41results about How to "Damping force adjustment" patented technology

The invention discloses a semi-active energy regenerative suspension shock absorber based on mixed excitation and a size determining method of the shock absorber. The shock absorber comprises an upper hoisting lug, a dust cover, a lower hoisting lug, a hydraulic shock absorber body and a mixed excitation mechanism. The hydraulic shock absorber body provides the constant viscous damping coefficient. The mixed excitation mechanism provides the adjustable electromagnetic damping force and converts vibration energy into electric energy for storage. Meanwhile, the invention provides the size determining method. The model selection of the hydraulic shock absorber body is determined according to the rating requirements, an electromagnetic damping force expression is derived, the primary size of the mixed excitation mechanism is determined through a particle swarm optimization algorithm, finite element analysis is conducted, the gas length is optimized, and the final size is determined. According to the shock absorber and the size determining method, the hydraulic shock absorber body and a mixed excitation cylindrical linear motor are integrated, the damping force is adjustable, energy is recovered in the working process, the structure is simple, the shock isolation performance and the energy regenerative performance of a vehicle suspension are coordinated, and the Fail-safe function is also achieved; and in addition, the size determining method is clear in step, easy to implement and obvious in optimization result, and has high practicalness.

The present invention is cylinder induction type self sensing method and system for MR damper. One induction coil is wound onto the cylinder of single-cylinder piston type MR damper and excited with the harmonic magnetic field of the exciting coil wound on the piston head of the MR damper to output information of relative displacement state between the piston rod and the cylinder, and this constitute the basic structure of cylinder induction type integrated relative displacement sensor. One active magnetoelectric relative displacement sensor is integrated to the MR damper structure to realize the real-time detection of relative displacement information between the controlled target and the supporting body. The continuous damping force controlling characteristic of magnetic reological fluid damper is combined to make the semi-active damping system of MR damper possess continuously controllable self sensing and damping force.

The invention relates to a rotating plate type magneto-rheological shimmy damper for a landing gear of an aircraft comprising a cylinder tube, end caps, stator assemblies and a rotor assembly, wherein the end caps are coaxially and hermetically mounted at both ends of the cylinder tube; each stator assembly is fixedly and symmetrically mounted in the part of the cylinder tube inside the corresponding end cap; a drive shaft is coaxially arranged in the cylinder tube between the two stator assemblies in a running-through manner; the drive shaft in the cylinder tube is provided with the rotor assembly and drives the rotor assembly to rotate in the cylinder tube; and one end of the drive shaft is provided with a double rocker mechanism. The rotating plate type magneto-rheological shimmy damper for the landing gear of the aircraft is a semi-active shimmy control device which is capable of guaranteeing a minimum damping under zero magnetic field conditions and increasing the adjustment range of damping force of the shimmy damper, and has the advantages of simple structure, low energy consumption, small size, fast response and continuously adjustable direction of the damping force in a large range; and the same overcomes the problems of unmeasured state feedback quantity, large energy consumption of active control force, time delay and spillovers of a traditional passive damper in the prior art, and is useful as an actuator for structural shimmy control.

The invention provides a three-dimensional seismic mitigation and absorption platform for free standing object protection. The platform comprises a base plate, a rubber seat, a resetting spring, a vertical guide shaft support, a transverse guide shaft thick support, a transverse guide shaft thin support, a vertical damper unit, a transverse damper unit, an object placing plate, a connection shaft fixing clamp, a connection shaft, a transverse resetting spring short brace, a transverse resetting spring long brace, a vertical resetting spring short brace and a vertical resetting spring long brace. The three-dimensional seismic mitigation and absorption platform is compact in structure, has initial rigidity, is capable of achieving horizontal acceleration and displacement control of free standing objects under the effect of seism of different seismic levels by adjusting the damping force in the horizontal direction and capable of restraining vibration in the vertical direction, and enables the free standing objects to return to the initial position after the seism is finished.

The invention provides an automobile damping device, belongs to the technical field of damping, and solves the problems that performances of a damper cannot be flexibly regulated and temperature of an oil liquid rises quickly during frequent vibration. The automobile damping device comprises a piston hydraulic damper, wherein the bottom of a cavity of the piston hydraulic damper communicates with a liquid inlet end opening of a Tesla turbine; the upper part of the cavity of the piton hydraulic damper communicates with a liquid outlet end opening of the Tesla turbine; one end of a turbine shaft of the Tesla turbine is connected to a motor; and fan blades are arranged on a turbine shaft at the other end. According to the automobile damping device provided by the invention, the damper is combined with the Tesla turbine, so that regulation on damping force of the damper can be realized through rotation of the motor; and the fan blades are arranged on the Tesla turbine, so that the oil liquid can be cooled by utilizing vibrating energy of the damper.

The invention discloses a small viscous damper which comprises a damping box body, a connection plate and shearing plates, wherein the top of the damping box body is provided with an opening, the bottom of the damping box body is provided with a connection bottom plate connected with a lower layer building structure, a plurality of adjustable baffles are inserted on the two sides of the inner wall of the damper, a plurality of shearing areas which are vertically arranged can be formed on the two sides of the interior of the damping box body, and the shearing areas are filled with damping filler; the upper end of the connection plate is provided with a connection top plate connected with the upper layer building structure, and the lower end of the connection plate penetrates through the opening and is inserted into the damping box body; the first end of each shearing plate is connected with the connection plate, and the second end of each shearing plate is inserted into the damping filler in the shearing areas. According to the small viscous damper, multiple layers of the shearing plates are inserted into the damping box body through the connection plate, multiple layers of shearing faces are formed, and larger damping force is guaranteed under the situation that the appearance size of the damper is reduced.

In an ultra-low velocity region of piston velocity in a contraction stroke in a soft mode, communication between a cylinder upper chamber and a reservoir is shut off by means of an ultra-low velocity valve (low velocity valve mechanism) disposed in a pilot passage. By this means, liquid oil in the cylinder upper chamber can be caused to expand in the ultra-low velocity region of the contraction stroke, and a differential pressure is generated between the cylinder upper chamber side and a cylinder lower chamber side of the contraction side ultra-low velocity valve. As a result, the contraction side ultra-low velocity valve opens in the ultra-low velocity region, and a valve characteristic damping force due to the ultra-low velocity valve can be generated.

The invention relates to a single-action magneto-rheological shock absorber for aircraft landing gear, comprising an outer cylinder, an inner cylinder, a piston rod, a piston assembly and a wheel shaft base, and the top of the outer cylinder is coaxially sealed and installed End cover, the lower end of the outer cylinder is coaxially slid to install the inner cylinder, the lower end of the inner cylinder is threaded to install the wheel shaft base, the inner and outer cylinders are coaxially installed with the piston rod, and the upper end of the piston rod is fixed to the end cover Together, the lower end of the piston rod mounts a piston assembly whose outer edge is in frictional contact with the inner wall of the inner cylinder. On the basis of the existing aircraft landing gear buffer structure, the present invention adds a piston assembly that can apply magneto-rheological fluid technology, so that the shock absorber has simple structure, low energy consumption, small volume, fast response, and its output damping force can be continuously changed. Adjustable and reversible, the closed-loop semi-active control is realized by combining with computer, optimized control algorithm, sensor, controller and power supply, which improves the buffering efficiency and shock absorption effect of the shock absorber.

The invention provides a vibration reduction system and a vibration reduction method for coupling vibration of a tower crane and a cable tower. The vibration reduction system for the coupling vibration of the tower crane and the cable tower comprises a tower machine (10) and a cable tower (20), wherein the tower machine (10) is connected with the cable tower (20) through an attaching device (30);and the attaching device (30) comprises a variable damping actuator. According to the vibration reduction system for the coupling vibration of the tower crane and the cable tower, effects of damping energy consumption and vibration reduction can be passively exerted, an effect of vibration control can be actively exerted, the coupling vibration of a tower crane-cable tower structure is greatly reduced, and the stability and the safety of the tower crane-cable tower structure are improved.

In a third passage, a compression-side ultra-low velocity valve, which allows oil liquid to pass through from a bottom chamber (second chamber) of a cylinder to a top chamber (first chamber) thereof, is disposed so as to be parallel to an extension-side ultra-low velocity valve. This can expand oil liquid in the top chamber (first chamber) in an ultra-low velocity zone of a compression step, which causes a differential pressure between the top chamber side and the bottom chamber side (second chamber) in the ultra-low velocity valve on the compression side (fifth low-velocity valve). As a result, the ultra-low velocity valve on the compression side opens in the ultra-low velocity zone, which can cause a damping force of a valve characteristic of the ultra-low velocity valve.

The invention discloses a linear damping type constant-rigidity vibration isolator for gas and belongs to the field of isolators. The isolator includes a housing, an end cover A, an end cover B and acombined piston module, wherein the end covers A and B are installed at the two ends of the housing, and the combined piston module is installed in the housing; the combined piston module includes a cylinder body, a piston capable of sliding freely in the cylinder body, a piston rod installed on the piston and a baffle installed on the piston rod; one end of the piston rod penetrates through a liner bearing on the end cover B and extends to the outer side of the end cover B. The vibration isolator also includes metal spiral springs which are installed at the two ends of the piston rod and connected with the baffle and the end cover B respectively; the cylinder body is a thin-wall drum with two porous ends, one end of the cylinder body is fixedly installed on the end cover A, and the otherend of the cylinder body is installed in the housing; a chamber, between the piston and the end cover A, of the interior of the cylinder body is filled with compressible gas. The linear damping type constant-rigidity vibration isolator for gas can increase damping.