98results about How to "Change damping" patented technology

The invention relates to a car collision cushioning device and a cushioning energy-absorbing method based on the magnetorheological technology. The cushioning device comprises a bumper, a magnetorheological buffer and a feedback circuit, wherein the magnetorheological buffer is arranged between the bumper and a frame cross member by flanges and composed of a helical spring, a field core, a piston, a piston rod, a cylinder, magnetorheological fluid, a first actuating coil, a magnetorheological elastomer and a second actuating coil, the feedback circuit is composed of a first acceleration sensor, a second acceleration sensor and a controller, in an instant of car collision, the controller judges whether the acceleration signal differential value of the acceleration sensor exceeds a preset threshold value or not, and regulates current output to the first actuating coil and the second actuating coil by self-adapting according to difference of collision speed, changes rigidity and damp of a car collision cushioning system, thereby reducing passenger injury and car damage caused by collision.

The invention discloses a multi-mode electromagnetic energy-regenerative vehicle active suspension actuator. The multi-mode electromagnetic energy-regenerative vehicle active suspension actuator comprises an actuator main body and an actuator controller, wherein the actuator main body comprises a piston cylinder, a permanent magnet linear motor module, an adjustable damping vibration absorber module, an actuator upper end cover and a lower lifting lug. The permanent magnet linear motor module comprises a secondary piston rod, a linear motor upper end cover, a linear motor lower end cover, a plurality of silicon steel sheets, a plurality of primary coils and a permanent magnet; the adjustable damping vibration absorber module comprises a vibration absorber piston rod, a sleeve, an upper lifting lug, a sealing separation plate, a big piston, a small piston, a damping liquid passage and a proportional electromagnetic valve; and an input end of the actuator controller is connected with an acceleration sensor, a sprung mass speed sensor and an unsprung mass speed sensor. The invention further discloses a control method for the multi-mode electromagnetic energy-regenerative vehicle active suspension actuator. The invention is advantaged in that the energy-regenerative efficiency of the multi-mode electromagnetic energy-regenerative vehicle active suspension actuator is high, the service life of a vehicle-mounted storage battery can be effectively prolonged and an active suspension is in an optimal vibration absorbing state.

The invention discloses a novel intelligent shock absorber integrating multilayer magnetorheological elastomers with a magnetorheological damper. The shock absorber comprises the magnetorheological damper and a variable stiffness device comprising the multilayer annular magnetorheological elastomers and magnetorheological elastomer magnet exciting coil windings mounted between the multilayer annular magnetorheological elastomers respectively, wherein the magnetorheological damper comprises a cylinder barrel; the cylinder barrel is connected to the top end of the shock absorber through a spring; a piston plate is arranged in the cylinder barrel; a piston rod is fixedly connected to the lower side of the piston plate; the other end of the piston rod penetrates out of the cylinder barrel and is fixed at the bottom end of the shock absorber; a magnetorheological damper magnet exciting coil winding is wound on the side wall of the piston plate; the cylinder barrel is filled with a magnetorheological fluid; a damping device is connected with the variable stiffness device in parallel or in series. Due to the integration of the multilayer magnetorheological elastomers and the magnetorheological damper, the stiffness and damping change range of the shock absorber is relatively large, a relatively good shock absorption effect can be achieved, and the shock absorber is compact in structure.

The invention discloses a hydraulic damper with adjustable damping. The hydraulic damper is arranged on an automobile. A hydraulic loop d is connected between an upper oil cavity b and a lower oil cavity c. An oil pressure cavity is arranged on the hydraulic loop d and comprises an oil pressure chamber, a piston valve core and two springs. The piston valve core and the two springs are arranged in the oil pressure chamber. The piston valve core divides the oil pressure cavity into a chamber e and a chamber f. Two through holes are formed in the piston valve core. The front end of a pipeline d1 is connected with the upper oil cavity b, and the tail end of the pipeline d1 is connected with the oil pressure cavity and is connected with a pipeline d3 in a bypass mode. The pipeline d3 is connected with the chamber f. A pipeline d6 is connected with the chamber f and the lower oil cavity c. The front end of a pipeline d5 is connected with the lower oil cavity c, and the tail end of the pipeline d5 is connected with the oil pressure cavity and is connected with a pipeline d4 in a bypass mode. The pipeline d4 is connected with the chamber e. A pipeline d2 is connected with the chamber e and the upper oil cavity b. Pressure difference between the two ends of the oil pressure chamber is used for pushing the piston valve core to move, so that the communication area of an oil pipe and the piston valve core is changed, the speed of oil liquid is changed when the oil liquid passes through the piston valve core, so that damping is changed, and accordingly a damping value is automatically adjusted according to road conditions in real time.

This invention is in structure tremble isolation and vibration control field, consists of upper connective tabulae, lower connective tabulae, rubber tile, steel plate, protective layer. Its characteristics are: steel plate and rubber tile are at superposition position; there is a hole in central part of steel plate; rubber tile has zonal shape; there is space in between steel plate and rubber tile; there is a liquid injection hole in the central part of uper connective tabulae; liquid injection hole is connected with through hole formed in the middle of abutment, and sealed with sealing thread plug; electricorheological fluids is full of the space formed in between steel plate and rubber tile; leadwire from end of steel plate is used to conenct with control divices providing control signals. In this invention, horizontal stiffness and damping characteristic sof abutment can be adjusted real time, this invention has strong pressurization capability, good deformability, good resilience capability, good energy consumption ability, and is applicable for the applications, where the existing superposition rubber abutment is used.

The invention discloses an electromagnetic suspension ball system with an acceleration detection function, and a control method thereof. In the system, an eddy current gap sensor collects a suspensiongap signal value and sends the same to a suspension controller; an acceleration sensor and a wireless transmitting unit are arranged in a steel ball, the acceleration sensor collects an accelerationvalue of the steel ball and sends the same to a suspension controller through the wireless transmitting unit and a wireless receiving unit; a current sensor detects a current signal of an electromagnet and sends the same to the suspension controller; and the suspension controller determines the magnitude of the current to be output according to the received suspension gap signal value, the acceleration data and real-time of the current signal, and then adjusts the winding current of the electromagnet through a chopper to change the magnitude of an electromagnetic force, so that the steel ballis suspended at a given suspension gap. The electromagnetic suspension ball system disclosed by the invention improves the suspension performance of the suspension system, increases the dynamic stiffness of the system, changes the damping and the vibration frequency of the system, and improves the anti-interference ability and the suspension stability of the system.

The invention discloses a two-stage vibration attenuation hydro-electric type active suspension with adjustable additional rigidity and damping and a working method, and belongs to the field of automobile suspensions. The suspension is composed of a first-stage vibration attenuation structure composed of an active force actuator and a spiral spring and a second-stage vibration attenuation structure with adjustable damping rigidity. The main power actuator comprises an actuator hydraulic cylinder, an oil supplementing energy accumulator, a hydraulic pump/motor and a motor/generator, and the second-stage vibration reduction structure comprises a spring hydraulic cylinder, an adjustable throttle valve, a spring energy accumulator, an electromagnetic valve and an air storage tank. The main power actuator is connected with an oil-gas spring in series. The suspension is provided with primary vibration reduction formed by the main power actuator and the spiral spring and secondary vibration reduction formed by the hydro-pneumatic spring, so that the associated inertia force of equivalent inertia mass of the primary vibration reduction structure is effectively reduced, the working states of the adjustable throttle valve and the electromagnetic valve can be conveniently adjusted according to the load state of an automobile, and the service life of the suspension is prolonged. And the rigidity and damping of the second-stage vibration reduction structure are changed.

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 self-powered type vehicle active suspension which comprises an actuator, a spring, a power module circuit, a super capacitor and a controller; the actuator and the spring are arranged between a vehicle body and a vehicle bridge in parallel; the input end of the controller is connected with a sprung mass speed sensor and an unsprung mass speed sensor; the actuator is composed of a piston barrel, a linear motor unit, a variable damping unit, an upper lifting lug, a lower lifting lug, a piston barrel upper end cover and a piston barrel lower end cover; the linear motor unit is composed of a piston rod and a plurality of permanent magnets; a partition plate is arranged in the piston barrel; a plurality of silicon steel sheets and a plurality of primary windings are arranged in the piston barrel between the piston barrel upper end cover and the partition plate; the variable damping unit is composed of a piston and a damping liquid channel; and a plurality of proportional electromagnetic valves are arranged on the damping liquid channel. The invention also discloses a coordinated control method of the self-powered type vehicle active suspension. The self-powered type vehicle active suspension is high in working stability, reliability, energy reclaiming efficiency and real time and can be in the optimal vibration attenuation state.

The invention discloses a variable-stiffness variable-damping vibration absorber based on characteristics of a magneto-rheological fluid. According to the vibration absorber, the characteristics of the magneto-rheological fluid are changed through vibration data detected by a vibrating sensor, therefore, the stiffness and the damping of the vibration absorber are changed to realize the adjustment of natural frequency of the vibration absorber, and a best vibration absorption effect is achieved. The vibration absorber is good in vibration absorption effect, and can perform a good vibration absorption function under a fixed vibration frequency; the natural frequency of the vibration absorber is adjustable and can be adjusted according to different excitation frequencies so as to achieve the best vibration absorption effect; during a vibration process, the natural frequency of the vibration absorber is adjusted continuously through the detection of the sensor, and real-time tracking is achieved to ensure that the best vibration absorption effect is maintained during the vibration process; due to semi-active control, the consumed outside energy is little; the vibration absorber is simple in structure, easy to achieve and high in feasibility; and combination use is facilitated, and a plurality of vibration absorbers can be combined and used for multi-frequency vibration.

The invention discloses an electromagnetic integrated type energy feedback suspension actuator of an electric vehicle and a control method of the electromagnetic integrated type energy feedback suspension actuator of the electric vehicle. The suspension actuator comprises a magnetorheological damper, a linear motor and an actuator monitoring device, wherein the magnetorheological damper comprisesa cylinder, a magnetorheological fluid, an inner chamber upper partition board and an inner chamber lower partition board, wherein the linear motor comprises a linear motor shell, a secondary part anda primary part; the actuator monitoring device comprises an actuator controller. The control method of the suspension actuator comprises the following steps: 1, data acquisition and transmission; 2,control of the suspension actuator by the actuator controller in an energy feedback mode, a primary damping mode, a secondary damping mode and an active mode according to sample data. The suspension actuator is reasonable in design, multi-mode switching of a suspension system can be realized according to different road conditions of vehicle traveling, energy waste of the electric vehicle is reduced, driving mileage of the electric vehicle can be increased, and the promotion and application values are high.

The invention relates to a damping cutter bar for turning coarse-pitch threads, and belongs to the field of machining. The damping cutter bar comprises a cutter bar shaft, a cutter bar shaft sleeve, an exciting coil, an upper permanent magnet, a lower permanent magnet, a piezoelectric ceramic piece, an end cover, a magnetorheological fluid and the like, wherein the exciting coil is wound on the cutter bar shaft, a coil lead of the exciting coil is connected with the piezoelectric ceramic piece, the magnetorheological fluid is injected into an annular cavity formed by the upper permanent magnetand the lower permanent magnet, and the piezoelectric ceramic piece is arranged in an annular cavity formed by the upper permanent magnet and the cutter bar shaft sleeve. According to the damping cutter bar, vibration can be suppressed when the coarse-pitch threads are turned, ever-changing current is generated by the piezoelectric ceramic piece due to cutting vibration and is transferred to theexciting coil through the coil lead, therefore, an ever-changing magnetic field can be generated by the exciting coil, so that the rigidity and damping of the magnetorheological fluid are quickly changed, the vibration reduction function is realized, and the surface quality of a to-be-processed workpiece is increased.

The invention relates to a belt collecting and winding machine structure. The belt collecting and winding machine structure comprises a support, a collecting barrel and a collecting driving mechanism, wherein the collecting barrel is arranged on the support, and the collecting driving mechanism controls the collecting barrel to rotate. The belt collecting and winding machine structure is characterized by further comprising a first roller, a first limit switch, a second limit switch, a second roller, an upper press plate, a lower press plate, a third roller and a fourth roller, wherein the first roller is fixed at a first end of a swing rod, the middle of the swing rod is rotationally arranged on the support, conveyed belts firstly wind on the first roller, the upper press plate and the lower press plate are fixed on the support, the lower press plate is arranged below the upper press plate and tightly arranged with the upper press plate, the third roller and the fourth roller are fixed on the support, the axis of the fourth roller is lower than the axis of the collecting barrel, and output ends of both the first limit switch and the second limit switch are connected with the collecting driving mechanism. Compared with the prior art, the belt collecting and winding machine structure can always guarantee constant tightness degree of belt winding.

The invention relates to a semi-active suspended type lightning protection shock absorbing seat. The semi-active suspended type lightning protection shock absorbing seat comprises a seat and a chair back; the seat is fixedly connected with the chair back through an arc fixing frame; lifting rods are vertically arranged on the two sides of the seat; the top of each lifting rod is detachably connected with the top of a vehicle body; bottom stopping sheets are detachably connected to the bottoms of the lifting rods and arranged perpendicular to the lifting rods; magnetic fluid rheostat adjustingmechanisms are arranged under the lifting rods; the upper ends of the magnetic fluid rheostat adjusting mechanisms are fixedly connected with the bottoms of the corresponding sides of the seat; sensors are arranged between the tops of the lifting rods and the top of the vehicle body; the sensors are electrically connected with a controller; the controller is electrically connected with a power supply generator; and the power supply generator is electrically connected with the magnetic fluid rheostat adjusting mechanisms. The semi-active suspended type lightning protection shock absorbing seathas the advantageous effects that the assembling and disassembling are convenient; the floor space is small; by using magneto-rheological characteristics of magnetorheological fluids, variable rigidity and variable damping can be realized to be convenient for effectively absorbing impact loads; active adaptation to different vibrational excitation is strong; and a very good protection effect on the safety of vehicle-mounted personnel is realized.

The invention relates to a polysiloxane microsphere damping chlorinated butyl rubber composite material and a preparation method thereof. The polysiloxane microsphere damping chlorinated butyl rubber composite material is prepared from the following components of 100 parts of chlorinated butyl rubber, 1 to 3 parts of vulcanizing agent, 1 to 3 parts of accelerant, 2 to 4 parts of stearic acid, 1 to 2 parts of nanometer zinc oxide, 2 to 4 parts of anti-aging agent, 1 to 3 parts of light-weight magnesium oxide, and 5 to 20 parts of polysiloxane microsphere; the components are added into a mixing mill to mix according to a formula, so as to obtain the polysiloxane microsphere damping chlorinated butyl rubber composite material. Compared with the prior art, the polysiloxane microsphere damping chlorinated butyl rubber composite material has the advantages that the chlorinated butyl rubber is modified by the polysiloxane microsphere, the damping temperature range is obviously widened, and the damping property, mechanic property and heat conduction property are improved.

The invention relates to a semi-active electric vortex laminated rubber support system composed of laminated rubber supports and a semi-active electric vortex damping system. The semi-active electricvortex damping system is composed of a fixed part, a permanent magnet, a data collection and analysis system, a magnetic conductive plate, an actuator, a bottom fixed plate and a conductor plate. Whenan earthquake occurs, the semi-active electric vortex damping system of the semi-active electric vortex laminated rubber support system can adjust the magnitude of the electric vortex damping force in real time according to the instantaneous frequency of an earthquake wave, the earthquake isolation effect of the electric vortex laminated rubber support system is strengthened, and the response ofan upper structure is reduced. Electric vortex damping replaces traditional viscous damping so that the stability and durability of a damper can be improved, and the design of the damper is simplified. The magnitude of the damping force of the semi-active electric vortex laminated rubber support system can be changed in the mode that the spacing distance between the conductor plate and the permanent magnet is changed by the actuator in real time so as to improve the earthquake isolation effect of the electric vortex laminated rubber support system.

The invention discloses a magneto-rheological damper used for installation and debugging of a helicopter high-definition camera, comprising a base, a coil and a magneto-rheological fluid; the base comprises a first connecting part connected with the camera and a second connecting part fixedly connected with a helicopter; the first connecting part comprises a first containing part used for containing the coil and a second containing part used for containing the magneto-rheological fluid; and the first containing part surrounds the periphery of the second containing part. The magneto-rheological damper is compact in structure, high in reliability and light in weight.

The invention discloses an assembly-type variable-damping variable-stiffness viscoelastic damper and an anti-seismic method thereof. The damper comprises two end viscoelastic damper bodies, the two end viscoelastic damper bodies are arranged coaxially, and a plurality of viscoelastic damper units are connected in series between the two end viscoelastic damper bodies in the axial direction of the two end viscoelastic damper bodies. Each end viscoelastic damper body comprises an end outer barrel and an end inner barrel. A viscoelastic material layer is arranged between the inner wall of each endouter barrel and the outer wall of the corresponding end inner barrel. Each viscoelastic damper unit comprises a unit outer barrel and a unit inner barrel. A viscoelastic material layer is arranged between the inner wall of each unit outer barrel and the outer wall of the corresponding unit inner barrel. Each end outer barrel and the corresponding unit outer barrel as well as the every two unit outer barrels are detachably connected to form a rigid outer barrel of the assembly-type variable-damping variable-stiffness viscoelastic damper. Each end inner barrel and the corresponding unit innerbarrel as well as the every two unit inner barrels are elastically connected through elastic connecting pieces.

The invention provides a seal type viscoelastic damper suitable for the on-orbit application of a spacecraft, mainly comprising a connecting screw bolt, an end face seal ring, a press plate, an outer housing, a shaft sleeve, a cover plate, a radial seal ring, a hollow central spindle, etc. The elastic material internally generates a shear action due to the relative movement between the shaft sleeve and the central spindle as well as between the shaft sleeve and the outer housing, so that the energy of mechanical vibration is converted into the shearing deformation energy of the viscoelastic material. The viscoelastic mechanical material is sealed in a sealed cavity, so that the quality loss or the gas discharge of the viscoelastic material can be avoided in the vacuum, and the obvious decrease of the damp performance and the possible pollution to the other optical equipment caused by the quality loss or the gas discharge can be avoided. The damper has the advantages of being simple in structural composition, reliable in sealing, free from space pollution, long in service life, wide in application range, convenient to install and operate, etc.

The invention discloses an active control closed-type hydrostatic guide rail belonging to the technical field of fluid transmission and control. Through the invention, the thickness of an oil film can be freely adjusted within a certain range and kept unchanged before and after encountering a loading force. The active control closed-type hydrostatic guide rail comprises a guide rail base which is provided with a guide rail movable component at the upper part, wherein a main hydrostatic cavity and an auxiliary hydrostatic cavity are arranged on the guide rail movable component. The active control closed-type hydrostatic guide rail is characterized in that the output end of a hydraulic pump is connected with the input ends of a first proportional flow valve and a second proportional flow valve respectively; the input end of an overflow valve is connected with the output end of the hydraulic pump; the input end of the hydraulic pump and the output end of the overflow valve are connected with an oil tank respectively; the output end of the first proportional flow valve is connected with the auxiliary hydrostatic cavity, and the output end of the second proportional flow valve is connected with the main hydrostatic valve; the control ends of the proportional flow valves are connected with a computer through a proportional amplifier respectively; and the output end of an electric vortex displacement sensor arranged on the guide rail movable component is connected with the computer through a data acquisition card.