32results about How to "Improve vibration control effect" patented technology

The invention relates to a drum-type omni-directional turned mass damper, belonging to the technical field of vibration resistance and absorption in structural engineering, and comprising a top cover,an outer-wall sleeve connected with the top cover, a sleeve-type structure arranged inside the outer-wall sleeve, an internal horizontal baffle and an external horizontal baffle. The sleeve-type structure comprises an inner-ring core cylinder, an outer-ring core cylinder, a steel ball holder and a steel ball, wherein the inner-ring core cylinder is arranged in the outer-ring core cylinder, the outer surface of the inner-ring core cylinder is fixed with the steel ball holder that is internally equipped with the steel ball. A viscous damper is connected between the outer-ring core cylinder andthe outer-wall sleeve, the lower end faces of the inner-ring core cylinder and the outer-ring core cylinder are both connected with the internal horizontal baffle via a universal rolling spherical hinge, and a spring is connected between the internal horizontal baffle and the external horizontal baffle which is further fixedly connected with a substructure. The damper can be operable for turning energy consumption and vibration damping in all directions of the structure, namely, two horizontal directions, vertical direction, and two directions of reversing and swinging.

The invention discloses a three-cylinder type large-capacity magneto-rheological damper for vibration control of a large civil engineering structure, which comprises a magneto-rheological damping cylinder (9), a puddle damping cylinder (5), an auxiliary cylinder (19), a magneto-rheological main piston (23), a puddle piston (6), a piston rod (17), a sealing baffle (20), a damping channel (16), a cylinder cover (3) and a spherical hinge joint (13), wherein magneto-rheological liquid (11) is filled in the magneto-rheological damping cylinder, and an annular excitation coil (8) capable of generating a magnetic field is arranged in the magneto-rheological damping cylinder; and the puddle damping cylinder is arranged adjacent to the magneto-rheological damping cylinder, and elastic puddle (7) is filled in the inner cavity of the puddle damping cylinder, thus the damper can generate large damping under the condition of large displacement, and the safety of the damper can be improved. By arranging a displacement splitting mechanism (18), the magneto-rheological damper has high rigidity and large damping in a low-frequency region and has low rigidity and small damping in a high-frequency region. Compared with the traditional magneto-rheological damper with the same size, the maximum capacity of the damper of the invention is improved by more than one time, and the vibration control of the large civil engineering structure is more effective.

There is provided a vibration isolator capable of, (1) vibration isolation performance for ground motion disturbance: vibration isolation for floor vibration, and (2) vibration control performance for direct acting disturbance: suppression of swing due to driving reaction force caused by stage movement, significantly improving the above (2), i.e., the vibration control performance, with keeping the above (1), i.e., the vibration isolation performance, at a high level.

A series-mechanism adjustable passive negative-stiffness damper comprises a positive stiffness and negative stiffness series mechanism, and a common damper; the positive stiffness and negative stiffness series mechanism includes a positive stiffness unit and a negative stiffness unit; the positive stiffness unit includes a mechanical spring and upper and lower connectors, two ends of the mechanical spring are fixedly connected to the upper and lower connectors respectively, so that it is ensured that the mechanical spring can bear pull reciprocating load; the negative stiffness unit includes an outer frame, two pre-compression springs, a guide rod and a slider, the lower end of the guide rod is fixedly connected to the bottom center of the outer frame, the slider sleeves the guide rod and can slide freely along the guide rod to integrally serially connect a damping unit and the positive stiffness and negative stiffness series mechanism, and it is possible to adjust stiffness without changing damping; the common damper is partially parallelly connected to positive stiffness or negative stiffness through structures, and it is accordingly possible to adjust the stiffness and damping. The series-mechanism adjustable passive negative-stiffness damper can provide improved aseismic effect for civil structures, especially super-large civil structures.

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 method and a device for controlling the vibration in an automobile hierarchical modeling manner. The method comprises the following steps: sending the data of eight vertical and lateral road roughness sensors to a CPU processor, integrating the hierarchical modeling algorithm and obtaining the motion state of the centroid of suspended mass, the constrained force of suspended mass, and acceleration predictive values obtained by predicting and decoupling the vertical and lateral acceleration variable quantities of No.1 to No.4 suspension brackets, through the operation; respectively transmitting to eight vertical and lateral matrix control quantity operation module of No.1 to No.4 units; obtaining theoretical quantity of controllable actuators of No.1 to No.4 units after the synthesis is conducted; conducting the conversion operation of actuating quantity because the data received by each actuator generates the corresponding action. The invention has the advantages that the hierarchical control architecture built on the basis of considering the common influence of the vertical excitation and the lateral excitation of the road is converted into eight four-multiplied-four matrix, so as to simultaneously conduct the control quantity operation of four controllable actuators and the vibration control, thereby reducing online operation time and reaching the optimum vibration control effect of the whole automobile.

The invention discloses a train automatic-parking executing system which comprises a servo motor, a driving beam, a driven beam, a turnout control relay, a trolley, a turnout structure with magnetic levitation plates and a turnout controller. The turnout structure with the magnetic levitation plates is arranged on the driven beam. The servo motor is mounted under the driving beam and connected with the trolley, the turnout control relay and the turnout controller. The driving beam and the driven beam are mechanically connected. The servo motor drives the trolley to drive the driven beam, underthe action of the driven beam, the turnout structure with the magnetic levitation plates, the driven beam and the driving beam are moved to a set rail as a whole, and thus a train runs to the set rail. An existing magnetic levitation rail structure is improved, levitating magnets are arranged in groove structures, airflow resistance is reduced, energy consumption of the magnetically levitated train is lowered, the safety guarantee capacity of magnetic levitation traffic is enhanced, and riding of magnetic levitation traffic is more quiet and comfortable.

The invention relates to a built-in damping vibration attenuation device. The built-in damping vibration attenuation device comprises a connecting cylinder and a damping set; the connecting cylinder is internally provided with a containing area used for containing a clamp for clamping a vibration attenuation target; the damping set is arranged in the connecting cylinder and comprises two hydraulic dampers, the two hydraulic dampers of the damping set are symmetrically arranged on the two sides of the containing area, cylinder barrels of the two hydraulic dampers contained in the damping set communicate with each other through a guide pipe, and piston rods of the hydraulic dampers are used for abutting against the clamp. Interconnection of the two opposite hydraulic dampers is achieved through the guide pipe, so that hydraulic inerter between the two hydraulic dampers of the damping set is achieved, negative rigidity is provided for the structure through the hydraulic inerter, and the vibration control effect of the structure can be greatly improved.

The invention discloses a fiber reinforced composite material anti-vibration hammer. The shockproof hammer comprises a line card and hammers. There are two hammers which are arranged on two ends of anelastic rod. A middle portion of the elastic rod is provided with a connection board forming an integral structure with the line card. The connection board is a composite material pultrusion sheet material. An elastic rod is a composite material pultrusion bar material. Each hammer is a complex body of structural steel and a composite material. A connection portion of each hammer and the elasticrod is the composite material. The connection portion of each hammer and the elastic rod is the structural steel. Each hammer is the structural steel whose external layer is wrapped with the compositematerial. The composite material is a fiber reinforced composite material. In the invention, through using the fiber reinforced composite material, problems that a capability for an existing vibration hammer to absorb energy of vibration is poor, the vibration hammer is easy to be oxidized, and a corrosion resistance capability is poor are solved; an eddy current is eliminated; and line energy consumption is reduced.

The present disclosure relates to a signal conditioning system for improving low-frequency measurement performance of an acceleration sensor. The signal conditioning system includes: a charge integration circuit, a high-pass filter circuit, a lead-lag network, an anti-aliasing filter circuit, and a gain adjustment circuit. An input terminal of the charge integration circuit is connected to the acceleration sensor, an output terminal of the charge integration circuit is connected to an input terminal of the high-pass filter circuit, an output terminal of the high-pass filter circuit is connected to an input terminal of the lead-lag network, an output terminal of the lead-lag network is connected to an input terminal of the anti-aliasing filter circuit, and an output terminal of the anti-aliasing filter circuit is connected to an input terminal of the gain adjustment circuit.

The invention discloses an acceleration feedback vibration control method for a flexible structure of a spacecraft. The method comprises the steps of obtaining a kinetic equation and a transfer function of the structure according to simulation modeling analysis or a structure test, then designing a controller based on acceleration feedback, introducing a second-order system compensator and a first-order system compensator, and configuring a damping parameter zetaf and a frequency parameter omegaf of the compensators, and finally, configuring feedback gains alpha and beta of the controller, and controlling output to add variables of the two compensators and perform negative feedback. Acceleration is used as a feedback physical quantity, so that error accumulation is avoided; a second-order system compensator is introduced, compensator variables are directly used as negative feedback, and the problem of high-frequency control overflow is solved through the low-pass filtering characteristic of the second-order system compensator; a first-order system compensator is added, and by configuring gain parameters of the two compensators, the problem that the control effect of a closed-loop control system is reduced due to time lag is solved, and the vibration control capability of the system is improved.

The invention discloses a vibration intelligent control parameter optimization method and system for a piezoelectric laminated beam, and the method comprises the following steps: S1, uniformly pasting piezoelectric ceramic pieces on the upper and lower surfaces of a piezoelectric laminated beam plate, analyzing a unit mass matrix and a stiffness matrix of the beam plate through a finite element method, and building a beam plate electromechanical coupling model; s2, analyzing the dynamic characteristics of a piezoelectric laminated beam plate according to the electromechanical coupling model of the beam plate, and optimizing a piezoelectric actuator through an improved particle swarm algorithm to control the vibration parameters of the corresponding beam plate; and S3, establishing a hysteresis model through a hysteresis compensation algorithm based on the optimization parameters of the piezoelectric actuator, optimizing the vibration parameters of the piezoelectric actuator, determining the position vector of the piezoelectric actuator, preventing the control overflow of an active controller, improving the vibration control effect, and realizing the linearization of actual input and actual output. The system compensation error can be accurately described, and the control precision in the active control system is improved.