17results about How to "High damping efficiency" patented technology

The invention provides a quasi-zero stiffness vibration damping device based on a tensegrity, which comprises a first tensegrity vibration damping device, a second tensegrity vibration damping device and a cam group buffer device, and utilizes the nonlinear quasi-zero stiffness characteristics of the self-balance, low dynamic stiffness and high static stiffness characteristics of the tensegrity structure. Through cooperative work of the first tensioning overall vibration reduction device and the second tensioning overall vibration reduction device, longitudinal stress is converted into deformation of an elastic element of a quasi-zero-stiffness mechanism, and therefore vibration reduction is effectively achieved. According to the damping device, the whole tensioning structure and the cam set structure are combined, the damping work is achieved through the combination of the damping performance of the quasi-zero stiffness structure and the damping performance of the tensioning mechanism, the device is high in impact resistance and remarkable in self-balancing and self-stabilizing performance, vibration can be effectively reduced, and the safety of the damping device is improved.

The invention discloses a wind power blade provided with liquid dampers and a preparation method of the wind power blade. 10-20 fish-shaped sheet type liquid dampers are arranged in series in the axial direction of an inner cavity of the blade in a section 10-20 m away from a blade tip, and the fish-shaped sheet type liquid dampers equivalently replace original blade webs in the section; the fish-shaped sheet type liquid dampers and the blade skin are bonded together through structural adhesive, and every two fish-shaped sheet type liquid dampers are bonded together through structural adhesive. The fish-shaped sheet type liquid damper is a sheet type prefabricated part with a fish-shaped section, the outer contour of the fish-shaped sheet type liquid damper is the clearance size of an inner cavity of the wing-shaped section of the blade, a flow guide partition plate perpendicular to the chord line of the blade is arranged in the fish-shaped sheet type liquid damper, and the inner cavity of the fish-shaped sheet type liquid damper is divided into zigzag and roundabout thin and long damping liquid flow channels by the flow guide partition plate. According to the blade provided with the liquid damper, vibration of the blade in the shimmy direction can be effectively restrained in the blade operation and shutdown states.

The application discloses a kind of active shock absorption and steady control system and method based on voice coil motor, it is related to mechanical vibration control technical field.The method is by obtaining the phase signal synchronous with excitation source, directly from waveform look-up table index and output opposite phase drive instruction, drive voice coil motor to generate counterforce.Meanwhile, the system uses the residual acceleration of non-causal filtering processing in background, and adaptively updates waveform look-up table.The application adopts feedforward control, avoids the phase delay caused by filtering in traditional feedback control, can accurately suppress high-frequency periodic vibration with very low delay, significantly improves operation comfort.

The invention provides a bidirectional vibration reduction tuned mass damper for a tower and a vibration control method. The damper comprises a damper mounting frame, a moving mass block, a magnetic suspension damping assembly, an eddy current damping assembly, two groups of elastic recovery assemblies and two groups of horizontal guide assemblies which are arranged in a crossed and layered manner; the damper mounting frame is mounted at the top end of the tower; the moving mass block can be mounted in the damper mounting frame in a multidirectional horizontal moving manner through a horizontal guide assembly, and is mounted in a suspension manner through a magnetic suspension damping assembly arranged in the horizontal guide assembly; the eddy current damping assembly is integrally mounted in the magnetic suspension damping assembly; and the two groups of elastic recovery assemblies are respectively connected between the moving direction of the moving mass block and the damper mounting frame. According to the control method, a tower-damper coupling model is established, and current output to a driver of the damper is controlled and adjusted according to intensity parameters measured in real time. The device has the advantages of being good in damping and restraining effect, compact in structure and the like.

The application discloses a wind power blade liquid damper, a prefabrication method and a wind power blade. The liquid damper comprises an elongated pipe and damping liquid. The elongated pipe is arranged in parallel on the SS inner surface and the PS inner surface of the wind power blade at a preset interval, is located at the wind power blade tip, is arranged along the airfoil contour line of the wind power blade, and is connected to the leading edge and the trailing edge of the wind power blade at two ends. The central axis of each elongated pipe is perpendicular to the pitch shaft of the wind power blade. The damping liquid is filled in the elongated pipe at a preset volume filling rate, so that the damping liquid is constrained in the elongated pipe and flows back and forth along the airfoil contour line of the wind power blade. The centrifugal force direction of the blade is always perpendicular to the movement track of the damping liquid. The liquid turbulent flow is generated by bending the elongated pipe to absorb vibration energy, the first-order pendulum vibration of the wind power blade can be effectively inhibited, and the liquid damper can meet the maintenance-free characteristic requirement in the service life.

This invention provides a floor vibration damping structure and a rail vehicle. Multiple through holes are spaced apart along the floor's extension direction in the vibration damping body. Each through hole has a first inner wall and a second inner wall arranged opposite to each other along the expansion and contraction direction of the vibration damping body. The first and second inner walls have a separated state and an abutting state. In the separated state, the vibration damping body provides a first elastic force to the floor. When the vibration damping body is subjected to increased pressure, the first and second inner walls are in the abutting state, and the vibration damping body provides a second elastic force to the floor. By designing the vibration damping body with holes, a high-stiffness elastic body with low stiffness design is achieved, which is beneficial for reducing in-vehicle noise. It also achieves a variable stiffness design; that is, when the hole is compressed, it provides low-stiffness vibration damping support. When subjected to a large external load or passenger jumping impact load, the first and second inner walls are in the abutting state, the hole closes, and high-stiffness support is achieved, preventing excessive floor subsidence that could lead to floor damage. This improves vibration damping efficiency while satisfying lateral support stability.

This utility model discloses a vibration damping device, wall panel, and mechanical equipment based on a Mikaelian lens. The vibration damping device based on a Mikaelian lens includes: a conformal self-focusing lens; a vibration damping element disposed on a portion of the conformal self-focusing lens corresponding to at least one wave focus; and / or an energy harvesting element disposed on a portion of the conformal self-focusing lens corresponding to at least one wave focus. Thus, by disposing of the vibration damping element and / or the energy harvesting element on the portion of the conformal self-focusing lens corresponding to at least one wave focus, or on a portion of the conformal self-focusing lens adjacent to at least one wave focus, the vibration damping element can suppress vibrations transmitted to the conformal self-focusing lens, and the energy harvesting element can collect and utilize the vibrational energy transmitted to the conformal self-focusing lens.

The present invention provides a vibration reduction device and method based on the Lello triangle, comprising a mechanical vibration reduction device, a Lello triangle material vibration isolation piece, a vibration reduction device main body shell and a vibration reduction spring connection device. The mechanical vibration reduction device cooperates with three groups of hydraulic connecting rods through a rotor column to convert longitudinal force into rotation in a horizontal plane, thereby effectively achieving vibration reduction. A plurality of Lello triangle vibration reduction grooves are arranged in an array on the surface of the Lello triangle material vibration isolation piece. The equal width characteristic of the Lello triangle is utilized to make the force on the three sides evenly distributed, thereby further enhancing the vibration reduction effect. The vibration reduction spring connection device adopts a bidirectional iris structure, which can easily realize the connection and replacement of the vibration reduction spring, and the connection is reliable and durable. The present invention combines a mechanical vibration reduction device with a Lello triangle material vibration isolation piece, which has strong impact resistance, can effectively reduce vibration, and improves the safety of the vibration reduction device. Moreover, the Lello triangle material vibration isolation piece is not limited by the substrate, has a strong bearing capacity, and can work safely and stably for a long time.

The invention provides a vibration control device and a vibration control method for an elongated structure. The device comprises a fixing assembly, a damping assembly, a cantilever rod and two mass blocks, the two ends of the cantilever rod are connected with one mass block, and the damping assembly is arranged in the cantilever rod and / or the mass blocks; the double-cantilever anti-vibration structure is installed below the long and thin structure through a fixing assembly. The method comprises the following steps: determining modal frequency, modal damping, modal quality and control modal order of the slender structure; determining configuration parameters of the device according to the data of the slender structure; determining the configuration of the double-cantilever anti-vibration structure according to the mass of a mass block, the rigidity of a cantilever rod, the length of the cantilever rod and the damping ratio of the double-cantilever anti-vibration structure in the configuration parameters; and determining the maximum displacement point of the modal shape of the slender structure according to the control modal order and the length of the slender structure, and determining the maximum displacement point as the mounting position of the double-cantilever anti-vibration structure on the slender structure. The damping device has the advantages of being excellent in damping effect, simple in structure and the like.

The present invention discloses a damping device for controlling vertical vibration, comprising a first connecting seat and a second connecting seat which are vertically distributed, wherein a vertical damper is vertically arranged between the first connecting seat and the second connecting seat; a plurality of transverse dampers are evenly arranged around the connecting piece, and the plurality of transverse dampers are located on the same horizontal plane and are symmetrically distributed; a connecting rod comprises a plurality of upper connecting rods and a plurality of lower connecting rods, wherein the upper end of the upper connecting rod is hinged to the first connecting seat, and the lower end is hinged to the free end of the corresponding transverse damper; the lower end of the lower connecting rod is hinged to the second connecting seat, and the upper end is hinged to the free end of the corresponding transverse damper; the present invention drives the transverse damper to stretch or compress through the connecting rod, and utilizes the connecting rod to amplify the energy-consuming displacement of the vertical damper, thereby playing a role of secondary energy consumption, and the device has a good energy consumption effect, and can effectively control the vibration of mechanical equipment or buildings caused by vertical vibration, and avoid the mechanical equipment or buildings from being affected by vibration.

The application provides an active mass damper with a linear motor, which comprises a linear motor, a mass unit and a mounting base, the linear motor and the mass unit are arranged side by side and are mounted on the damping target structure through the mounting base, wherein the linear motor comprises a motor mover and a linear winding arranged outside the motor mover; the mass unit comprises a mass block and two groups of universal hinge transmission assemblies, the two groups of universal hinge transmission assemblies are symmetrically arranged along the movement direction of the motor mover and are connected through a connecting screw; the mass block is slidably mounted on the mounting base and is connected with the main shaft of the motor mover through the two groups of universal hinge transmission assemblies. The application has the advantages of achieving excellent damping effect for multi-order modes, occupying small space and being effectively applicable to narrow space.

The present invention discloses a valve-controlled constant damping adjustable fluid inertia suspension device, which is based on a double-rod hydraulic cylinder and realizes the switching of two fluid pipelines through a high-speed switch valve. The structural parameter design ensures that when the fluid flows through any fluid pipeline at high speed, the expected inertia force and damping force are generated, the adjustment of the inertia force and the damping force are independent of each other, and the damping force is constant. A spiral tube is provided, and the fluid flows from one side of the hydraulic cylinder barrel to the other side through the spiral tube to form a first fluid pipeline. A short straight tube with a damping hole is provided, and the fluid flows from one side of the hydraulic cylinder barrel to the other side through the short straight tube with the damping hole to form a second fluid pipeline. The present invention is suitable for the harsh working conditions of military vehicle suspension devices, and the two working pipelines can be switched through switch control to adjust the inertia and damping characteristics of the suspension, thereby greatly improving the vibration reduction performance of the suspension device, and has good application value.

The invention discloses a sliding steel beam type eddy current damper for a building structure and a building. The sliding steel beam type eddy current damper comprises a concrete sliding floor. The concrete sliding floor (2) is connected to a structural column through the telescopic rod; the upper surfaces of the supporting sliding rail seats support the sliding floor in a sliding mode, permanent magnets are arranged on the inner sides of the supporting sliding rail seats on the two sides, and the permanent magnets on the two opposite faces are in one-to-one correspondence. The two conductor plates (20) are arranged back to back and used for driving the conductor plates (20) to cut magnetic induction lines of the permanent magnets (11) on the two sides to generate eddy current when the sliding floor slabs (2) move relatively so as to generate damping force for hindering movement of the sliding floor slabs (2). The internal use space of a building is not occupied, the sliding floor is adopted to form a part of a damping structure, so that the vibration reduction device can be integrated into the building structure, the use function of the building is not affected, the liquid leakage problem of a viscous damper in the existing vibration reduction technology can be solved, dependence on external energy is not needed, maintenance is convenient, and the cost is low.

The present invention provides a quasi-zero stiffness vibration damping device based on tensegrity, comprising a first tensegrity vibration damping device, a second tensegrity vibration damping device and a cam group buffer device. The device utilizes the self-balancing of the tensegrity structure and the nonlinear quasi-zero stiffness characteristics of low dynamic stiffness and high static stiffness, and through the coordinated work of the first tensegrity vibration damping device and the second tensegrity vibration damping device, the longitudinal force is converted into the deformation of the elastic element of the quasi-zero stiffness mechanism, thereby effectively achieving vibration reduction. The present invention adopts a combination of the tensegrity structure and the cam group structure, and realizes vibration reduction by combining the vibration damping property of the quasi-zero stiffness structure with the vibration damping property of the tensioning mechanism. The device has strong impact resistance, remarkable self-balancing and self-stabilizing properties, can effectively reduce vibration, and improves the safety of the vibration damping device.

The invention discloses an inhaul cable multi-order modal vibration three-damper control system and a vibration monitoring method, the system comprises a mechanical damper arranged at a near cable-beam anchoring end of a cable-stayed bridge, and the mechanical damper comprises a speed type damper and a tuned mass damper; the two speed type dampers form an isosceles trapezoid type double-speed type damper in an isosceles trapezoid structure.

The invention belongs to the technical field of damping seats, and particularly relates to a seat damping mechanism with air storage tanks, which comprises an upper plate assembly and a lower plate assembly, a damping air bag is supported between the upper plate assembly and the lower plate assembly, and more than one air storage tank is arranged on the upper plate assembly or / and the lower plate assembly. The damping mechanism has the advantages that the damping mechanism is simple in structure, the volume of the damping air bag is large, the damping frequency is large, the damping comfort is good, and the damping mechanism is suitable for the vehicle seat.

The invention discloses a variable damping hydraulic torsion damper suitable for a hybrid power vehicle, and belongs to the technical field of mechanical vibration control. The shell is connected with a driving side, a spring mounting window and an oil duct are arranged on a driving disc cover, the hub is connected with a driven side, an internal spline is arranged on a central shaft of a driven disc hub, so that the central shaft is connected with a power output shaft, a spring mounting window and a limiting bump are arranged on the central shaft, and a closed annular cavity oil duct is formed between the disc cover and the disc hub. A floating damping ring is arranged between every two adjacent limiting protruding blocks, the cavity is filled with viscous fluid damping media, and a throttling valve of a one-way valve structure is arranged in the annular cavity to control throttling output. Damping springs are installed in windows of the disc cover and the disc hub, and spring guide rods are placed on the two sides of the damping springs to form a damping device. The disc cover and the disc hub are sealed through a framework oil seal. The invention particularly discloses a high-elasticity vibration damper with a spring-mass system and a separately arranged hydraulic vibration damping system.