A tuned magneto rheological resonant transducer vibration isolation system

Abstract

The present application belongs to the technical field of vibration control, and particularly relates to a tuned magneto-rheological resonant conversion vibration isolation system. In order to solve the problems of narrow filter band, inability to reduce multi-line spectrum peak value and unsatisfactory low-frequency control effect of the traditional resonant converter, in the present application, the hydraulic cylinder piston is located in the hydraulic cylinder and connected with the object to be isolated through the piston rod, the hydraulic cylinder and the rigid cavity are connected through the guide pipe, the guide pipe unit excitation coil is arranged outside the guide pipe, the rigid cavity piston is located in the rigid cavity, the guide rod is fixedly connected with one side of the rigid cavity piston and passes through the linear bearing fixed on the rigid cavity, the spiral spring is sleeved outside the guide rod, the left and right ends of the tuning spring and the voice coil motor are respectively connected with one side of the rigid cavity piston and the mass block, the object to be isolated is provided with a vibration sensor, the vibration sensor is connected with a feedback control system, the feedback control system is connected with the guide pipe unit excitation coil and the mass block through wires, and the system is filled with magneto-rheological fluid.

Description

Technical Field

[0001] This invention belongs to the field of vibration control technology, specifically relating to a tuned magnetorheological resonance conversion vibration isolation system. Background Technology

[0002] Since Goodwin proposed the resonance converter, it has been extensively studied by scholars at home and abroad. The device has been applied in actual ships, and field measurements have shown that it can effectively reduce the line spectrum vibration caused by the longitudinal vibration of the shaft system.

[0003] The main problems and shortcomings of existing resonant converters include:

[0004] Existing resonant converters have fixed structures and parameters, making it impossible to adjust mechanical parameters such as equivalent mass, equivalent damping, and equivalent stiffness in real time according to actual working conditions. This results in problems such as narrow filtering bandwidth, inability to reduce multi-line spectrum peaks, unsatisfactory low-frequency control effect, and insufficient load adaptability.

[0005] To address the technical requirement for adjustable dynamic parameters of resonant converters, CN 112594282 A discloses an adjustable resonant converter cavity structure. This structure utilizes a hydraulic device to adjust the volume of the working cavity, essentially achieving equivalent stiffness adjustment of the resonant converter. However, due to limitations in layout space, weight, and energy consumption, the stiffness adjustment range is typically limited, making it difficult to meet practical needs.

[0006] Magnetorheological fluids possess excellent magnetic control properties and controllable damping magnetic fields, making them highly promising for vibration control. Unlike traditional resonant transducers that rely on the bulk modulus of the fluid medium for stiffness and have uncontrollable viscosity, this invention utilizes the dynamic viscosity and controllable magnetic field characteristics of the bulk modulus of magnetorheological fluids to achieve variable damping control of the transducer. Furthermore, by constructing a mass tuning module within a rigid cavity using piston and spring support structures, the equivalent mass of the transducer can be adjusted. This leads to a tuned magnetorheological resonant transducer vibration isolation system, broadening the adjustment range of equivalent damping and equivalent mass in transducer vibration isolation systems. This technical solution can be applied not only to longitudinal vibration control of ship propulsion shaft systems but also to high-performance vibration reduction and noise reduction applications in precision instruments, electric vehicle drive motor mounts, and marine power machinery mounts. Summary of the Invention

[0007] To effectively address the challenges of traditional resonant converters, such as narrow filtering bandwidth, inability to reduce multi-line spectrum peaks, and unsatisfactory low-frequency control, this invention provides a tuned magnetorheological resonant converter vibration isolation system. This system uses a feedback control system to regulate the pulsating pressure of the magnetorheological fluid within the resonant converter conduit and rigid cavity, ensuring the system operates in a tuned state to maximize the designed vibration isolation effect.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] A tuned magnetorheological resonance conversion vibration isolation system includes a hydraulic cylinder, a hydraulic cylinder piston, a guide tube, a guide tube unit excitation coil, a rigid cavity, a rigid cavity piston, a guide rod, a helical spring, a linear bearing, a mass block, a tuning spring, a voice coil motor, and a feedback control system.

[0010] The hydraulic cylinder piston is located in the hydraulic cylinder and connected to the vibration-isolated object through the piston rod. The hydraulic cylinder and the rigid cavity are connected through a conduit. The excitation coil of the conduit unit is set outside the conduit. The rigid cavity piston is located inside the rigid cavity. The guide rod is fixedly connected to one side of the rigid cavity piston and passes through a linear bearing fixed on the rigid cavity. The helical spring is sleeved outside the guide rod. The left and right ends of the tuning spring and the voice coil motor are respectively connected to the mass block and one side of the rigid cavity piston. A vibration sensor is installed on the vibration-isolated object. The output end of the vibration sensor is connected to the input end of the feedback control system. The output end of the feedback control system is connected to the excitation coil of the conduit unit and the voice coil motor through wires. The hydraulic cylinder, the conduit, and the rigid cavity are filled with magnetorheological fluid.

[0011] Furthermore, the feedback control system includes a controller and a power amplifier. The output terminal of the vibration sensor is connected to the controller and the power amplifier in sequence. The output terminal of the power amplifier is connected to the excitation coil of the duct unit and the voice coil motor respectively through wires.

[0012] Furthermore, the excitation coil of the conduit unit is configured as multiple coils.

[0013] Furthermore, the voice coil motor can be replaced with other actuators.

[0014] Furthermore, the tuning spring is implemented using an equivalent spring with linear or nonlinear stiffness characteristics.

[0015] Furthermore, the helical spring, guide rod, and linear bearing are configured as two or more sets symmetrically distributed circumferentially within the rigid cavity.

[0016] Furthermore, the control strategy of the feedback control system is either a continuous or discrete control strategy.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention uses magnetorheological fluid as the fluid medium of a resonant converter, which differs from traditional resonant converters using hydraulic oil. It utilizes the controllable dynamic viscosity and bulk modulus of magnetorheological fluid under the action of a magnetic field, as well as dynamic tuning, combined with semi-active vibration control technology, to broaden the adjustable range of equivalent damping and equivalent mass of the resonant converter. This ensures that the resonant converter vibration isolation system operates in a tuned state, effectively improving the problems of narrow filtering bandwidth, inability to reduce multi-line spectrum peaks, and unsatisfactory low-frequency control effects of traditional resonant converters, so as to maximize the vibration isolation effect achieved by the design.

[0019] This invention has the advantages of simultaneous adjustment of equivalent damping and equivalent mass, simple structure, strong adaptability, high reliability and low energy consumption. It is suitable for broadband, multi-line spectrum and variable load vibration isolation in high-performance vibration reduction and noise reduction fields such as ship propulsion shafting, precision instruments, electric vehicle drive motor mounts and marine power machinery mounts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the tuned magnetorheological resonance conversion vibration isolation system in this embodiment, wherein: 1 is a wire, 2 is a helical spring, 3 is a linear bearing, 4 is a guide rod, 5 is a tuning spring, 6 is a voice coil motor, 7 is a mass block, 8 is a rigid cavity piston, 9 is a rigid cavity, 10 is a conduit unit excitation coil, 11 is a hydraulic cylinder, 12 is a magnetorheological fluid, 13 is a hydraulic cylinder piston, 14 is a piston rod, 15 is a conduit, 16 is a vibration sensor, 17 is a controller, and 18 is a power amplifier. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The specific embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0022] like Figure 1 As shown, a harmonic rheodynamic resonance conversion vibration isolation system of this embodiment includes a hydraulic cylinder 11, a hydraulic cylinder piston 13, a conduit 15, a conduit unit excitation coil 10, a rigid cavity 9, a rigid cavity piston 8, a guide rod 4, a helical spring 2, a linear bearing 3, a mass block 7, a tuning spring 5, a voice coil motor 6, and a feedback control system.

[0023] The hydraulic cylinder piston 13 is located in the hydraulic cylinder 11 and connected to the vibration-isolated object through the piston rod 14. The hydraulic cylinder 11 and the rigid cavity 9 are connected through the conduit 15. The excitation coil 10 of the conduit unit is set outside the conduit 15. The rigid cavity piston 8 is located inside the rigid cavity 9. The guide rod 4 is fixedly connected to one side of the rigid cavity piston 8 and passes through the linear bearing 3 fixed on the rigid cavity 9. The helical spring 2 is sleeved outside the guide rod 4. The left and right ends of the tuning spring 5 and the voice coil motor 6 are respectively connected to the mass block 7 and one side of the rigid cavity piston 8. The vibration-isolated object is equipped with a vibration sensor 16. The output end of the vibration sensor 16 is connected to the input end of the feedback control system. The output end of the feedback control system is connected to the excitation coil 10 of the conduit unit and the voice coil motor 6 through the wire 1. The hydraulic cylinder 11, the conduit 15 and the rigid cavity 9 are filled with magnetorheological fluid 12. The feedback control system is used to adjust the current in the excitation coil 10 of the duct unit and the voice coil motor 6 according to the vibration state of the vibration isolation system, so as to change the equivalent damping and equivalent mass of the resonant converter.

[0024] The feedback control system includes a controller 17 and a power amplifier 18. The output of the vibration sensor 16 is connected to the controller 17 and the power amplifier 18 in sequence. The output of the power amplifier 18 is connected to the excitation coil 10 of the duct unit and the voice coil motor 6 via wires 1. The feedback control system transforms the vibration signal measured by the vibration sensor 16 according to the designed optimal control strategy, and then controls the magnetic field inside the duct 15 and the current in the voice coil motor 6 via the power amplifier 18, thereby realizing the equivalent damping and equivalent mass adjustment of the semi-active resonant converter.

[0025] The control strategy of a feedback control system can be designed as a continuous control strategy, such as PID, LQR control, sliding mode control, fuzzy control, neural network control, reinforcement learning and other intelligent control algorithms; or a discrete control strategy can be selected, such as an improved Bang-Bang control algorithm designed according to certain switching rules.

[0026] The vibration sensor 16 is selected according to the specific vibration isolation system, such as measuring the acceleration / displacement of the object being isolated, the acceleration / displacement of the foundation, and the relative displacement between the object being isolated and the foundation.

[0027] The excitation coil 10 of the duct unit can be configured as multiple coils, the voice coil motor 6 can be replaced by other actuators, the tuning spring 5 is realized by an equivalent spring with linear or nonlinear stiffness characteristics, and the helical spring 2, guide rod 4 and linear bearing 3 are configured as two or more sets symmetrically distributed circumferentially in the rigid cavity 9.

[0028] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tuned magneto-rheological resonant transduction vibration isolation system, characterized by, It includes a hydraulic cylinder, a hydraulic cylinder piston, a guide tube, a guide tube unit excitation coil, a rigid cavity, a rigid cavity piston, a guide rod, a helical spring, a linear bearing, a mass block, a tuning spring, a voice coil motor, and a feedback control system; The hydraulic cylinder piston is located in the hydraulic cylinder and connected to the vibration-isolated object via the piston rod. The hydraulic cylinder and the rigid cavity are connected via a conduit. The excitation coil of the conduit unit is located outside the conduit. The rigid cavity piston is located inside the rigid cavity. The guide rod is fixedly connected to one side of the rigid cavity piston and passes through a linear bearing fixed on the rigid cavity. The helical spring is sleeved outside the guide rod. The left and right ends of the tuning spring are respectively connected to one side of the rigid cavity piston and the mass block. The left and right ends of the voice coil motor are respectively connected to one side of the rigid cavity piston and the mass block. A vibration sensor is installed on the vibration-isolated object. The output end of the vibration sensor is connected to the input end of the feedback control system. The output end of the feedback control system is connected to the excitation coil of the conduit unit and the voice coil motor via wires. The hydraulic cylinder, conduit, and rigid cavity are filled with magnetorheological fluid.

2. The tuned magneto rheological resonant transducer vibration isolation system of claim 1, wherein, The feedback control system includes a controller and a power amplifier. The output terminal of the vibration sensor is connected to the controller and the power amplifier in sequence. The output terminal of the power amplifier is connected to the excitation coil of the duct unit and the voice coil motor respectively through wires.

3. The tuned magneto rheological resonant transducer vibration isolation system of claim 1, wherein, The excitation coil of the conduit unit is configured as multiple coils.

4. The tuned magneto rheological resonant transducer vibration isolation system of claim 1, wherein, The tuning spring is implemented using an equivalent spring with linear or nonlinear stiffness characteristics.

5. The tuned magneto rheological resonant transducer vibration isolation system of claim 1, wherein, The helical spring, guide rod, and linear bearing are arranged in multiple sets symmetrically circumferentially distributed within the rigid cavity.

6. The tuned magneto rheological resonant transducer vibration isolation system of claim 1, wherein, The control strategy of the feedback control system can be either a continuous or discrete control strategy.

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