439results about "Friction dampers" patented technology

The invention discloses a star-shaped particle damping mechanical metamaterial vibration isolation device which comprises a protective shell, a vibration transmission device, a self-lubricating plate and an internal vibration reduction device. The protective shell is composed of an upper protective shell body and a lower protective shell body. The two vibration transmission devices are arranged on the two sides of the protection shell and each comprise a bearing plate, a force transmission plate, a sliding rod and a compressed spring. The sliding rod penetrates through the two ends of the through hole of the protective shell to be connected with the force transmission plate and the internal damping device. The two self-lubricating plates are fixed to the inner surfaces of the upper protective shell and the lower protective shell correspondingly. The vibration reduction device is composed of a vibration reduction outer frame, a cross clamping block, a quadrangular star clamping block and a spherical particle damper, and the vibration reduction outer frame comprises a vibration reduction baffle, an arc-shaped pressing device and a right-angle pressing device; the cross-shaped clamping block comprises a cross-shaped frame and a right-angle pressing device, the cross-shaped clamping block and the quadrilateral star clamping block are periodically arranged on the inner side of the vibration reduction outer frame, and the spherical particle dampers are arranged among the vibration reduction outer frame, the self-lubricating plate, the cross-shaped clamping block and the quadrilateral star clamping block and are pressed through the arc-shaped pressing device and the right-angle pressing device.

The present invention belongs to the technical field of wind-induced vibration control of bridges, and provides a one-way friction energy dissipation device for controlling the flutter of large-span bridges. The device is quickly installed before the arrival of extremely strong winds, which can temporarily and significantly improve the flutter safety of the bridge, reduce its own wind-resistant design requirements, and significantly reduce the project cost. After the strong wind, it can be easily disassembled without affecting the beauty of the bridge or interfering with navigation under the bridge. The use of one-way bearings greatly reduces the weight, transportation, loading and unloading, and storage costs of the counterweight. The device can adapt to any static wind displacement, has good robustness, is safe and reliable, economical, fast, efficient and practical, and can be shared by multiple bridges at different times, greatly reducing its own and storage costs. The device can also be used for long-term vibration control of large marine structures such as floating offshore platforms, floating wind turbines, and temporarily docked ships under the combined action of wind and waves, and wind vibration control of gentle photovoltaic structures.

The invention belongs to the technical field of bridge wind-induced vibration control, and provides a one-way friction energy dissipation device for controlling flutter of a large-span bridge. The device is quickly mounted before extremely strong wind comes, the flutter safety of the bridge can be temporarily and greatly improved, the wind resistance design requirement of the device is lowered, and the construction cost is remarkably reduced. After strong wind, the device can be conveniently disassembled, the appearance of the bridge is not influenced, and under-bridge navigation is not interfered. The application of the one-way bearing enables the weight, transportation, loading, unloading and storage cost of the balancing weight to be greatly reduced. The device can adapt to any static wind displacement, is good in robustness, safe, reliable, economical, fast, efficient and practical, can be shared by multiple bridges in different periods, and greatly reduces the self and storage cost. The device can also be applied to vibration control of large ocean structures such as floating ocean platforms and floating fans and temporary berthing ships under the combined action of stormy waves and wind vibration control of soft photovoltaic structures for a long time.

A portable supporting stand for supporting a portable metrology device, such as a laser tracker device, at a predefined height includes at least one leg having an elongated member, where, in a deployed state, the portable supporting stand is a substantially rigid support stand that is arranged to substantially rigidly support the portable metrology device on a floor surface. The portable supporting stand also includes a vibration damper unit for reducing vibrations of the portable supporting stand.

The invention relates to the technical field of vibration isolation and reduction engineering, and discloses a modular multi-mechanism vibration isolation, energy consumption and vibration absorption integrated device and a control method thereof.The modular multi-mechanism vibration isolation, energy consumption and vibration absorption integrated device comprises a support, a plurality of corrugated plates are fixedly connected to the interior of the support, and magnetorheological dampers are fixedly connected to the bottoms of the inner walls of the corrugated plates; a magneto-rheological damper is fixedly connected to the top of the support, a dynamic vibration absorber is fixedly connected to the top of the magneto-rheological damper, a particle damper is fixedly connected to the top of the dynamic vibration absorber, a control unit is arranged on the outer side of the support, the magneto-rheological damper comprises a first shell, and a piston rod is fixedly connected to the inner wall of the first shell. By integrating multiple mechanisms such as corrugated plate vibration isolation, particle damping energy consumption, dynamic vibration absorber vibration absorption and magneto-rheological damper intelligent control, all-directional vibration suppression is achieved, under different frequencies and vibration working conditions, all modules work cooperatively, the vibration reduction effect is greatly improved, and the vibration isolation efficiency gt within the broadband of 20-2000 Hz is ensured; 85%.

In the field of vibration absorbers, the invention provides an anti-symmetric rack beam type self-adaptive vibration absorption device and a frequency modulation method thereof, and the anti-symmetric rack beam type self-adaptive vibration absorption device comprises two seat plates which are arranged in parallel up and down; the upper rolling wheel is installed on the lower surface of the upper seat plate, the lower rolling wheel is installed on the upper surface of the lower seat plate, the first rack and the second rack are arranged between the two seat plates in parallel, the first rack and the second rack are respectively clamped by at least one rolling wheel set, and the first rack and the second rack are arranged in an antisymmetric mode; the gear is arranged between the first rack and the second rack, the gear is meshed with the first rack and the second rack, and when the gear rotates, the gear drives the two racks to move linearly relative to each other or move linearly opposite to each other at the same time; according to the invention, the effective length is adjusted through gear transmission so as to achieve the purpose of frequency modulation, the frequency modulation is accurate and stable, the structure is simple, the adaptability is high, the maintenance is convenient, and the cost performance is high.

Disclosed in the present application is a plate-shaped structure with vibration damping and limiting functions. The plate-shaped structure comprises an upper plate, a lower plate, phononic crystal vibration-damping cell elements, diagonally tensioned friction-damping cell elements and C-type limiting cell elements, wherein the phononic crystal vibration-damping cell elements and the diagonally tensioned friction-damping cell elements are disposed between the upper plate and the lower plate and are periodically arranged at intervals; and the C-type limiting cell elements are distributed at four corners of the plate-shaped structure. The present application has an ingenious design, and arranging the phononic crystal vibration-damping cell elements and the diagonally tensioned friction-damping cell elements between the upper plate and the lower plate to form a periodically arranged array, and arranging the C-shaped limiting cell elements at the four corners of the plate-shaped structure greatly reduce the mounting space for an electronic device and a vibration control apparatus, and solve the current problems of vibration isolators for electronic devices, i.e., poor vibration-damping and impact-resistant effects and a large displacement during operation.

Embodiments of the present invention relates to friction damper (100) for washing or drying machines comprising a tubular hollow body (110) and a damping rod (120) arranged coaxially with respect to one another for moving along each other telescopically, wherein the damping rod (120) has an outer diameter less than an inner diameter of the hollow body (110).The hollow body (110) further comprises the hollow body (110) comprises a holder (130) for holding a friction unit (200). The friction unit (200) comprises a unit body (210); a friction member (220) inside the unit body (210) to which the damping rod (120) is slidably coupled for generating a friction force onto the damping rod (120); a stationary pressure element (230); a slidable pressure element (240) surrounding at least another part of the friction member (220); a linear actuator (260) fixed to the unit body (210) for providing a sliding motion to the slidable pressure element (240).

A friction damper for dampening out vibrations generated by a drum of a laundry treating machine includes a hollow piston body; a piston rod adapted to move telescopically along a central longitudinal axis of the hollow piston body; a friction element made of a resilient material interposed in between the hollow piston body and the piston rod, wherein a friction occurs when the piston rod moves relative to the hollow piston body; fixation portions provided at free ends of the piston rod and the hollow piston body to connect the friction damper to the laundry treating machine; at least one stopper portion interposed in between the hollow piston body and the piston rod for limitation of a motion of the friction element in a direction of the central longitudinal axis.

A 3D variable damping vibration isolator based on rubber friction and extrusion mechanism is composed of a base, an upper plate, a vibration isolation spring, “” shaped bolts, lock nuts, damped rubber blocks and a shell. The damped rubber blocks are vulcanized and bonded to the external vertical surfaces of vertical steel angles uniformly distributed on the base and are opposite to each other in pairs; the upper end of each “” shaped bolt is fixed to the upper plate by upper and lower (two) lock nuts, and cross bars at the lower end are squeezed by the damped rubber blocks on both sides; contact surfaces of the damped rubber blocks and the “” shaped bolts are flat-a design of variable cross-section. The vibration isolation spring is sheathed between the base and a lug boss in the center of the upper plate.

The utility model discloses a friction damper device, which includes a main support steel plate of the damper device, a mounting flange fixedly connected to the side surface of the main support steel plate of the damper device, a first threaded rod movably connected to the inner ring surface of the main support steel plate of the damper device, a support sheet movably connected to the outer surface of the first threaded rod, a first threaded rod movably connected to the inner ring surface of the main support steel plate of the damper device, and a first gasket movably sleeved on the outer ring surface of the first threaded rod. The device can facilitate users to use and limit the installation of one end of the damper device through the mounting flange fixedly connected to the side of the main support steel plate of the damper device and the multiple mounting openings opened thereon and equipped with bolts, and can facilitate users to use and limit the installation of the other end of the damper device through the multiple clamping openings opened through the fixed clamping block and equipped with bolts.

The invention relates to a vibration absorption unit with a three-dimensional negative Poisson's ratio effect and a vibration absorption device, and relates to the technical field of vibration reduction devices. The vibration absorption unit comprises a metal frame and a vibration absorption unit, wherein the metal frame has a three-dimensional negative Poisson's ratio effect; the elastic piece is arranged in the metal frame, and the elastic piece is connected with the inner wall of the metal frame; the load block is arranged in the metal frame, and the load block is connected with the elastic piece; and the fixing piece is connected with the elastic piece and the load block. The vibration absorption unit provided by the invention overcomes the defect that a traditional two-dimensional negative Poisson's ratio honeycomb structure only presents a negative Poisson's ratio effect in a single dimension, and is suitable for a multi-axis loading condition. Meanwhile, the metal frame is combined with the elastic piece and the load block in the metal frame, so that the vibration reduction effect at a specified frequency point can be achieved, the phenomenon that the low-frequency vibration line spectrum is prominent can be avoided, and when the external excitation frequency is close to the inherent frequency of the vibrator system, the energy of elastic waves is greatly absorbed; therefore, the propagation of elastic waves in the vibration absorption unit and the vibration absorption device is isolated.

The invention provides a steel rail damper. The steel rail damper comprises a shell, a plurality of damping modules and an elastic piece. The shell is suitable for being assembled on a steel rail; the multiple damping modules are sequentially installed in the shell in the extending direction of the steel rail, and the damping modules are filled with damping particles in a free state; the elastic piece is arranged between the plurality of damping modules and the inner wall of the shell; wherein at least two damping modules are filled with damping particles with different particle diameters and / or filling rates. The invention further provides a design method applied to the steel rail damper.

The invention is suitable for the technical field of shock insulation equipment, and provides a composite buffer type shock absorber which comprises an upper fixing seat, a lower fixing seat, an elastic shock insulation unit and a plurality of transverse limiting buffers, the elastic shock insulation unit is arranged between the upper fixing seat and the lower fixing seat, the two ends of the elastic shock insulation unit abut against the friction faces of the fixing seats through sliding friction blocks, and the transverse shock absorption function is provided through sliding friction energy consumption. The four transverse limiting buffers which are arranged in an annular array mode are connected with the upper fixing base and the lower fixing base, the transverse reset capacity is enhanced and the displacement amount is limited through the elastic stretching and retracting of buffer springs and the synergistic effect of damping liquid, and the friction blocks are prevented from being disengaged; the multi-directional vibration reduction performance is further optimized, the vertical vibration isolation function and the transverse limiting function are achieved, and the problem that due to too large transverse deviation of a traditional vibration reducer, an elastic unit is torn is effectively solved.

The present disclosure relates to a strut and a landing gear including the strut, and more particularly, to an disclosure in which a strut is formed of a curved pipe formed of a flexible body to reduce a weight of a component, and at the same time, an impact load of the strut and the landing gear is alleviated through a design of the physical properties and shape of the strut.

A composite damping device for vibration reduction of a tower drum and blades of an offshore wind turbine belongs to the technical field of vibration reduction of wind driven generators, and is characterized by comprising a blade integration unit and a tower drum tuning unit, the blade integration unit adopts a cylindrical particle damping cavity, the center of the cylinder is connected with a mass ball through a spring, and the cavity is filled with damping particles; the steel wire rope is fixed in the blade to restrain vibration displacement; the tower tube tuning unit is connected with the mass block through a steel wire rope, the mass block is circumferentially provided with the springs and connected with the tower tube wall, the lower portion of the mass block is connected with the mass ball, and the upper periphery and the lower periphery of the mass block are connected with the tower wall through the hydraulic inerter dampers. And the working space is obviously reduced, the multi-direction vibration control capability is improved, and the method is suitable for vibration control of offshore wind turbine towers and blades.

To provide an impact absorption device that can be reused by reverting a holder after use, and that is less likely to generate a repulsive force because impact is absorbed by a friction force generated at the time of press fitting of a columnar member.SOLUTION: An impact absorption device includes: a plate-shaped holder 3 which is detachably assembled to a frame body 2; and a columnar member 4 provided on the holder 3. The holder 3 has a through hole 3a open thereon. Both of one face and the other face of the holder 3 can be assembled to the frame body 2. With one end part 41 side of the columnar member 4 being disposed in the through hole 3a and the other end part 42 side of the columnar member 4 extending to an opposite side of the frame body 2, when an external force toward the one end part 41 side is applied to the other end part 42 side of the columnar member 4, the one end part 41 of the columnar member 4 is displaced toward the side of the frame body 2 and a middle part of the columnar member 4 is press-fitted into the through hole 3a.SELECTED DRAWING: Figure 1

The invention discloses a multifunctional integrated cooling and safety protection device for underground heat damage treatment. The multifunctional integrated cooling and safety protection device comprises a walking mechanism, a protection shell, a cooling mechanism, a monitoring mechanism, a standby power supply, an emergency material storage cabinet and an ice maker. The device can be flexibly arranged underground and quickly deployed to an underground heat damage area, the energy consumption is lower, and the real-time adjustment delay and hysteresis of the underground temperature are avoided. In the heat damage treatment process, the sound fatigue influence of noise factors on underground miners is fully considered, the noise level is effectively reduced in the equipment operation process, and a relatively quiet operation environment is provided for the underground miners. Aiming at potential operation risks existing in a well, environment monitoring and alarming functions are particularly added, meanwhile, emergency self-rescue and safety protection functions are provided, a temporary safety environment can be provided for miners in an emergency, the survival probability of the miners is increased when dangers occur, and the safety of the miners is improved. Finally, a downhole operation safety guarantee system integrating cooling, noise reduction, environment monitoring and alarming functions is formed.

In order to achieve all the purposes mentioned above and that will emerge from the detailed description below, the present invention is related to a vibration energy damping mechanism (10) having at least one fixing element (20) that can be connected with at least one first structural member (90) and at least one second structural member (100) in order to increase the resistance of structures against events that cause vibrations, such as earthquakes. Accordingly, its novelty is that it comprises at least one plate (30) configured between said at least two fixing elements (20), and in order to increase the load capacity and energy damping capacity of the structural system by increasing the displacements as a result of vibrations, it comprises at least two friction regions (I) having at least one disk (40) providing damping as a result of friction by being positioned between at least two elements that have the degree of freedom to move relative to each other during vibration.

A damping shock absorber includes a pipe and a plurality of shock absorbers configured on the pipe. The shock absorber includes a main body sleeved on the outer periphery of the pipe and a damping medium filled in the main body. The main body is provided with an inner cavity, and the inner cavity is divided into a plurality of chambers for placing the damping medium separately. A method for designing the damping shock absorber, wherein the main body is filled with the damping medium, such that the shock of the pipe or a shaft body is reduced, ensuring the smooth operation of the pipe or the shaft body, and further ensuring the safety and efficiency of the pipe or the shaft body in a working process. The damage to the pipe or the shaft body and the shock interference to other linked apparatuses are greatly avoided.

The invention discloses a swing check valve, and particularly relates to the technical field of valves, the swing check valve comprises a valve body, a valve cover, a support piece, a bolt shaft, a rocker, a valve clack and a limiting block, and further comprises a damping assembly. Through the arrangement of the damping assembly, a driving plate can be pushed to drive a second piston to extrude gas in a driving cavity into two driven cavities while a valve clack is opened, so that two second mounting plates drive corresponding friction blocks to move in the direction of a corresponding first mounting plate; the friction block can be in contact with the first friction plate or the second friction plate to generate a rotary damping effect, the valve clack cannot directly overcome friction force to deflect under the condition of large-flow pulsating flow, repeated oscillation of the valve clack is avoided, the service life of the valve is prolonged, the closing speed of the valve clack can be slowed down under the condition of small-flow pulsating flow, and the service life of the valve is prolonged. Damage caused by quick closing of the sealing face of the valve clack is avoided, and the service life of the valve is further prolonged.

The invention discloses a multi-pendulum-type particle tuned damper and a vibration reduction method thereof. The problems that a traditional tuned mass damper (TMD) is poor in robustness, narrow in vibration reduction frequency band and difficult to adapt to the complex and changeable vibration environment of an offshore wind power tower drum are solved. According to the damper, the supporting plate is hung through the flexible traction component to form a pendulum type tuned mass unit, the N-order inherent frequency of the pendulum type tuned mass unit is tuned to be matched with the N-order inherent frequency of a tower barrel, and efficient resonance energy absorption of main frequency vibration is achieved; meanwhile, the particle filling box is arranged on the supporting plate, the swinging type unit swings to drive particle materials to generate violent relative movement, and broadband vibration energy is widely dissipated through inelastic collision and friction. According to the application, the adaptability, the robustness and the overall vibration reduction efficiency of the damper in a severe marine environment can be remarkably improved.

An apparatus is provided. The apparatus includes an equipment support structure configured to support a semiconductor fabrication component. The apparatus includes a damper assembly configured to resist a lateral force induced by a seismic event to the equipment support structure. The damper assembly includes a gear rack coupled to the equipment support structure. The damper assembly includes a first flywheel assembly including a first mass damper flywheel and a first gear meshed with the gear rack and selectively engaged with the first mass damper flywheel.

The invention discloses a horizontal floating raft vibration isolation device, and belongs to the technical field of floating raft vibration isolation. The first vibration isolation assembly is detachably connected to the two sides of the lower end of the buoyant raft body through the fixing assembly, the first vibration isolation assembly is movably provided with a plurality of steel wire rope rings, and the first vibration isolation assembly isolates vibration through the steel wire rope rings; the second vibration isolation assembly comprises a plurality of anechoic tiles, the multiple anechoic tiles are glued to the upper end of the buoyant raft body, and multiple cavities are formed in the bottom faces of the multiple anechoic tiles; the third vibration isolation assembly is fixedly connected into the lower end of the buoyant raft body; the bottom of the first vibration isolation assembly and the bottom of the third vibration isolation assembly are both fixedly connected with the base. Multiple vibration isolation modes such as steel wire rope ring vibration isolation and anechoic tile vibration isolation are adopted for vibration isolation, and the vibration isolation effect is enhanced.

The present invention relates to a flexible energy-absorbing structure based on the interactive motion of a group of magnetic elements. The structure comprises a magnetic particle element structure and an external flexible wrapping membrane. The magnetic particle element structure comprises multiple magnetic particle elements, which are filled within the external flexible wrapping membrane, which is sealed using a hot melt method. Compared with existing technologies, the present invention offers advantages such as lightweight, high impact resistance, extensive design and performance control options, strong environmental adaptability, and excellent self-repair capabilities. It is widely applicable to applications such as aircraft impact-resistant structures and vibration-damping protective structures.

A damper device includes: a cylinder; a rod; a piston having an annular groove; a seal ring; and a friction member. A seal portion is formed between the cylinder and the piston. When the piston moves in a damper braking direction, the seal ring is configured to press the friction member to expand the friction member in diameter, and an outer peripheral surface of the friction member is configured to be brought into pressure contact with an inner peripheral surface of the cylinder. The friction member is formed to be smaller than a size of the inner peripheral surface of the cylinder when no pressing force is applied from the seal ring.

The present invention discloses a vibration reduction and isolation system based on a particle damper and a vibration isolator, which is used to improve the vibration isolation effect of a vibration device and a vibration isolation surface, and includes a device body of the vibration device; a particle damper, which is arranged on the device body, and the particle damper is filled with damping particles to convert the low-frequency vibration of the device body into high-frequency particle motion; a vibration isolator, which is arranged between the device body and the vibration isolation surface, and the damping particles inside the particle damper perform high-frequency particle motion, thereby improving the overall vibration frequency of the system composed of the particle damper and the vibration isolator, increasing the upper excitation frequency of the vibration isolator, and effectively improving the vibration isolation effect of the vibration isolator; at the same time, the particle damper can also absorb a part of the vibration energy, further enhancing the vibration reduction and isolation effect. This design has a better effect than using a particle damper alone for vibration reduction and isolation or using a vibration isolator alone for vibration reduction and isolation.

The present invention provides one or more carrier devices capable of varying contact damping with pressured displacement. The device is configured to be installed on mechanical force-receiving structures that have rolling wheels, rolling balls or slidably displaceable terminal block structure, carrying devices and transportation devices for humans or objects. When receiving pressure smaller than a set value, the device provides low contact damping and is thus easy to move. On the other hand, when receiving pressure greater than the set value, it provides high contact damping so as to prevent slip and thereby ensure safe placement. In addition, when receiving pressure smaller than the set value, the device has its pre-stressed structure generate modulation to displacement corresponding to the size of the pressure it receives for the purpose of shock absorbency.

A power wheelchair includes a frame, a powertrain including a motor, gearbox, and powertrain suspension coupled to a drive wheel. The powertrain suspension includes a powertrain mount connected to the motor. The mount is pivotally connected to and resiliently supported by an upper link and a lower link for movement of the drive wheel relative to the frame. The power wheelchair further includes a base suspension connected between the frame and the caster support arms. The base suspension is dynamically controllable to vary caster suspension movements in response to sensor outputs to reduce pitching motions.