431results about "Vibration dampers" patented technology

A double-liquid vibration-damping liquid-shaking tank for a wind turbine tower drum oriented to source network load storage coordination belongs to the technical field of wind turbine vibration-damping equipment, is a liquid-shaking damping structure externally arranged on a wind turbine main body, and comprises a wind direction plate and a liquid-shaking tank structure consisting of an annular liquid-shaking tank, a liquid partition plate, upper-layer liquid and lower-layer liquid, and the turntable fixing structure consists of a rotor and a rotor flange plate. The annular liquid shaking cabin is provided with a central through hole, is sleeved on the tower drum, is internally provided with a liquid partition plate, and is filled with two-phase liquid which has density difference and is immiscible with each other; the wind direction plate is arranged on the outer side of the annular liquid shaking cabin; the liquid shaking damping structure is fixed to the wind turbine tower fixing section through the rotor flange plate. Single shaking liquid is replaced by stably layered immiscible double liquid, the vibration reduction effect of the shaking liquid damping structure is improved, and the shaking liquid damping structure is accurately adaptive to all working conditions; and through linkage of the wind direction plate and the liquid partition plate, the vibration reduction effect of the shaking liquid damping structure is improved, the resonance effect is restrained, and the stability of the vibration reduction effect of the shaking liquid damping structure is enhanced.

The invention provides an electromagnetic quasi-zero stiffness vibration isolator and a control method, and belongs to the technical field of vibration isolation. The vibration isolator comprises a base, a positive stiffness mechanism, a negative stiffness mechanism, a positive and negative stiffness connecting mechanism and a dynamic control module. The positive stiffness mechanism adopts a hydraulic spring to provide basic positive stiffness; the negative stiffness mechanism comprises a plurality of stator units distributed on the base in an annular array and a rotor suspended in the center of a magnetic field of the stator units, and is used for generating nonlinear negative stiffness; the top end of the hydraulic spring supports a load through the bearing table and keeps a preset gap with the inner wall of the rotor; the positive and negative stiffness connecting mechanism realizes displacement transmission and cooperative adjustment; the dynamic control module comprises a displacement sensor and a controller, the sensor collects displacement signals, and the controller adjusts excitation currents of the stator units according to the signals and dynamically adjusts electromagnetic force, so that the vibration isolator is kept in a quasi-zero stiffness state. The quasi-zero stiffness state can be still kept when the load changes, load self-adaption low-frequency vibration isolation is achieved, and the system stability and the vibration isolation performance are improved.

The invention discloses a TLD damping platform for take-off and landing of a large unmanned aerial vehicle. The TLD damping platform comprises a take-off and landing platform, a water tank, a lower supporting device, a connecting device and an upper supporting device. The lifting platform is located at the top end of the water tank. The lower supporting device is located below the water tank, and an upper supporting device is arranged between the bottom end of the water tank and the lower supporting device; the side face of the water tank is connected with the lower supporting device through an obliquely-arranged connecting device. The connecting device and the upper supporting device are arranged between the water tank and the lower supporting device, so that vertical impact force generated by taking off and landing of the unmanned aerial vehicle can be effectively absorbed and dispersed, and vertical vibration of the take-off and landing platform is weakened; when the water tank deviates in the horizontal direction, horizontal vibration energy can be further dissipated through the obliquely-arranged self-resetting compression rod, and resetting of the water tank and the lifting platform is promoted.

The invention provides an electromagnetic quasi-zero stiffness vibration isolation device and method based on a composite nested structure, and belongs to the technical field of vibration isolation. The device comprises a supporting base, two linear induction motor assemblies symmetrically arranged on the base and provided with a preset gap, and a suspension supporting frame composed of a vertical conductive supporting plate and a horizontal magnetic conductive supporting plate. The vertical conductive supporting plate can float up and down in the gap and forms a positive stiffness module for providing main supporting force and positive stiffness with the motor assembly, and the two eddy current stator pairs are symmetrically distributed on the left side and the right side of the horizontal magnetic conductive supporting plate and form a negative stiffness module for providing negative stiffness with the horizontal magnetic conductive supporting plate; each eddy current stator pair comprises an upper eddy current stator assembly and a lower eddy current stator assembly which are mutually exclusive up and down and float on the upper side and the lower side of the horizontal magnetic conductive supporting plate; the positive and negative stiffness modules are coaxially arranged and cooperate in parallel through a composite nested structure to realize the quasi-zero stiffness characteristic; the rigidity can be dynamically adjusted, and the vibration isolation effect and reliability are improved.

An actuator for a head-up display, includes a link attached to one end of an aspheric mirror, a driving force transmission including a lead screw to move the link, a driver to allow the lead screw to rotate along the axis of rotation of a motor as the motor is driven, a motor bracket disposed on top of the motor and attached to the driver to support the driver, a top motor mount disposed on the top of the motor, a bottom motor mount disposed on the bottom of the motor, a vibration damping part disposed between the top motor mount and the motor bracket, to absorb vibration from the motor, and a cantilever type dynamic vibration absorber disposed on both ends of the bottom motor mount, to absorb vibration from the motor.

A drive mechanism for use with an electric motor and a clutch mechanism includes a rotor shaft, a disconnect shaft, a disconnect mechanism, at least one damper element, and a part of a clutch. The rotor shaft and disconnect shaft have a longitudinal axis A. The disconnect shaft transmits torque between the rotor shaft and the clutch mechanism. The disconnect shaft comprises the part of the clutch and a shaft element. The disconnect mechanism is configured to move the disconnect shaft between an engaged position in which the part of the clutch is engaged with the clutch mechanism and a disengaged position in which the part of the clutch is not engaged with the clutch mechanism. The at least one damper element is configured to absorb at least part of any kinetic energy introduced into the disconnect shaft due to movement of the disconnect shaft.

A dual-liquid vibration damping sloshing chamber for wind turbine towers, oriented towards source-grid-load-storage synergy, belongs to the technical field of wind turbine vibration damping equipment. It is a sloshing damping structure externally mounted on the wind turbine body, including a wind vane, a sloshing chamber structure consisting of an annular sloshing chamber, liquid baffles, upper liquid, and lower liquid, and a turntable fixing structure consisting of a rotor and rotor flange. The annular sloshing chamber has a central through hole, is fitted onto the tower, contains liquid baffles, and is filled with two immiscible liquids with different densities. The wind vane is arranged outside the annular sloshing chamber. The sloshing damping structure is fixed to a fixed section of the wind turbine tower via the rotor flange. This invention improves the vibration damping effect of the sloshing damping structure by replacing a single sloshing liquid with a stable, layered, immiscible dual liquid, accurately adapting to all operating conditions. Through the linkage of the wind vane and liquid baffles, the vibration damping efficiency of the sloshing damping structure is improved, the generation of resonance effects is suppressed, and the stability of the vibration damping effect of the sloshing damping structure is enhanced.

The present application belongs to the field of ultra-precision vibration reduction, and discloses a precision active vibration reducer compatible with a vacuum environment, comprising: a top plate, a bottom plate, and a vibration reduction unit, wherein the vibration reduction unit comprises a passive vibration reduction unit and an active vibration reduction unit connected in parallel, the active vibration reduction unit being arranged between the top plate and the bottom plate and being located outside the air spring, and the passive vibration reduction unit comprising a coaxial and vertically arranged air spring and a magnetic negative stiffness spring; the air spring comprises a main air chamber, the bottom of the main air chamber being connected to a metal sealing bellows, the top of the main air chamber being flexibly connected to the top plate; the bottom end of the metal sealing bellows being sealed and fixed to the bottom plate, so that the main air chamber becomes a vacuum-sealed cavity; the magnetic negative stiffness spring being arranged in the air spring, and its top end being fixed to the upper wall of the cavity, and its bottom end being flexibly connected to the bottom plate. The present application has excellent vibration isolation performance and good adaptability to a vacuum environment, and can meet the vibration isolation requirements of equipment such as EUV lithography machines.

A server including a server casing, an electronic module and a damping mechanism is provided. The electronic module is detachably disposed in the server casing along a sliding direction. The damping mechanism includes a bracket and a stop assembly. The bracket is slidably disposed on the server casing along the sliding direction. The stop assembly is pivotally disposed on the bracket. In response to an impact force of the electronic module to the bracket being greater than a predetermined value, the stop assembly is positioned at the server casing.

The invention discloses a self-adaptive propeller hanging system and a damping control method, and belongs to the technical field of heavy component hoisting. The system comprises a main heavy frame, a universal hinge mechanism and a self-adaptive hydraulic damping unit, the self-adaptive hydraulic damping unit comprises a cylinder barrel, a valve element and a self-adaptive valve set, one end of the valve element is connected with a propeller assembly, and the self-adaptive valve set is used for dynamically adjusting hydraulic motion resistance acting on the valve element when the lifting posture of a propeller is changed. According to the damping control method, a target damping adjusting mode is judged through posture and pressure parameter fusion, switching among a reference damping mode, an impact suppression damping mode and a locking damping mode is achieved, and automatic resetting is achieved through a spring after the locking state is relieved. According to the scheme, swing and impact of the propeller in the hoisting process can be effectively restrained, and the hoisting stability and safety are improved.

The invention discloses a damping-adjustable inerter shock absorber which comprises an inerter and a magneto-rheological shock absorber, the lower end of the inerter is connected with the upper end of the magneto-rheological shock absorber, the inerter comprises a ball screw (1) and a ball nut (2), and the magneto-rheological shock absorber comprises a base, an outer cylinder barrel (4), a piston (5) and a rotating barrel (6). The upper end of the rotating cylinder (6) is fixedly connected with the ball nut (2), the piston (5) and the outer cylinder barrel (4) are both fixedly arranged on the base, the lower end of the rotating cylinder (6) is connected with the outer cylinder barrel (4) in an inserted mode, the piston (5) is located in the rotating cylinder (6), and magnetorheological gel is filled among the outer cylinder barrel (4), the piston (5) and the rotating cylinder (6). The damper has the advantages of attenuating the vibration amplitude and accelerating the attenuation rate at the same time, and has a wide damping adjustable range.

The invention discloses a high dynamic response electromagnetic damping system, and relates to the technical field of dampers. Through cooperation of the sealing driving electromagnet and the resettable tension spring, instantaneous opening and closing of the circulation path of the inner cylinder and the outer cylinder are achieved; the two working modes of gear damping and stepless damping are switched, only the electromagnet needs to be cut off or excited, a valve element does not need to be mechanically inserted and pulled, the dynamic response time can be compressed to the millisecond level, and the high-frequency vibration suppression capacity and the system reliability are greatly improved; a blade-worm gear-motor closed-loop servo structure is adopted, a force sensitive resistor senses the direction and the size of oil flow in real time, and the rotating speed of the blade can be continuously adjusted within the resistance coefficient of 0-100% through a control algorithm; compared with a magnetorheological fluid type scheme depending on magnetic induction shearing, the problems of temperature drift and ferromagnetic particle deposition are solved, and the damping linearity and repeatability are ensured.

The invention discloses an electromagnetic permanent magnet hybrid quasi-zero stiffness energy feedback vibration isolator which comprises a bearing support, positive stiffness spring mechanisms, an electromagnetic negative stiffness mechanism and a pre-pressing spring mechanism, the multiple positive stiffness spring mechanisms are arranged on the outer ring in the bearing support, and the electromagnetic negative stiffness mechanism is arranged in the bearing support. According to the quasi-zero stiffness vibration isolator, the quasi-zero stiffness characteristic is achieved through parallel connection of negative stiffness permanent magnetic force and positive stiffness spring force, dynamic adjustment of the stiffness is achieved through electromagnetic force so that the vibration isolation system can reach the quasi-zero stiffness more accurately, and therefore the vibration isolation effect of the vibration isolator is improved. And meanwhile, an energy feedback coil is additionally arranged in the vibration isolator, and energy generated in the vibration process is converted into electric energy to be recycled, stored and utilized.

The invention discloses a bidirectional damping device between flexible photovoltaic support rows, and the bidirectional damping device is installed between adjacent single-layer flexible photovoltaic supports, and comprises an adjustable damper and two springs. The two springs are arranged on the two sides of the adjustable damper respectively, and meanwhile the two springs are fixedly connected with the bearing cable steel strands of the adjacent single-layer flexible photovoltaic supports respectively. Vibration in the axial direction and the tangential direction can be controlled and reduced at the same time.

The adjustable inertia connecting rod vibration isolation device comprises a vibration isolation base, a vibration isolation platform, a connecting rod mechanism and a spring element, the connecting rod mechanism comprises two sets of connecting rod assemblies which are in bilateral symmetry, each connecting rod assembly comprises an upper connecting rod and a lower connecting rod, and the upper connecting rods and the lower connecting rods are hinged through bearings; each connecting rod assembly is connected with the vibration isolation platform and the vibration isolation base through bearings. The spring element comprises a compression spring and an extension spring, and the compression spring is vertically arranged between the vibration isolation base and the vibration isolation platform; the extension spring is horizontally connected with bearing joints of the left and right symmetrical connecting rod assemblies; an upper connecting rod and a lower connecting rod of the connecting rod assembly extend outwards along a connecting point to form a lever arm, a plurality of mass block mounting holes are formed in the tail end of the lever arm, and mass blocks with different masses can be detachably mounted. A parallel stiffness structure is formed through the compression spring and the extension spring, the mass size and the mounting position of the mass block are adjusted on the lever arm, and ultralow-frequency quasi-zero stiffness band gap vibration isolation is cooperatively achieved.

An annular cantilever beam spring is capable of exhibiting low friction and hysteresis and stiffness and specifically stiffness / volume far exceeding currently available COTS springs. The spring includes first and second sets of N stand-offs evenly positioned around opposing top and bottom surfaces of a flat annular beam at 360 / N degree intervals and angularly offset with respect to each other by 360 / 2N degrees such that each said stand-off is evenly spaced between adjacent pairs of stand-offs on the opposing surface. The first and second sets of stand-offs are responsive to opposing axial loads to deflect the flat annular beam axially at each stand-off in opposing directions to induce a curvature to the annular beam and store energy in the beam. The spring stiffness is determined by the elastic material properties of the flat annular beam, not the initial geometry as is common with the COTS springs.

A compliant mount for an aircraft, for attaching equipment (such as a latching unit, for example) to a structural member of the aircraft, the compliant mount comprising: a mounting member for attachment to the structural member of the aircraft; a receptacle for supporting the equipment, the receptacle being coupled to the mounting member along a longitudinal axis; and one or more spring elements arranged to resiliently bias the receptacle into alignment with the longitudinal axis and to allow angular movement of the receptacle away from the longitudinal axis. Also provided is an aircraft equipment assembly comprising such a compliant mount, and aircraft equipment supported by the receptacle, and an aircraft having one or more such equipment assemblies. The aircraft may be a folding wingtip aircraft and the equipment assembly may be part of a folding wingtip actuation mechanism.

A rotor lift assembly for a milling machine includes a first rotor lift arm, a second rotor lift arm, a cross tube, and one or more vibration damping members. A first end of the cross tube is connected to the first rotor lift arm. A second end of the cross tube is connected to the second rotor lift arm. One or more damping members are connected to the transverse tube. One or more damping members may be disposed within the interior of the cross-tube. A first end of the cross tube may be connected to the first rotor lift arm via a first set of one or more damping members, and a second end of the cross tube may be connected to the second rotor lift arm via a second set of one or more damping members.

The invention discloses a quasi-zero stiffness sound array vibration isolation device for an unmanned aerial vehicle. The quasi-zero stiffness sound array vibration isolation device comprises a positive stiffness component and a negative stiffness component. The positive stiffness component is a steel spring, the upper end is connected with the unmanned aerial vehicle connecting piece, and the lower end is connected with the negative stiffness component; the negative stiffness component comprises a cylindrical permanent magnet and an annular permanent magnet, the cylindrical permanent magnet is located in an annular space of the annular permanent magnet after the acoustic array is mounted, and the cylindrical permanent magnet and the annular permanent magnet are in a mutual exclusion state; the steel spring, the cylindrical permanent magnet and the annular permanent magnet jointly form a quasi-zero-stiffness structure, and the quasi-zero-stiffness structure is located at a static balance position under the gravity effect of the sound array and stores elastic potential energy. When the unmanned aerial vehicle is disturbed by vibration transmitted by the unmanned aerial vehicle, the negative stiffness component releases elastic potential energy and generates acting force opposite to the disturbance direction so as to counteract vibration transmission. The device has the advantages of simple structure, suppression of vibration of the unmanned aerial vehicle and transmission of aerodynamic noise to a sound array, and the like.

This invention belongs to the field of vibration reduction technology for nuclear power plant fans, specifically relating to a high-damping integrated vibration reduction foundation suitable for nuclear power fan fans. It consists of a steel frame connected to a height-adjustable vibration damper. The steel frame is welded from high-damping composite channel steel, which is composed of conventional channel steel and particulate dampers. The height-adjustable vibration damper uses the housing as the installation reference. An upper annular metal rubber is inserted into its inner cavity, followed by the upper end of the mandrel being inserted into the inner hole of the upper annular metal rubber. Then, a lower annular metal rubber is inserted into the inner cavity of the housing, with its upper end face against the mandrel. A base is then placed on top, and rivets are used to connect the base and housing through four mounting holes. Finally, the internal thread of the mounting block is screwed into the external thread at the upper end of the mandrel. This invention effectively reduces the vibration level of the fan, ensuring safe operation of the fan.

The invention discloses a magneto-rheological damping spring vibration isolator, which relates to the technical field of dampers and comprises an upper shell and a lower shell, vibration isolation springs are distributed between the upper shell and the lower shell, an oil cylinder is arranged in the center of the lower shell, a cavity is formed in the oil cylinder, a piston is arranged in the cavity, a gap is reserved between the oil cylinder and the piston, and the magneto-rheological damping spring vibration isolator further comprises an auxiliary opening. An auxiliary opening is formed in the piston, an iron core is fixedly arranged in the auxiliary opening, the magnet exciting coil is arranged on the outer side of the iron core, the outer portion of the magnet exciting coil is connected with a control circuit, and the magnet exciting coil is used for controlling the damping of the spring vibration isolator. The damping response speed is increased, the effective action size is reduced in the working state, energy consumption is reduced, when the piston moves to a certain degree due to external impact, the limiting rod and the coil form mechanical contact, displacement is automatically limited, and therefore the effect of protecting circuit components is achieved.

The invention generally relates to an active vibration isolator having a coil spring which acts in a vertical direction. The invention also relates to a method for actively damping vibrations of a mounted load, for example a mounted machine, system or device.For this purpose, there is provided a vibration isolator having an inner housing with a cavity for receiving and holding a coil spring which is arranged in the cavity of the inner housing and acts in a vertical direction, and also an outer housing at least partially surrounding the inner housing. Between the inner housing and the outer housing there is arranged an actuator which acts in a vertical direction.

A spring return cartridge for a rotary actuated valve includes a torsion spring having a spring load intermediate portion extending between a first end and a second end, and a spring carrier covered by the torsion spring. The spring carrier includes a first portion rotatably fixed to the first end of the torsion spring and a second portion rotatably coupled to the second end of the torsion spring. The second portion of the torsion spring is rotatable relative to the spring carrier and relative to the first end of the torsion spring between a first rotational limit position and a second rotational limit position. The intermediate portion of the torsion spring biases the second end of the torsion spring to the first rotational limit position and maintains a spring loaded state at the first rotational limit position.

The present invention relates to an inertia-superdamping coupled synergistic unit cell and local resonance metamaterial. The frame includes an inner shell and an outer shell. The positive stiffness-negative stiffness unit includes a second slider, a first slider, and a second connecting rod. The second slider slides and extends into the inner shell. The first slider is provided in the inner shell. The extended end of the second slider is hinged to the first slider via the second connecting rod, and the extended end is fixedly connected to the outer shell via an elastic rod. The other end of the inner shell extending from the second slider is fixedly connected to the outer shell via an elastic rod. The second connecting rod is configured as a diamond-shaped connecting rod mechanism including four mutually hinged connecting rods. The lever rotation inertia unit includes a first connecting rod and a sector disk. The sector disk is rotatably provided in the inner shell. The other end where the first slider and the second slider are hinged is hinged to the sector disk via the first connecting rod. The eddy current superdamping unit includes magnets, and the sector disk is provided between the magnets. Compared with the prior art, the present invention can achieve synergistic control of structural vibration under broadband multi-dimensional excitation.

The damping-adjustable pull rod comprises an outer rod and an inner rod which are matched with each other, the inner rod is coaxially nested in the outer rod and can slide relatively, a fixing screw is sleeved between the outer rod and the inner rod in a matched mode, and an annular cavity is formed between the outer rod and the inner rod. A first damping spring and a second damping spring are installed at the two ends of the annular cavity respectively, a supporting ring is arranged in the middle of the annular cavity and located between the first damping spring and the second damping spring, the supporting ring is connected with the outer wall of the head of the inner rod through threads, and an elastic ring is installed on the outer surface of the supporting ring in a matched mode; the outer surface of the supporting ring is in interference fit with the inner wall of the outer rod through the elastic effect, continuous friction resistance is generated, damping can be provided in the whole telescopic movement process, particularly, effective buffering is provided at two limiting positions, stable friction damping is provided in the middle stroke, and the damping size can be adjusted according to actual needs.

A pendulum weight for a centrifugal pendulum absorber for a flywheel of a vehicle (3), comprising: - at least one bearing surface configured to, when the pendulum weight is mounted radially outside of a central axis of the pendulum absorber, cooperate with at least one corresponding bearing surface provided on a separate part of the pendulum absorber, with respect to which separate part the pendulum weight is thereby configured to be movable along a predetermined pendulum path, - at least one pocket formed in connection with the bearing surface, the pocket being configured to receive at least a portion of the separate part when the pendulum weight moves along the pendulum path, wherein the pendulum weight comprises an outward portion and a separate inward portion which are assemblage to form the pendulum weight, the outward portion being configured to be located radially outside of the inward portion with respect to the central axis when mounted, wherein the bearing surface and the pocket are both provided on one of said portions.

The linear moto includes a bracket, two elastic support modules, a driving assembly, and a motion assembly suspended above the driving assembly. The driving assembly is mounted on the bracket and configured to drive the motion assembly to reciprocate in a predetermined direction. The motion assembly has two ends in the predetermined direction, two elastic support modules are configured to connect the two ends to the bracket, respectively. Each of the two elastic support modules includes a plate spring sheet, an adapter assembly, and a first connection member, the plate spring sheet has a first connection end and a second connection end, the first connection end is fixedly connected to the motion assembly, the first connection member extends through and connects to the second connection end and the adapter assembly, the plate spring sheet is fixedly connected to the bracket via the adapter assembly.

The invention discloses a vehicle oil-gas interconnection suspension system, a circulation switching type four-position eight-way valve and a vehicle, the vehicle oil-gas interconnection suspension system comprises a left front suspension hydraulic cylinder, a right front suspension hydraulic cylinder, a left rear suspension hydraulic cylinder and a right rear suspension hydraulic cylinder, each of the left front suspension hydraulic cylinder, the right front suspension hydraulic cylinder, the left rear suspension hydraulic cylinder and the right rear suspension hydraulic cylinder is provided with a piston rod, a cylinder body, a first cavity and a second cavity, one end of each piston rod is used for being connected with a vehicle frame, and each cylinder body is connected with an axle; the circulating switching type four-position eight-way valve comprises a first valve body, a second valve body and a rotary valve element, the first valve body and the second valve body are symmetrically arranged relative to a first plane, and the rotary valve element is arranged between the first valve body and the second valve body; the first valve body and the second valve body are each provided with four working oil ports in a penetrating mode in the first direction. The rotary valve element can rotate around the axis, and circulating switching of four positions is achieved. The rotary valve element is matched with the movable valve element, opening and closing of an oil way are accurately controlled, and the control reliability of the complex oil way is improved.