Resonant conversion based magneto-rheological fluid-magneto-rheological elastomer composite vibration isolation system

Abstract

The application belongs to the technical field of vibration control and specifically relates to a magneto-rheological fluid-magneto-rheological elastomer composite vibration isolation system based on resonance conversion. In order to solve the problems of narrow filter band, inability to reduce multiple spectral peak values and unsatisfactory low-frequency control effect of the traditional resonance converter, in the application, the conduit unit excitation coil, conduit and magneto-rheological fluid in the conduit constitute the working magnetic circuit of the conduit unit, the rigid container cavity piston is located in the rigid container cavity and connected with the magneto-rheological elastomer unit, the magneto-rheological elastomer unit excitation coil provides a controllable magnetic field for the magneto-rheological elastomer, the hydraulic cylinder, conduit and rigid container cavity are filled with the magneto-rheological fluid, and the feedback control system is used for adjusting the current in the conduit unit excitation coil and the magneto-rheological elastomer unit excitation coil according to the vibration state of the vibration isolation system to change the equivalent damping and equivalent stiffness of the resonance converter.

Description

Technical Field

[0001] This invention belongs to the field of vibration control technology, specifically relating to a composite vibration isolation system based on resonance conversion of magnetorheological fluid and magnetorheological elastomer. 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 112594282A discloses an adjustable resonant converter cavity structure. This structure utilizes a hydraulic device to adjust the volume of the working cavity, essentially achieving adjustment of the equivalent stiffness of the resonant converter. However, due to limitations in layout space, weight, and energy consumption, the range of stiffness adjustment is typically limited, making it difficult to meet practical needs.

[0006] Magnetorheological fluids and magnetorheological elastomers (MEAs) possess excellent magnetic control properties, exhibiting controllable damping and stiffness magnetic fields, respectively, and hold immense application potential in vibration control. Unlike traditional resonant transducers that utilize the bulk modulus of the fluid medium to provide stiffness and suffer from uncontrollable fluid viscosity, this invention modifies traditional resonant transducers by leveraging the controllable damping properties of magnetorheological fluids and the controllable stiffness properties of magnetorheological elastomers. It proposes a magnetorheological fluid-mesh elastomer composite vibration isolation system based on resonant transduction, broadening the adjustment range of equivalent damping and equivalent stiffness of the resonant transducer isolator. 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 such as precision instruments, electric vehicle drive motor mounts, and marine power machinery mounts. Summary of the Invention

[0007] To 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 magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonant conversion. The 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 resonant conversion vibration isolation 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 magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion includes a hydraulic cylinder, a hydraulic cylinder piston, a conduit, a conduit unit excitation coil, a rigid cavity, a rigid cavity piston, an inner magnetic sleeve, an outer magnetic sleeve, a magnetorheological elastomer, a magnetorheological elastomer unit excitation coil, and a feedback control system.

[0010] 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 piston of the rigid cavity is located inside the rigid cavity. The outer magnetic sleeve is located on the inner wall of the rigid cavity. The inner magnetic sleeve is located inside the outer magnetic sleeve. The excitation coil of the magnetorheological elastomer unit is located between the outer magnetic sleeve and the inner magnetic sleeve. The magnetorheological elastomer is located inside the inner magnetic sleeve and is connected to the rigid cavity piston via a connecting rod. 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 excitation coil of the magnetorheological elastomer unit via wires. The hydraulic cylinder, the conduit, and the rigid cavity are filled with magnetorheological fluid.

[0011] Furthermore, a magnetorheological elastomer upper pressure plate is provided on one side of the magnetorheological elastomer. The magnetorheological elastomer upper pressure plate is located inside the outer magnetic sleeve, and a through hole is provided in the middle of the magnetorheological elastomer upper pressure plate for the connecting rod to pass through.

[0012] Furthermore, the feedback control system includes a controller and a current driver. The output terminal of the vibration sensor is connected to the controller and the current driver in sequence. The output terminal of the current driver is connected to the excitation coil of the duct unit and the excitation coil of the magnetorheological elastomer unit through wires respectively.

[0013] Furthermore, the control current in the excitation coil of the conduit unit and the excitation coil of the magnetorheological elastomer unit may be in the same control channel or in different control channels.

[0014] Furthermore, the excitation coil of the duct unit and the excitation coil of the magnetorheological elastomer unit are configured as multiple coils.

[0015] Furthermore, the control strategy of the feedback control system is either a continuous control strategy or a discrete control strategy.

[0016] Furthermore, the rigid cavity can be cylindrical, spherical, or other shapes.

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

[0018] (1) This invention uses magnetorheological fluid as the fluid medium of the resonant converter, which is different from the traditional resonant converter using hydraulic oil. It utilizes the controllable characteristics of the dynamic viscosity, bulk modulus and stiffness of the magnetorheological elastomer under the action of a magnetic field, combined with vibration semi-active control technology, to broaden the adjustable range of equivalent damping and equivalent stiffness of the resonant converter, ensuring that the resonant conversion vibration isolation system works in a tuned state. This effectively improves the problems of narrow filtering bandwidth, inability to reduce multi-line spectrum peaks and unsatisfactory low-frequency control effect of traditional resonant converters, so as to maximize the vibration isolation effect achieved by the design.

[0019] (2) The present invention has the advantages of simultaneous adjustment of equivalent damping and equivalent stiffness, simple structure, strong adaptability, high reliability and low energy consumption. It is suitable for wideband, multi-line spectrum and variable load vibration isolation in high-performance vibration reduction and noise reduction fields such as ship propulsion shaft system, precision instrument, electric vehicle drive motor mount and marine power machinery mount. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the results of the magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion in this embodiment. Wherein: 1 is a conductor, 2 is the upper pressure plate of the magnetorheological elastomer, 3 is the inner magnetic sleeve, 4 is the magnetorheological elastomer, 5 is the excitation coil of the magnetorheological elastomer unit, 6 is the outer magnetic sleeve, 7 is the rigid cavity piston, 8 is the rigid cavity, 9 is the excitation coil of the conduit unit, 10 is the hydraulic cylinder, 11 is the magnetorheological fluid, 12 is the hydraulic cylinder piston, 13 is the piston rod, 14 is the conduit, 15 is the vibration sensor, 16 is the controller, and 17 is the current driver. 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, this embodiment of a magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion includes a hydraulic cylinder 10, a hydraulic cylinder piston 12, a conduit 14, a conduit unit excitation coil 9, a rigid cavity 8, a rigid cavity piston 7, an inner magnetic sleeve 3, an outer magnetic sleeve 6, a magnetorheological elastomer 4, a magnetorheological elastomer unit excitation coil 5, and a feedback control system.

[0023] The hydraulic cylinder piston 12 is located in the hydraulic cylinder 10 and connected to the vibration-isolated object via the piston rod 13. The hydraulic cylinder 10 and the rigid cavity 8 are connected via a conduit 14. The conduit unit excitation coil 9 is located outside the conduit 14. The rigid cavity piston 7 is located inside the rigid cavity 8. The outer magnetic sleeve 6 is located on the inner wall of the rigid cavity 8. The inner magnetic sleeve 3 is located inside the outer magnetic sleeve 6. The magnetorheological elastomer unit excitation coil 5 is located between the outer magnetic sleeve 6 and the inner magnetic sleeve 3. The magnetorheological elastomer 4 is located inside the inner magnetic sleeve 3, and the magnetorheological elastomer 4 is connected to the rigid cavity 8 via a connecting rod. The cavity piston 7 is connected, and a vibration sensor 15 is provided on the vibration-isolated object. The output end of the vibration sensor 15 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 9 of the conduit unit and the excitation coil 5 of the magnetorheological elastomer unit through wires 1 respectively. The hydraulic cylinder 10, the conduit 14 and the rigid cavity 8 are filled with magnetorheological fluid 11. A magnetorheological elastomer upper pressure plate 2 is provided on one side of the magnetorheological elastomer 4. The magnetorheological elastomer upper pressure plate 2 is located inside the outer magnetic sleeve 6, and a through hole is provided in the middle of the magnetorheological elastomer upper pressure plate 2 for the connecting rod to pass through. The hydraulic cylinder 10, hydraulic cylinder piston 12, conduit 14, conduit unit excitation coil 9, rigid cavity 8, rigid cavity piston 7, magnetorheological fluid 11, magnetorheological elastomer 4, and magnetorheological elastomer unit excitation coil 5 constitute a semi-active resonance converter. The feedback control system is used to adjust the current in the conduit unit excitation coil 9 and the magnetorheological elastomer unit excitation coil 5 according to the vibration state of the vibration isolation system to change the equivalent damping and equivalent stiffness of the resonance converter.

[0024] The feedback control system includes a controller 16 and a current driver 17. The vibration signal tested by the vibration sensor 15 is transformed and processed according to the designed optimal control strategy. The output terminal of the vibration sensor 15 is connected to the controller 16 and the current driver 17 in sequence. The output terminal of the current driver 17 is connected to the excitation coil 9 of the duct unit and the excitation coil 5 of the magnetorheological elastomer unit through the wire 1 respectively.

[0025] The control strategy of the feedback control system can be designed as a continuous control strategy, such as PID, LQR control, adaptive 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 control current in the excitation coil 9 of the conduit unit and the excitation coil 5 of the magnetorheological elastomer unit is controlled through the same control channel or through different control channels. The excitation coil 9 of the conduit unit and the excitation coil 5 of the magnetorheological elastomer unit are configured as multiple coils or other forms.

[0027] The rigid cavity 8 can be cylindrical, spherical, or other shapes.

[0028] The structure of the magnetorheological elastomer vibration isolation system can be modified to a shear mode or other forms.

[0029] The vibration sensor 15 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.

[0030] 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.

[0031] 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 magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion, characterized in that, 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, an inner magnetic sleeve, an outer magnetic sleeve, a magnetorheological elastomer, a magnetorheological elastomer unit excitation coil, 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 piston of the rigid cavity is located inside the rigid cavity. The outer magnetic sleeve is located on the inner wall of the rigid cavity. The inner magnetic sleeve is located inside the outer magnetic sleeve. The excitation coil of the magnetorheological elastomer unit is located between the outer magnetic sleeve and the inner magnetic sleeve. The magnetorheological elastomer is located inside the inner magnetic sleeve and is connected to the rigid cavity piston via a connecting rod. 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 excitation coil of the magnetorheological elastomer unit via wires. The hydraulic cylinder, the conduit, and the rigid cavity are filled with magnetorheological fluid.

2. The magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion according to claim 1, characterized in that, A magnetorheological elastomer upper pressure plate is provided on one side of the magnetorheological elastomer. The magnetorheological elastomer upper pressure plate is located inside the outer magnetic sleeve, and a through hole is provided in the middle of the magnetorheological elastomer upper pressure plate for the connecting rod to pass through.

3. The magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion according to claim 1, characterized in that, The feedback control system includes a controller and a current driver. The output terminal of the vibration sensor is connected to the controller and the current driver in sequence. The output terminal of the current driver is connected to the excitation coil of the duct unit and the excitation coil of the magnetorheological elastomer unit through wires.

4. The magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion according to claim 1, characterized in that, The control current in the excitation coil of the conduit unit and the excitation coil of the magnetorheological elastomer unit may be in the same control channel or in different control channels.

5. The magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion according to claim 1, characterized in that, The excitation coil of the duct unit and the excitation coil of the magnetorheological elastomer unit are configured as multiple coils.

6. The magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion according to claim 1, characterized in that, The control strategy of the feedback control system can be either a continuous control strategy or a discrete control strategy.

7. The magnetorheological fluid-magnetorheological elastomer composite vibration isolation system based on resonance conversion according to claim 1, characterized in that, The rigid cavity is cylindrical or spherical in shape.

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