Electromagnetic variable stiffness magneto-rheological resonant conversion vibration isolation system

Abstract

The present application belongs to the technical field of vibration control, and particularly relates to a kind of electromagnetic variable stiffness magneto-rheological resonance conversion vibration isolation systems.To solve the problems of traditional resonance converters, such as narrow filter band, inability to reduce multi-spectrum peak value and unsatisfactory low-frequency control effect, in the present 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 cavity piston is located in the rigid cavity and connected with the electromagnetic winding skeleton, the permanent magnet is embedded in the magnetic sleeve, the iron core is fixed in the center of the magnetic sleeve, the guide rod is fixedly connected with the rigid cavity piston and passes through the linear bearing fixed in the rigid cavity structure, the spiral spring is located outside the guide rod, and the feedback control system is used to adjust and control the current in the conduit unit excitation coil and electromagnetic winding 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] The application belongs to the technical field of vibration control, and particularly relates to an electromagnetic variable stiffness magneto-rheological resonant converter vibration isolation system. BACKGROUND

[0002] Since Goodwin proposed the resonant converter, it has been widely studied by domestic and foreign scholars. The device has been applied in real ships, and through actual measurement, it is shown that the device can effectively reduce the line spectrum vibration caused by the shafting longitudinal vibration.

[0003] The main problems and deficiencies of the existing resonant converter include:

[0004] The structure and parameters of the existing resonant converter are fixed, and the mechanical parameters such as equivalent mass, equivalent damping and equivalent stiffness cannot be adjusted in real time according to the actual working condition. There are problems such as narrow filter band, inability to reduce multiple line spectrum peaks, unsatisfactory low-frequency control effect and insufficient load adaptability.

[0005] In view of the technical requirement of adjustability of the dynamics parameters of the resonant converter, CN 112594282A discloses a resonant converter cavity structure with adjustable volume, which uses a hydraulic device to adjust the volume of the working cavity. The essence is to adjust the equivalent stiffness of the resonant converter. Due to the limitations of arrangement space, weight and energy consumption, the adjustment range of the stiffness is usually limited, which is difficult to meet the actual demand.

[0006] The magneto-rheological fluid material has excellent magnetic control characteristics and controllable damping magnetic field characteristics, and has great application potential in the field of vibration control. Unlike the traditional resonant converter which uses the bulk modulus of the fluid medium to provide stiffness and uncontrollable fluid viscosity, the application utilizes the controllable damping characteristics and electromagnetic variable stiffness capability of the magneto-rheological fluid material, adjusts the equivalent stiffness in the rigid cavity through the magnetic field controllable characteristics of the dynamic viscosity and bulk modulus of the magneto-rheological fluid, and the electromagnetic force between the electromagnetic winding and the permanent magnet, transforms the traditional resonant converter, and proposes an electromagnetic variable stiffness magneto-rheological resonant converter vibration isolation system, which widens the adjustment range of the equivalent damping and equivalent stiffness of the resonant converter vibration isolator. The technical scheme can not only be used for longitudinal vibration control of the ship propulsion shafting, but also be applied to the field of high-performance vibration and noise reduction of precision instruments, electric vehicle drive motor suspension and ship power machinery suspension. SUMMARY

[0007] In order to improve the problems of the traditional resonant converter such as narrow filter band, inability to reduce multiple line spectrum peaks and unsatisfactory low-frequency control effect, the application provides an electromagnetic variable stiffness magneto-rheological resonant converter vibration isolation system. The pulsation pressure of the magneto-rheological fluid in the resonant converter conduit and the rigid cavity is regulated by the feedback control system, so that the resonant converter vibration isolation system works in the tuning state, and the vibration isolation effect achieved by the design is maximized.

[0008] In order to achieve the above object, the present application adopts the following technical solutions:

[0009] The electromagnetic variable stiffness magneto-rheological resonant conversion vibration isolation system comprises a hydraulic cylinder, a hydraulic cylinder piston, a conduit, a conduit unit excitation coil, a rigid cavity, a rigid cavity piston, a guide rod, a spiral spring, a linear bearing, a permanent magnet, an electromagnetic winding, an electromagnetic winding skeleton, a magnetic conducting sleeve, an iron core and a feedback control system.

[0010] The hydraulic cylinder piston is located in the hydraulic cylinder and connected with the object to be isolated through a piston rod, the hydraulic cylinder and the rigid cavity are connected through the conduit, the conduit unit excitation coil is arranged outside the conduit, the rigid cavity piston is located in the rigid cavity, the magnetic conducting sleeve is fixed to the inner wall of the rigid cavity, the permanent magnet is arranged on the inner wall of the magnetic conducting sleeve, the iron core is fixed to the center of the magnetic conducting sleeve, the electromagnetic winding skeleton is located in the magnetic conducting sleeve and fixed to one side of the rigid cavity piston at one end and located between the permanent magnet and the iron core, the electromagnetic winding is arranged on the electromagnetic winding skeleton, the guide rod is fixedly connected with one side of the rigid cavity piston and passes through the linear bearing fixed to the rigid cavity, the spiral spring is sleeved outside the guide rod, the object to be isolated is provided with a vibration sensor, the output end of the vibration sensor is connected with the input end of the feedback control system, the output end of the feedback control system is connected with the conduit unit excitation coil and the electromagnetic winding through wires respectively, and the hydraulic cylinder, the conduit and the rigid cavity are filled with magneto-rheological fluid.

[0011] Further, the feedback control system comprises a controller and a power amplifier, the output end of the vibration sensor is connected with the controller and the power amplifier in sequence, and the output end of the power amplifier is connected with the conduit unit excitation coil and the electromagnetic winding through wires respectively.

[0012] Further, the conduit unit excitation coil and the electromagnetic winding are arranged as a plurality of coils.

[0013] Further, the spiral spring, the guide rod and the linear bearing are arranged as two or more groups of symmetrical circumferential distribution in the rigid cavity.

[0014] Further, the control strategy of the feedback control system is continuous or discrete control strategy.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] (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 dynamic viscosity, bulk modulus and electromagnetic stiffness of the magnetorheological fluid 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 converter 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.

[0017] (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

[0018] Figure 1 This is a schematic diagram of the electromagnetic variable stiffness magnetorheological resonance conversion vibration isolation system of the present invention. In the diagram, 1 is a conductor, 2 is a helical spring, 3 is a linear bearing, 4 is a guide rod, 5 is an electromagnetic winding, 6 is an iron core, 7 is an electromagnetic winding frame, 8 is a permanent magnet, 9 is a magnetic sleeve, 10 is a rigid cavity, 11 is a rigid cavity piston, 12 is a conduit unit excitation coil, 13 is a hydraulic cylinder, 14 is a magnetorheological fluid, 15 is a hydraulic cylinder piston, 16 is a piston rod, 17 is a conduit, 18 is a vibration sensor, 19 is a controller, and 20 is a power amplifier. Detailed Implementation

[0019] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0020] like Figure 1 As shown, an electromagnetic variable stiffness magnetorheological resonance conversion vibration isolation system of this embodiment includes a hydraulic cylinder 13, a hydraulic cylinder piston 15, a conduit 17, a conduit unit excitation coil 12, a rigid cavity 10, a rigid cavity piston 11, a guide rod 4, a helical spring 2, a linear bearing 3, a permanent magnet 8, an electromagnetic winding 5, an electromagnetic winding frame 7, a magnetic sleeve 9, an iron core 6, and a feedback control system.

[0021] The hydraulic cylinder piston 15 is located in the hydraulic cylinder 13 and connected to the vibration-isolated object via the piston rod 16. The hydraulic cylinder 13 and the rigid cavity 10 are connected via a conduit 17. The excitation coil 12 of the conduit unit is located outside the conduit 17. The rigid cavity piston 11 is located inside the rigid cavity 10. The magnetic sleeve 9 is fixed to the inner wall of the rigid cavity 10. A permanent magnet 8 is provided on the inner wall of the magnetic sleeve 9. The iron core 6 is fixed to the center of the magnetic sleeve 9. The electromagnetic winding frame 7 is located inside the magnetic sleeve 9 and one end is fixed to one side of the rigid cavity piston 11, and is located between the permanent magnet 8 and the iron core 6. Between the cores 6, the electromagnetic winding 5 is mounted on the electromagnetic winding frame 7. The guide rod 4 is fixedly connected to one side of the rigid cavity piston 11 and passes through the linear bearing 3 fixed on the rigid cavity 10. The helical spring 2 is sleeved on the guide rod 4. A vibration sensor 18 is mounted on the object being isolated. The output end of the vibration sensor 18 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 12 of the conduit unit and the electromagnetic winding 5 through wires 1. The hydraulic cylinder 13, the conduit 13, and the rigid cavity 10 are filled with magnetorheological fluid 14. The excitation coil 12 of the conduit unit, the conduit 17, and the magnetorheological fluid 14 inside the conduit constitute the working magnetic circuit of the conduit unit. The hydraulic cylinder 13, the hydraulic cylinder piston 15, the conduit 17, the excitation coil 12 of the conduit unit, the rigid cavity 10, the rigid cavity piston 11, the magnetorheological fluid 14, the electromagnetic winding 5, and the permanent magnet 8 constitute a semi-active resonance converter. The feedback control system is used to adjust the current in the excitation coil 12 and electromagnetic winding 5 of the duct unit according to the vibration state of the vibration isolation system to change the equivalent damping and equivalent stiffness of the resonant converter.

[0022] The feedback control system includes a controller 19 and a power amplifier 20. The output of the vibration sensor 18 is connected to the controller 19 and the power amplifier 20 in sequence. The output of the power amplifier 20 is connected to the excitation coil 12 and the electromagnetic winding 5 of the conduit unit via wires 1. The feedback control system transforms the vibration signal measured by the vibration sensor 19 according to the designed optimal control strategy (i.e., the controller 19), and then controls the magnetic field inside the conduit 17 and the electromagnetic force between the electromagnetic winding 5 and the permanent magnet 8 via the power amplifier 20, thereby controlling the dynamic viscosity and bulk modulus of the magnetorheological fluid as well as the stiffness within the rigid cavity.

[0023] Vibration sensors are selected based on 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.

[0024] The control strategy of the feedback control system can be designed as a continuous control strategy, such as PID, LQR control, sliding mode control and 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 a certain switching rule.

[0025] As a further improvement of the embodiment, the conduit unit excitation coil and the electromagnetic winding can be designed as multiple coils or other forms.

[0026] As a further improvement of the embodiment, the fixed stiffness module composed of the spiral spring, the guide rod and the linear bearing can be set as two groups or more groups symmetrically distributed in the circumferential direction in the rigid cavity according to the actual working conditions.

[0027] The main features and advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0028] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An electromagnetically variable stiffness magnetorheological resonant transduction vibration isolation system, characterized in that, The hydraulic cylinder, the hydraulic cylinder piston, the conduit, the conduit unit excitation coil, the rigid cavity, the rigid cavity piston, the guide rod, the helical spring, the linear bearing, the permanent magnet, the electromagnetic winding, the electromagnetic winding skeleton, the magnetic conductive sleeve, the core and the feedback control system are included. The hydraulic cylinder piston is located in the hydraulic cylinder and connected with the object to be isolated by the piston rod, the hydraulic cylinder and the rigid cavity are connected by the conduit, the conduit unit excitation coil is arranged outside the conduit, the rigid cavity piston is located in the rigid cavity, the magnetic conductive sleeve is fixed to the inner wall of the rigid cavity, the inner wall of the magnetic conductive sleeve is provided with the permanent magnet, the core is fixed to the center of the magnetic conductive sleeve, the electromagnetic winding skeleton is located in the magnetic conductive sleeve and fixed to one side of the rigid cavity piston, and located between the permanent magnet and the core, the electromagnetic winding is arranged on the electromagnetic winding skeleton, the guide rod is fixedly connected with one side of the rigid cavity piston and passes through the linear bearing fixed to the rigid cavity, the helical spring is sleeved outside the guide rod, the object to be isolated is provided with the vibration sensor, the output end of the vibration sensor is connected with the input end of the feedback control system, the output end of the feedback control system is connected with the conduit unit excitation coil and the electromagnetic winding through wires respectively, and the hydraulic cylinder, the conduit and the rigid cavity are filled with the magnetorheological fluid.

2. The electromagnetic variable stiffness magnetorheological resonant conversion vibration isolation system according to claim 1, characterized in that, The feedback control system includes a controller and a power amplifier, the output end of the vibration sensor is connected with the controller and the power amplifier in sequence, and the output end of the power amplifier is connected with the conduit unit excitation coil and the electromagnetic winding through wires respectively.

3. The electromagnetic variable stiffness magnetorheological resonant conversion vibration isolation system according to claim 1, wherein, The conduit unit excitation coil and the electromagnetic winding are arranged as multiple coils.

4. The electromagnetically variable stiffness magnetorheological resonant transduction vibration isolation system of claim 1, wherein, The helical spring, the guide rod and the linear bearing are arranged as multiple groups of symmetrical circumferential distribution in the rigid cavity.

5. The electromagnetic variable-stiffness MRF resonant transduction vibration isolation system according to claim 1, wherein, The control strategy of the feedback control system is continuous or discrete control strategy.

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