Magnetic friction damper and control method thereof

Abstract

The present invention provides a magnetically controlled friction damper and a control method thereof. The magnetically controlled friction damper includes: a damper body, a controller, a sensor, and a coil; the sensor is arranged on the structure to be damped to collect the vibration signal of the structure to be damped; the damper body includes a fixed component and a movable component, the movable component is connected to the fixed component, and the movable component can move relative to the fixed component; the coil is arranged on the movable component or the fixed component; the controller is used to obtain the vibration signal and adjust the current on the coil based on at least the vibration signal to change the damping effect between the fixed component and the movable component. The magnetically controlled friction damper has a relatively stable and reliable vibration reduction effect, which can improve the stability and safety of the structure to be damped.

Description

Technical Field

[0001] The present invention relates to the technical field of dampers, and more particularly to a magnetically controlled friction damper and a control method thereof. Background Art

[0002] Friction dampers, as effective structural vibration isolation and reduction devices, are widely used in a variety of fields, including building structures, mechanical equipment, and piping systems. Friction dampers typically dissipate energy through the friction generated between fixed and movable parts. Their hysteresis curve is nearly rectangular, and their performance is stable and reliable. Friction dampers operate based on the friction between solid materials. When a structure vibrates due to external excitation (such as earthquakes or wind loads), relative motion occurs between the fixed and movable parts of the damper. At this point, the frictional surfaces between the two generate friction, which is proportional to the relative velocity. This friction converts the vibration energy into heat and dissipates it, thereby achieving the purpose of vibration reduction.

[0003] In related technologies, the friction force of the friction damper itself is usually uncontrollable. This uncontrollable friction force makes the vibration reduction effect of the friction damper unstable and the structural response unpredictable, affecting the application effect of the friction damper. Summary of the Invention

[0004] The present invention is proposed in view of the above problems. According to one aspect of the present invention, a magnetically controlled friction damper is provided, comprising: a damper body, a controller, a sensor, and a coil; the sensor is arranged on a structure to be damped to collect a vibration signal of the structure to be damped; the damper body comprises a fixed component and a movable component, the movable component is connected to the fixed component, and the movable component can move relative to the fixed component; the coil is arranged on the movable component or the fixed component; the controller is used to obtain the vibration signal and adjust the current on the coil based on at least the vibration signal to change the damping effect between the fixed component and the movable component.

[0005] Exemplarily, the fixed component includes two friction pressure plates parallel to each other, and a first friction plate is fixed on the inner side of each friction pressure plate; the movable component includes a magnetic conductive component, which is located between the two friction pressure plates, and the outer side of the magnetic conductive component is in contact with the first friction plate; the coil is arranged on the magnetic conductive component.

[0006] Exemplarily, the magnetic conductive component includes a magnetic conductive plate, the number of which is one, and the two sides of the magnetic conductive plate are respectively in contact with the two first friction plates; the coil is wound on the magnetic conductive plate; or, the magnetic conductive component includes two magnetic conductive plates parallel to each other, the two magnetic conductive plates are respectively in contact with the two first friction plates, the number of coils is two, and the two coils are respectively wound on the two magnetic conductive plates; the fixed component also includes a second friction plate, the second friction plate is located between the two magnetic conductive plates and the two sides of the second friction plate are respectively in contact with the two magnetic conductive plates.

[0007] Exemplarily, the fixed component includes two parallel friction pressure plates and an intermediate plate, and a first friction plate is fixed on the inner side of the two friction pressure plates; the movable component includes two parallel movable plates, and the two movable plates are arranged between the two first friction plates, and the two movable plates are respectively in contact with the two first friction plates; the intermediate plate is located between the two movable plates, and the two sides of the intermediate plate are respectively in contact with the two movable plates; the coil is wound on the intermediate plate.

[0008] Exemplarily, the fixed component further includes a fixed plate, and one end of the friction pressure plate away from the movable component is fixed on the fixed plate; and / or, the movable component further includes a connecting plate.

[0009] Exemplarily, the fixing assembly further includes a fixing block, which is disposed between the two first friction plates, and two sides of the fixing block are respectively in contact with the two first friction plates.

[0010] Exemplarily, the damper also includes an adjustment assembly, which includes an adjustment bolt and an adjustment nut; the adjustment bolt passes through the fixed assembly and the movable assembly from one side, and the adjustment nut is fixed to the protruding end of the adjustment bolt on the other side, and the movable assembly can move relative to the adjustment bolt.

[0011] According to another aspect of the present application, a control method for a magnetically controlled friction damper is provided, which is applied to the magnetically controlled friction damper in any of the above embodiments; the method includes: obtaining the vibration signal; and adjusting the current on the coil based at least on the vibration signal to change the damping effect between the fixed component and the movable component.

[0012] Exemplarily, adjusting the current on the coil at least based on the vibration signal includes: determining the control friction force of the structure to be attenuated based at least on the vibration signal, the mass of the structure to be attenuated, the stiffness of the structure to be attenuated, and the damping matrix of the structure to be attenuated; determining the target positive pressure of each contact surface between the fixed component and the movable component based on the control friction force; determining the driving current based on the target positive pressure; and adjusting the current on the coil based on the driving current; wherein the magnitude of the adjusted current on the coil is equal to the driving current.

[0013] Exemplarily, each contact surface between the fixed component and the movable component has the same size;

[0014] Determining the target normal pressure of each contact surface between the fixed component and the movable component based on the controlled friction force includes: determining the target normal pressure by the following formula:

[0015]

[0016]

[0017] in, represents the control friction force, represents the number of contact surfaces between the fixed component and the movable component, represents the target friction force on each contact surface, represents the friction coefficient, represents the target positive pressure;

[0018] and / or,

[0019] Determining the driving current based on the target positive pressure includes determining the driving current using the following formula:

[0020]

[0021]

[0022] in, represents the magnetic induction intensity, represents the area of ​​any contact surface, represents the vacuum permeability, represents the driving current, represents the number of turns of the coil, represents the length of the coil.

[0023] The above technical solution, by providing a coil on the movable or fixed component of the damper body and a sensor on the structure to be damped, can change the current in the coil according to the vibration signal collected by the sensor, thereby achieving dynamic adjustment of the damping effect. In summary, the damper in the above technical solution can not only play a conventional friction control effect, but also dynamically adjust the friction between the fixed component and the movable component according to the actual vibration of the structure to be damped. This method of actively controlling friction can improve the adaptive performance of the damper, making the damping effect of the damper more stable and reliable. When dealing with extreme dynamic effects such as strong winds and earthquakes, it can improve the stability and safety of the structure to be damped.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features, and advantages of the present invention will become more apparent through a more detailed description of the embodiments of the present invention with reference to the accompanying drawings. The accompanying drawings are provided to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and are not intended to limit the present invention. In the drawings, the same reference numerals generally represent the same components or steps.

[0026] Figure 1 A schematic diagram of the overall structure of a magnetically controlled friction damper according to an embodiment of the present application is shown;

[0027] Figure 2 Show Figure 1 A schematic cross-sectional view of a magnetically controlled friction damper according to the embodiment shown;

[0028] Figure 3 A schematic structural diagram of a fixing assembly according to an embodiment of the present application is shown;

[0029] Figure 4 A schematic structural diagram of a movable component according to an embodiment of the present application is shown;

[0030] Figure 5 A schematic diagram showing the overall structure of a magnetically controlled friction damper according to another embodiment of the present application is shown;

[0031] Figure 6 A schematic structural diagram of an intermediate plate according to an embodiment of the present application is shown;

[0032] Figure 7 A schematic structural diagram showing a movable component according to another embodiment of the present application;

[0033] Figure 8 A schematic flow chart showing a method for controlling a magnetically controlled friction damper according to an embodiment of the present application is shown.

[0034] In the figure: 1. Friction pressure plate; 2. First friction plate; 3. Magnetic conductive plate; 4. Coil; 5. Connecting plate; 6. Fixed plate; 7. Mounting hole; 8. Adjusting bolt; 9. Controller; 10. Sensor; 11. Second friction plate; 12. Fixed block; 13. Notch; 14. Intermediate plate; 15. Moving plate; 16. Adjusting nut. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0036] According to one aspect of the embodiments of the present application, a magnetically controlled friction damper is provided. Figure 1-2 or Figure 5 The magnetically controlled friction damper comprises: a damper body, a controller 9 and a sensor 10. The sensor 10 is arranged on the structure to be damped to collect vibration signals of the structure to be damped.

[0037] In the solution of this example, the damper body includes a fixed component and a movable component, the movable component is connected to the fixed component, and the movable component can move relative to the fixed component, and the coil 4 is set on the movable component or the fixed component. Figure 1 In the embodiment shown, the coil 4 is arranged on a movable component, such as Figure 5 In the embodiment shown, the coil 4 is arranged on a fixed component.

[0038] In the embodiment of the present invention, the controller 9 is used to obtain a vibration signal and adjust the current in the coil 4 based on at least the vibration signal to change the damping effect between the fixed component and the movable component. The controller 9 can be connected to the coil 4 and the sensor 10 respectively. Of course, the controller 9 can also be connected to a power supply for powering the coil 4 to control the current in the coil 4. In a specific embodiment, the controller 9 is connected to the sensor 10 and the coil 4 via a data line, and the power supply can be connected to the controller 9, and the power supply supplies power to the coil 4 via the controller 9.

[0039] Please note that Figure 1 、 Figure 5The structure shown is only an example and not a limitation of the present application. The magnetically controlled friction damper of the present application is not limited to Figure 1 The structure shown.

[0040] Herein, the structure to be damped may include but is not limited to highways, bridges, pipelines, and the like.

[0041] Optionally, the sensor 10 may be any one or more existing or future developed sensors capable of collecting vibration signals from the structure to be damped. The vibration signal may be represented by data collected by the corresponding sensor. Such sensors include, but are not limited to, displacement sensors, velocity sensors, acceleration sensors, and optical sensors. For example, the sensor may be a displacement sensor, which measures displacement changes during structural vibration, i.e., position changes relative to a reference position. In this embodiment, the vibration signal may be represented by displacement data collected by the displacement sensor. Another example may be a velocity sensor, which measures velocity changes during structural vibration, reflecting the energy of the structural vibration. In this embodiment, the vibration signal may be represented by velocity data collected by the velocity sensor. Another example may be an acceleration sensor, which measures acceleration during structural vibration, reflecting the magnitude of the impact force applied to the structure. In this embodiment, the vibration signal may be represented by acceleration data collected by the acceleration sensor. Another example may be an optical sensor, which uses optical principles to obtain information on vibration displacement, velocity, and acceleration, and can directly measure minute vibrations on the surface of the structure. In this embodiment, the vibration signal may include information on vibration displacement, velocity, and acceleration collected by the optical sensor. Those skilled in the art can understand the specific manner in which each sensor collects vibration signals, which will not be described in detail.

[0042] In this example, the sensor 10 is disposed on the structure to be damped. In some embodiments, the sensor 10 can be placed at key locations on the structure to be damped. These key locations can be determined using finite element analysis software. For example, the structure to be damped can be simulated and optimized using ANSYS to determine the optimal placement and design of the sensor 10. The specific implementation methods for these simulations and optimizations will be readily apparent to those skilled in the art and will not be elaborated upon here.

[0043] Optionally, the controller 9 may include the following units: a data acquisition unit, an embedded resistance control unit, an overvoltage and overcurrent protection unit, and a PWM constant current power amplifier unit. The data acquisition unit is used to obtain the vibration signal collected by the sensor 10. The embedded resistance control unit is used to calculate the vibration signal to obtain the driving current of the coil 4 and adjust the current on the coil 4 based on the driving current. The overvoltage and overcurrent protection unit can be used to protect the entire controller 9. The PWM constant current power amplifier unit can be used to ensure the stability of the overall operation of the controller 9. These four units can be interconnected by electrical signals.

[0044] In this example, the damping effect between the fixed and movable components can be varied by adjusting the current flowing through coil 4. As will be appreciated, when the current flowing through coil 4 changes, the magnetic flux density of the magnetic field generated by coil 4 changes, and thus the magnetic flux density around the movable or fixed component changes. This, in turn, affects the attractive force between the movable and fixed components, thereby altering the positive pressure between them. This change in positive pressure affects the magnitude of the friction force, thereby adjusting the damping effect.

[0045] The above technical solution, by disposing a coil 4 on the movable or fixed component of the damper body and a sensor 10 on the structure to be damped, can change the current in the coil 4 according to the vibration signal collected by the sensor 10, thereby achieving dynamic adjustment of the damping effect. In summary, the damper in the above technical solution can not only achieve a conventional friction control effect, but also dynamically adjust the friction between the fixed component and the movable component according to the actual vibration conditions of the structure to be damped. This active control of friction can improve the adaptive performance of the damper, making the damping effect of the damper more stable and reliable. It can also improve the stability and safety of the structure to be damped when responding to extreme dynamic forces such as strong winds and earthquakes.

[0046] For example, referring to Figure 1-3 The fixed assembly includes two parallel friction pressure plates 1, each with a first friction plate 2 fixed to its inner side. The movable assembly includes a magnetic permeable assembly, located between the two friction pressure plates 1, with its outer side in contact with the first friction plate 2. The coil 4 is mounted on the magnetic permeable assembly. In some embodiments, the coil 4 can be mounted on the end of the magnetic permeable assembly away from the two friction pressure plates 1. This prevents contact between the coil 4 and the first friction plate 2 when the magnetic permeable assembly moves, thereby reducing losses in the coil 4.

[0047] Optionally, the first friction plate 2 may be made of alloy steel, which can be attracted by the magnetic conductive component to change the positive pressure, thereby changing the friction between the two.

[0048] In this example, coil 4 is mounted on the magnetically conductive component. When the current flowing through coil 4 changes, the magnetic induction intensity around the movable component changes, which in turn causes a change in the attractive force between the movable component and the fixed component. This, in turn, changes the friction between the movable and fixed components, thereby adjusting the damping effect.

[0049] The above technical solution has a simple overall structure. By setting the coil 4 on the magnetic conductive component, when the current in the coil 4 changes, the magnetic induction intensity around the movable component can be changed, thereby achieving a change in the damping effect between the movable component and the fixed component.

[0050] For example, the magnetic conductive assembly includes a single magnetic conductive plate 3, with two sides of the plate in contact with the two first friction plates 2. A coil 4 is wound around the plate 3. In this exemplary embodiment, a closed magnetic circuit is formed between the plate 3 and the two first friction plates 2, with magnetic energy provided by the coil 4 wound around the plate 3. This solution has a simple overall structure and allows for dynamic adjustment of the damping effect, meeting user needs.

[0051] For example, referring to Figure 1-2 , 4, the magnetic conductive component includes two magnetic conductive plates 3 parallel to each other, the two magnetic conductive plates 3 are in contact with the two first friction plates 2 respectively, the number of coils 4 is two, and the two coils 4 are respectively wound on the two magnetic conductive plates 3; the fixed component also includes a second friction plate 11, the second friction plate 11 is located between the two magnetic conductive plates 3 and the two sides of the second friction plate 11 are in contact with the two magnetic conductive plates 3 respectively.

[0052] Optionally, the magnetic conductive plate 3 may be a magnetic conductive steel plate.

[0053] like Figure 2 As shown, in this embodiment, the side of the two magnetic conductive plates 3 that are closer to each other is the inner side, and the side that is farther away from each other is the outer side. The outer sides of the two magnetic conductive plates 3 are in contact with the two first friction plates 2, respectively, while the inner sides of the two magnetic conductive plates 3 are in contact with the second friction plate 11. During operation, the friction between the two magnetic conductive plates 3 and the first and second friction plates 2, 11 dissipates vibration energy, achieving the purpose of vibration reduction.

[0054] It is understood that the second friction plate 11 is fixed between the two first friction plates 2. During operation, both the first and second friction plates 2, 11, are stationary. Methods for securing the second friction plate 11 between the two first friction plates 2 include, but are not limited to, bolting, or providing a plate at the ends to connect the first and second friction plates 2, 11.

[0055] Optionally, the dimensions and sizes of the magnetic conductive plate 3, the first friction plate 2 and the second friction plate 11 may be optimized using finite element analysis to maximize the magnetic induction intensity of the magnetic circuit in the damper.

[0056] In this exemplary embodiment, the magnetic plate 3, the first friction plate 2, and the second friction plate 11 form a complete closed magnetic circuit. When the current in the coil 4 changes, the friction between the magnetic plate 3 and the first friction plate 2, and the friction between the magnetic plate 3 and the second friction plate 11, also change accordingly. In summary, the damper of the above technical solution has a simple overall structure. It not only functions as a conventional friction damper through the friction between the magnetic plate 3 and the first and second friction plates 2, 11, but also controls the friction between the magnetic plate 3 and the first and second friction plates 2, 11 by utilizing the current changes in the coil 4. This allows for dynamic adjustment of the damping effect to meet the needs of different vibration reduction scenarios.

[0057] For example, referring to Figure 5-7 The fixed component includes two parallel friction pressure plates 1 and an intermediate plate 14, and the first friction plates 2 are fixed on the inner sides of the two friction pressure plates 1; the movable component includes two parallel movable plates 15, and the two movable plates 15 are arranged between the two first friction plates 2, and the two movable plates 15 are respectively in contact with the two first friction plates 2; the intermediate plate 14 is located between the two movable plates 15, and the two sides of the intermediate plate 14 are respectively in contact with the two movable plates 15; the coil 4 is wound on the intermediate plate 14.

[0058] In this exemplary embodiment, the intermediate plate 14 is relatively fixedly disposed between the two first friction plates 2. The fixing method of the intermediate plate 14 is similar to the fixing method of the second friction plate 11 in the above embodiment and will not be described in detail.

[0059] Optionally, the middle plate 14 may be made of a magnetic conductive material.

[0060] In the embodiment of the present invention, the coil 4 is wound on the intermediate plate 14. In some embodiments, the coil 4 can be directly wound on the intermediate plate 14. Figure 6 In the illustrated embodiment, the middle plate 14 may include a plurality of openings, through which the coil 4 may be wound around the middle plate 14 .

[0061] It is understood that in order to prevent the coil 4 from affecting the movement of the movable plate 15, a specific structure can be set at the position where the coil 4 is located on the middle plate 14 or at the positions corresponding to the coil 4 on the two movable plates 15. Figure 7In the illustrated embodiment, a slot is provided on the movable plate 15 at a location corresponding to the coil 4. During damper operation, the coil 4 remains within this slot. The above embodiment is provided for illustrative purposes only and is not intended to limit the present application. In other embodiments, the thickness of the intermediate plate 14 at the location of the coil 4 may be reduced to prevent the coil 4 from interfering with the movement of the movable plate 15.

[0062] In this exemplary embodiment, the two first friction plates 2, the two movable plates 15, and the intermediate plate 14 form a complete closed magnetic circuit. When the current in the coil 4 changes, the friction between the intermediate plate 14 and the two movable plates 15, as well as the friction between the two movable plates 15 and the two first friction plates 2, also changes accordingly, thereby adjusting the damping effect. In summary, the damper structure of the above technical solution is simple, and the friction between the intermediate plate 14 and the two movable plates 15, as well as the friction between the two movable plates 15 and the two first friction plates 2, can be used to achieve the effects of a conventional friction damper. Furthermore, the damping effect of the damper can be adjusted by varying the current wound around the intermediate plate 14, thereby achieving dynamic adjustment of the damping effect to meet the needs of different vibration reduction scenarios.

[0063] Exemplarily, the fixed assembly further includes a fixed plate 6 , and one end of the friction pressure plate 1 away from the movable assembly is fixed on the fixed plate 6 ; and / or, the movable assembly further includes a connecting plate 5 .

[0064] Optionally, the friction pressure plate 1 and the fixing plate 6 can be cast as a single body, which helps to improve the overall structural strength.

[0065] Alternatively, as Figure 3 As shown, mounting holes 7 can be provided on the fixing plate 6 to facilitate installation.

[0066] In such Figure 1-2 In the embodiment shown in FIG. 4 , the end of the magnetic conductive assembly remote from the fixed assembly is connected to the connecting plate 5. In the embodiment where the magnetic conductive assembly includes two magnetic conductive plates 3, the ends of both magnetic conductive plates 3 remote from the fixed assembly are connected to the connecting plate 5. In a specific embodiment, the two magnetic conductive plates 3 can be cast as a single integral body with the connecting plate 5, which helps to improve structural strength.

[0067] In such Figure 7 In the embodiment shown, the ends of the two movable plates 15 away from the fixed assembly are both connected to the connecting plate 5. Similarly, the two movable plates 15 can be cast as a single integral body with the connecting plate 5.

[0068] Optionally, the fixing plate 6 , the connecting plate 5 and the friction pressure plate 1 may all be made of magnetically resistant materials (such as copper, stainless steel, etc.), which helps to reduce magnetic leakage and ensure the control effect on the friction force of the damper.

[0069] In the above technical solution, the fixed component includes the fixed plate 6, and / or the movable component includes the connecting plate 5. This structural design can facilitate connection with the structure to be damped through the fixed plate 6 and / or the connecting plate 5.

[0070] For example, see Figure 1-3 or Figure 5 The fixing assembly further includes a fixing block 12 , which is disposed between the two first friction plates 2 , and both sides of the fixing block 12 abut against the two first friction plates 2 .

[0071] In some embodiments, the fixing block 12 can be fixed between the two first friction plates 2 by bolts. Of course, the fixing block 12 can also be fixed between the two first friction plates 2 by means such as snap connection or plug connection, which is not limited in this application.

[0072] In the embodiment described above where the fixing assembly includes an intermediate plate 14, Figure 5 As shown, the end of the middle plate 14 can be connected to the fixing block 12 to fix the middle plate 14 .

[0073] In the solution of this example, there is a certain distance between the movable component and the fixed block 12 . When the movable component slides relative to the fixed component, appropriate space can be provided to prevent the movable component from colliding with the fixed block 12 .

[0074] Optionally, the material of the fixing block 12 may be a magnetic-resistance material to reduce magnetic leakage.

[0075] The above technical solution can fix the two first friction plates 2 by arranging the fixing block 12 between the two first friction plates 2, which helps to improve the overall structural strength of the damper.

[0076] Exemplarily, the damper also includes an adjustment assembly, which includes an adjustment bolt 8 and an adjustment nut 16; the adjustment bolt 8 passes through the fixed assembly and the movable assembly from one side, and the adjustment nut 16 is fixed to the protruding end of the adjustment bolt 8 on the other side, and the movable assembly can move relative to the adjustment bolt 8.

[0077] In the embodiment where the movable component includes the magnetic conductive plate 3, Figure 2 、 4 A long strip-shaped slot 13 is provided on the magnetic conductive plate 3 , and when the magnetic conductive plate 3 moves, the adjusting bolt 8 always passes through the slot 13 .

[0078] In such Figure 2In the embodiment shown, the friction pressure plate 1, the first friction plate 2 and the second friction plate 11 are all provided with through holes adapted to the adjusting bolt 8. The adjusting bolt 8 relatively fixes the fixed component and the movable component through the above-mentioned through holes and the slot 13 on the magnetic conductive plate 3 to limit the movable component.

[0079] In the above-mentioned embodiment where the movable component includes the movable plate 15 and the fixed component includes the intermediate plate 14, the adjusting bolt 8 can relatively fix the fixed component and the movable component through the through holes on the friction pressure plate 1 and the first friction plate 2, the slots on the movable plate 15 and the openings on the intermediate plate 14 to limit the movable component.

[0080] In the above technical solution, by setting the adjusting bolt 8 and the adjusting nut 16, on the one hand, the movable component can be limited, and on the other hand, the positive pressure between the fixed component and the movable component can be changed by tightening or loosening the adjusting nut 16 to ensure that there is still sufficient friction between the fixed component and the movable component even when the coil 4 is powered off, and the damper can still maintain a certain damping effect, reducing the vibration response of the structure through friction energy consumption, thereby ensuring the safety of the structure to be damped.

[0081] According to another aspect of the present application, a control method for a magnetically controlled friction damper is provided, which is applicable to the magnetically controlled friction damper of any of the above embodiments. The specific structure of the magnetically controlled friction damper has been described in detail above and will not be repeated here.

[0082] Figure 8 FIG. 1 is a schematic flow chart showing a control method of a magnetically controlled friction damper according to an embodiment of the present application. Figure 8 As shown, the method may include step S810 and step S820.

[0083] In step S810, a vibration signal is acquired.

[0084] It is understood that the vibration signal is collected by a sensor provided on the structure to be damped. The specific type of the sensor has been described in detail above and will not be repeated here.

[0085] In step S820, the current in the coil is adjusted based on at least the vibration signal to change the damping effect between the fixed component and the movable component.

[0086] It will be appreciated that the vibration signal can represent the vibration state of the structure to be damped. In this exemplary embodiment, the current in the coil can be adjusted based at least on the vibration state of the structure to be damped. This can ensure that the damping effect between the fixed and movable components is more closely aligned with actual use, thereby helping to improve the stability of the damper's vibration damping effect.

[0087] In some embodiments, adjusting the current in the coil based at least on the vibration signal may include the following steps: inputting the vibration signal into a pretrained neural network model to obtain a drive current; and adjusting the current in the coil according to the magnitude of the drive current. The above-described implementation of using a pretrained neural network model to obtain the drive current and adjust the current in the coil is merely an example. In other embodiments, the vibration signal may also be input into Dspace simulation system software and analyzed using an optimization algorithm to obtain the drive current.

[0088] In the above technical solution, the most appropriate current regulation strategy can be selected through real-time analysis of the vibration signal to accurately control the current on the coil. This method can achieve active adjustment of the friction force of the damper and improve the active controllability of the friction force. This active controllability helps to make the vibration reduction effect of the damper more stable, and this method of adjusting the damping effect according to the actual vibration state is more flexible and more adaptable to actual usage needs.

[0089] Exemplarily, the damper may further include a vibration pickup, which may be arranged at a vibration-sensitive location within a preset distance of the structure to be damped to detect an environmental vibration signal (which may be referred to as an environmental signal for short). The specific arrangement and position of the vibration pickup may be adjusted according to actual working conditions and relevant technical specifications, and will not be described in detail. In this example, the method may further include the following steps: calculating the external load force based on the environmental signal. It can be understood that the environmental signal can characterize the acceleration caused by the environmental vibration, and the external load force can characterize the inertial force caused by the environmental vibration on the structure to be damped. The specific calculation method for calculating the external load force based on the environmental signal is a conventional technical means in this field and will not be described in detail.

[0090] Exemplarily, step S820, adjusting the current on the coil based at least on the vibration signal, may specifically include the following steps S821, step S822, step S823 and step S824.

[0091] In step S821 , a control friction force of the structure to be damped is determined based on at least the vibration signal, the mass of the structure to be damped, the stiffness of the structure to be damped, and the damping matrix of the structure to be damped.

[0092] In step S822 , a target normal pressure of each contact surface between the fixed component and the movable component is determined based on the controlled friction force.

[0093] In step S823, the driving current is determined based on the target normal pressure.

[0094] In step S824, the current in the coil is adjusted based on the driving current; wherein the magnitude of the adjusted current in the coil is equal to the driving current.

[0095] Optionally, the mass and stiffness of the structure to be damped can be pre-analyzed using finite element analysis software. For example, ANSYS finite element software can be used to build a model of the structure to be damped, selecting appropriate element types, defining material properties, and meshing. The internally stored stiffness and mass matrices can be output using the HBMAT command. The damping matrix can be determined based on the mass and stiffness of the structure to be damped using the Rayleigh damping formula, which will not be described in detail here.

[0096] In this example, the control friction force of the structure to be damped can be determined based on the vibration signal, the mass of the structure to be damped, the stiffness of the structure to be damped, and the damping matrix of the structure to be damped. This process can be implemented using a pretrained neural network model. Alternatively, the control friction force can be calculated using the formula described below.

[0097] After obtaining the controlled friction force of the structure to be damped, the target normal pressure of each contact surface between the fixed component and the movable component can be determined. It is understood that there may be multiple contact surfaces between the fixed component and the movable component. For example, in the above Figure 2 In the illustrated embodiment, there are four contact surfaces: the contact surfaces between the two first friction plates and the two magnetically conductive plates, and the contact surfaces between the two magnetically conductive plates and the second friction plate. In this exemplary embodiment, a target positive pressure for each contact surface can be predetermined. This target positive pressure is the desired positive pressure between the fixed component and the movable component at each contact surface during damper operation.

[0098] After determining the target positive pressure at each contact surface, the drive current can be determined based on the target positive pressure at each contact surface. As described above, when the current in the coil changes, the positive pressure between each contact surface also changes. Therefore, the drive current in the coil can be determined by the positive pressure required between the fixed and movable components at each contact surface during damper operation.

[0099] After the driving current is obtained, the current on the coil can be adjusted based on the driving current, that is, the magnitude of the current on the coil is adjusted to the magnitude of the driving current.

[0100] This technical solution, based on the structural properties and vibration conditions of the structure to be damped, can accurately determine the required friction force (i.e., control friction) for the structure to be damped. This allows for precise adjustment of the coil drive current based on this control friction force. This method of using vibration feedback to adjust the damper can improve the stability of the vibration damping effect, thereby contributing to the safety of the structure to be damped.

[0101] For example, step S821, determining the control friction force of the structure to be damped based on at least the vibration signal, the mass of the structure to be damped, the stiffness of the structure to be damped, and the damping matrix of the structure to be damped, may specifically include the following steps: determining the control friction force by the following formula: :

[0102]

[0103] Where, represents the acceleration response of the structure to be damped, represents the velocity response of the structure to be damped, represents the displacement response of the structure to be damped, represents the mass of the structure to be damped, represents the stiffness of the structure to be damped, represents the damping matrix of the structure to be damped, Indicates the external load force.

[0104] As mentioned above, the sensor can be a displacement sensor, a velocity sensor, an acceleration sensor, an optical sensor, etc. The vibration signal obtained by the displacement sensor is the displacement response of the structure to be damped, the vibration signal obtained by the velocity sensor is the velocity response of the structure to be damped, the vibration signal obtained by the acceleration sensor is the acceleration response of the structure to be damped, and the vibration signal obtained by the optical sensor is the displacement, velocity and acceleration response of the structure to be damped. Any one of the above sensors or a combination of multiple sensors can be used to obtain 、 and For example, when the sensor is an accelerometer, the data collected by the accelerometer can be Integrate to get ,right Integrate to get .

[0105] Exemplarily, each contact surface between the fixed component and the movable component has the same size.

[0106] Step S822, based on the controlled friction force, determines the target normal pressure of each contact surface between the fixed component and the movable component, including: determining the target normal pressure by the following formula:

[0107]

[0108]

[0109] in, represents the control friction force, Represents the number of contact surfaces between the fixed component and the movable component, represents the target friction force on each contact surface, represents the friction coefficient, Indicates the target normal pressure. The value of the friction coefficient can be selected according to the actual working conditions.

[0110] and / or,

[0111] Step S823: Determine the driving current based on the target positive pressure, including determining the driving current using the following formula:

[0112]

[0113]

[0114] in, represents the magnetic induction intensity, represents the area of ​​any contact surface, represents the vacuum permeability, represents the driving current, Indicates the number of turns of the coil, Represents the length of the coil. The contact surface area, number of turns, and length of the coil can all be determined based on the actual damper's operation. The vacuum permeability value can be selected based on the actual operating conditions and will not be elaborated here.

[0115] In the above technical solution, each contact surface between the fixed component and the movable component is of the same size. Therefore, the friction force required to be achieved at each contact surface (i.e., the target friction force) is also consistent. In this case, the target normal pressure at any contact surface can be used to determine the drive current. This approach of ensuring that each contact surface is of the same size simplifies calculations and facilitates control of the damper's friction force.

[0116] The above technical solution can quickly and accurately determine the magnitude of the driving current, and can provide a relatively accurate basis for adjusting the coil current in subsequent steps.

[0117] A person skilled in the art can easily understand the structure, working principle and beneficial effects of the damper in the control method of the magnetically controlled friction damper by reading the above magnetically controlled friction damper. For the sake of brevity, they will not be described in detail here.

[0118] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present invention. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as claimed in the appended claims.

[0119] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0120] In the several embodiments provided herein, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is merely a logical functional division. In actual implementation, other division methods may be used. For example, multiple units or components may be combined or integrated into another device, or some features may be omitted or not implemented.

[0121] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0122] Similarly, it should be understood that in order to streamline the present invention and aid in understanding one or more of the various inventive aspects, in the description of exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach to the present invention should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0123] Those skilled in the art will understand that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings), as well as all processes or units of any method or apparatus disclosed herein, may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

[0124] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

[0125] The various component embodiments of the present invention may be implemented in hardware, as software modules running on one or more processors, or as a combination thereof. Those skilled in the art will appreciate that, in practice, a microprocessor or digital signal processor (DSP) may be used to implement some or all of the functionality of some modules within the controller of a damper according to embodiments of the present invention. The present invention may also be implemented as a device program (e.g., a computer program or computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium or in the form of one or more signals. Such signals may be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0126] It should be noted that the above embodiments illustrate rather than limit the invention, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0127] The foregoing description is merely a specific embodiment of the present invention or an illustration of a specific embodiment. The scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be encompassed by the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A magnetically controlled friction damper, characterized in that: include: Damper body, controller, sensor and coil; The sensor is arranged on the structure to be damped to collect the vibration signal of the structure to be damped; The damper body includes a fixed component and a movable component, the movable component is connected to the fixed component and can move relative to the fixed component; the coil is arranged on the movable component or the fixed component; The controller is used to obtain the vibration signal and adjust the current of the coil based on at least the vibration signal to change the damping effect between the fixed component and the movable component; the fixed component includes two parallel friction pressure plates, and a first friction plate is fixed to the inner side of each friction pressure plate; The movable component includes a magnetic conductive component, which is located between the two friction pressure plates, and the outer side of the magnetic conductive component is in contact with the first friction plate; the coil is arranged on the magnetic conductive component; The magnetic conductive assembly includes a magnetic conductive plate, the number of the magnetic conductive plate is one, and both sides of the magnetic conductive plate are in contact with the two first friction plates respectively; the coil is wound on the magnetic conductive plate; or, The magnetic conductive assembly includes two magnetic conductive plates parallel to each other, the two magnetic conductive plates are in contact with the two first friction plates respectively, and the number of the coils is two, and the two coils are respectively wound on the two magnetic conductive plates; The fixing assembly further includes a second friction plate, the second friction plate being located between the two magnetic conductive plates and having two sides of the second friction plate in contact with the two magnetic conductive plates respectively; The fixing assembly includes two mutually parallel friction pressure plates and an intermediate plate, and the first friction plate is fixed on the inner side of each of the two friction pressure plates; The movable assembly includes two movable plates parallel to each other, the two movable plates are arranged between the two first friction plates, and the two movable plates are in contact with the two first friction plates respectively; The middle plate is located between the two movable plates, and two sides of the middle plate are in contact with the two movable plates respectively; the coil is wound on the middle plate.

2. The magnetically controlled friction damper according to claim 1, characterized in that: The fixed component further includes a fixed plate, and one end of the friction pressure plate away from the movable component is fixed on the fixed plate; and / or the movable component further includes a connecting plate.

3. The magnetically controlled friction damper according to claim 1, characterized in that: The fixing assembly further includes a fixing block, which is disposed between the two first friction plates, and two sides of the fixing block are respectively in contact with the two first friction plates.

4. The magnetically controlled friction damper according to claim 1, characterized in that: Also included is an adjustment assembly, the adjustment assembly including an adjustment bolt and an adjustment nut; The adjusting bolt passes through the fixed component and the movable component from one side, and the adjusting nut is fixed to the protruding end of the adjusting bolt on the other side, and the movable component can move relative to the adjusting bolt.

5. A control method for a magnetically controlled friction damper, characterized in that: Applicable to the magnetically controlled friction damper according to any one of claims 1 to 4; The method comprises: acquiring the vibration signal; Based at least on the vibration signal, the current in the coil is adjusted to change the damping effect between the fixed component and the movable component.

6. The control method according to claim 5, characterized in that: The adjusting the current in the coil based at least on the vibration signal comprises: determining a control friction force of the structure to be damped based at least on the vibration signal, the mass of the structure to be damped, the stiffness of the structure to be damped, and the damping matrix of the structure to be damped; determining a target normal pressure for each contact surface between the fixed component and the movable component based on the controlled friction force; determining a driving current based on the target positive pressure; adjusting the current in the coil based on the driving current; The magnitude of the regulated current on the coil is equal to the driving current.

7. The control method according to claim 6, characterized in that: The sizes of each contact surface between the fixed component and the movable component are the same; Determining the target normal pressure of each contact surface between the fixed component and the movable component based on the controlled friction force includes: determining the target normal pressure by the following formula: in, represents the control friction force, represents the number of contact surfaces between the fixed component and the movable component, represents the target friction force on each contact surface, represents the friction coefficient, represents the target positive pressure; and / or, Determining the driving current based on the target positive pressure includes determining the driving current using the following formula: in, represents the magnetic induction intensity, represents the area of ​​any contact surface, represents the vacuum permeability, represents the driving current, represents the number of turns of the coil, represents the length of the coil.

Images