65results about How to "Change the damping force" patented technology

The present invention discloses a cylinder washing machine having a magneto-rheological active damper and belongs to the technology field of household appliances. The objective of the present invention is to improve damping mechanisms of a cylinder washing machine and then to provide a cylinder washing machine having a magneto-rheological active damper. Said washing machine comprising a machine housing and a washing cylinder equipped with asuspension spring and a matching block thereon is characterized in that at least two magneto-rheological active dampers are mounted below the washing cylinder. The magneto-rheological active dampers are connected to an electronic control unit which is connected to a sensor unit to form a closed loop control return. The damping force is adjusted real time and exactly, on the basis of vibration instances acquired, with a reflection velocity of 10-20 ms. Said cylinder washing machine is capable of adjusting damping force of a damper in time according to its vibration instances, then to achieve the purpose of eliminating or reducing vibrations of a washing machine. Said damper can be applied in a variety of cylinder washing machines.

An electronic control unit determines driving force that is generated on wheels and has an identical absolute value and opposite directions to each other in order to suppress pitch behavior and / or heave behavior occurring on a vehicle body in association with travelling of a vehicle. Then, the unit controls the drive of in-wheel motors through an inverter based on the driving force. On the other hand, electronic control unit changes the damping forces of shock absorbers constituting suspension mechanisms in response to the pitch behavior and / or the heave behavior occurring on the vehicle body. In this way, by controlling one of the pitch behavior and the heave behavior that may occur in combination, enhancing of the occurrence of the other one that is not intended can be prevented effectively, and the occurrence of intended behavior on the vehicle body can be controlled independently.

The invention discloses a semi-active vehicle suspension system with a vibration energy recycling function. The system comprises a damper, a spring, a control system and an energy recycling system; the damper comprises a hydraulic cylinder, a hydraulic motor, a direct-current motor, a first transmission shaft, a first roller clutch, a second roller clutch, a first bevel gear, a second bevel gear, a third bevel gear and a second transmission shaft; the control system comprises a suspension vibration controller, a force sensor, a sprung mass acceleration sensor, a sprung mass displacement sensor, a non-sprung mass displacement sensor and a direct-current motor driver; the energy recycling system comprises an energy recycling circuit and a super capacitor. The invention further discloses a control method of the semi-active vehicle suspension system with the vibration energy recycling function. Accordingly, the working stability and reliability are high, the energy feedback efficiency is high, the service life of a vehicle-mounted storage battery can be effectively prolonged, parameters of a semi-active suspension can be duly adjusted, and then the semi-active suspension is in an optimal vibration reduction state.

A damping-rigidness-controllable double-freedom-degree vibration active control platform comprises a cross-shaped beam frame and a square base which are connected through a flexible hinge. A cross-shaped beam of the cross-shaped beam frame is distributed in the diagonal directions of the square base. A structure column is arranged at the center of the cross-shaped beam frame. Sensors and actuators are connected between the lower portions of the diagonal top ends of the cross-shaped beam frame and the square base respectively. Four limiting columns are arranged between the cross-shaped beam of the cross-shaped beam frame and the square base respectively. Prearranged gaps are reserved between the limiting columns and the cross-shaped beam frame. Four balancing weights are fixed on the lower portion of the cross-shaped beam frame between the sensors or the actuators and the limiting columns respectively. Twisting limiting spring pieces are arranged at the symmetrical positions on the lower portion of the cross-shaped beam frame between the limiting columns and the flexible hinge. The electromagnetic type sensors and the electric-damping electric-rigidness actuators are used to achieve detecting of angular speed and actuating, the flexible hinge and the spring piece with changeable thickness are combined to achieve controllable damping and rigidness in a quantifying mode, and double-freedom-degree vibration active control in the x direction and the y direction of the structure is achieved.

The invention discloses a damping regulation device suitable for a magnetorheological damper. The damping regulation device comprises a magnetism isolation cover and a driving mechanism, wherein the magnetism isolation cover is arranged on a piston rod of the agnetorheological damper in a sleeving mode and located in a cylinder barrel of the agnetorheological damper, and the driving mechanism is used for providing driving force enabling the magnetism isolation cover to move axially along the piston rod. According to the damping regulation device suitable for the magnetorheological damper, the movable magnetism isolation cover is arranged in the cylinder barrel, and a magnetic field generated by a permanent magnet arranged on a piston assembly is shielded by regulating the position of the magnetism isolation cover; the nature of magnetorheological fluid is changed along with the change of the magnetic field, so that damping force of the damper is changed and damping regulation is achieved.

The invention provides an active hydraulic interconnected type energy reclaiming suspension. A left suspension and a right suspension are backwards and mutually connected through a connecting pipeline, and hydraulic motors are mounted on interconnected pipelines. Under a passive mode, oil fluid flows in systems, the hydraulic motors enable the kinetic energy of the oil fluid to be converted into the mechanical energy of a primary section of a linear motor through a gear transmission mechanism, and the primary section of the linear motor moves back and forth in a secondary section to cut magnetic induction lines so as to generate electric currents which are stored in vehicle-mounted cells through the energy reclaiming circuit. In addition, data collected by an ECU of the energy reclaiming control module through displacement sensors can realize active control on the acting force of the suspensions. Two working modes are switched, so that not only is the riding comfort of a vehicle improved, but also partial vibration energy is recovered, and the functions of saving energy and reducing emission are realized.

The invention discloses a damping-adjustable magnetorheological damper. The damping-adjustable magnetorheological damper comprises a cylinder barrel, a piston rod, a piston assembly and a damping adjusting device, wherein the piston assembly is arranged in the cylinder barrel, and is connected with the piston rod; the damping adjusting device comprises a magnetic separation cover coating the piston rod and positioned in the cylinder barrel, and a driving mechanism for providing driving force; and the driving force provided by the driving mechanism enables the magnetic separation cover to axially move along the piston so as to adjust the position of covering the piston assembly. The magnetorheological damper is provided with the movable magnetic separation cover in the cylinder barrel; a magnetic field of a permanent magnet arranged on the piston assembly is shielded through adjusting the position of the magnetic separation cover; and the property of magnetorheological liquid is changed through changing the magnetic field, so that the damping force of the damper is changed, and the damping adjusting purpose is achieved.

The invention discloses a damping adjustment device suitable for a hydraulic damper. The hydraulic damper comprises a cylinder barrel and a piston assembly arranged in the cylinder barrel. The damping adjustment device comprises a pressure adjustment valve and a driving mechanism connected with the pressure adjustment valve, wherein the pressure adjustment valve is used for providing pressure oil for the piston assembly, and the pressure oil is used for adjusting the magnitude of the clearance between the piston assembly and the inner wall of the cylinder barrel. According to the damping adjustment device suitable for the hydraulic damper, the pressure oil is provided for the hydraulic damper by arranging the pressure adjustment valve and used for adjusting the magnitude of the clearance between the piston assembly inside the hydraulic damper and the inner wall of the cylinder barrel, and the magnitude of the opening degree of a damping channel can be adjusted, so that the damping force of the damper is changed, and the damping adjustment purpose is achieved.

The invention discloses an electro-rheological damper. The electro-rheological damper comprises a cylinder barrel, a piston rod, a piston assembly and a damping adjusting device, wherein the piston assembly is arranged in an inner cavity of the cylinder barrel; the piston assembly has a plurality of throttle holes for allowing an electro-rheological fluid to pass through; the piston rod penetrates through the cylinder barrel and the piston assembly and is connected with the piston assembly; and the damping adjusting device comprises first damping pins and second damping pins which are rotatably arranged inside the piston assembly and are used for adjusting the numbers of the throttle holes in open or closed states, a frequency damping adjusting device connected with the first damping pins, and an amplitude damping adjusting device connected with the second damping pins. According to the electro-rheological damper, the first damping pins and the second damping pins are arranged inside the piston assembly, and the numbers of the throttle holes in open or closed states are adjusted through the first damping pins and the second damping pins, so that the damping force of the damper is changed, and the purpose of damping adjustment is achieved.

The invention discloses a combined energy feedback type semi-active suspension fork actuator and a control method thereof. The combined energy feedback type semi-active suspension fork actuator comprises an actuator body and a monitoring device, wherein the actuator body comprises an air spring mechanism and a linear motor; the air spring mechanism comprises an air spring, an air spring upper endcover and an air spring lower end cover; the linear motor comprises a secondary permanent magnet assembly and a primary coil assembly; the secondary permanent magnet assembly comprises a linear motorsecondary housing and a secondary permanent magnet. The control method comprises the following steps of I, performing data acquisition and synchronous transmission; II, adjusting the height differenceof spring mass and non-spring mass in the starting stage of a vehicle; III, adjusting the height difference of the spring mass and the non-spring mass in the travelling stage of the vehicle and electromagnetic damping force; and IV, after the vehicle stops travelling, adjusting the height difference of the spring mass and the non-spring mass. Through the adoption of the combined energy feedback type semi-active suspension fork actuator disclosed by the invention, the stability and the smoothness of the vehicle can be improved; and energy generated by the actuator is recovered, and the energyconsumption of the vehicle is reduced.

The invention relates to a bidirectional adjustable shock absorber which comprises a liquid storage cylinder assembly, a compression valve assembly and an oil sealing guide device assembly. The liquid storage cylinder assembly is internally provided with a piston rod assembly capable of moving axially. The bottom of the piston rod assembly is fixedly provided with a recover valve assembly. The piston rod assembly comprises a hollow piston rod body, an interlocking nut, a positioning sleeve assembly, an ejector rod and an ejector rod adjuster assembly. The hollow piston rod body is provided with an overflowing hole. The overflowing hole is communicated with an inner cavity of the liquid storage cylinder assembly through the interlocking nut. By means of the bidirectional adjustable shock absorber, the damping of the shock absorber can be adjusted according to different use road conditions, the manipulation of an automobile can be improved accordingly, and manipulation is made to be more comfortable. The bidirectional adjustable shock absorber is stable in damping force, high in production efficiency and good in stability.

A damping valve includes a valve disk, a retainer, an inner peripheral side flow passage configured to include a valve disk through hole formed in an inner peripheral side of the valve disk and a retainer through hole formed in the retainer and allowing communication between one and other chambers, an outer peripheral side flow passage formed in an outer peripheral side of the valve disk and allowing communication between the one and the other chambers, and a leaf valve in the form of an annular plate arranged on a side of the retainer opposite to the valve disk and configured to openably close the inner peripheral side flow passage by an outer peripheral part. A flow passage area of the retainer through hole is not smaller than that of the valve disk through hole.

The invention discloses a swing suppression energy dissipation device. The swing suppression energy dissipation device comprises a connection part and an energy dissipation part. The left and right sides of the energy dissipation part are each provided with an energy dissipation cylinder. The left and right energy dissipation cylinders belong to airtight cylindrical tubes. The energy dissipation cylinders contain magneto-rheological fluid. A magnet exciting coil is coiled on the periphery of each cylindrical tube and connected with a piezoelectric unit. The cylindrical tubes on the two sides are each internally provided with a rolling wheel. A gear is arranged between the two cylindrical tubes. The rolling wheels and the gear are fixed through a connecting shaft and can rotate coaxially. The connection part is composed of a hollow box-type tube in the middle and toothed plates on the left and right sides. Piezoelectric power generation units are arranged at the bottom end of the hollowbox-type tube and in the middle position of the interior of a main body of the energy dissipation part correspondingly. The two ends of each piezoelectric power generation unit are provided with pressure sensors. The box-type tube is internally provided with a mass body. The mass body is connected with the two ends of the box-type tube through springs. The toothed plates of the connection part are engaged with the gear of the energy dissipation part. The periphery of the whole energy dissipation part is totally enclosed.

The invention discloses an inertia energy feedback device for new energy vehicles and a working method. The inertia energy feedback device can realize three different working modes of energy feedback,passive control and active control by adopting a structural form coupling a linear motor and a rotating motor. Vibration energy recovery of the system can be effectively achieved under the energy feedback mode, and higher energy recovery efficiency is achieved; under the passive control mode, a complex mechanical network can be simulated through an outer end electric network of the linear motor and the rotating motor, and meanwhile integrated design of a complex electromechanical network is achieved; and under the active control mode, the inertia energy feedback device for new energy vehiclescan be used as a force generator to perform tuning control on a vibration system. According to the inertia energy feedback device for new energy vehicles, complex system impedance output can be achieved, the influence of nonlinear factors on the inertia energy feedback device is small, the dynamic performance is excellent, the installation space can be effectively saved, and vibration energy canbe recycled.

The invention discloses a gear and rack type electromechanical inertia mass energy feedback device, which adopts a structural form of coupling a linear motor, a rotating motor and a rack and rack mechanism, and can realize three different working modes of energy feedback, passive control and active control, wherein the vibration energy recovery of the system can be effectively realized in the energy feedback mode so as to achieve high energy recovery efficiency, in the passive control mode, a complex mechanical network can be simulated through the linear motor and an electric network on the outer end of the rotating motor while integrated design of the complex mechanical and electrical network is achieved, and in the active control mode, the gear and rack type electromechanical inertia mass energy feedback device can be used as a force generator to perform tuning control on the vibration system. According to the invention, the novel gear and rack type electromechanical inertia mass energy feedback device is excellent in dynamic performance, has multiple working modes, can achieve complex system impedance output, effectively saves installation space and achieves recovery of vibration energy.

The invention discloses an intelligent damper capable of being used for vibration isolation of a resonance band and belongs to the field of resonance vibration isolation devices. The intelligent damper comprises a U-shaped casing, an vibration isolation body freely movable relative to the U-shaped casing and an end cover mounted on the U-shaped casing, wherein the vibration isolation body comprises a device platform for installing a vibration-isolated object, a vibration isolation frame passing through a linear bearing mounted on the end cover, and a permanent magnet A mounted at the bottom ofthe vibration isolation frame. A permanent magnet B is mounted on the upper surface of the bottom of the U-shaped casing. The U-shaped casing contains a certain amount of magnetorheological fluid. Ametal coil spring is disposed between the permanent magnet A and the permanent magnet B, the lower end of the metal coil spring is fixedly mounted on the permanent magnet B, and the upper end of the metal coil spring is kept free. The intelligent damper has a simple and reasonable structure, has a small natural frequency, can achieve significant adjustment of a damping coefficient without consuming external energy, and is particularly suitable for performing vibration isolation in a resonance region.

The invention relates to a direct-acting magneto-rheological fluid shock absorber with controllable stiffness, which belongs to the technical field of vibration control. The shock absorber includes the controlled object and the magnetorheological fluid shock absorber, wherein the controlled object is the vibration control object, and the magnetorheological fluid shock absorber is composed of a support plate, a slide rail, a slider, a connecting plate, a lock nut, Gasket, piston rod, upper piston, outer sleeve, excitation coil, inner sleeve, damping channel, magnetorheological fluid, lower piston, floating piston, nitrogen chamber and working cylinder. The stiffness of the magnetorheological fluid in the magnetorheological fluid damper can be controlled by changing the current of the excitation coil, so as to meet the internal resonance requirements between the controlled object and the magnetorheological fluid damper in the system. The damping consumes vibration energy to achieve the purpose of vibration reduction. The invention utilizes the internal resonance phenomenon for vibration reduction, has obvious vibration reduction effect, strong robustness and less energy consumption, and has good practical value in the vibration reduction of vehicle engines, flexible mechanical arms and other fields.

The invention discloses a damping adjustment device suitable for an electrorheological damper. The damping adjustment device comprises first damping fins, second damping fins, a frequency damping adjustment device connected with the first damping fins and an amplitude damping adjustment device connected with the second damping fins, wherein the first damping fins and the second damping fins are rotatable, arranged in a piston assembly of the electrorheological damper and used for adjusting the number of throttling holes in opened or closed state. According to the damping adjustment device suitable for the electrorheological damper, as the first damping fins and the second damping fins are arranged in the piston assembly, and the number of the throttling holes in opened or closed state is adjusted through the first damping fins and the second damping fins, the damping force of the electrorheological damper can be changed, and the purpose of damping adjustment is achieved.

A damping force change mechanism includes an on-off valve located in a through hole of a piston rod. The on-off valve opens / closes a third hydraulic oil passage that allows a first oil chamber on a free piston side and a second oil chamber between a first piston and a second piston to communicate with each other. The on-off valve includes an expanded diameter portion in the first oil chamber extending outward in the radial direction. The expanded diameter portion faces the entire opening edge of the through hole and tightly contacts an end surface of the piston rod. The magnitude of a damping force is easily changed, and a damping force characteristic in a case in which the damping force is large is stabilized.

The invention relates to a shear valve type magnetorheological damper and a parameter optimization method thereof. The shear valve type magnetorheological damper comprises an outer cylinder barrel (4A), inner cylinder barrels (4B), a piston rod (7), a piston (6A), coils (5) and magnetorheological fluid (3). The number of the inner cylinder barrels (4B) is multiple. The inner cylinder barrels (4B) are the same in outer diameter and height and different in thickness. Piston rings (6B) are installed at the end of the piston (6A) and can be disassembled and replaced. The number of the piston rings (6B) is multiple. The piston rings (6B) are the same in inner diameter and outer diameter and different in thickness. According to the shear valve type magnetorheological damper, the force output range of the damper is adjusted by replacing the piston rings different in thickness and the inner cylinder barrels different in thickness, the effects of being simple and reliable are achieved, and the cost is reduced.

The invention provides a damping self-adaptive adjusting shock absorber and an automobile. The shock absorber comprises a cylinder body and a hydraulic rod, wherein one end of the hydraulic rod penetrates through a limiting block in the cylinder body so as to extend into the cylinder body, and a piston ring further sleeves the hydraulic rod so that the cylinder body is divided into a hydraulic cylinder upper cavity and a hydraulic cylinder lower cavity; and a flow guide hole and upper throttling holes communicating with the flow guide hole are formed in the hydraulic rod, and the apertures ofthe multiple upper throttling holes are in an gradual change mode. According to the shock absorber, structurally, the damping force output by the shock absorber can be changed through utilizing the throttling holes when the hydraulic rod of the shock absorber performs a working stroke of compressing or stretching.

A damping-rigidness-controllable double-freedom-degree vibration active control platform comprises a cross-shaped beam frame and a square base which are connected through a flexible hinge. A cross-shaped beam of the cross-shaped beam frame is distributed in the diagonal directions of the square base. A structure column is arranged at the center of the cross-shaped beam frame. Sensors and actuators are connected between the lower portions of the diagonal top ends of the cross-shaped beam frame and the square base respectively. Four limiting columns are arranged between the cross-shaped beam of the cross-shaped beam frame and the square base respectively. Prearranged gaps are reserved between the limiting columns and the cross-shaped beam frame. Four balancing weights are fixed on the lower portion of the cross-shaped beam frame between the sensors or the actuators and the limiting columns respectively. Twisting limiting spring pieces are arranged at the symmetrical positions on the lower portion of the cross-shaped beam frame between the limiting columns and the flexible hinge. The electromagnetic type sensors and the electric-damping electric-rigidness actuators are used to achieve detecting of angular speed and actuating, the flexible hinge and the spring piece with changeable thickness are combined to achieve controllable damping and rigidness in a quantifying mode, and double-freedom-degree vibration active control in the x direction and the y direction of the structure is achieved.

An electronic control unit determines driving force that is generated on wheels and has an identical absolute value and opposite directions to each other in order to suppress pitch behavior and / or heave behavior occurring on a vehicle body in association with travelling of a vehicle. Then, the unit controls the drive of in-wheel motors through an inverter based on the driving force. On the other hand, electronic control unit changes the damping forces of shock absorbers constituting suspension mechanisms in response to the pitch behavior and / or the heave behavior occurring on the vehicle body. In this way, by controlling one of the pitch behavior and the heave behavior that may occur in combination, enhancing of the occurrence of the other one that is not intended can be prevented effectively, and the occurrence of intended behavior on the vehicle body can be controlled independently.

The invention discloses a damping regulation device suitable for a magnetorheological damper. The damping regulation device comprises a magnetism isolation cover and a driving mechanism, wherein the magnetism isolation cover is arranged on a piston rod of the agnetorheological damper in a sleeving mode and located in a cylinder barrel of the agnetorheological damper, and the driving mechanism is used for providing driving force enabling the magnetism isolation cover to move axially along the piston rod. According to the damping regulation device suitable for the magnetorheological damper, the movable magnetism isolation cover is arranged in the cylinder barrel, and a magnetic field generated by a permanent magnet arranged on a piston assembly is shielded by regulating the position of the magnetism isolation cover; the nature of magnetorheological fluid is changed along with the change of the magnetic field, so that damping force of the damper is changed and damping regulation is achieved.

The invention discloses a liquid damper with damping force in direct proportion to displacement, and belongs to the technical field of liquid dampers. The liquid damper comprises a threaded cylinder body, an end cover A, an end cover B and a threaded piston rod. External threads are arranged in the middle of the threaded piston rod, and polish rods are arranged at the two ends of the threaded piston rod. A rotation damping device, four planetary damping devices and a gear axial positioning device are further arranged in the threaded cylinder body. The rotation damping device comprises a threaded gear, a U-shaped cylinder A and a U-shaped cylinder B. A fixed three-leaf plate A is arranged at the right end of the U-shaped cylinder A, and a sliding three-leaf plate A is arranged on the inner wall of the U-shaped cylinder B. The planetary damping device comprises a planetary gear, a U-shaped cylinder C and a U-shaped cylinder D. A fixed three-leaf plate B is arranged at the right end of the U-shaped cylinder C, and a sliding three-leaf plate B is arranged on the inner wall of the U-shaped cylinder D. According to the liquid damper, the structure is simple and reasonable, the damping force is changed by changing the volume and mass of the rotary motion damping liquid, and the damping force is in direct proportion to displacement.

The invention discloses a ventilation air-conditioning equipment shock insulation machine room and a construction method and regulation system thereof. The ventilation air-conditioning equipment shock insulation machine room comprises a machine room body, wherein the machine room body comprises a support frame arranged on the ground and a support platform for supporting the machine room body, a damping support device capable of reducing vibration of the support platform on the support frame through elastic action is arranged between the support platform and the support frame, and an adjusting device capable of adjusting the damping force of the damping support device through compression action is arranged in the damping support device. By additionally arranging the adjusting device, the damping force of the damping support device can be changed so as to change the frequency of an elastic material, and then vibration on the support frame caused by the support platform is effectively reduced and denoising is achieved; meanwhile, due to the fact that the support platform is connected with the ground through the support frame only, vibration can only be transmitted through the damping support device, and then vibration can be effectively reduced by changing the elasticity and frequency of the position.

The invention relates to a clinical pulmonary function rehabilitation training device. The clinical pulmonary function rehabilitation training device comprises a cylindrical pipe, wherein a connectorand a sealing seat are detachably mounted at two ends of the cylindrical pipe respectively; a blowing nozzle is mounted at one end, far away from the cylindrical pipe, of the connector; a piston is arranged at the inner side of the cylindrical pipe; the piston is connected with an elastic assembly arranged at the inner side of the cylindrical pipe; the elastic assembly is connected with an adjusting mechanism mounted in the cylindrical pipe; a one-way air inlet valve and a one-way air outlet valve are mounted on a side wall of the cylindrical pipe respectively; an air outlet cavity sleeves theouter side of the one-way air outlet valve; a separation plate is fixed at the inner side of the air outlet cavity; a movable baffle plate is arranged at one side of the separation plate; and throughholes are formed in the movable baffle plate and the separation plate. A rotary ring is arranged and can be used for adjusting a passing area between the separation plate and the movable baffle plate, so that an air outlet speed is realized and further adjustment of a damping force is realized; meanwhile, blowing durability training of a user can be realized and a better lung training effect is realized.

A damping force change mechanism includes an on-off valve located in a through hole of a piston rod. The on-off valve opens / closes a third hydraulic oil passage that allows a first oil chamber on a free piston side and a second oil chamber between a first piston and a second piston to communicate with each other. The on-off valve includes an expanded diameter portion in the first oil chamber extending outward in the radial direction. The expanded diameter portion faces the entire opening edge of the through hole and tightly contacts an end surface of the piston rod. The magnitude of a damping force is easily changed, and a damping force characteristic in a case in which the damping force is large is stabilized.

The invention discloses a suspension type composite tuning vibration reduction device and method, and belongs to the technical field of vibration reduction. According to the technical scheme, the suspension type composite tuning vibration reduction device comprises a frame body and a suspension mechanism which is arranged in the center of the frame body and can rotate relative to the frame body, and a mass ball is installed at the tail end of the suspension mechanism; a plurality of energy consumption units which are arranged at intervals in the circumferential direction of the suspension mechanism are fixed on the frame body; and each energy consumption unit comprises a damping cavity and a stirring mechanism arranged in the damping cavity, the stirring mechanisms are connected with the suspension mechanism through traction ropes, and the suspension mechanism can drive the stirring mechanisms to stir magnetorheological fluid filled in the damping cavities when swinging. According to the suspension type composite tuning vibration reduction device and method, the vibration response of a power transmission tower structure in all directions under the action of external force can be reduced, and the purposes of energy consumption and vibration reduction are achieved; and the natural vibration period of a mass pendulum can be adjusted.

The invention discloses a self-adjusting magnetorheological damper for vibration reduction of a pipeline. The self-adjusting magnetorheological damper for vibration reduction of the pipeline comprisesan upper pipe clamp, a lower pipe clamp, a piston rod, a cylinder cover, a damper cylinder body, a magnetic isolation cover, a spring upper pressing disc, a self-adjusting spring, a spring lower pressing disc, a permanent magnet, a magnetic isolation cover sealing cover, a magnetic isolation disc and magnetorheological damping fluid; the self-adjusting magnetorheological damper is applied to pipeline vibration reduction of petroleum and petrochemical industry, high temperature and high pressure, oil and gas transportation and inflammable and explosive media, and compared with an actively controlled magnetorheological damper and other self-adjusting magnetorheological dampers, the self-adjusting magnetorheological damper is simple in structure, convenient to disassemble and assemble, freeof complex threading and control parts, single in equipment fault point, convenient to maintain and capable of saving cost. According to Newton's first law and Hooke's law, the permanent magnet stretches and retracts in the closed magnetic isolation cover along with the vibration of the pipeline, the magnetic induction intensity exposed from the magnetic isolation cover is different due to different volumes of the permanent magnet exposed out of the magnetic isolation cover, the damping size of the magnetorheological damper is changed, and the vibration reduction function of the pipeline is realized.