A longitudinal-torsional coupled vibration absorber based on magnetorheology

Abstract

The utility model discloses a longitudinal torsional coupling vibration absorber based on magnetorheological, including retaining ring, intermediate ring and set up between intermediate ring and retaining ring's damping mechanism, and damping mechanism includes at least 4 magnetorheological vibration absorption subassembly and elastic rod subassembly of equidistance arrangement, and magnetorheological vibration absorption subassembly includes coil unit and the magnetorheological elastomer and permanent magnet of assembly in coil unit, and coil unit is used for providing excitation magnetic field, and permanent magnet is used for providing basic magnetic field, and magnetorheological elastomer is used for elastic abutment intermediate ring, and excitation magnetic field and basic magnetic field superposition form the compound magnetic field for adjusting magnetorheological elastomer's damping and rigidity, under the cooperation of elastic rod subassembly and magnetorheological vibration absorption subassembly, can synchronous control ship shafting's vibration in longitudinal and torsional direction, to realize multidimensional damping, and then promote overall vibration absorption capacity.

Description

Technical Field

[0001] This utility model relates to the field of marine power technology, and in particular to a longitudinal-torsional coupling vibration absorber based on magnetorheology. Background Technology

[0002] During the operation of a ship's power plant, the ship's shafting is subjected to various impact forces and vibrations, which can cause various forms of vibration such as bending, longitudinal and torsional vibrations. This can increase fatigue damage to the ship's shafting and, in severe cases, lead to shafting failure, affecting the reliability of the ship.

[0003] Ship shafting typically experiences both torsional and longitudinal vibrations simultaneously, which can generate strong coupled vibrations. However, existing vibration absorbers are limited by their mechanical structure and cannot simultaneously suppress both torsional and longitudinal vibrations. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a magnetorheologically based longitudinal-torsional coupling vibration absorber that can synchronously control the vibration of the ship's shafting in both longitudinal and torsional directions, thereby achieving multi-dimensional vibration reduction and enhancing the overall vibration absorption capacity.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] This invention provides a magnetorheologically based longitudinal-torsional coupling vibration absorber, comprising a retaining ring, an intermediate ring located within the retaining ring and used to connect a ship's shafting, and a vibration damping mechanism disposed between the intermediate ring and the retaining ring. The vibration damping mechanism includes at least four equally spaced magnetorheological vibration absorption components and at least four equally spaced elastic rod components. One end of each elastic rod component is connected to the retaining ring, and the other end is connected to the intermediate ring. Each magnetorheological vibration absorption component includes a coil unit and a magnetorheological elastomer and a permanent magnet assembled within the coil unit. The coil unit provides an excitation magnetic field, the permanent magnet provides a base magnetic field, and the magnetorheological elastomer elastically abuts against the intermediate ring. The excitation magnetic field and the base magnetic field are superimposed to form a composite magnetic field for adjusting the damping and rigidity of the magnetorheological elastomer. The elastic rod components and the magnetorheological vibration absorption components cooperate to form a vibration damping configuration for the ship's shafting connected to the intermediate ring in both its longitudinal and torsional directions.

[0007] Furthermore, the number of magnetorheological vibration absorption components is eight; two magnetorheological vibration absorption components correspond to one elastic rod assembly; the elastic rod assembly includes two stabilizing rods; the magnetorheological vibration absorption components and the elastic rod assembly are respectively arranged around the intermediate ring.

[0008] Furthermore, the retaining ring is equipped with four first mounting seats arranged at equal intervals, and the outer circumferential surface of the intermediate ring is equipped with four second mounting seats arranged at equal intervals; one end of each pair of adjacent magnetorheological vibration absorption components is connected to one of the first mounting seats, and the other end is connected to one of the second mounting seats; the two ends of the two stabilizer bars in the same group are respectively connected to the corresponding first mounting seats and second mounting seats.

[0009] Furthermore, the coil unit includes a coil frame, a coil, and a soft iron core; the coil, the soft iron core, and the permanent magnet are all assembled on the coil frame, and the magnetorheological elastomer is disposed between the soft iron core and the second mounting base, with the permanent magnet disposed at the end of the soft iron core away from the magnetorheological elastomer; the coil frame is connected to the first mounting base.

[0010] Furthermore, the permanent magnets of every two adjacent magnetorheological vibration damping components have opposite magnetic pole directions.

[0011] Furthermore, the magnetorheological elastomer is a magnetorheological rubber.

[0012] Furthermore, the magnetorheological elastomer contains magnetic particles with an inclined chain-like structure.

[0013] Furthermore, the permanent magnet is a hard magnetic ring.

[0014] Furthermore, it also includes torque sensors and acceleration sensors to collect longitudinal and torsional vibration signals of the ship's shafting in real time.

[0015] Furthermore, the number of magnetorheological vibration absorption components is an even number.

[0016] The technical solution provided by this utility model has the following beneficial effects:

[0017] 1. This utility model is based on the variable damping and stiffness characteristics of magnetorheological elastomers, which can realize synchronous control of the vibration of ship shafting in the longitudinal and torsional directions to achieve multi-dimensional vibration reduction and thus improve the overall vibration absorption capacity.

[0018] 2. This utility model effectively expands the adjustable range of the composite magnetic field by configuring a basic magnetic field structure in the vibration absorber, thereby enhancing the mechanical response capability of the magnetorheological elastomer, that is, significantly improving the vibration suppression efficiency of the vibration absorber.

[0019] 3. By setting an elastic rod assembly between the intermediate ring and the retaining ring, this utility model can effectively improve the stress distribution of the structure, enhance the overall mechanical stability, thereby extending the service life of the vibration absorber and improving its reliability under long-term vibration conditions. Attached Figure Description

[0020] Figure 1 The figure shown is a schematic diagram of the longitudinal-torsional coupling vibration absorber based on magnetorheology in the embodiment.

[0021] Figure 2 The figure shown is a cross-sectional view of the longitudinal-torsional coupling vibration absorber based on magnetorheology in the embodiment. Detailed Implementation

[0022] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] Reference Figure 1 and Figure 2 This embodiment provides a magnetorheological longitudinal-torsional coupling vibration absorber (hereinafter referred to as the absorber) to simultaneously suppress longitudinal-torsional vibrations in ship shafting under complex operating conditions with frequent changes (such as frequency conversion, load conversion, etc.).

[0025] The vibration absorber in this embodiment includes a retaining ring 3, an intermediate ring 1 located inside the retaining ring 3 for connecting the ship's shafting, a vibration damping mechanism disposed between the intermediate ring 1 and the retaining ring 3, and a torque sensor and an acceleration sensor for real-time acquisition of longitudinal and torsional vibration signals of the ship's shafting.

[0026] The vibration damping mechanism of this embodiment includes eight magnetorheological vibration absorption components arranged at equal intervals and four elastic rod components arranged at equal intervals. Two magnetorheological vibration absorption components correspond to one elastic rod component, and each magnetorheological vibration absorption component and each elastic rod component are respectively arranged in a ring around the middle ring 1.

[0027] More specifically, the magnetorheological vibration damping assembly includes a coil unit and a magnetorheological elastomer 4 and a permanent magnet 9 assembled within the coil unit. The coil unit includes a coil frame, a coil 6, and a soft iron core 8. The coil 6, soft iron core 8, and permanent magnet 9 are all assembled within the coil frame. The coil 6 and soft iron core 8 together form the excitation magnetic field. The magnetic poles of the permanent magnets 9 in every two adjacent magnetorheological vibration damping assemblies are opposite in direction, thus forming a basic magnetic field loop between the two adjacent permanent magnets 9. The magnetorheological elastomer 4 elastically abuts against the intermediate ring 1, and the excitation magnetic field and the basic magnetic field are superimposed to form a composite magnetic field used to adjust the damping and rigidity of the magnetorheological elastomer 4.

[0028] The retaining ring 3 is equipped with four first mounting seats 5 arranged at equal intervals, and the outer circumference of the intermediate ring 1 is equipped with four second mounting seats 2 arranged at equal intervals. The outward end of each pair of adjacent magnetorheological vibration absorption components is connected to one of the first mounting seats 5, and the inward end is connected to one of the second mounting seats 2. The specific elastic rod assembly includes two elastic stabilizing rods 7, and the axial ends of the two stabilizing rods 7 in the same group are respectively connected to the upper and lower surfaces of the corresponding first mounting seats 5 and second mounting seats 2.

[0029] Therefore, the elastic rod assembly and the magnetorheological vibration damping assembly work together to form a vibration damping configuration for the ship shafting connected to the intermediate ring 1 in its longitudinal and torsional directions.

[0030] In this embodiment, the specific magnetorheological elastomer 4 is a magnetorheological rubber body with magnetic particles having an inclined chain structure, and the specific permanent magnet 9 is a hard magnetic ring.

[0031] In specific implementation, a magnetorheological elastomer 4 is provided between the soft iron core 8 and the second mounting base 2, and the inward end of each magnetorheological elastomer 4 is attached to the second mounting base 2 on the intermediate ring 1 by an adhesive process, and the outward end of the magnetorheological elastomer 4 is attached to the inward end of the soft iron core 8 away from the permanent magnet 9 by an adhesive process. The permanent magnet 9 is located on the outside of the soft iron core 8 away from the magnetorheological elastomer 4, and the coil frame of each magnetorheological vibration absorption component is fixedly connected to the corresponding first mounting base 5 by bolts.

[0032] When the vibration absorber is energized, each coil unit generates an excitation magnetic field, which is vector-superimposed with the base magnetic field to form a composite magnetic field. The composite magnetic field is then adjusted in real time by regulating the magnitude and direction of the input current of coil 6. Specifically, if the excitation magnetic field and the base magnetic field are in opposite directions, the excitation magnetic field is enhanced to a specific value that can cancel out the base magnetic field, and the magnetic field strength of the composite magnetic field drops to zero. Conversely, if the excitation magnetic field and the base magnetic field are in the same direction, the two magnetic fields can be enhanced and superimposed, and the composite magnetic field increases to the highest strength required by the vibration reduction system. Therefore, this embodiment can achieve continuous and precise adjustment from zero to the target value, that is, to achieve wide-range control of the strength and direction of the composite magnetic field and significantly expand the magnetic field control range, so as to ensure that the damping characteristics and stiffness of the magnetorheological elastomer 4 can vary within a wider range, thereby improving the overall vibration absorption capacity.

[0033] The vibration absorber in this embodiment adopts a closed-loop control strategy. It uses torque and acceleration sensors to collect longitudinal and torsional vibration signals in real time to help control the magnitude and direction of the input current of each coil 6, thereby generating a controllable composite magnetic field that acts on each magnetorheological elastomer 4. This allows the natural frequency of the vibration absorber to dynamically track the excitation frequency, thus achieving adaptive suppression of longitudinal and torsional vibration.

[0034] The elastic rod assembly of this embodiment can effectively coordinate the motion state of the intermediate ring 1 and the retaining ring 3 during vibration, so that their vibration direction and frequency are highly consistent. This not only maintains the vibration absorption efficiency, but also significantly reduces the excessive stretching of the magnetorheological elastomer 4 caused by asynchronous vibration, thereby effectively extending the service life of the vibration absorber and enhancing its working stability.

[0035] In summary, this embodiment utilizes the variable damping and adjustable stiffness characteristics of the magnetorheological elastomer 4 to achieve synchronous control of the vibration of the ship shafting in the longitudinal and torsional directions, thereby realizing multi-dimensional vibration reduction and improving the overall vibration absorption capacity.

[0036] Furthermore, this embodiment effectively expands the adjustable range of the composite magnetic field by configuring a basic magnetic field structure in the vibration absorber, thereby enhancing the mechanical response capability of the magnetorheological elastomer 4 and significantly improving the vibration suppression efficiency of the vibration absorber.

[0037] In addition, this embodiment improves the stress distribution of the structure and enhances the overall mechanical stability by setting an elastic rod assembly between the intermediate ring 1 and the retaining ring 3, thereby extending the service life of the vibration absorber and improving its reliability under long-term vibration conditions.

[0038] Of course, in other embodiments, the number of magnetorheological vibration-absorbing components is not limited to this. A more complex composite magnetic circuit structure can be formed by increasing the number of units to further enhance the magnetic field superposition effect and expand the magnetic field control range, thereby achieving more precise control over the damping and stiffness of the magnetorheological elastomer 4. Furthermore, optimizing the overall arrangement of each magnetorheological vibration-absorbing component can further improve the vibration suppression capability of the absorber, thereby enhancing its adaptability and control performance under different operating conditions.

[0039] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A longitudinal-torsional coupling vibration absorber based on magnetorheology, characterized in that: It includes a retaining ring, an intermediate ring located within the retaining ring and used for connecting the ship's shafting, and a vibration damping mechanism disposed between the intermediate ring and the retaining ring; The vibration damping mechanism includes at least four magnetorheological vibration absorption components arranged at equal intervals and at least four elastic rod components arranged at equal intervals; one end of each elastic rod component is connected to the retaining ring, and the other end is connected to the intermediate ring; each magnetorheological vibration absorption component includes a coil unit and a magnetorheological elastomer and a permanent magnet assembled in the coil unit, the coil unit is used to provide an excitation magnetic field, the permanent magnet is used to provide a base magnetic field, the magnetorheological elastomer is used to elastically abut against the intermediate ring, and the excitation magnetic field and the base magnetic field are superimposed to form a composite magnetic field for adjusting the damping and rigidity of the magnetorheological elastomer; The elastic rod assembly and the magnetorheological vibration absorption assembly work together to form a vibration damping configuration for the ship shafting connected to the intermediate ring in its longitudinal and torsional directions.

2. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to claim 1, characterized in that: The number of magnetorheological vibration absorption components is 8; two magnetorheological vibration absorption components correspond to one elastic rod assembly; the elastic rod assembly includes two stabilizing rods; the magnetorheological vibration absorption components and the elastic rod assembly are respectively arranged around the intermediate ring.

3. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to claim 2, characterized in that: The retaining ring is equipped with four first mounting seats arranged at equal intervals, and the outer circumferential surface of the intermediate ring is equipped with four second mounting seats arranged at equal intervals; one end of each pair of adjacent magnetorheological vibration absorption components is connected to one of the first mounting seats, and the other end is connected to one of the second mounting seats; the two ends of the two stabilizer bars in the same group are connected to the corresponding first mounting seats and second mounting seats respectively.

4. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to claim 3, characterized in that: The coil unit includes a coil frame, a coil, and a soft iron core; the coil, the soft iron core, and the permanent magnet are all assembled on the coil frame, and the magnetorheological elastomer is disposed between the soft iron core and the second mounting base, with the permanent magnet disposed at the end of the soft iron core away from the magnetorheological elastomer; the coil frame is connected to the first mounting base.

5. The magnetorheological longitudinal-torsional coupling vibration absorber according to claim 4, characterized in that: The permanent magnets of every two adjacent magnetorheological vibration damping components have opposite magnetic pole directions.

6. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to any one of claims 1-5, characterized in that: The magnetorheological elastomer is a magnetorheological rubber.

7. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to claim 6, characterized in that: The magnetorheological elastomer contains magnetic particles with an inclined chain-like structure.

8. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to any one of claims 1-5, characterized in that: The permanent magnet is a hard magnetic ring.

9. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to any one of claims 1-5, characterized in that: It also includes torque sensors and acceleration sensors for real-time acquisition of longitudinal and torsional vibration signals of the ship's shafting.

10. The magnetorheologically based longitudinal-torsional coupling vibration absorber according to claim 1, characterized in that: The number of magnetorheological vibration damping components is an even number.

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