Cylindrical surface gap shape intelligent regulation and control system and method based on active air bag driving

Abstract

The invention discloses a cylindrical surface gap shape intelligent regulation and control system and method based on active air bag driving. The system comprises a floating ring arranged on the periphery of a rotating shaft, an outer cavity formed in the periphery of the floating ring, a front end cover and a rear end cover, wherein the rotating shaft penetrates through the front end cover, and the front end cover and the rear end cover are connected with the floating ring and the two ends of the outer cavity in a sealed mode. A main gap fluid flowing channel is formed between the inner surface of the floating ring and the outer surface of the rotating shaft; air bag containing grooves are evenly distributed in the inner surface of the outer cavity in the circumferential direction, and a plurality of elastic air bags capable of being independently controlled are placed in the air bag containing grooves and make contact with the outer surface of the floating ring. The elastic air bag can control the local inflation volume of the elastic air bag through an external air path, and meanwhile the floating ring is pushed to move, so that the shape of the gap is adjusted. Different cylindrical surface gaps formed due to machining and assembling errors in engineering practice are simulated, the local air film rigidity damping characteristics of the system and the position of the floating ring are adjusted in time according to different vibration amplitudes and directions of the rotating shaft, and the gap state and the dynamic characteristics of the system can be accurately adjusted and controlled in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of non-contact cylindrical fluid sealing and gas lubrication, and specifically to a cylindrical gap shape intelligent control system and method based on active airbag drive, which is mainly used in shaft end and interstage seals and gas-lubricated bearings of large turbine machinery such as turbines and compressors. Background Art

[0002] Non-contact cylindrical gap seals are widely used in turbine machinery, such as steam turbines and gas turbines, at shaft ends and between stages due to their simple structure, easy installation, and high reliability. Innovations and breakthroughs in technologies that improve the energy efficiency and efficiency of cylindrical gap seals are of great significance.

[0003] The seal is fixedly mounted on the sealing cavity, and its inner surface is machined with a number of regularly arranged cavities and grooves. A slight radial gap is usually designed between the inner surface of the seal and the outer surface of the rotor to compensate for the operating requirements such as installation deviation, radial runout and bending deformation of the rotating shaft. This micro-gap also constitutes the main channel for medium leakage. The leaked gas or liquid is subjected to multiple throttling and expansion effects, thereby achieving the effect of reducing the amount of leakage. Due to errors during blind installation, the inner surface of the traditional fixed cylindrical gap seal and the rotor surface will form an eccentric gap. This eccentric gap has a significant negative impact on the leakage characteristics and dynamic characteristics of the seal.

[0004] Existing methods for measuring cylindrical clearance shapes make it difficult to accurately measure and actively control eccentric clearances. Accurately adjusting and measuring cylindrical clearances of varying eccentric shapes in laboratory simulated operating conditions, simulating the eccentric clearance shapes that may occur in actual engineering, is crucial for studying the sealing performance of cylindrical clearances under varying eccentricity. Furthermore, in practice, the rotor trajectory of turbine machinery changes in real time with operating conditions, such as during unit startup and shutdown, transcriticality, and variable operating conditions.

[0005] How to actively control the position of the cylindrical gap sealing liner to achieve real-time changes in the gap and thus adapt to the eccentric vortex of the rotor at different times is also an important direction for the future development of cylindrical gap sealing. Summary of the Invention

[0006] In order to solve the problem that the existing non-contact cylindrical gap sealing eccentricity test platform is difficult to achieve precise adjustment and active control of the eccentric gap, the present invention provides a cylindrical gap shape intelligent adjustment system based on active airbag drive.

[0007] The technical solution adopted in the present invention is: An intelligent control system for cylindrical gap shape based on active airbag actuation includes a floating ring disposed on the periphery of a rotating shaft, an outer cavity disposed on the periphery of the floating ring, and front and rear end caps through which the rotating shaft passes and which are sealed to the floating ring and the outer cavity at both ends. The floating ring's inner surface and the outer surface of the rotating shaft form a primary gap fluid flow channel. The inner surface of the outer cavity is uniformly distributed with airbag placement grooves, and multiple independently controllable elastic airbags are placed in the airbag placement grooves and contact the outer surface of the floating ring. The elastic airbags can control the inflation volume of local elastic airbags through external air paths, while simultaneously driving the floating ring to move, thereby adjusting the gap shape. The invention also includes an active control device, which includes a displacement sensor, an eddy current sensor, an electromagnetic proportional valve, a controller, and a PC host computer; the side of the front end cover is vertically provided with an eddy current sensor mounting hole, and the eddy current sensor is fixed to the eddy current sensor mounting hole through an eddy current sensor mounting seat to monitor the eddy motion of the rotating shaft; the outer cavity is circumferentially provided with a displacement sensor mounting threaded hole, and the displacement sensor is mounted on the outer cavity through the threaded hole to measure the displacement of the floating ring in real time; Furthermore, the eddy current sensor measures the vortex state of the rotating shaft, and the displacement sensor measures the circumferential position and displacement of the floating ring; the signals of the eddy current sensor and the displacement sensor are transmitted to the PC host computer, and the signals are processed by the PID algorithm of the PC host computer and input into the downstream controller through the control panel to drive the electromagnetic proportional valve of the airbag pressure inlet, thereby realizing active control of the shape of the elastic airbag and the cylindrical gap.

[0008] Furthermore, an airbag mounting hole is opened at the center of the elastic airbag corresponding to the outer cavity, and the threaded portion of the air nozzle of the elastic airbag passes through the airbag mounting hole of the outer cavity and is connected to the external air circuit through a pneumatic connector.

[0009] Furthermore, a cylinder gap shape intelligent control system based on active airbag drive also includes a gap adjustment screw, which is connected to the gap adjustment screw mounting hole of the outer cavity to assist the movement of the floating ring.

[0010] Furthermore, the rear end cover and the front end cover are respectively provided with a sealing ring installation groove A and a sealing ring installation groove B, and low-friction O-rings are respectively installed in the sealing ring installation groove A and the sealing ring installation groove B, and contact the end faces of the floating ring on both sides of the floating ring to prevent leakage of gap fluid when the floating ring moves up and down.

[0011] Furthermore, air leakage-proof sealing rings are respectively provided at the contact positions between the rear end cover, the front end cover and the outer cavity.

[0012] Furthermore, there are four elastic airbags, four displacement sensors, and two eddy current sensors. The four elastic airbags, four displacement sensors, and two eddy current sensors are arranged at an angle of 90° between each other to achieve measurement of the eccentric working condition of the floating ring and the dynamic working condition of the rotating shaft in a Cartesian coordinate system.

[0013] Furthermore, the elastic airbag is in a tile shape, and an air nozzle is provided on its outer curved surface. When air is inflated into the elastic airbag, its inner and outer curved surfaces will deform (bulge).

[0014] Furthermore, an intelligent control system for the cylindrical gap shape based on active airbag drive includes multiple elastic airbags, displacement sensors, and gap adjustment screws arranged along the axial direction of the rotating shaft, thereby constructing an axial eccentricity and uneven gap working condition with differences in the system inlet and outlet.

[0015] A control method for a cylindrical gap shape intelligent control system based on active airbag drive includes the following steps: Manual quick adjustment process: In the initial state, the concentricity, eccentricity and three-dimensional tilt of the floating ring can be quickly adjusted through the gap adjustment screw to achieve rapid simulation of the initial state under different gap conditions; Automatic intelligent adjustment process: Step 1) In the initial state, the elastic air bags around the floating ring are filled with gas of a predetermined pressure; Step 2) When an eccentric gap occurs between the floating ring and the rotating shaft, the displacement sensor acquires the relative position of the floating ring, while the eddy current sensor acquires the axis position of the rotating shaft. The displacement sensor and eddy current sensor transmit voltage signals to the PC host computer. Dynamic adjustments are made using the PID algorithm. The PC adjusts the pressure of the elastic airbag and uses the displacement sensor to provide feedback on the position of the floating ring. The PC then adjusts the eccentricity of the floating ring at each moment in real time, adjusting the shape of the air film gap and correcting the eccentricity of the floating ring. Step 3) When the floating ring tilts three-dimensionally relative to the rotating shaft, the displacement sensor obtains the relative position information of the front and rear ends of the floating ring, while the eddy current sensor obtains the axis position information of the rotating shaft. The displacement sensor and eddy current sensor transmit voltage signals to the PC host computer. Dynamic adjustment is performed using the PID algorithm. The PC host computer adjusts the pressure of the elastic airbag and feedbacks the position of the floating ring through the front and rear displacement sensors. The PC adjusts the floating ring's tilt state at each moment in real time to adjust the shape of the air film gap and correct the three-dimensional tilt of the floating ring.

[0016] Advantages and beneficial effects of the present invention: 1) This invention incorporates an active control structure, namely a flexible airbag and corresponding control device, on the back of the floating ring, which enables localized circumferential control. This allows for convenient and precise control of various gap shapes, including concentric annular, eccentric annular, and three-dimensional inclined gaps, for fixed stator-type cylindrical gap sealing. This simulates the different sealing gaps caused by machining and assembly errors in actual engineering.

[0017] 2) The cylindrical clearance intelligent control system is more adaptable, and the active control structure of the circumferential local control is relatively independent. It can timely adjust the local air film stiffness and damping characteristics and the position of the floating ring according to the vibration amplitude and direction of the rotating shaft, thereby more accurately controlling the system dynamic characteristics and clearance state.

[0018] 3) This invention simulates the different cylindrical gaps caused by machining and assembly errors in actual engineering, and timely adjusts the system's local air film stiffness and damping characteristics and the position of the floating ring according to the different vibration amplitudes and directions of the rotating shaft, thereby achieving real-time and precise control of the gap state and system dynamic characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an axial cross-sectional view of an active airbag cylindrical clearance adjustment system according to a first embodiment of the present invention; Figure 2 This is a three-dimensional model diagram of the active airbag cylindrical clearance adjustment system according to the first embodiment of the present invention; Figure 3 AA is a cross-sectional view of the outer cavity mid-plane of the active airbag cylindrical clearance adjustment system according to the first embodiment of the present invention; Figure 4 This is a cross-sectional view of the middle surface BB of the front end cover of the active airbag cylindrical clearance adjustment system according to the first embodiment of the present invention; Figure 5 This is a three-dimensional model diagram of the floating ring of the present invention; Figure 6 This is a three-dimensional model diagram of the elastic airbag of the present invention; Figure 7 3D model diagram and axial cross-sectional diagram of the rear end cover of the present invention; Figure 8 It is a three-dimensional model diagram and axial cross-sectional diagram of the outer cavity of the present invention; Figure 9 It is a three-dimensional model diagram and an axial cross-sectional diagram of the front end cover of the present invention; Figure 10 This is a circumferential cross-sectional view and a working principle diagram of the active airbag cylindrical clearance adjustment system according to the first embodiment of the present invention; Figure 11 This is a three-dimensional model diagram of the active airbag cylindrical clearance adjustment system according to the second embodiment of the present invention; Figure 12 1 is an internal schematic diagram of an active airbag cylindrical clearance adjustment system according to a second embodiment of the present invention; Figure 13 This is a physical diagram of the installation of the elastic airbag of the present invention; Figure 14 This is a physical picture of the elastic airbag of the present invention; Figure 15 This is a physical diagram of the system platform of the present invention; Figure 16 This is a graph showing the test results of the gap flow experiment of the present invention; Figure 17 This is a diagram showing the displacement relationship between the floating ring and the airbag pressure change of the present invention; In the figure: 1. Rotating shaft; 2. Floating ring; 2-1. Inner surface of floating ring; 2-2. End face of floating ring; 2-3. Outer surface of floating ring; 3. Elastic airbag; 3-2. Threaded part of air nozzle; 4. Rear end cover; 4-1. Sealing ring mounting groove A; 5. Outer cavity; 5-1. Displacement sensor mounting threaded hole; 5-2. Airbag placement groove; 5-3. Airbag mounting hole; 5-4. Gap adjustment screw mounting hole; 6. Front end cover; 6-1. Mounting hole; 6-2. Eddy current sensor mounting hole; 7. Low friction O-ring; 8. Anti-air leakage sealing ring; 9. Displacement sensor; 10. Pneumatic connector; 11. Eddy current sensor mounting base; 12. Eddy current sensor; 13. Gap adjustment screw. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1: Reference Figure 1-9 , an intelligent control system for cylindrical gap shape based on active airbag drive, mainly including a rotating shaft 1, a floating ring 2, an elastic airbag 3, a rear end cover 4, an outer cavity 5, a front end cover 6, a low-friction O-ring 7, an anti-air leakage sealing ring 8, a displacement sensor 9, a pneumatic joint 10, an eddy current sensor mounting base 11, an eddy current sensor 12, and a gap adjustment screw 13; The main gap fluid flow channel is formed between the inner surface 2-1 of the floating ring and the outer surface of the rotating shaft 1. The inner surface of the outer cavity is circumferentially distributed with airbag placement grooves 5-2. Multiple independently controllable elastic airbags 3 are placed in these grooves and contact the outer surface 2-3 of the floating ring. The outer cavity 5 has an airbag mounting hole 5-3 located at the center of the elastic airbag. The threaded portion 3-2 of the nozzle of the elastic airbag 3 passes through the airbag mounting hole 5-3 of the outer cavity 5 and connects to an external air circuit via a pneumatic connector 10. The elastic airbag 3 can control the inflation level of the local elastic airbag 3 through the external air circuit, thereby pushing the floating ring 2 to adjust the gap shape. Several displacement sensor mounting threaded holes 5-1 are circumferentially distributed around the outer cavity 5. Displacement sensors 9 are mounted on the outer cavity 5 through these threaded holes 5-1 to measure the displacement of the floating ring 2 in real time. A gap adjustment screw 13 is connected to the gap adjustment screw mounting hole 5-4 of the outer cavity 5 to facilitate the movement of the floating ring 2. Two eddy current sensor mounting holes 6-2 are vertically arranged on the side of the front end cover 6. Eddy current sensors 12 are secured to these holes 6-2 via eddy current sensor mounting bases 11 to monitor the shaft's eddy motion. The rear end cover 4 and front end cover 6 respectively define sealing ring mounting grooves A4-1 and B6-1. Low-friction O-rings 7 are installed within these grooves and contact the end faces 2-2 of the floating rings 2, preventing fluid leakage from the gap when the floating rings move up and down.

[0022] Reference Figure 10 The active control device is composed of a displacement sensor 9, an eddy current sensor 12, an electromagnetic proportional valve, a controller (lower controller), a PC host computer, an air supply source, a filter dryer, and a storage device. The eddy current sensor 12 can measure the vortex state of the rotating shaft 1, and the displacement sensor 9 can accurately measure the circumferential position and displacement of the floating ring 2. The voltage signals of the eddy current sensor 12 and the displacement sensor 9 are transmitted to the PC host computer. The PC host computer is used to program a PID algorithm and input it to the downstream controller through the control panel to drive the electromagnetic proportional valve, thereby achieving active control of the shape of the elastic airbag 3 and the cylindrical gap, so that the cylindrical gap shape can adapt to the motion state of the rotating shaft.

[0023] Example 2: Reference Figure 11-12 This differs from the first embodiment in that corresponding elastic airbags 3, displacement sensors 9, and gap adjustment screws 13 are added axially. This real-time example can construct an active airbag cylindrical gap adjustment system for the working condition of axial eccentricity and uneven gaps at the inlet and outlet, and use eight elastic airbags 3 to adjust and control the axial eccentricity and uneven gap in real time according to the actual working conditions.

[0024] Example 3: A method for intelligently controlling the shape of a cylindrical gap based on active airbag drive, comprising the following steps: Manual quick adjustment process of floating ring: The concentricity, eccentricity and three-dimensional tilt of the floating ring can be adjusted quickly and conveniently through the gap adjustment screw, which facilitates rapid simulation of the initial state under different gap working conditions.

[0025] Automatic intelligent adjustment process of floating ring: The airbags surrounding the floating ring are initially filled with gas at a predetermined pressure. This not only reduces the rigid impact on the floating ring during movement, but also enables faster and more precise control of the start and stop processes of the control mechanism, while also reducing the impact of the start and stop shock of the control mechanism.

[0026] In Example 1, when an eccentric gap appears in the floating ring relative to the shaft (taking the floating ring deflected to the upper right as an example), the displacement sensor obtains the relative position information of the floating ring, and the eddy current sensor obtains the position information of the axis of rotation; the displacement sensor and eddy current sensor respectively transmit voltage signals to the PC host computer, and based on this, the required pressure increase ratio of the right airbag and the upper airbag is reversed to push the floating ring back to a position concentric with the axis of rotation; this process additionally introduces a PID algorithm for dynamic adjustment, which, based on the inherent cushioning characteristics of the airbag, further reduces the impact of the working inertia and instability of the working mechanism.

[0027] In the second embodiment, the three-dimensional tilt state of the longer floating ring structure (taking the upper eccentricity of the front end and the lower eccentricity of the rear end as an example) is addressed. At this time, the airbags around the front and rear ends are adjusted with reference to the gap control mechanism of the first embodiment, so that the two ends are respectively concentric with the rotating shaft, ultimately achieving the purpose of correcting the three-dimensional tilt.

[0028] Reference Figure 13 、 14 15, showing the physical diagram of the elastic airbag parts of the present invention, the physical diagram of the elastic airbag installation, and the physical diagram of the system platform construction; The advantages of the present invention using elastic airbags for active control are as follows: 1) Evenly distributed pressure (when the airbag inflates, its flexible surface naturally conforms to the surface of the object being pushed (even if it is irregularly shaped), evenly distributing the thrust across the entire contact surface. This greatly reduces local stress concentration and avoids damage to fragile, delicate, or surface-sensitive objects being pushed. It can also effectively push flexible or irregularly shaped objects).

[0029] 2) Excellent cushioning and shock absorption properties (the airbag material itself is elastic, and the inflation and deflation process itself also has a certain compressibility and damping effect. Smooth start / stop: The beginning and end of the pushing action are very soft, avoiding rigid impact. Absorb shock and vibration: When encountering obstacles or external vibrations during the pushing process, the airbag can effectively absorb energy to protect the pushed object and the pushing mechanism itself. Overload protection: If excessive resistance is encountered, the airbag will compress and deform instead of forcibly pushing, which plays a certain overload protection role).

[0030] 3) Intrinsic safety and low risk (using compressed air, even if a rupture or leak occurs, the risk of instantaneous release of energy is much lower than that of high-pressure hydraulic systems. There is no danger of high-pressure liquid injection).

[0031] 4) Complex movements can be achieved (through the combination and arrangement of multiple airbags and independent control of air pressure, more complex movements such as tilting, bending or wave-like propulsion can be achieved).

[0032] 5) Adaptability and flexible contact (the airbag can automatically adapt to the contour and position changes of the pushed object without the need for high-precision positioning or complex guiding mechanisms; it simplifies system design and improves tolerance to workpiece tolerances and positioning errors, making it particularly suitable for handling objects with slightly deviated positions in automated production lines).

[0033] Reference Figure 16 The experimental results of leakage, where (a) shows the change of inlet and outlet leakage with time; (b) shows the change of leakage with the eccentricity of the floating ring. It can be seen that the leakage varies with different eccentricities, which can be used to guide the optimization design of the device and measure the reliability of the sealing structure under different working conditions, reflecting the superiority of the active elastic airbag control of the present invention for gap shape adjustment.

[0034] Reference Figure 17 The relationship between the floating ring and the pressure change of the lower airbag shows that the airbag-driven floating ring has stable controllability and excellent anti-interference ability.

[0035] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The scope of protection of the present invention should not be regarded as limited to the specific forms described in the embodiments. The scope of protection of the present invention also involves equivalent technical means that can be thought of by those skilled in the art based on the inventive concept.

Claims

1. An intelligent control system for cylindrical gap shape based on active airbag drive, characterized in that: It comprises a floating ring (2) arranged on the periphery of a rotating shaft (1), an outer cavity (5) arranged on the periphery of the floating ring (2), a front end cover (6) and a rear end cover (4) for the rotating shaft to pass through and sealedly connected to the floating ring (2) and the outer cavity (5) at both ends; a main gap fluid flow channel is formed between the inner surface (2-1) of the floating ring (2) and the outer surface of the rotating shaft (1); the inner surface of the outer cavity (5) is uniformly distributed with airbag placement grooves (5-2) in the circumferential direction, and a plurality of independently controllable elastic airbags (3) are placed in the airbag placement grooves (5-2) and contact the outer surface (2-3) of the floating ring; the elastic airbags (3) can control the inflation amount of the elastic airbags (3) through an external air path, and at the same time push the floating ring (2) to move, thereby adjusting the gap shape; The active control device also includes a displacement sensor (9), an eddy current sensor (12), an electromagnetic proportional valve, a controller, and a PC host computer; the front end cover (6) is vertically provided with an eddy current sensor mounting hole (6-2), and the eddy current sensor (12) is fixed on the eddy current sensor mounting hole (6-2) through an eddy current sensor mounting seat (11) to monitor the eddy motion of the rotating shaft (1); the outer cavity (5) is circumferentially provided with a displacement sensor mounting threaded hole (5-1), and the displacement sensor (9) is installed on the outer cavity (5) through the threaded hole (5-1) to measure the displacement of the floating ring (2) in real time; The eddy current sensor (12) measures the vortex state of the rotating shaft (1), and the displacement sensor (9) measures the circumferential position and displacement of the floating ring (2); the signals of the eddy current sensor (12) and the displacement sensor (9) are transmitted to a PC host computer, the signals are processed by a PID algorithm of the PC host computer, and the signals are input to a downstream controller through a control panel to drive the electromagnetic proportional valve of the airbag pressure inlet, thereby realizing active control of the shape of the elastic airbag (3) and the cylindrical gap.

2. According to claim 1, a cylinder gap shape intelligent control system based on active airbag drive is characterized in that: An airbag mounting hole (5-3) is provided in the outer cavity (5) at a central position corresponding to the elastic airbag, and a threaded portion (3-2) of the air nozzle of the elastic airbag (3) passes through the airbag mounting hole (5-3) of the outer cavity (5) and is connected to an external air circuit via a pneumatic connector (10).

3. According to claim 1, a cylinder gap shape intelligent control system based on active airbag drive is characterized in that: It also includes a gap adjustment screw (13), which is connected to the gap adjustment screw mounting hole (5-4) of the outer cavity (5) to assist the floating ring (2) in moving.

4. According to claim 1, a cylinder gap shape intelligent control system based on active airbag drive is characterized in that: The rear end cover (4) and the front end cover (6) are respectively provided with a sealing ring installation groove A (4-1) and a sealing ring installation groove B (6-1). Low-friction O-rings (7) are respectively installed in the sealing ring installation groove A (4-1) and the sealing ring installation groove B (6-1) and contact the floating ring end faces (2-2) on both sides of the floating ring (2) to prevent leakage of gap fluid when the floating ring moves up and down.

5. According to claim 1, a cylinder gap shape intelligent control system based on active airbag drive is characterized in that: Anti-air leakage sealing rings (8) are respectively provided at the contact positions between the rear end cover (4), the front end cover (6) and the outer cavity (5).

6. According to claim 1, a cylinder gap shape intelligent control system based on active airbag drive is characterized in that: The elastic airbags (3) are provided with four, the displacement sensors (9) are provided with four, and the eddy current sensors (12) are provided with two. The four elastic airbags (3), the four displacement sensors (9), and the two eddy current sensors (12) are arranged adjacent to each other at an angle of 90 degrees, so as to realize the measurement of the eccentric working condition of the floating ring (2) and the dynamic working condition of the rotating shaft (1) in a Cartesian coordinate system.

7. According to claim 1, a cylinder gap shape intelligent control system based on active airbag drive is characterized in that: The elastic airbag (3) is tile-shaped, and an air nozzle is provided on its outer curved surface. When air is inflated into the elastic airbag (3), its inner and outer curved surfaces will deform.

8. According to claim 3, a cylinder gap shape intelligent control system based on active airbag drive is characterized in that: The invention comprises a plurality of elastic air bags (3), a displacement sensor (9), and a gap adjustment screw (13) arranged axially along a rotating shaft (1), thereby constructing an axial eccentric uneven gap working condition with differences between the inlet and outlet of the system.

9. A control method for a cylinder gap shape intelligent control system based on active airbag drive, characterized in that: The steps include: Manual quick adjustment process: In the initial state, the concentricity, eccentricity and three-dimensional tilt of the floating ring can be quickly adjusted through the gap adjustment screw to achieve rapid simulation of the initial state under different gap conditions; Automatic intelligent adjustment process: Step 1) In the initial state, the elastic air bags around the floating ring are filled with gas of a predetermined pressure; Step 2) When an eccentric gap occurs between the floating ring and the rotating shaft, the displacement sensor acquires the relative position of the floating ring, while the eddy current sensor acquires the axis position of the rotating shaft. The displacement sensor and eddy current sensor transmit voltage signals to the PC host computer. Dynamic adjustments are made using the PID algorithm. The PC adjusts the pressure of the elastic airbag and uses the displacement sensor to provide feedback on the position of the floating ring. The PC then adjusts the eccentricity of the floating ring at each moment in real time, adjusting the shape of the air film gap and correcting the eccentricity of the floating ring. Step 3) When the floating ring tilts three-dimensionally relative to the rotating shaft, the displacement sensor obtains the relative position information of the front and rear ends of the floating ring, while the eddy current sensor obtains the axis position information of the rotating shaft. The displacement sensor and eddy current sensor transmit voltage signals to the PC host computer. Dynamic adjustment is performed using the PID algorithm. The PC host computer adjusts the pressure of the elastic airbag and feedbacks the position of the floating ring through the front and rear displacement sensors. The PC adjusts the floating ring's tilt state at each moment in real time to adjust the shape of the air film gap and correct the three-dimensional tilt of the floating ring.

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