48results about How to "Suppress lateral vibration" patented technology

The invention discloses a marine riser vortex-induced vibration suppression device. The marine riser vortex-induced vibration suppression device is arranged on a marine riser. The marine riser vortex-induced vibration suppression device comprises a V-shaped front end panel and a tail fin type fairing. The V-shaped front panel board is arranged on the side, facing the marine current direction, of the marine riser. The tail fin type fairing is arranged on the side, back to the marine current, of the marine riser. The cross section of the V-shaped front end panel is V-shaped, and is tangent to the surface of the marine riser. The marine riser vortex-induced vibration suppression device has the advantages that by arranging V-shaped wing boards on the V-shaped front end panel, swinging in a small range can be achieved along with the current, incoming flow is led to be scattered, meanwhile resistance force on the marine riser due to the incoming flow can be lowered, the vortex-induced vibration can be effectively suppressed, lift force is greatly lowered, and the fatigue life of the riser is prolonged; the vortex-induced vibration suppression device has the advantages of being simple in structure, and convenient to process and install due to blocking.

The invention discloses an enclosure structure with a vibration suppression function and a method for suppressing vibration of the enclosure structure. The outer surface of the enclosure structure isprovided with heat sources. The heat sources are used for heating an airflow boundary layer at the position of the outer surface of the enclosure structure, and through heating, the density of the airflow boundary layer rho can be lowered, the amplitude is reduced, and transverse vibration is suppressed; the airflow boundary layer at the position of the windward surface of the enclosure structureis heated, the airflow boundary layer density is lowered, and equivalently an airflow buffer layer is arranged at the windward surface; and when the windward incoming flow meets the airflow buffer layer, the turbulence can be weakened, the pulsatility is lowered, and the following wind impact on the enclosure structure is reduced, so that the following wind vibration of the enclosure structure canbe suppressed.

A disk cutter including an annular disk-shaped base adapted to be driven about an axis of rotation, the base having a first thickness, a plurality of tip supports formed along the outer circumference of the base integrally therewith so that a gullet is defined between adjacent ones of the tip supports, a plurality of tip inserts respectively fixed to the tip supports, each of the tip inserts having a second thickness, and a plurality of thicker portion formed along a trailing end of each tip support in respect of rotation of the base, the thicker portion having a third thickness. The third thickness is greater than the first thickness and less than the second thickness.

The invention discloses a surrounding body and equipment for inhibiting vibration of an enclosure protection structure and a method for hoisting a tower drum. The surrounding body can surround the enclosure protection structure, faces the outer surface of the inner side of the enclosure protection structure and is provided with a plurality of elastomers which extrude the enclosure protection structure under the action of an upwind inflow, and during extrusion, an airflow scaling flow passage is formed among the elastomers; and an airflow in the scaling flow passage has the air blowing function to the upper enclosure protection structure boundary layer, so that the airflow, on the upper side, flowing around the wall of the enclosure protection structure is interfered, the boundary layer at the position is destroyed, and formation of a Karman vortex street is inhibited and destroyed. According to the technical scheme of the invention, the natural force is fully utilized, and in the premise of greenness and environmental protection, the optimal turbulent flow breaking effect is achieved, the phenomenon of the Karman vortex street is inhibited, occurrence of vortex-induced vibration is hindered, or vibration is reduced.

The elevator control device can prevent deterioration of the ride quality of the car during normal operation, and can more reliably suppress the lateral vibration of the movable connecting body. A control device (11) for an elevator includes a drive control unit (14), a control mode switching unit (12), and a calculation unit (13). When the driving control part (14) changes the rotating speed of the driving pulley (7) in a wave manner, it can limit the change frequency of the rotating speed of the driving pulley (7) in the normal mode within the prescribed low frequency band and can make the driving pulley (7) ) to switch between the vibration suppression mode at a frequency higher than the low frequency band. A control mode switching unit (12) detects lateral vibration of the main rope (8), and switches the control mode of the drive control unit (14) to a vibration suppression mode. A calculation unit (13) calculates a signal for canceling lateral vibration. The drive control unit (14) controls the rotation of the drive pulley (7) based on the information from the calculation unit (13) to suppress lateral vibration in the vibration suppression mode.

The invention provides a control method and equipment of a wind generating set. The control method comprises the steps that the inclination angle of the top of a tower of the wind generating set is obtained; determining an additional variable pitch angle of each blade of the wind generating set based on the obtained inclination angle; and performing independent pitch changing based on the determined additional pitch changing angle so as to suppress lateral vibration of the tower. According to the control method and equipment, accurate tower lateral resistance increasing can be conducted through independent variable pitch based on the inclination angle of the top of the tower, and therefore lateral vibration of the tower is well restrained.

The invention discloses a damping component of a large self-unfolding satellite antenna, and aims to solve a problem of profile precision errors caused by vibration in an unfolding process of an existing unfolding antenna mechanism and in a posture adjusting process after unfolding. The component comprises a multi-finger-petal friction damper, a self-resetting elastic support friction damper, an elastic driving hinge and a satellite structure rod piece. The multi-finger-petal friction damper controls transverse vibration of the satellite unfolding antenna and comprises a multi-finger-petal rodwhich is pressed on a structural rod piece through an adjustable pressing ring. The self-resetting elastic support friction damper controls axial vibration and comprises a metal rubber, a guide rod,an SMA pull wire and an outer sleeve. The elastic driving hinge provides unfolding power through a volute spring, and an unfolding speed and synchronism are controlled through a gear. The satellite structure rod piece is fixedly connected with other assemblies so that integrity of the unfolded antenna is ensured. The component is used for satellites and space detectors.

A vibration damping device for suppressing transverse vibrations occurring in an elevating body of an elevator is configured so that a coil provided on the actuator moving part side can be held firmly to a bobbin, and a minute slippage occurring in the coil can be prevented reliably.

For this purpose, a groove is formed in the wire direction of the coil in the bobbin of the moving part, and the coil is formed by winding the wire in the groove. The coil is integrated as a whole, and the adjacent wires forming the innermost layer of the coil are brought into contact with each other, and are brought into contact with a part of the groove in the transverse cross section.

An actuator unit includes two chambers defined in the cylinder; a supply passage allowing a working fluid discharged from the pump to be supplied to the two chambers; a discharge passage allowing the two chambers to communicate with the tank; a direction control valve configured to selectively communicate each of the two chambers with one of the pump and the tank; a control passage that branches from the supply passage on a side of the pump rather than the direction control valve so as to communicate the pump with the tank; a variable relief valve provided on the control passage, the variable relief valve opening so as to allow the working fluid to flow from the supply passage toward the tank when a pressure in the supply passage reaches the valve opening pressure; and a center passage that communicates the tank with an interior of the cylinder.

The invention discloses a method for reducing the undulatory wear of steel rails. The steel rails are supported by sleepers and fixed to the sleepers through fasteners in fastened and pressed modes. Tracks of the steel rails guide wheels, and the steel rails and the wheels interact with each other to form a wheel rail system. According to the method for reducing the undulatory wear of the steel rails, the wheel rail flexibility difference and steel rail vibration, particularly in the wheel rail system transverse direction, are reduced. Through the method for reducing the undulatory wear of thesteel rails, vibration noise can be reduced, the undulatory wear of the steel rails is reduced, the wheel rail relation is improved accordingly, wheel rail vibration and noise are reduced, the service lives of the steel rails and the wheels are prolonged, the effectiveness of the track fasteners is improved, and the travelling safety is improved finally.

The invention relates to a vacuum chuck or gripping device, with a suction surface to which a held workpiece can be sucked, the suction surface has at least one bearing region, which rests while holding the workpiece at this. For positionally stable, friendly and slip-proof suction and holding of the workpiece, the contact region has a coating with an elastomer.

The invention provides a large-size air coupling transducer based on a photonic crystal structure, and belongs to the field of photonic crystals. The invention discloses a large-size air coupling transducer based on a photonic crystal structure. The large-size air coupling transducer comprises a 1-3 type piezoelectric composite material layer, an acoustic impedance gradient matching layer, an upper electrode arranged between the 1-3 type piezoelectric composite material layer and the acoustic impedance gradient matching layer, and a lower electrode arranged at the bottom of the 1-3 type piezoelectric composite material layer, the 1-3 type piezoelectric composite material layer comprises a plurality of piezoelectric material columns and a polymer phase 1; the acoustic impedance gradient matching layer comprises a plurality of filling cones and a polymer phase 2. According to the large-size air coupling transducer, the phononic crystal structure is combined with the 1-3 type piezoelectric composite material and the gradient matching layer in the transducer, so that transverse vibration is better inhibited when the transducer works, vibration in the thickness direction is purer, and the transducer has better acoustic impedance matching performance with an air medium.

The invention discloses a D-shaped fin for tower vibration reduction, which comprises spiral structure fins and connecting pieces, and the tops, the middle parts and the bottoms of every three spiral structure fins are respectively connected with one connecting piece to form the D-shaped fin with a spiral structure; the D-shaped fin structures are annularly welded on the tower outer thermal insulation layer at equal intervals through connecting pieces; seen from top to bottom, the three spiral structure fins in each D-shaped fin are arranged at an angle of 120 degrees. The device is suitable for engineering application, large-scale vortexes are broken into small-scale vortexes instead of destroying vortex shedding of a boundary layer of a tower, an original flowing state of fluid on the surface of the tower is destroyed, the fluid is forced to change an original vortex shedding mode, and then the vibration effect of the fluid on a tower body is restrained; the damping device has the characteristics of easiness in processing, easiness in installation, remarkable damping effect and easiness in popularization.

The invention discloses a tower lateral resistance increasing control method and system applied to a wind generating set, and the method comprises the steps: carrying out the band-pass filtering of a cabin lateral vibration signal, extracting a tower lateral vibration signal, enabling the tower lateral vibration signal to pass through an integrator, obtaining a lateral speed signal, and carrying out the independent variable pitch lateral resistance increasing and/or torque lateral resistance increasing. That is, tower lateral resistance increasing control is achieved through independent variable-pitch lateral resistance increasing or torque lateral resistance increasing, or tower lateral resistance increasing control is achieved through independent variable-pitch lateral resistance increasing and torque lateral resistance increasing at the same time. According to the method, the lateral vibration of the tower can be effectively restrained, the lateral fatigue load of the tower is reduced, and the unit reaches the optimal operation state.

The invention discloses a chain-type freight ropeway vibration attenuation device and method. The chain-type freight ropeway vibration attenuation device comprises a horizontal adjusting mechanism, a horizontal drive mechanism, a vertical adjusting mechanism, a vertical drive mechanism, a vibration signal acquisition module and a vibration controller; the vibration signal acquisition module is arranged on a chain-type freight ropeway rope carrying mechanism, and the vibration signal acquisition module is connected with the vibration controller; the vibration controller is respectively connected with the horizontal drive mechanism and vertical drive mechanism, the power output end of the horizontal drive mechanism is connected with the horizontal adjusting mechanism, and the power output end of the vertical drive mechanism is connected with the vertical adjusting mechanism; the rope carrying mechanism is arranged on the vertical adjusting mechanism, and the vertical adjusting mechanism is arranged on the horizontal adjusting mechanism. By adopting the chain-type freight ropeway vibration attenuation device, the lateral vibration energy of a rope carrying mechanism transmission chain can be greatly reduced, the excessively-large lateral vibration of the rope carrying mechanism transmission chain can be inhibited, the service life of the freight ropeway is effectively prolonged, the operation safety and reliability of the entire freight ropeway system can be improved, and the disastrous consequence can be maximally avoided.