CN-122014749-A - Magnetic-water composite vibration reduction bearing based on polar region magnetic field self-adaptive regulation and control

CN122014749ACN 122014749 ACN122014749 ACN 122014749ACN-122014749-A

Abstract

The invention belongs to the technical field of magnetic field regulation and hydrodynamic force support compounding, and discloses a magnetic-water compound vibration reduction bearing based on polar region magnetic field self-adaptive regulation, which comprises a rotor, a stator, a water lubrication film layer and a magnetic field generation assembly coaxially arranged with the stator; the magnetic water composite vibration reduction bearing with the self-adaptive magnetic pole distribution further comprises a self-adaptive magnetic pole distribution unit, a distributed induction unit and a double-ring controller. The magnetic-water composite vibration damping bearing has the advantages of strong self-adaptive bearing capacity, excellent broadband vibration damping and low noise performance, high safety and redundancy, good engineering adaptability and the like.

Inventors

ZHOU MENGDE
LIU WEI
WANG YUNING
YAN YING
CHENG XIKANG
YUAN WENTAO
LIANG ZHIHENG
ZHANG HAOXUAN
HU CHENKAI
Yao Zhuoxin

Assignees

大连理工大学

Dates

Publication Date: 20260512
Application Date: 20260407

Claims (7)

1. The magnetic-water composite vibration reduction bearing based on the polar region magnetic field self-adaptive regulation comprises a rotor, a stator, a water lubrication film layer and a magnetic field generation assembly coaxially arranged with the stator, and is characterized by further comprising a self-adaptive magnetic pole distribution unit, a distributed induction unit and a double-ring controller; The self-adaptive magnetic pole distribution unit is arranged into a pole shoe array along the circumferential direction of the stator, the pole shoe array is composed of a plurality of soft magnetic pole shoes, the soft magnetic pole shoes are circumferentially distributed at equal intervals along the inner circumferential wall of the stator, and a single soft magnetic pole shoe independently forms an independent region; The distributed induction unit comprises a magnetic density sensor, a displacement sensor, a strain sensor and a vibration sensor, and a plurality of detection points are distributed along the inner periphery of the stator, the bearing seat and the outer Zhou Anzhou of the stator in the axial direction; forming a detection point at the same region in the circumferential direction of the stator and at the same layer in the axial direction, wherein each detection point is provided with a magnetic density sensor, a displacement sensor, a strain sensor and a vibration sensor, and the detection point is used for acquiring real-time measurement results of each region, including a space distribution field of magnetic flux density, rotor load, eccentric state of the rotor and thickness change of a water lubrication film; The dual-ring controller is a double-layer control framework of a current inner ring and a state outer ring, wherein the state outer ring is internally provided with a model predictive control algorithm and a gain scheduling control algorithm, the magnetic density sensor, the displacement sensor, the strain sensor and the vibration sensor are configured in one-to-one correspondence with all regions in the circumferential direction of the stator, the spatial distribution field of the magnetic flux density of the corresponding regions, the eccentric state of the rotor, the rotor load and the thickness change of a water lubricating film layer are respectively collected and transmitted to the state outer ring of the dual-ring controller, the state outer ring generates a corresponding current adjusting instruction according to a real-time measuring result, after the current inner ring receives the instruction, an electromagnetic correction coil of a corresponding soft magnetic pole shoe is driven, and the magnetic flux density of each region is differentially adjusted on the premise of keeping a permanent magnet bias body unchanged, so that the spatial distribution field of the magnetic flux density is matched with the rotor load and the thickness change of the water lubricating film layer in real-time, and the magnetic water composite vibration reduction bearing with self-adaptive bearing and vibration reduction capability is formed.
2. The magnetic-water composite vibration-damping bearing based on polar region magnetic field self-adaptive regulation according to claim 1, wherein the number of the soft magnetic pole shoes is 8-24, and discrete polar regions are formed in the circumferential direction of the stator, so that the magnetic flux density is independently regulated according to the polar regions.
3. The magnetic-water composite vibration reduction bearing based on polar region magnetic field adaptive regulation and control according to claim 1, wherein the magnetic-water composite vibration reduction bearing is characterized in that The permanent magnet bias body is a magnetic pole part of which the soft magnetic pole shoe faces to the radial air gap of the bearing and is made of NdFeB or SmCo rare earth permanent magnet material, and is of an arc-shaped block structure which is matched with the radian of the inner peripheral wall of the stator, and an anti-corrosion coating is sprayed on the surface of the permanent magnet bias body.
4. The magnetic-water composite vibration reduction bearing based on polar region magnetic field adaptive regulation and control according to claim 1, wherein the magnetic-water composite vibration reduction bearing is characterized in that The magnetic density sensors are embedded in the inner peripheral wall of the stator, at least one magnetic density sensor is uniformly distributed on each axial layer at each region in the circumferential direction of the stator, a detection ring is formed by layering along the axial direction of the stator, the displacement sensors are arranged on one side of the inner peripheral wall of the stator, which faces towards a radial air gap of the bearing, each region in the circumferential direction of the stator is provided with one displacement sensor, the strain sensors are attached to the back wall of the bearing seat, each load transmission position of each region in the circumferential direction of the bearing seat opposite to each region in the circumferential direction of the stator is provided with one strain sensor, the vibration sensors are fixed on the outer side wall of the stator, and each vibration sensor is arranged at each region in the circumferential direction of the stator and at each vibration damping position of the bearing and are distributed in a layered manner along the axial direction of the stator.
5. The magnetic-water composite vibration-damping bearing based on polar region magnetic field self-adaptive regulation and control according to claim 1, wherein the permanent magnet bias body in each soft magnetic pole shoe provides magnetic flux to the radial air gap of the bearing in the non-energized state, and the electromagnetic correction coil is only used for superposing forward magnetic flux or reverse magnetic flux on the magnetic flux, so as to realize fine adjustment and reconstruction of local magnetic pole intensity.
6. The magnetic-water composite vibration reduction bearing based on the polar region magnetic field self-adaptive regulation and control according to claim 1, wherein the magnetic density sensors are distributed in the stator along 8-24 measuring points in the circumferential direction and along 2-4 layers in the axial direction, the circumferential measuring points are arranged in one-to-one correspondence with 8-24 soft magnetic pole shoes in the circumferential direction of the stator, each soft magnetic pole shoe corresponds to at least 1 magnetic density sensor arranged in the circumferential direction, detection rings are arranged in layers according to the effective bearing section of the bearing in the axial direction, each layer of detection rings are distributed in position matching with the soft magnetic pole shoes, and the whole magnetic density sensor is in three-dimensional array layout matched with the pole shoe array and used for acquiring a space distribution field of magnetic flux density.
7. The magnetic-water composite vibration reduction bearing based on polar region magnetic field self-adaptive regulation and control according to claim 1, wherein when the electromagnetic correction coil is deenergized, the permanent magnet bias body and the water lubrication film layer jointly provide passive bearing, so that the rotor still keeps stable running within a certain time.

Description

Magnetic-water composite vibration reduction bearing based on polar region magnetic field self-adaptive regulation and control Technical Field The invention belongs to the technical field of magnetic field regulation and control and hydrodynamic force support compounding, and relates to a magnetic-water compound vibration reduction bearing based on polar region magnetic field self-adaptive regulation and control. Background In a ship propulsion system, a main bearing is used as an important supporting part of a propulsion shafting, plays key functions of supporting shafting operation, transmitting propulsion power, inhibiting shafting vibration from transmitting to a hull structure and the like, and is one of core equipment for guaranteeing the running stability and the structural safety of the ship propulsion system. With the development of modern ships to high speed, stealth and high reliability, the main bearing not only needs to meet basic bearing and lubrication requirements, but also has increasingly prominent effects in reducing shafting vibration and controlling underwater radiation noise, and has become an important factor affecting the comprehensive performance of the ships. Therefore, the research and development of the high-performance and low-noise main bearing technology have important engineering significance for realizing the high-efficiency, reliable and low-noise operation of the ship propulsion system. In the prior engineering application, the water-lubricated main bearing takes water as a lubricating medium, has the advantages of environmental friendliness, strong cooling capacity, suitability for ocean working conditions and the like, and is widely applied to ship propulsion shafting. However, under complex sea conditions and variable working conditions, the propulsion shafting is often accompanied with disturbance factors such as load fluctuation, periodic excitation, external impact and the like, and the problems of uneven bearing distribution, aggravation of water film thickness fluctuation, local resonance amplification and the like easily occur in the traditional water lubrication main bearing, so that the stability of shafting operation is reduced, the vibration and noise level is increased, and the requirements of a high-performance ship on low-noise and high-reliability operation are difficult to meet. In order to improve the problems, a magnetic water composite main bearing technology is proposed in recent years, and a permanent magnet or electromagnetic structure is introduced in the radial direction of the bearing to provide additional magnetic bearing capacity and magnetic rigidity, so that the overall rigidity and damping characteristic of the system are improved to a certain extent, and the resistance of the bearing to external disturbance is enhanced. However, most of the existing magnetic water composite main bearings adopt a fixed magnetic pole distribution or a global electromagnetic regulation mode based on a single control quantity, the magnetic field distribution lacks flexibility for local working condition change, and quick redistribution of magnetic flux density is difficult to realize under complex conditions such as oblique unbalanced load, impact load or variable speed operation. Meanwhile, the water lubricating film mainly depends on the hydrodynamic effect to provide passive support, has limited adaptability to transient load change and low-speed heavy-load working conditions, and is difficult to continuously maintain good vibration reduction and silencing performance under strong external disturbance conditions. In summary, the prior art lacks a magnetic-water composite bearing structure and a control scheme capable of adjusting the magnetic field distribution in real time in polar regions according to the shafting load state and the running condition change and forming a cooperative compensation mechanism with the water lubrication film. How to realize the self-adaptive regulation and control of magnetic field distribution and water film supporting characteristics while guaranteeing the advantages of magnetic bearing capacity and water lubrication so as to improve the bearing uniformity, impact resistance and vibration reduction and noise reduction performance of the bearing under complex sea conditions has become a key technical problem to be solved in the field of ship propulsion shafting. Disclosure of Invention The invention provides a magnetic-water composite vibration reduction bearing based on polar region magnetic field self-adaptive regulation and control, which aims to solve the problems of uneven bearing distribution, large vibration noise, insufficient adaptability to working condition change and the like of the existing ship propulsion shafting bearing under a complex working condition. The bearing realizes real-time matching of magnetic pole strength and spatial distribution to load and water film state through a cooperative regulation and co