38results about How to "Vibration suppression effect is obvious" patented technology

The invention relates to a multiple-consumption self-adaptive collision type tuned massed damper. The damper comprises a peripheral protection unit, a vertical vibration unit, a collision gap self-coordination unit and a suspension tuned massed damping unit, wherein the vertical vibration unit is fixedly arranged at the upper end of the peripheral protection unit; the collision gap self-coordination unit is arranged in an accommodating cavity, and the upper portion of the collision gap self-coordination unit is provided with a collision cavity; and the suspension tuned massed damping unit comprises an outer massed ball, an inner massed ball and a plurality of collision energy consumption heads, a spherical cavity is formed in the center of the outer massed ball, the outer massed ball is arranged in the collision cavity, and the upper end of the outer massed ball is connected to the vertical vibration unit through a connecting component; and the inner massed ball is suspended in the spherical cavity of the outer massed ball through elastic components. The multiple-consumption self-adaptive collision type tuned massed damper has the characteristics of multiple collision nonlinear energy consumption and excitation strength adaption, a high-rise building structure dynamic response suppression effect under an earthquake and wind load effect is remarkable, and the multiple-consumption adaptive collision type tuned massed damper is applicable to structures with limited spaces, is remarkable in vibration suppression effect and good in economic and social benefit.

The invention discloses a stay cable external damping and vibration reduction device, including stay cables, cable hoops, bolt connectors, dampers, upper brackets, pipe hoops, support frames, diagonal bracing pipes, top surfaces of box girders, stay cables PE The outer protective tube is fixedly sleeved with a cable hoop through a bolt connection. Two single clevises are arranged on the side of the hoop close to the damper. It is connected with the double clevis at the end of the upper bracket, and the two dampers are symmetrically distributed to form an isosceles triangle with the upper bracket, and the damper is perpendicular to the center line of the stay cable; the middle part of the upper bracket passes through the bolt connection of the pipe collar In the flexible sleeve pipe hoop, the pipe hoop is welded to the top of the support frame, and the diagonal bracing pipe is fixedly connected to the upper part of the support frame through a pin; form a triangular support structure. Stay cables with simple structure, convenient installation, and adaptable to all angles.

The invention discloses an active inhibition device and method for band-saw blade vibration on the basis of master vibration modal prediction. The device is used for real-time sampling, analysis and eigenvalue extraction for transverse, longitudinal and torsion-directional multi-dimensional vibration of a band-saw blade, is used for master vibration modal prediction on the basis of real-time vibration characteristics of the band-saw blade, and is specially designed for high-speed response on the basis of band-saw blade master vibration modal recognition and prediction feedback. The device is capable of displaying vibration amplitude of the band-saw blade in real time, is applicable to all band saws each having an oil source, and is capable of significantly inhibiting the vibration of the band saw.

The invention relates to an attached mounting type miniature compound dynamic vibration absorber and belongs to the technical field of noise vibration control. The attached mounting type miniature compound dynamic vibration absorber comprises an elastic base, assembling supports, elastic films, a mass block and connecting pieces for assembly of the compound dynamic vibration absorber. The elastic base and the two assembling supports form a body of the compound dynamic vibration absorber. The elastic base is of a rubber type cylinder structure. The two assembling supports are arranged and are each of a metal-pipe-shaped structure with a certain height. One of the assembling supports is connected with the elastic base through the connecting pieces. The elastic films and the mass block form vibration absorbing elements of the dynamic vibration absorber, the two vibration absorbing elements are arranged, one of the vibration absorbing elements is located between the two assembling supports and is connected with the two assembling supports through the elastic films, and the other vibration absorbing element is located at the top end of the dynamic vibration absorber and is connected with the assembling supports through the connecting pieces. By the adoption of the attached mounting type miniature compound dynamic vibration absorber, the low frequency and broadband vibration suppression and noise reduction can be achieved, and the vibration suppression and noise reduction performance can be further enhanced when mounting dynamic vibration absorbers are distributed periodically.

The invention provides a flexible truss structural vibration active suppression system and method based on piezoelectric materials. The system comprises a main supporting rod fixed to the ground, a flexible transverse rod and flexible diagonals located on the two sides of the flexible transverse rod are fixed to the main supporting rod, an installation clamp is fixed to the main supporting rod, the other end of the installation clamp is connected with the end, on the short shaft side, of a rhombic actuator through a first rigid rope, the other end of the short shaft side of the rhombic actuator is connected with a positioning clamp fixed to one flexible diagonal through a second rigid rope, the length direction of the first rigid rope, the length direction of the second rigid rope and the length direction of the positioning clamps are located on the same straight line and perpendicular to the flexible diagonals, and the other end of the flexible transverse rod and the other ends of the flexible diagonals are connected with the body of a flexible truss structure. The invention further provides the control method of the flexible truss structural vibration active suppression system. According to the flexible truss structural vibration active suppression system and the control method of the flexible truss structural vibration active suppression system, the inverse piezoelectric effect of a piezoelectric stack is utilized to output micro displacement and large control force, a rhombic displacement amplification mechanism is used for amplifying output displacement, control is applied to the flexible truss structure, and vibration active suppression of the flexible truss structure can be achieved.

The invention belongs to the field of active vibration control of an aircraft wind tunnel model, and provides a model-adaptive vibration active suppression method. The method first obtains the open-loop frequency response and natural frequencies of each order by performing sinusoidal sweep frequency excitation on a model support system. Secondly, the vibration signals in the time domain are separated to obtain the vibration modes of the system, and the transfer function of the system is identified. Finally, the control parameters are adjusted based on the identified model parameters, and the optimal control parameters are obtained to realize the active vibration suppression of the model. The method provided by the invention can adaptively adjust the control parameters according to the characteristics of different types of aircraft model systems, so as to realize rapid and effective suppression of the vibration of multiple types of models, with strong adaptability and high accuracy.

The invention discloses a rotor system dynamic vibration absorber utilizing a nonlinear energy well mechanism. The rotor system dynamic vibration absorber comprises a vibration absorber body and a supporting component fixing device; the vibration absorber body comprises a supporting component, a connection component and a vibration absorber mass block; the supporting component comprises a bearing,a support and a shaft sleeve; the connection component comprises nuts, connection rods and piecewise linear rods; the piecewise linear rods form a piecewise linear stiffness and fit nonlinear cubic stiffness; connection holes and interstitial holes are formed in the vibration absorber mass block to form matching with the connection component; the vibration absorber mass block is in clearance fitting to the piecewise linear rods to form the nonlinear energy well mechanism; and the supporting component fixing device comprises bolts, fixed frames, springs and connection sheets. The rotor systemdynamic vibration absorber utilizing the nonlinear energy well mechanism can effectively inhibit vibration of a rotor system broadband, belongs to the field of vibration noise control, is compact in whole structure, small in additional mass, high in reliability and convenient to use and does not need to provide energy by the external.

An elastic supporting structure for damping a ball screw pair belongs to the field of vibration control of ball screw pairs, and comprises a squirrel-cage elastic sleeve (1), metal rubber gaskets (2), metal rubber rings (3) and outer sleeves (4). The elastic supporting structure is connected with a nut and a nut seat of the ball screw pair. On the premise of ensuring the axial rigidity, the radial connecting rigidity between the nut and a worktable is reduced. Through the reasonable design of the radial rigidity of the elastic supporting structure, the radial inherent frequency of a screw is improved, the variable range of the radial inherent frequency of the screw, which is caused by nut movement, is reduced, the radial dynamic characteristic of the screw is improved, and the critical speed of revolution of the ball screw pair is increased. A metal rubber damping material is arranged in the elastic supporting structure, so that the radial vibration of the ball screw pair is further inhibited. The density and the rigidity of metal rubber are reasonably selected so as to optimize the vibration inhibition effect, the operation performance of the ball screw pair is improved, and the operation noise is reduced. The elastic supporting structure is applied to ball screw pairs of different types and different working conditions.

The invention discloses a method for determining the parameters of a double-helix hot-extruded polyethylene semi-parallel cable-stayed cable, which belongs to the field of cable-stayed bridges. Wind the raised double helix on the outer surface of the stay cable in the same direction, determine the diameter d of the helix and the winding distance S of the same helix according to the wind tunnel test, and find out the double helix winding with the stay cable of different diameter line, the combination of parameter values ​​with the smallest aerodynamic resistance under the premise of suppressing wind and rain vibration; where, S is the multiple of the diameter D of the stay cable. The invention not only can suppress the wind and rain vibration, but also has the best aerodynamic resistance.

The invention relates to a vibration absorbing device and particularly relates to a nonlinear vibration absorber provided with segmented linear rods. The nonlinear vibration absorber provided with thesegmented linear rods comprises a shaft sleeve, a fastening screw, a connecting rod, the segmented linear rods and a mass block; the shaft sleeve is fixedly connected to a rotor through the fasteningscrew; the mass block is of a disc structure; the mass block is provided with a center hole and four circular holes, wherein the four circular holes are different in diameter and are uniformly distributed in the circumference; the mass block is installed on the rotor in a sleeving manner; the mass block is fixedly connected with the shaft sleeve through the connecting rod; the segmented linear rods are four rigid rods which are different in diameter; one end of each segmented linear rod is fixedly connected with the shaft sleeve; and the other end of each segmented linear rod is placed insidethe corresponding circular hole and keeps a clearance with the corresponding circular hole. The nonlinear vibration absorber provided by the invention is simple in structure, restrains vibration frequency band width and achieves a remarkable effect.

The invention discloses an active vibration control system of a flexible structure based on a voice coil motor and a method thereof, wherein the system comprises a main support rod fixed on the ground, a rail is fixed on the main support rod, left and right oblique rods on both sides of the rail are symmetrically fixed to the main support rod, left and right large displacement actuators adjacent to the left and right oblique rods are fixed on both sides of the main support rod when the rail is as a symmetry axis, both sides of the other end of the rail are symmetrically fixed with stationary fixtures on which fixed pulleys are mounted, and the top of the rail is provided with the flexible structure; the other ends of the left and right oblique rods are connected with positioning fixtures on which hole bolts are mounted, the fixed pulleys, the hole positions of the hole bolts and the left and right oblique rods are located on the same plane, and a rigid rope passes through the left large displacement actuator, the fixed pulleys and the holes of the hole bolts; besides, the invention further discloses a control method of the system; the active vibration control system outputs large displacement and greater control force through the voice coil motor, a control direction is shifted by the pulleys such that the active modal vibration control of the flexible structure can be realized.

A nonlinear energy sink (Nonlinear energy sink, NES) with a segmented linear beam applied to a rotor system of the present invention includes an NES frame, a plurality of leaf springs and a plurality of mass blocks, and one end of the leaf spring is connected to the NES frame , the other end is correspondingly connected to a mass block, and a plurality of leaf springs are evenly arranged. In the present invention, the cubic stiffness beam is equivalently replaced by a segmented linear stiffness beam. The fitting accuracy of the nonlinear energy well to the cubic stiffness is high, and the change of the segmental linear stiffness is related to the vibration displacement of the system. By changing the segmented linear beam and The gap between the mass blocks can effectively change its nonlinearity; the nonlinear energy well allows the energy of the system to be damped to be transmitted to the outside of the system through the nonlinear energy well for consumption. Its structure is simple and compact, and its design is reasonable. The effect is remarkable.