30results about How to "Good vibration suppression effect" patented technology

The invention discloses a tuned passive damper with two degrees of freedom. The tuned passive damper with the two degrees of freedom comprises mass blocks, sliding blocks, elastic-damping units and rigidity adjusting bolts; grooves are formed in the two ends of each mass block, every two sliding blocks are arranged in one groove and are tightly attached to a thin plate in the corresponding elastic-damping unit, and each thin plate is provided with a sliding groove corresponding to the groove in the corresponding mass block. Each sliding block is located by the corresponding rigidity adjusting bolt penetrating through the corresponding groove and the corresponding sliding groove, so that the distance between the two sliding blocks on the same side of each mass block is adjusted through the corresponding bolts, and rigidity adjustment of the damper is achieved. Besides, a friction plate with the adjustable angle is arranged between the corresponding sliding blocks and the side wall of a base of the corresponding elastic-damping unit, the contact area between each friction plate and the corresponding mass block is changed by adjusting the angle of the corresponding friction plate, and therefore the damping ratio of the damper is adjusted. The tuned passive damper with the two degrees of freedom has the advantages of being simple in structure, convenient to implement and low in cost, having no pollution to the environment, being capable of effectively lowering vibration in a cutting process, and achieving high-efficiency and high-quality machining of parts.

The invention discloses a wind generating set tower capable of automatically adjusting damping properties. The wind generating set tower comprises a tower structure, an inner layer supporting shell structure, an air pump and a control system; the top end and the bottom end of the inner layer supporting shell structure are respectively connected with the inner wall of the tower structure to form aclosed damping cavity; damping liquid is injected into the damping cavity; a plurality of inflating bags connected with the air pump are arranged at the bottom in the damping cavity, and exhaust holesare arranged in the top of the damping cavity; an acceleration acquisition system is arranged on the tower structure; and the control system is connected with the acceleration acquisition system andthe air pump and is used for controlling the air pump to adjust the volume of the inflating bags according to the acceleration measured by the acceleration acquisition system so as to change the height of the damping liquid in the damping cavity. According to the wind generating set tower, the frequency of liquid damping can be accurately adjusted according to the actual vibration condition of thetower so as to achieve the optimal vibration suppression effect. The height of the damping liquid does not need to be adjusted manually, and the risk caused by damping adjustment deviation is reduced.

The invention relates to a multi-stable nonlinear energy well with a piecewise linear beam and permanent magnet negative stiffness. The multi-stable nonlinear energy well comprises the piecewise linear beam which is composed of three piecewise linear rods with different stiffness. One end of the piecewise linear beam is fixed to a piecewise linear beam pedestal, and the other end of the piecewiselinear beam is inserted into an MNES mass block. During installation, a certain pre-compression amount is reserved between the piecewise linear rods of the two sides and the MNES mass block. A gap isreserved between the piecewise linear rod in the middle and the MNES mass block. Along with up-and-down movement of the MNES mass block, the compression amount between the MNES mass block and the piecewise linear beam is changed, and piecewise linear positive stiffness is produced. The required negative stiffness is produced through inner magnets and outer magnets, and required multiple stable positions are constructed through the optimal cooperation of the positive stiffness and negative stiffness. Vibration energy of a to-be-damped system is transmitted into the energy well in a unidirectional mode, and finally the energy is rapidly dissipated through damping by the energy well, and thus main system vibrations can be efficiently restrained. The energy well is simple in structure, wide invibration suppressing frequency band and remarkable in vibration suppressing effect.

The invention provides a fixed-frequency nonlinear rubber vibration isolator for a floating slab track and a design method. It is guaranteed that in an empty vehicle state, a floating slab track bed has the same vibration isolation performance and the unchanged inherent frequency as those in a heavy vehicle state, the track vertical displacement in the heavy vehicle state is effectively restrained, and the system safety is guaranteed. The fixed-frequency nonlinear rubber vibration isolator comprises a base 1, a conic rubber pile, an upper supporting seat, a heightening cushion board and a locking screw, the top face of the base is attached to the inner conic face of the conic rubber pile, and the bottom face of the upper supporting seat is attached to the outer conic face of the conic rubber pile. The conic rubber pile comprises an inner conic steel disc, an outer conic steel disc and at least one layer of conic rubber body located between the inner conic steel disc and the outer conic steel disc and fixedly connected with the inner conic steel disc and the outer conic steel disc. Each conic rubber body is composed of conic rubber ring units arranged along the conic faces of the inner conic steel disc and the outer conic steel disc at intervals. Each conic rubber ring unit is provided with an exhausting channel communicating with the outer side of the vibration isolator.

The invention discloses an intelligent support sliding bearing device with adjustable clearance and a clearance adjustment method. The intelligent support sliding bearing device comprises a support sliding bearing, an inclined block is arranged under the support sliding bearing, a guide rail is arranged under the inclined block, the bottom surface of the inclined block is matched with the guide rail in a sliding mode, the inclined block moves in the axial direction of the guide rail, the top surface of the inclined block is an inclined plane with a taper of 1 to 125, a pushing mechanism is arranged at one end of the inclined block, the other end of the inclined block is connected with a reset spring, and a vertical displacement sensor and a horizontal displacement sensor are respectively used for detecting the vertical radial displacement and the horizontal radial displacement of a rotor; the vertical displacement sensor and the horizontal displacement sensor are connected with the input end of a monitoring controller, and the output end of the controller is further connected with the control signal input end of a servo motor; when the rotor vibration is too large, signals collected by the sensors are sent to the controller, the controller controls the servo motor to make a certain action, and the clearance between the bearing and the shaft neck is changed, so that the elliptical bearing play a role, the rotor amplitude is reduced, and the whole system has a good effect of vibration reduction and suppression.

The invention relates to an FxLMS filtering method for a narrow-band active vibration system. A vibration signal d (n) is obtained by using a non-acoustic sensor at a system input terminal and a reference signal x (n) is generated based on the vibration signal d (n); a variable-power swept-frequency signal is adopted in secondary channel identification; after the reference signal x (n) is filtered, FXLMS algorithm weight iterative calculation is performed by combining a residual signal e (n) to obtain a vibration suppression signal y (n); and the vibration suppression signal y (n) and a secondary channel input signal v (n) are superposed and the superposed signals are subtracted from a low-frequency harmonic vibration signal d (n) to realize vibration suppression. Compared with the commonwhite noise of the classical FXLMS algorithm, the swept-frequency signal with concentrated energy distribution can obtain a high-quality measurement result in a frequency range of a narrow-band activevibration suppression system. The residual error of the whole narrow-band active vibration suppression system can be reduced. The method has the advantages: a stable secondary channel modeling valuecan be obtained in the synthesized frequency range for the narrow-band active vibration suppression system; the system residual error is reduced; and a better vibration suppression effect is realized.

The invention discloses a submarine pipeline capable of restraining vortex-induced vibration. The submarine pipeline is formed in the mode that the cross section of the lower end of a pipeline body is pulled upwards in a spiral mode through the center axis in the axial direction, the outer boundary of the cross section of the lower end is formed by end-to-end connection of six 60-degree arcs in the tangential direction, the six 60-degree arcs are the arc a, the arc b, the arc c, the arc d, the arc e and the arc f in sequence in the clockwise rotation direction, the line connecting the circle center O1 of the arc a with the central point O of the lower cross section, the line connecting the circle center O2 of the arc c with the central point O of the lower cross section, and the line connecting the circle center O3 of the arc e with the central point O of the lower cross section are in the same length, and the included angles between the three lines are 120 degrees; a circle with a radius of R=O1O2+O1A is made to be tangent to the circle O2 and the circle O3, O1A is the radius of the arc a, the arc between tangent points is the arc d, and O2 serves as the circle center; a circle with a radius R is made to be tangent to the circle O1 and the circle O3, and the arc between tangent points is the arc f; a circle with a radius R and O3 serving as the circle center is made to be tangent to the circle O1 and the circle O2, and the arc between tangent points is the arc b. The submarine pipeline capable of restraining vortex-induced vibration is insensitive to incoming flow direction and excellent in flow-resistant strength and vibration restraining performance.

The invention discloses a viscous damper with a pressure relief device and relates to the field of dampers. The viscous damper comprises a first cylinder body, a first connecting ring, a piston and the pressure relief device; the first cylinder body comprises a closed cavity with damping fluid; the first connecting ring is located on one side of the first cylinder body; the piston is located in the closed cavity, can move in the closed cavity back and forth and comprises a through hole which penetrates through the piston and is formed in the moving direction of the piston; the pressure relief device is arranged in the piston and comprises two or more pressure relief valves with valve bodies, flow jet holes formed in one sides of the valve bodies and flow guide holes formed in the valve bodies and in the other sides of the valve bodies, the pressure relief valves exert pressure on the valve bodies, one or more valve bodies receive the damping fluid pressure opposite to the pressure exerted by the pressure relief valves when the piston moves in the closed cavity back and forth, and the valve bodies are opened or closed correspondingly when the damping fluid pressure is greater or smaller than the pressure exerted by the pressure relief valves. The viscous damper is low in cost, has the function of a locking device and the function of a common viscous damper and can be freely switched between the two functions.

The invention discloses a flexible sheet active and passive mixed vibration controller, belongs to the technical field of inhibition of the vibration of flexible sheets, and aims to control the vibration of the flexible sheets. The flexible sheet active and passive mixed vibration controller comprises a flexible sheet, a damping piece arranged on the flexible sheet, a piezoelectric actuator arranged on the flexible sheet, a piezoelectric sensor arranged on the flexible sheet, a driving power supply connected with the piezoelectric actuator, a data acquiring card connected with the piezoelectric sensor, and an upper computer connected with the driving power supply and the data acquiring card. The flexible sheet active and passive mixed vibration controller saves the energy at high frequency, and still achieves an excellent vibration inhibition effect at low frequency, so that the excellent inhibition effect can be maintained in a wider frequency range.

The invention provides an unmanned aerial vehicle rotor arm structure with the outer surface additionally provided with a segmented constrained damping layer. An unmanned aerial vehicle rotor arm comprises a rotor arm body, the constrained damping layer and a viscoelastic damping layer; the rotor arm body is of a hollow cylindrical structure made of a carbon fiber material; the constrained dampinglayer and the viscoelastic damping layer are each of a segmented hollow cylindrical shell structure, and are made of an aluminum alloy and ZN-1 damping rubber correspondingly; and the rotor arm, theviscoelastic damping layer and the constrained damping layer are tightly bonded in sequence from inside to outside. By additionally arranging the segmented constrained damping layer on the outer surface of the unmanned aerial vehicle rotor arm, the viscoelastic damping layer deforms through elastic bending vibration of the rotor arm, and thus vibration energy of the unmanned aerial vehicle rotor arm is dissipated rapidly for vibration reduction. The structure is simple, a main body structure of an unmanned aerial vehicle is not affected, extra additional mass and control device are not needed,the flight stability of the unmanned aerial vehicle is improved, and the vibration suppression effect in practical application is remarkable.

The invention relates to a monorail suspension inspection trolley, and belongs to remote control inspection equipment. The technical scheme adopted by the invention is as follows: the monorail suspension inspection trolley comprises at least two sets of moving wheels located above a single rail. Built-in driving device of moving wheel, moving wheel carriers are arranged at the end parts of wheel shafts of all the moving wheels for connection; the axle distance between the moving wheels is fixed; the same crawler belt is arranged on the outer peripheral faces of all the moving wheels, the innerside face of the crawler belt and the outer peripheral faces of the moving wheels are provided with concave-convex structures meshed with each other, the outer side face of the crawler belt is provided with a rail groove matched with the rail in shape, the rail is embedded into the rail groove, a hoisting connecting frame is hung below the moving wheel frame, and inspection equipment is installedbelow the hoisting connecting frame. Crawler-type transmission is adopted, the problem of hard friction between the trolley and a rope rail is solved, the trolley has good vibration suppression performance, stable walking, good skid resistance and climbing capacity, and the trolley can be well suitable for special industrial occasions such as underground coal mines and chemical workshops and is good in applicability.

The invention relates to the technical field of building vibration reduction structures, in particular to a settling-resistant vibration isolation system, a vibration reduction method, a building, anda vibration isolation effect detecting method. The settling-resistant vibration isolation system comprises a multi-stage vibration isolation basic structure arranged between a foundation layer and one or more target basic layers; and the multi-stage vibration isolation basic structure comprises a vibration reduction basic layer arranged between the bottom foundation layer and all the target basiclayers, and first bottom mat layers arranged between all the target basic layers and the vibration reduction basic layer correspondingly. The vibration isolation system can achieve the good enough vibration suppression effect which cannot be achieved by an existing single-stage vibration isolation structure, and the effective effect of resisting uneven settling is generated through the multi-stage vibration isolation basic structure; and the vibration isolation system can effectively relieve the vibration influence caused by rail traffic operation on the building, and can further improve thecapacity of the building for resisting uneven settling.

The invention provides a consistent distributed vibration control method for a solar panel of a spacecraft. The method comprises the following steps: dividing an internally consolidated solar panel into a plurality of intelligent components which can be independently controlled according to the characteristics of structure assembly, and constructing a finite element model of a single intelligent component and an overall structure finite element model oriented to distributed control after assembly based on a mass matrix, a damping matrix and a stiffness matrix of each intelligent component, designing a distributed controller by combining a graph theory and a consistency theory, wherein the designed overall controller is in a matrix form of each distributed controller comprising a feedback stabilization item and a consistency collaboration item. According to the distributed control method containing the consistency collaboration item, vibration of a satellite solar panel can be effectively restrained, the dynamic performance of the system is improved, the convergence speed is higher, meanwhile, the robust fault-tolerant capability is high, vibration control can still be achieved by means of the consistency collaboration item under the condition that a part of the control system fails, and the method is suitable for large-scale popularization and application. And closed-loop stability of the system is ensured.

The invention discloses a variable-frequency photonic crystal vibration suppression device for a structure. The variable-frequency photonic crystal vibration suppression device comprises a first-order elastic column, a first-order oscillator mass element, a second-order elastic column, a second-order oscillator mass element, a third-order elastic column, a third-order oscillator mass element and an elastic column base. The first-order oscillator mass element is of a frame structure, elastic column bases for providing structural support for other-order oscillators are symmetrically arranged on the frame structure, and the first-order oscillator mass element is fixedly connected with first-order elastic columns; the second-order elastic column and the third-order elastic column are installed on the corresponding elastic column bases respectively. The second-order oscillator mass element and the third-order oscillator mass element are fixedly connected with the second-order elastic column and the third-order elastic column respectively. The second-order elastic column and the third-order elastic column are provided with adjusting devices used for controlling axial tension and pressure in the second-order elastic column and the third-order elastic column. The vibration suppression frequency of the device can be correspondingly adjusted, and the device has excellent multi-level line spectrum vibration suppression efficiency and has wide engineering application prospects.

In the present invention, a balancer device (7) forms two layers in the radial direction and comprises annular chambers (33, 34) having a plurality of partition walls (36, 37) radially distributed therein. The partition walls (36, 37) are constituted from: transverse parts (36a, 37a) that extend across upper parts of the annular chambers (33, 34); substantially perpendicular parts (36b, 37b) thatare connected to the transverse parts (36a, 37a) and vertically extend a predetermined height; and inclined parts (36c, 37c) that extend angularly from the lower ends of the substantially perpendicular parts (36b, 37b) to positions at a predetermined height from inner bottom parts on the inner circumference side of the annular chambers (33, 34). This allows the balancer device (7) to have a sufficient inner diameter, ensures ease of removal of laundry, and makes it possible to suppress vibration.

The invention provides a fan and electronic equipment, the fan comprises a shell unit, a rotating unit and an annular damping unit, the shell unit is provided with a containing space, the rotating unit is located in the containing space, the rotating unit comprises a rotating shaft and a fan blade assembly, the fan blade assembly can rotate around a central axis relative to the shell unit, the rotating shaft is sleeved with the annular damping unit, and the annular damping unit is located in the containing space. The annular damping units restrain the rotation shaft from moving in the direction away from the central axis through the elastic effect of the elastic pieces. Through the annular damping unit arranged on the rotating shaft in a sleeving mode, movement of the rotating shaft in the direction away from the central axis is restrained, vibration of the rotating shaft is reduced fundamentally, and then a good vibration restraining effect is achieved on the fan blade assembly and other assemblies outside the fan blade assembly.

The invention discloses a submarine pipeline capable of restraining vortex-induced vibration. The submarine pipeline is formed in the mode that the cross section of the lower end of a pipeline body is pulled upwards in a spiral mode through the center axis in the axial direction, the outer boundary of the cross section of the lower end is formed by end-to-end connection of six 60-degree arcs in the tangential direction, the six 60-degree arcs are the arc a, the arc b, the arc c, the arc d, the arc e and the arc f in sequence in the clockwise rotation direction, the line connecting the circle center O1 of the arc a with the central point O of the lower cross section, the line connecting the circle center O2 of the arc c with the central point O of the lower cross section, and the line connecting the circle center O3 of the arc e with the central point O of the lower cross section are in the same length, and the included angles between the three lines are 120 degrees; a circle with a radius of R=O1O2+O1A is made to be tangent to the circle O2 and the circle O3, O1A is the radius of the arc a, the arc between tangent points is the arc d, and O2 serves as the circle center; a circle with a radius R is made to be tangent to the circle O1 and the circle O3, and the arc between tangent points is the arc f; a circle with a radius R and O3 serving as the circle center is made to be tangent to the circle O1 and the circle O2, and the arc between tangent points is the arc b. The submarine pipeline capable of restraining vortex-induced vibration is insensitive to incoming flow direction and excellent in flow-resistant strength and vibration restraining performance.

The invention provides a multi-stable nonlinear energy trap with a segmented linear beam and permanent magnet negative stiffness, which includes a segmented linear beam composed of three segmented linear rods with different stiffnesses, one end of which is fixed on the segmented linear beam base. On the top, the other end is inserted into the MNES mass block. During installation, the segmented linear rods on both sides have a certain amount of pre-compression with the MNES mass block. There is a gap between the segmented linear rods in the middle and the MNES mass block. As the MNES mass block moves up and down , causing the compression amount between it and the piecewise linear beam to change, producing piecewise linear positive stiffness. The required negative stiffness is generated through the inner and outer magnets, and the multiple required steady-state positions are constructed using the optimal combination of positive and negative stiffness. The vibration energy of the system to be damped is transmitted in one direction to the energy well of the present invention, and is eventually quickly dissipated through the damping of the energy well, thereby achieving efficient suppression of the vibration of the main system. The energy trap has a simple structure, wide vibration suppression frequency, and remarkable vibration suppression effect.

The invention discloses a tuned passive damper with two degrees of freedom. The tuned passive damper with the two degrees of freedom comprises mass blocks, sliding blocks, elastic-damping units and rigidity adjusting bolts; grooves are formed in the two ends of each mass block, every two sliding blocks are arranged in one groove and are tightly attached to a thin plate in the corresponding elastic-damping unit, and each thin plate is provided with a sliding groove corresponding to the groove in the corresponding mass block. Each sliding block is located by the corresponding rigidity adjusting bolt penetrating through the corresponding groove and the corresponding sliding groove, so that the distance between the two sliding blocks on the same side of each mass block is adjusted through the corresponding bolts, and rigidity adjustment of the damper is achieved. Besides, a friction plate with the adjustable angle is arranged between the corresponding sliding blocks and the side wall of a base of the corresponding elastic-damping unit, the contact area between each friction plate and the corresponding mass block is changed by adjusting the angle of the corresponding friction plate, and therefore the damping ratio of the damper is adjusted. The tuned passive damper with the two degrees of freedom has the advantages of being simple in structure, convenient to implement and low in cost, having no pollution to the environment, being capable of effectively lowering vibration in a cutting process, and achieving high-efficiency and high-quality machining of parts.