Electro-magnetically driven gear system torsional-lateral coupled vibration control device

Abstract

This invention discloses a torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, comprising a base, a stator fixed to the base, a gear body connected to the shaft body, and a mover fixed to the gear shaft body. The mover is located in the middle of the stator, and a magnetorheological fluid is injected into and sealed in the cavity between the stator and the mover. Two sets of torsional excitation coils wound along the circumferential direction of the shaft are symmetrically arranged in the stator about the mover. The tangential torque of the magnetorheological fluid is changed by adjusting the excitation current. A torsional vibration isolation ring is provided in the inner diameter direction of the torsional excitation coil windings. Multiple pairs of poles are provided in the stator, and a uniform air gap is provided between the poles and the mover. A transverse vibration excitation coil is wound on each pole, and each set of transverse vibration excitation coils forms an electromagnet. The transverse constraint of the electromagnet on the mover is changed by adjusting the excitation current. A transverse vibration isolation ring is provided between the mover and the stator wall. This invention can reduce vibration and noise.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and noise reduction technology for large ship propulsion systems, specifically to a torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive. Background Technology

[0002] The demand for large ships is gradually increasing. However, due to the variable environmental conditions during surface navigation and the complex multi-source excitation within the system, the abnormal vibrations and noise generated during the operation of the propulsion system seriously threaten the reliable operation of the entire device, shorten the service life of the equipment, and pose a huge safety hazard to ship navigation.

[0003] Marine gear transmission systems are key structures for achieving power convergence and output. Their lateral-torsional coupled vibrations primarily originate from three sources: first, the dynamic excitation exerted on the gearbox input shaft by the main power unit (including steam turbines, gas turbines, and electric motors); second, the fluid pulsation excitation experienced by the stern propeller operating in a non-uniform wake field; and third, the internal excitation resulting from the combined effects of time-varying meshing stiffness, nonlinear tooth surface friction, and nonlinear oil film support during gear meshing. These three excitations subject the gears and their associated rotor and bearing systems to dynamic torques around the axis of rotation and dynamic loads perpendicular to the axis of rotation, increasing the potential risk of torsional-lateral coupled vibrations in the system.

[0004] In recent years, vibration control of gear transmission systems has been carried out from two relatively independent perspectives. The first is for gear structure, mainly focusing on vibration isolation of the gearbox, with the main focus on vibration isolation of the gear meshing excitation frequency. This is achieved by adding elastic elements (stiffness) or energy dissipators (damping) between the gearbox and the foundation to reduce the vibration and noise generated by the gearbox. The second is for lateral vibration control of the rotating shaft system, mainly focusing on vibration control of the rotor shaft frequency and the stern propeller blade frequency. This is achieved by arranging electromagnetic, piezoelectric, electro-hydraulic, and hydraulic drive control modules radially in the shaft system to achieve active and semi-active control of the lateral vibration transmission of the gear shaft.

[0005] In fact, gear transmission systems are multi-directional, multi-structure coupled vibration systems. Vibration transmission control methods targeting different vibration directions and different structural components often have mutual influence and interference. Existing vibration reduction and noise reduction measures are difficult to achieve effective decoupling of vibration control in all directions. Summary of the Invention

[0006] The purpose of this invention is to provide a torsional-lateral coupling vibration control device for gear systems based on electro-magnetic drive, so as to overcome the shortcomings of existing vibration reduction and noise reduction technologies for gear transmission systems.

[0007] The technical solution to achieve the purpose of this invention is as follows:

[0008] A torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive includes a base, a stator fixed to the base, a gear body connected to the shaft body, and a mover fixed to the gear shaft body.

[0009] The mover is located in the middle of the stator, and magnetorheological fluid is injected into the cavity between the stator and the mover and then sealed.

[0010] The stator is symmetrically arranged with respect to the mover with two sets of torsional excitation coils wound along the circumferential direction of the shaft. By adjusting the excitation current, the tangential torque of the magnetorheological fluid is changed, which is used to generate a dynamic damping torque opposite to the rotation direction of the shaft body.

[0011] A torsional vibration isolation ring is provided in the inner diameter direction of the torsional vibration excitation coil winding to prevent the magnetic lines of force from being too dense around the torsional vibration excitation coil and to allow the magnetic lines of force to pass through the magnetorheological fluid fully.

[0012] The stator is provided with multiple pairs of poles, and a uniform air gap is provided between the poles and the mover. Each pole is wound with a transverse vibration excitation coil, and each pair of transverse vibration excitation coils forms an electromagnet. By adjusting the excitation current, the transverse constraint of the electromagnet on the mover is changed, which is used to control the transverse vibration transmission of the gear body.

[0013] A transverse vibration isolation ring is provided between the moving and stator walls to limit the range of the magnetic field generated by the transverse vibration excitation coil and avoid mutual interference with the magnetic field loop generated by the torsional vibration excitation coil.

[0014] The significant advantages of this invention compared to existing technologies are:

[0015] (1) This invention adjusts the tangential damping of the magnetorheological fluid by changing the current of the input torsional excitation coil, generating a dynamic damping torque opposite to the rotation direction of the shaft body 1, thereby counteracting the torsional vibration transmission of the system; this invention also counteracts the lateral vibration transmission of the transmission system by adjusting the dynamic electromagnetic force of the eight poles on the stator. By suppressing the torsional-lateral coupled vibration of the system, the purpose of system vibration reduction and noise reduction is achieved.

[0016] (2) This invention achieves independent control of torsional and lateral vibration of the gear transmission system through different excitation units, avoiding mutual interference between vibration control algorithms coupled in different directions.

[0017] (3) The present invention adopts a magnetorheological fluid-electromagnetic combination drive method, which has the advantages of fast response speed, reversible control process, stable operation and uniform load, and can effectively suppress the transmission of torsional-lateral coupling excitation when the gear transmission system is working. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of the torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, according to an embodiment of the present invention.

[0019] Figure 2 This is a front sectional view of the torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, according to an embodiment of the present invention.

[0020] Figure 3 This is a left sectional view of the torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the torsional vibration control principle of the torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the transverse vibration control principle of the torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, according to an embodiment of the present invention.

[0023] Wherein: 1: Shaft body; 2: Gear body; 3: Mover; 4: Stator; 5: Magnetorheological fluid; 6: Torsional vibration isolation ring; 7: Lateral vibration isolation ring; 8: Torsional vibration excitation coil; 9: Lateral vibration excitation coil; 10: Rubber sealing ring; 11: Base. Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0025] Combination Figures 1-3 This invention introduces a torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, comprising a shaft body 1, a gear body 2, a mover 3, a stator 4, a magnetorheological fluid 5, a torsional vibration isolation ring 6, a lateral vibration isolation ring 7, a torsional vibration excitation coil 8, a lateral vibration excitation coil 9, a rubber sealing ring 10, and a base 11. The gear body 2 is connected to the shaft body 1, and the shaft body 1 and the mover 3 are centrally mounted and circumferentially fixed by a spline, with no relative rotation. The stator 4 is fixedly connected to the base 11 by threads. The mover 3 is located in the middle of the stator 4.

[0026] Magnetorheological fluid 5 is injected into the cavity between the stator 4 and the mover 3 and sealed with a rubber sealing ring 10. Two sets of torsional excitation coils 8, wound symmetrically about the mover 3 along the circumferential direction of the shaft, are arranged in the stator 4. The tangential torque of the magnetorheological fluid 5 is changed by adjusting the excitation current. A torsional vibration isolation ring 6 is arranged in the inner diameter direction of the winding of the torsional excitation coil 8 to prevent the magnetic lines of force from becoming too dense around the torsional excitation coil, ensuring that the magnetic lines of force pass fully through the magnetorheological fluid and improving the magnetic field utilization rate. Transverse excitation coils 9 are wound on the eight radial poles of the stator 4, with each pair of transverse excitation coils 9 forming a group symmetrical about the radial direction of the stator 4. The eight transverse excitation coils 9 form four electromagnets to adjust the position of the mover 3 in the horizontal and vertical directions in real time. A uniform air gap is provided between the pole of stator 4 and mover 3. The lateral constraint of the electromagnet on the mover is changed by adjusting the excitation current. The size of the air gap is dynamically set according to the required electromagnetic force. The transverse vibration magnetic isolation ring 7 is set between the walls of mover 3 and stator 4 to limit the range of action of the magnetic field generated by the transverse vibration excitation coil and avoid mutual interference with the magnetic field line loop generated by the torsional vibration excitation coil.

[0027] In this invention, the torsional torque and lateral electromagnetic driving force adopt a magnetorheological fluid-electromagnetic combined driving method. Compared with other driving methods such as piezoelectric and magnetostrictive, it has the characteristics of fast response speed, simple structure, stable working state, and reversible and controllable driving process. It can effectively suppress the transmission of torsional-lateral coupling vibration in the gear transmission system and achieve the goal of system vibration reduction and noise reduction.

[0028] Multiple signal detection devices are mounted on the base 11. In this embodiment, an incremental angle encoder is installed between the gear body 2 and the support bearing to measure the real-time rotational speed of the gear body 2. Displacement sensors are installed on the base 11 in both the horizontal and vertical directions, aligned with the shaft center, to measure the relative displacement of the mover 3 to the base 11 in the horizontal and vertical directions under electromagnetic drive, respectively. Figures 4-5 This device also includes two independent control systems. One control system is connected to an angle encoder, which feeds back the rotational speed of the gear body 2 to the control system in real time. The control system generates a control signal, which is amplified to change the current through the torsional excitation coil 8, thereby adjusting the torsional torque of the magnetorheological fluid 5 on the mover 3 and suppressing the torsional vibration transmission of the gear body 2 in real time. The other control system is connected to horizontally and vertically arranged displacement sensors, which feed back signals to the control system in real time. The control system uses differential mode to change the current of the transverse excitation coil 9, adjusts the electromagnetic force at the eight poles, and thus controls the transverse vibration transmission of the gear body 2 in real time.

[0029] A uniform air gap is left between the eight poles of the stator 4 and the mover 3 to generate a lateral electromagnetic driving force for the gear transmission system, thereby realizing the dynamic adjustment of the lateral position of the gear transmission system. The size of the air gap is determined according to the actual electromagnetic force required.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "horizontal", "vertical", etc., indicate the orientation and positional relationship based on the orientation and positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. The present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, without causing the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, comprising a base, a stator fixed to the base, a gear body connected to a shaft body, and a mover aligned with the shaft body; characterized in that, The mover is located in the middle of the stator. Magnetorheological fluid is injected into the cavity between the stator and the mover and then sealed. The stator is symmetrically arranged with respect to the mover with two sets of torsional excitation coils wound along the circumferential direction of the shaft. By adjusting the excitation current, the tangential torque of the magnetorheological fluid is changed, which is used to generate a dynamic damping torque opposite to the rotation direction of the shaft body. A torsional vibration isolation ring is provided in the inner diameter direction of the torsional vibration excitation coil winding to prevent the magnetic lines of force from being too dense around the torsional vibration excitation coil and to allow the magnetic lines of force to pass through the magnetorheological fluid fully. The stator is provided with multiple pairs of poles, and a uniform air gap is provided between the poles and the mover. Each pole is wound with a transverse vibration excitation coil, and each pair of transverse vibration excitation coils forms an electromagnet. By adjusting the excitation current, the transverse constraint of the electromagnet on the mover is changed, which is used to control the transverse vibration transmission of the gear body. A transverse vibration isolation ring is provided between the moving and stator walls to limit the range of the magnetic field generated by the transverse vibration excitation coil and avoid mutual interference with the magnetic field loop generated by the torsional vibration excitation coil.

2. The torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive according to claim 1, characterized in that, It also includes two independent control systems. One control system is connected to an angle encoder, which provides real-time feedback on the rotational speed of the gear body. This control system generates a control signal to change the current through the torsional excitation coil, thereby adjusting the torsional torque of the magnetorheological fluid on the mover and suppressing the torsional vibration transmission of the gear body in real time. The other control system is connected to a displacement sensor to measure the displacement of the mover relative to the base in the horizontal and vertical directions under electromagnetic drive. This other control system uses differential mode to change the current of the transverse excitation coil, adjust the electromagnetic force at multiple poles, and thus control the transverse vibration transmission of the gear body in real time.

3. The torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive according to claim 1, characterized in that, The stator has eight poles.

4. The torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive according to claim 2, characterized in that, The displacement sensors are in multiple sets, mounted on the base and aligned with the horizontal and vertical directions of the axis.

5. The torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive according to claim 1, characterized in that, The shaft body and the moving part are fixed by a spline.

6. The torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive according to claim 1, characterized in that, The magnetorheological fluid is sealed by a rubber sealing ring.

7. The torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive according to claim 1, characterized in that, The stator is fixedly connected to the base by threads.

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