to the hollow piston 302. Figure 6 As shown, the magnetic component 6 to be measured has no direct contact with the inner wall of the cylinder 5. The three sliding pieces 602-7 are respectively placed in the three grooves of the fixed disk 602-3. The rotating disk 602-1 is mounted on the extended shaft of the fixed disk 602-3 via the bearing 602-6. The sliding shafts of the three sliding pieces 602-7 are placed in the three grooves of the rotating disk 602-1 and are respectively clamped by the retaining spring 602-5. The three rubber molds 602-8 are respectively mounted on the blocking pieces of the three sliding pieces 602-7. The three sliding pieces 602-7 are also provided with grooves, and the elastic ring 602-4 is placed in the grooves. Figure 7 As shown, the hexagon socket bolts pass through the countersunk holes on the three support blocks 602 - 2 to securely connect the magnet clamping mechanism 602 to the hollow piston 302 at the end of the centering assembly 3 .

[0046] When the magnet clamping mechanism 602 is in a natural state, the three sliding pieces 602-7 are in a contracted state due to the action of the elastic ring 602-4. When the magnetic component 601 is placed, the elastic force of the elastic ring 602-4 is overcome to cause the three sliding pieces 602-7 to open and wrap the magnetic component 601. The rubber mold 602-8 is used to prevent the magnetic component 601 from rotating relative to each other. The magnet clamping mechanism 602 can clamp magnetic components 601 of different outer diameters for testing, so it has a very wide range of applications.

[0047] The gas supply component 7 includes a gas source 701, a separator 702, a pressure reducing valve 703, a gas tank 704, a pressure sensor 705, a normally closed high-speed switching valve 706, and a filter 707. Figure 8 As shown, the compressed air generated by the gas source 701 is transported to the gas tank 704 through the separator 702 and the pressure reducing valve 703. The pressure sensor 705 is placed at the rear end of the gas tank 704 to measure the air pressure at the gas outlet of the gas tank 704 and transmit the data to the control system 8. The normally closed high-speed switching valve 706 is placed at the rear end of the gas tank 704. The gas passes through the filter 707 to supply the air inlet 301-1 and the air bearing inlet 401-1, and the normally closed high-speed switching valve 706 controls the on-off of the gas circuit.

[0048] The control system 8 includes a PC 801, a data acquisition card 802, and a PWM signal generator 803. The data acquisition card 802 and the PWM signal generator 803 are both electrically connected to the PC 801. An S-shaped tension and pressure sensor 804 is connected to the hollow rod 301 via a ball hinge. Information from the S-shaped tension and pressure sensor 804 is transmitted to the PC 801 via the A / D port of the data acquisition card 802. The PC 801 controls the first servo motor 201 and the second servo motor 204 via the D / A port of the data acquisition card 802. The force measured on the S-shaped tension and pressure sensor 804 represents the magnitude of the eddy current damping.

[0049] During the test, the mounting platform 1 is placed horizontally. The PC 801 first controls the second servo motor 204 to drive the bidirectional ball screw slide 205 to move at an extremely low speed, so that the two V-shaped blocks 207 are close to each other, thereby clamping the cylinder 5. The PC 801 controls the normally closed high-speed switch valve 706 to open via the PWM signal generator 803, supplying compressed air to the air inlet 301-1 and the air bearing air inlet 401-1, thereby generating a high-pressure bearing air film between the inner wall of the cylinder 5 and the outer wall of the hollow piston 302, and between the air bearing 401 and the hollow rod 301. , so that the measured magnetic component 6 and the cylinder 5 are coaxial; at the same time, the PC 801 controls the first servo motor 201 to drive the first connecting platform 203 to perform reciprocating motion, thereby realizing the measured magnetic component 6 to perform uniform linear motion inside the cylinder 5; during the movement of the measured magnetic component 6, the force value measured in real time by the S-type tension and pressure sensor 804 is transmitted to the PC 801 via the A / D port of the data acquisition card 802. During the uniform motion, the force measured on the S-type tension and pressure sensor 804 is the size of the eddy current damping, and the average value is obtained by multiple measurements.

[0050] Unlike Example 1, the mounting platform 1 is positioned vertically. This requires reducing the pressure of the compressed air supplied to the air inlet 301-1 and the air bearing 401 to create a high-pressure air film on the inner wall of the cylinder 5 and the outer wall of the hollow rod 301, thereby achieving coaxial alignment between the magnetic component 6 under test and the cylinder 5. Similarly, the force measured by the S-type tension and pressure sensor 804 during the uniform motion of the magnetic component 6 under test is monitored in real time. During uniform motion, the force acting on the S-type tension and pressure sensor 804 is the combined force of the eddy current damping force and the weight of the centering component 3 and the magnetic component 6 under test. Subtracting these two weights yields the eddy current damping force.

[0051] Following the technical solution of Example 1, the magnetic component 601 is replaced by an electromagnet as the magnet to be measured, and an adjustable DC power supply is used to power the electromagnet. The magnetic field strength of the electromagnet can be changed by changing the current, and the eddy current damping force and damping coefficient under different magnetic field strengths can be obtained.

[0052] The examples described are embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention are within the scope of protection of the present invention.

Claims

1. A device for testing the eddy current damping coefficient between a magnet and a cylinder, characterized by: It includes a mounting platform (1), a moving part (2), a centering part (3), a guide assembly (4), a cylinder (5), a magnetic part to be measured (6), an air supply part (7), a control system (8), and an S-type tension and pressure sensor (804); The moving component (2) includes a first servo motor (201), a one-way ball screw slide (202), a first connecting platform (203), a second servo motor (204), a two-way ball screw slide (205), a second connecting platform (206), and a V-shaped block (207); the one-way ball screw slide (202) is fixed on the mounting platform (1), the first servo motor (201) is connected to the screw inside the one-way ball screw slide (202) via a coupling, and the first connecting platform (203) is installed on the slide seat of the one-way ball screw slide (202). On the mounting platform (1); the bidirectional ball screw slide (205) is fixed on the mounting platform (1) and is perpendicular to the unidirectional ball screw slide (202); the second servo motor (204) is connected to the screw inside the bidirectional ball screw slide (205) through a coupling; the two second connecting platforms (206) are respectively fixed on the two slide seats of the bidirectional ball screw slide (205); the two V-shaped blocks (207) are respectively fixed on the two second connecting platforms (206) and the openings are opposite to each other; the cylinder (5) is clamped and fixed on the second connecting platform (206) through the V-shaped block (207); The guide assembly (4) is installed at the end of the cylinder (5), and includes an air bearing (401), an air bearing air inlet (401-1), a guide sleeve (402), and a rubber ring (403). The air bearing (401) is installed inside the guide sleeve (402), and the other side of the guide sleeve (402) is interference-fitted with the inner wall of the cylinder (5) through the rubber ring (403); The centering component (3) includes a hollow rod (301) and a hollow piston (302), the hollow piston (302) is located in the cylinder (5) and has a plurality of throttle holes (302-1) on its wall; one end of the hollow rod (301) passes through the air bearing (401) and is threadedly connected to the hollow piston (302) located in the cylinder (5), and the other end is connected to one end of the S-type tension and pressure sensor (804), and the hollow rod (301) is provided with an air inlet (301-1) that is connected to a through hole in the hollow rod (301); the other end of the S-type tension and pressure sensor (804) is fixed to the first connecting platform (203); The measured magnetic component (6) comprises a magnetic component (601) and a magnetic clamping mechanism (602), the magnetic component (601) is fixedly clamped on the magnetic clamping mechanism (602), and the measured magnetic component (6) is bolted to the hollow piston (302); The air supply component (7) is in communication with the air inlet (301-1) and the air bearing air inlet (401-1), and the opening and closing of the air path is controlled by a normally closed high-speed switching valve (706); The control system (8) includes a PC (801), a data acquisition card (802), and a PWM signal generator (803). The PC (801) is connected to an S-type tension and pressure sensor (804), a first servo motor (201), and a second servo motor (204) via the data acquisition card (802), and is connected to a normally closed high-speed switch valve (706) via the PWM signal generator (803).

2. The device for testing the eddy current damping coefficient between a magnet and a cylinder according to claim 1, characterized in that: The magnet clamping mechanism (602) comprises a rotating disk (602-1), a supporting block (602-2), a fixed disk (602-3), an elastic ring (602-4), a retaining spring (602-5), a bearing (602-6), a sliding sheet (602-7), and a rubber mold (602-8). The three sliding sheets (602-7) are respectively placed in three slots of the fixed disk (602-3). The rotating disk (602-1) is mounted on the protruding shaft of the fixed disk (602-3) via the bearing (602-6). The three sliding sheets (602-7) are respectively placed in three slots of the fixed disk (602-3). The sliding shaft of the moving plate (602-7) is placed in three grooves of the rotating disk (602-1) and is clamped by the retaining springs (602-5) respectively. The three rubber molds (602-8) are respectively installed on the blocking plates of the three sliding plates (602-7). The three sliding plates (602-7) are also provided with grooves. The elastic rings (602-4) are placed in the grooves. The hexagon socket bolts pass through the countersunk holes on the three support blocks (602-2) to fix the magnet clamping mechanism (602) and the hollow piston (302) at the end of the centering component (3).

3. The device for testing the eddy current damping coefficient between a magnet and a cylinder according to claim 1, characterized in that: The gas supply component (7) comprises a gas source (701), a separator (702), a pressure reducing valve (703), a gas tank (704), a pressure sensor (705), a normally closed high-speed switching valve (706), and a filter (707). The gas source (701) is delivered to the gas tank (704) through the separator (702) and the pressure reducing valve (703). The pressure sensor (705) is used to measure the gas pressure at the gas outlet of the gas tank (704). The normally closed high-speed switching valve (706) is placed at the rear end of the gas tank (704). The gas passes through the filter (707) and is connected to the gas inlet (301-1) and the air bearing gas inlet (401-1). The pressure sensor (705) is connected to the PC (801) via a data acquisition card (802).

4. The device for testing the eddy current damping coefficient between a magnet and a cylinder according to claim 3, characterized in that: The S-shaped tension and pressure sensor (804) is connected to the hollow rod (301) via a spherical hinge.

5. The device for testing the eddy current damping coefficient between a magnet and a cylinder according to claim 1, characterized in that: A stopper (206-1) is provided on each side of the second connecting platform (206), and a buffer spring (206-2) is installed between each stopper (206-1) and the rear end of the V-shaped block (207). The V-shaped block (207) is made of a non-metallic material.

6. The device for testing the eddy current damping coefficient between a magnet and a cylinder according to claim 1, characterized in that: The throttle holes (302-1) on the wall surface of the hollow piston (302) are distributed in at least two rows in the axial direction and at least three in the circumferential direction; the hollow rod (301) is threadedly connected to the hollow piston (302) and sealed by a sealing ring (303) to prevent gas leakage.

7. The device for testing the eddy current damping coefficient between a magnet and a cylinder according to claim 1, characterized in that: The magnetic component (601) is a permanent magnet or an electromagnetic device.

8. The device for testing the eddy current damping coefficient between a magnet and a cylinder according to claim 1, characterized in that: The installation platform (1) is placed horizontally or vertically.

9. A testing method based on the device according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) The control system (8) first controls the second servo motor (204) to drive the internal screw of the bidirectional ball screw slide (205) to work, so that the two V-shaped blocks (207) are close to each other and the cylinder (5) is clamped; (2) The control system (8) controls the normally closed high-speed switch valve (706) to open via the PWM signal generator (803), and provides compressed air to the air inlet (301-1) and the air bearing air inlet (401-1), thereby generating a high-pressure bearing air film between the inner wall of the cylinder (5) and the outer wall of the hollow piston (302), and between the air bearing (401) and the hollow rod (301), so that the hollow piston (302) and the cylinder (5) are coaxial. Subsequently, the control system (8) controls the first servo motor (201) to drive the first connecting platform (203) to perform reciprocating motion, thereby achieving uniform linear motion of the measured magnetic component (6) inside the cylinder (5); during this process, the control system (8) collects the tension or pressure during uniform motion measured by the S-type tension and pressure sensor (804) in real time, which is the damping force, and calculates the damping coefficient based on the relationship between the damping force and the speed of the uniform motion.

10. The testing method according to claim 9, characterized in that: When the mounting platform (1) is placed horizontally, the force measured on the S-type tension and pressure sensor (804) is the eddy current damping force; when the mounting platform (1) is installed vertically, the eddy current damping force is the force measured on the S-type tension and pressure sensor (804) minus the gravity of the centering component (3) and the measured magnetic component (6).

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