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

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 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 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 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 a tower frame of a wind power generating set that can automatically adjust the damping property. The tower frame of the wind generating set includes: a tower structure, an inner support shell structure, an air pump and a control system; the top end of the inner support shell structure and the bottom end are respectively connected with the inner wall of the tower structure to form a closed damping chamber; the damping chamber is filled with damping liquid; the bottom of the damping chamber is provided with a plurality of air bags connected with the air pump, The top of the damping chamber is provided with an exhaust hole; the tower structure is provided with an acceleration acquisition system; the control system is respectively connected with the acceleration acquisition system and the air pump, and is used to control the air pump to adjust the charge according to the acceleration measured by the acceleration acquisition system. The volume of the air bag can change the damping liquid height in the damping cavity. The invention can accurately adjust the frequency of liquid damping according to the actual vibration situation of the tower, and achieve the best vibration suppression effect. There is no need to manually adjust the damping fluid height, reducing the risk of damping adjustment deviation.

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 field of suspension bridge vibration reduction, in particular to a suspension bridge suspension cable vibration reduction system, which includes oblique auxiliary cables and longitudinal auxiliary cables arranged longitudinally along the bridge. One end of the auxiliary cable is connected with the bridge tower, the other end of the longitudinal auxiliary cable is connected with the main cable, the longitudinal auxiliary cable is connected with at least one hanging cable through a rigid partition frame; one end of the oblique auxiliary cable is connected with the bridge tower, The other end of the oblique auxiliary cable is connected with the main cable, and the oblique auxiliary cable is connected with at least one rigid partition frame. In the suspension bridge suspension cable vibration reduction system of the present application, the whole formed by the main cable, the suspension cable, the longitudinal auxiliary cable and the oblique auxiliary cable should be able to deform a small amount through its own flexibility to meet the use deformation requirements of the suspension bridge. There will be no large deformation as a whole, so that the overall vibration of the suspension cable can be more effectively controlled, so as to achieve a better vibration suppression effect on the suspension bridge.

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 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 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 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.

A device for suppressing the heaving motion of a semi-submersible platform, comprising an upper platform structure, a lower floating body is connected to the lower part of the upper platform structure through a column, and the feature is that the column is equipped with a device that lowers the platform by changing the surrounding flow field. A heave suppression mechanism that produces a heave motion. A heave suppression mechanism of the present invention, the heave suppression mechanism is an extendable annular heave plate and an electric rope winch arranged on a column and forming a certain angle with the column, and the electric rope winch is provided with a steel wire rope and a Extended ring heave plate connection. It has an active control function. By adjusting the vibration frequency of the mass body, its vibration frequency is always kept near the frequency of the semi-submersible platform structure to achieve better vibration suppression.

The invention belongs to the technical field of mechanical design and manufacture, and aiming at solving the technical problems that in the present course of deep hole machining, an auxiliary supporting position is manually and blindly shifted by experience and the effect of vibration absorption is not ideal, the invention provides a combined type intelligent vibration absorber for deep hole machining and an automatic shifting control method for optimal auxiliary supporting positions. The combined type intelligent vibration absorber for deep hole machining comprises a magnetorheological fluid damper, a mechanical damping system and an automatic shift control system, wherein the magnetorheological fluid damper comprises a magnetorheological fluid cavity and a vibration absorption disk; the vibration absorption disk is installed in the magnetorheological fluid cavity; a supporting clapboard groove is arranged outside the magnetorheological fluid cavity; a hot-wire coil is wound around the supporting clapboard groove; and the magnetorheological fluid damper and mechanical damping system are installed on the automatic shift control system. The combined type intelligent vibration absorber has a unique structure and is of an important meaning for effectively inhibiting vibration of a deep hole drill rod, improving the deep hole machining accuracy and realizing intelligent digital control of a high-grade deep hole machining tool.

A two-freedom-degree electric eddy current tuning passive damper comprises a mass block, supporting frames, cylindrical sticks, stiffness adjusting nuts, permanent magnets and a supporting plate. The cylindrical sticks penetrate the mass block to be connected with the mass block through threads; the cylindrical sticks are in clearance fit with the supporting frames and are screwed up and positioned through the stiffness adjusting nuts on the two sides of the supporting frames; the bottoms of the four supporting frames are located on the same plane; and the permanent magnets are fixed to the supporting plate, the supporting plate is pasted on a workpiece, and the position of the supporting plate is adjusted, so that the two permanent magnets are located under threaded through holes of the mass block. Vibration in cutting machining can be effectively reduced, and efficient high-quality machining of the workpiece can be achieved; the two-freedom-degree electric eddy current tuning passive damper has the better vibration restraining effect; and the damper has fewer components and is easy to manufacture; and damping can be precisely adjusted, and the damper is wide in application range and has the good practicability.

The invention discloses an intelligent support sliding bearing device with adjustable gap and a gap adjustment method. The block moves along the axial direction of the guide rail. The top surface of the inclined block is a slope with a taper of 1:125. One end of the inclined block is provided with a pushing mechanism, and the other end of the inclined block is connected to a return spring. The vertical displacement sensor and the horizontal displacement sensor are used to detect the rotor respectively. The vertical radial displacement and horizontal radial displacement; the vertical displacement sensor and the horizontal displacement sensor are connected to the input terminal of the controller, and the output terminal of the controller is also connected to the input terminal of the servo motor control signal; when the rotor vibration is too large, the sensor collects The received signal is sent to the controller, the controller controls the servo motor to make a certain action, changes the gap between the bearing and the journal, makes the elliptical bearing play a role, reduces the rotor amplitude, and makes the whole system have a good vibration reduction and vibration suppression effect.

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 relates to a FxLMS filtering method for a narrow-band active vibration system. A non-acoustic sensor is used to obtain a vibration signal d(n) at the input end of the system, and a reference signal x(n) is generated according to the vibration signal d(n). The identification adopts variable power frequency sweep signal. After filtering the reference signal x(n), combined with the residual signal e(n), it is used to iteratively calculate the weight value of the FXLMS algorithm to obtain the vibration suppression signal y(n). The vibration suppression signal y(n) is obtained by n) is superimposed on the secondary channel input signal v(n) and subtracted from the low-frequency harmonic vibration signal d(n) to suppress vibration. Compared with the white noise commonly used by the classic FXLMS algorithm, the swept frequency signal with concentrated energy distribution can obtain high-quality measurement results in the frequency range of the narrow-band active vibration suppression system. Reduce the residual error of the entire narrowband active vibration suppression system. The advantage of this method is that for a narrow-band active vibration suppression system, a relatively stable secondary channel modeling value can be obtained in the synthesized frequency range, which reduces the system residual error and achieves a better 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.

The invention relates to a range extender starting active vibration suppression method based on crankshaft stop position control. The method includes the following steps: (1) determining an crankshaft-starting target initial angle, wherein at this initial angle, the excitation of a range extender suspension system on a vehicle body is minimum; (2) designing a crankshaft movement target curve using the crankshaft-starting target initial angle as an end point; (3) during the stopping process of the range extender, controlling a crankshaft to move to the end point in accordance with the crankshaft movement target curve, so that when the range extender is started next time, the crankshaft is located at the crankshaft-starting target initial angle in step (1), the excitation of the range extender suspension system on the vehicle body is minimum, and the vibration at the time of the starting of the range extender is thus inhibited. Compared with the prior art, the range extender starting active vibration suppression method has the advantages of high control precision, good vibration suppression effect, convenient implementation and the like.