308 results about "Vibration absorption" patented technology

A vibration absorber arrangement (1) is provided, in particular for tall slender structures, comprising a supporting structure (8), an absorber mass (2) which comprises a center of mass (3), and at least one wheel (4, 5) by means of which the absorber mass (2) is movable on a concavely curved rail arrangement (6), which is connected to the supporting structure (8), from a stable central position in two opposite directions, wherein a friction damper device (9) is provided. One wants to be able to adapt such a vibration absorber arrangement in a simple manner to different operating requirements. For this, it is provided that the friction damper device (9) is adjustable between a first state, in which it does not interact with the absorber mass (2) or only dampeningly, and a second state, in which it controlledly brings a movement of the absorber mass (2) to a standstill.

According to the multi-connecting-rod type automobile suspension device, through cooperative cooperation of a multi-connecting-rod assembly, a damping support, an axle and a damping assembly, wheel vertical vibration caused by the road surface can be efficiently converted into a multi-connecting-rod swing vector, and self-adaptive damping adjustment is achieved by means of a damper and air cylinder composite structure in the damping assembly; impact can be effectively buffered in the compression stroke, springback can be restrained in the stretching stroke, it is ensured that tires continuously grip the ground, meanwhile, sound insulation materials are additionally arranged at the ends of the dampers, running noise is effectively reduced, impact energy in the vertical direction is further absorbed by integrating multiple sets of spiral springs through a drive axle, rigid transmission to an automobile main frame is reduced, and the service life of the automobile is prolonged. The whole structure is high in rigidity and reasonable in spatial arrangement, and has good vibration absorption performance, reliability and comfort, and the driving smoothness, the control stability and the noise vibration comfort of a vehicle are remarkably improved.

The invention discloses an optical thermostat with comprehensive vibration reduction and low-temperature in-situ displacement functions, which adopts upper and lower opposite vibration absorbers and a large-mass base to realize first-order to second-order inertial vibration absorption, and further realizes thorough decoupling with an optical platform in a suspension type non-contact manner, and the vibration transmissibility can be reduced to be less than 10%. Resonant frequencies of two systems (a sample table system and a cold head system) are designed to achieve vibration decoupling. The technical problems that in the prior art, the high-grade vibration isolation capacity is insufficient, refrigerator noise is easily coupled to a measuring light path, the low-temperature in-situ precision displacement capacity is lacked, and the contradiction between heat isolation, convenience and cost is difficult to balance can be solved. Under the support of a conventional GM refrigerator, the comprehensive requirements of ultralow basic vibration, strong decoupling of a measurement light path, low-temperature in-situ micron-sized displacement, convenient sample replacement and efficient refrigeration / thermal control are met at the same time.

The invention relates to a piezoelectric type negative stiffness collaborative vibration absorption supporting rod for a helicopter rotor dynamic load. The piezoelectric type negative stiffness collaborative vibration absorption supporting rod comprises an upper supporting rod body, a lower supporting rod body and a vibration absorption assembly which is arranged between the upper supporting rod body and the lower supporting rod body and used for vibration isolation. The vibration absorption assembly comprises an auxiliary circular ring used for bearing a static load, a lever spring and a disc spring used for providing negative stiffness and adjustable pre-compression are arranged in the auxiliary circular ring, and a mass block used for absorbing and dissipating vibration energy is arranged below the disc spring; the two sides of the lever spring make contact with the piezoelectric ceramic stack, the piezoelectric ceramic stack is connected with the multi-mode external circuit module, the multi-mode piezoelectric shunt damping effect is formed, and meanwhile a plurality of mode components of the system are controlled. When vibration is large, electric energy is stored, and when vibration is small, the mode is switched to a multi-mode RLC circuit dissipation mode, and mechanical vibration energy is converted into electric energy which is consumed through the circuit. Negative stiffness dynamic low-frequency broadband vibration absorption and piezoelectric shunt multi-mode suppression are coupled, and the effect of efficient vibration isolation is achieved.

The application discloses an adjustable nonlinear dynamic vibration absorber and system, and has the technical scheme that a tuning mass block is slidably connected to the surface of a support plate, and first scissor structures are rotatably connected between the tuning mass block and the two ends of the support plate; the first scissor structures are provided with second scissor structures and dampers, the second scissor structures and the dampers can drive the first scissor structures to stretch and contract through elastic belts, the second scissor structures are provided with elastic elements for driving the second scissor structures to stretch and contract; the stretching direction of the elastic elements is parallel to the sliding direction of the tuning mass block, and is perpendicular to the damping direction of the dampers, so that the first scissor structures and the second scissor structures can realize vibration absorption through geometric nonlinearity when moving. The stiffness and damping characteristics of the application can be adjusted, and the linear elements can be used to realize nonlinear stiffness, damping and super-low natural frequency, and the problem of Duffing system instability that cannot be eliminated by traditional nonlinear vibration absorbers is solved.

The intermittent acoustic black hole broadband vibration absorption structure comprises a cylinder with a top plate at the top end, and a plurality of sets of acoustic black hole thin plate circumferential arrays are evenly arranged on the inner wall of the cylinder at intervals in the axial direction. Each group of acoustic black hole thin plate circumferential array comprises first acoustic black hole thin plates with large discontinuous angles and second acoustic black hole thin plates with small discontinuous angles, which are alternately arranged along the annular direction and are coplanar, and the acoustic black hole thin plates are arranged perpendicular to the inner wall of the cylinder; the first acoustic black hole thin plate and the second acoustic black hole thin plate are equal in inner diameter and outer diameter; the first acoustic black hole thin plates of the acoustic black hole thin plate circumferential arrays are correspondingly arranged in the axial direction, and the second acoustic black hole thin plates of the acoustic black hole thin plate circumferential arrays are correspondingly arranged in the axial direction to form a plurality of sets of acoustic black hole thin plate axial arrays. And in the acoustic black hole thin plate axial array, each acoustic black hole thin plate has the same discontinuous angle, and the inner diameter of each acoustic black hole thin plate is gradually reduced from the bottom end to the top end of the cylinder. The broadband vibration absorption effect can be achieved.

The invention discloses a multi-degree-of-freedom staggered active vibration absorption method and system, photoetching equipment and a storage medium. The method comprises the following steps: acquiring vibration data; determining vibration state parameters of each degree of freedom at the current moment based on the vibration data; on the basis of the vibration state parameters, according to a preset interleaving control strategy, control instructions for a plurality of actuator units are generated; and driving the actuator unit to generate corresponding active damping force based on the control instruction. The embodiment of the invention aims to overcome the technical defects of potential instability, high energy consumption and poor time-varying disturbance adaptability caused by control resource competition in a traditional multi-degree-of-freedom active vibration control system, so that more stable, more efficient and more adaptive vibration suppression is realized.

Vibration absorber (5), as a component for mounting an ultrasonic sensor (1) with a column-shaped ultrasonic microphone (4) extending in an axial direction parallel to a center line (CL), on a plate-shaped vehicle component (V3), which is arranged in the ultrasonic sensor (1) which is arranged between a sensor mounting device (7) and the ultrasonic microphone (4), wherein the sensor mounting device (7) surrounds a side surface (44a) of the ultrasonic microphone (4) in a vehicle-mounted state in which the ultrasonic sensor (1) is mounted on the plate-shaped vehicle component (V3), wherein the vibration absorber (5) comprises: a large diameter section (58) arranged between the ultrasonic microphone (4) and the sensor mounting device (7), contacting the ultrasonic microphone (4) and the sensor mounting device (7); and a small diameter section (59) which adjoins the large diameter section (58) in a circumferential direction surrounding the center line (CL) and is formed such that an outer diameter with reference to the center line (CL) is smaller than that of the large diameter section (58), where two large diameter sections (58) facing each other across the center line (CL); two small diameter sections (59) facing each other across the center line (CL); and a direction in which the two large diameter sections (58) positioned across the center line (CL) are arranged, and a direction in which the two small diameter sections (59) positioned across the center line (CL) intersect each other at right angles.

Vehicle (3) comprising a vibration absorber (1) which includes a mounting seat (2) for the vibration absorber (1). The mounting seat (2) for the vibration absorber (1) includes a seat body (100) and a shut-off valve (301). The seat body (100) is provided with a first flow passage (120), a second flow passage (130), and a third flow passage (140). The first flow passage (120) is configured to be connected to a working cylinder (210) of the vibration absorber (1), the second flow passage (130) is configured to be connected to an external oil pump, and the third flow passage (140) is configured to be connected to an external oil filling device. The shut-off valve (301) is connected accordingly to the first flow passage (120), the second flow passage (130) and the third flow passage (140).The shut-off valve (301) is configured to control whether the first flow passage (120) is connected to the second flow passage (130) or not, and / or to control whether the first flow passage (120) is connected to the third flow passage (140) or not.

The application provides a damping device, a parking air conditioner and a control method. The damping device comprises a vibration isolation frame, a connecting piece and a vibration absorber. The vibration isolation frame is used for being connected with an external mounting part. The vibration absorber is arranged on the vibration isolation frame and is connected with the external mounting part through the vibration isolation frame, so that the vibration isolation frame isolates the vibration between the external mounting part and the vibration absorber. The vibration absorber is also used for being connected with an external vibration piece, and the vibration absorber can generate a vibration absorption effect on the external vibration piece. The vibration isolation frame plays a role of vibration isolation. The damping device not only can isolate vibration but also can absorb vibration, and achieves a good damping and noise reduction effect on a liquid storage tank. Therefore, the vibration of the liquid storage tank is inhibited, the shaking of a compressor is reduced, and noise of the parking air conditioner is avoided.

The invention discloses a particle damping vibration absorption device applied to an airborne display module, which is characterized in that a particle damping vibration absorber unit is arranged on an airborne display unit, and the airborne display unit comprises a structural component, a liquid crystal screen component, an optical component, a circuit component and a backlight component, the structure assembly, the liquid crystal screen assembly, the optical assembly, the backlight assembly and the circuit assembly are arranged in sequence, and the man-machine interaction function can be achieved. According to the scheme, the particle damping vibration absorption device is simple in structure, particle damping vibration absorption is achieved by arranging the particle damping vibration absorber unit at the vibration response peak point on the airborne display unit, effective vibration absorption in the airborne severe environment is achieved through cooperation of an elastic element, damping particles and a damping pad in the particle damping vibration absorber unit, and the particle damping vibration absorption device is simple in structural form and convenient to use. The device has the characteristics of high reliability, simplicity and convenience in operation, easiness in maintenance, capability of meeting normal use in an airborne severe environment and the like, and can effectively reduce the vibration response peak value on the liquid crystal display screen.

The invention belongs to the field of aero-engine rotor design, and provides an aero-engine two-dimensional thrust vectoring nozzle heat shield fixing and restraining structure which adopts a high-flexibility space curve notch design to actively control the rigidity of two dimensions of a bolt so as to release thermal deformation and avoid thermal damage to the structure caused by local overlarge thermal stress. And meanwhile, the material characteristics of metal rubber are used for improving the vibration absorption capacity of the aero-engine fixing and restraining structure, the problem that the vibration reduction capacity of an existing connecting structure is insufficient under airflow pulsation excitation is solved, and meanwhile the pulsation frequency band in the engine working condition is widened.

The utility model discloses a vibration absorption damping device for a gear box, which comprises a gear box base, a damping mechanism and a lubricating mechanism, the gear box base is fixedly connected with a gear box upper cover, and the gear box base is provided with a first rotating shaft, a second rotating shaft and a third rotating shaft. The damping mechanism is arranged in the gearbox base; according to the vibration absorption damping device for the gear box, vibration is detected through a sensor, current is adjusted through a PLC, the magnetic field intensity is adjusted by changing the current of a magnet exciting coil, and magnetic particles in magnetorheological fluid in gaps can be arranged in the magnetic field direction to form a chain-shaped or columnar structure through the magnetic field intensity; according to the magnetorheological fluid damping device, the viscosity of the magnetorheological fluid is increased, so that damping force is generated, vibration energy is converted into heat energy and consumed, noise generated by vibration is reduced, the working environment of workers is improved, and the noise is effectively prevented from affecting physical and psychological health of the workers.

The application discloses a vibration-absorbing and sound-absorbing device for a precision detection instrument experiment table, which is used for reducing the noise and vibration of the air path of the experiment table and comprises the following components: an air inlet assembly, a Tesla sound-absorbing assembly, two symmetrical semi-cylindrical sound-absorbing blocks, a plurality of Tesla flow channels arranged on the sound-absorbing blocks, the Tesla flow channels receiving the airflow provided by the air inlet assembly, a cylindrical sound-absorbing column formed by the two symmetrical semi-cylindrical sound-absorbing blocks, a first elastic metal sheet arranged on the joint surface of the two symmetrical semi-cylindrical sound-absorbing blocks, a cavity arranged on the outer circumference of the sound-absorbing column, and a shear thickening fluid STF filled in the cavity, a vibration-absorbing assembly and an air outlet assembly. The application has the beneficial effect that the vibration and noise of the pneumatic pipeline used in the precision detection experiment table are greatly reduced, and a low-noise and stable working environment is provided for the precision detection.

This application relates to the field of robotic vacuum cleaner technology, and in particular to a silent motor for robotic vacuum cleaners, comprising a motor body and a noise reduction component. The noise reduction component is connected to the motor body via an elastic connector and includes a vibration absorption structure and a soundproof enclosure. The inner wall of the soundproof enclosure is provided with sound-absorbing sheets and filling material, and the bottom fixing bracket ensures installation accuracy through positioning pins. This application significantly reduces noise through the synergistic effect of vibration damping pads, sound-absorbing sheets, and elastic connectors, and adopts a split soundproof enclosure for easy maintenance while optimizing heat dissipation performance. This utility model solves the problems of complex noise reduction, high cost, and insufficient heat dissipation in existing motors, providing technical support for the miniaturization design of robotic vacuum cleaners.

The utility model provides a kind of fixing structure of inner rotor magnet, the fixing structure includes motor shaft, rotor core, magnet and fixed clip, the outer surface of motor shaft is evenly distributed with multiple pressing ribs along the axial direction, multiple pressing ribs are used to with the six petal sheet center hole structure of fixed clip interference fit;Multiple installation grooves are evenly provided on the outer circumference of rotor core, multiple installation grooves are used to accommodate multiple the magnet;Fixed clip includes six petal sheet, cantilever spring piece and sawtooth;The end of six petal sheet is inclined to horizontal plane 5-10 °;Cantilever spring piece is distributed in the outer ring part of fixed clip, and cantilever spring piece is V-shaped bending structure;The sawtooth is located in the outer circle edge of fixed clip, and sawtooth contacts the magnet, so that magnet axial limit position.The fixing structure provided by the utility model has the advantages of simple structure, easy installation, vibration absorption, elastic fixing, eccentric force control, magnetic field pulsation, improved heat dissipation and the like.

The invention provides a large copper ring casting centrifugal machine which comprises a tray used for bearing a copper ring casting. The transmission shaft is fixedly connected to the bottom of the tray, the transmission shaft is arranged in the supporting frame, a bearing ring corresponding to the transmission shaft is arranged in the supporting frame, and the transmission shaft is inserted into the bearing ring and rotationally connected with the supporting frame; and the power output end of the driving assembly is connected with the transmission shaft. The invention has the beneficial effects of simple maintenance, motor protection during overload, stable operation, buffering and vibration absorption, integral hoisting of the transmission shaft during disassembly and assembly, and no need of disassembly of the shaft system, thereby facilitating reduction of the production cost, improvement of the safety and stability of equipment and improvement of the production efficiency.

The application discloses a bridge cable-stayed damping mechanism and belongs to the technical field of bridge engineering, which comprises a bottom plate installed on a bridge deck and a mounting frame installed on a cable-stayed cable, a connecting assembly is installed between the bottom plate and the mounting frame, the connecting assembly comprises a first connecting rod connected with the bottom plate through a spherical hinge and a second connecting rod connected with the mounting frame through a spherical hinge, the first connecting rod and the second connecting rod are both connected with a connecting plate through spherical hinges at one end close to each other, a damping device is arranged at the spherical hinge connecting position, the two connecting plates are connected through a first spring, and a buffer fixing seat is elastically connected to the two sides of the mounting frame and is installed on the cable-stayed cable. When the cable-stayed cable vibrates, the mounting frame is driven to move, the first connecting rod and the second connecting rod are rotated through the spherical hinge connecting position, the first spring between the two connecting plates is deformed to realize buffering, and the damping device of the spherical hinge connecting position absorbs vibration, so that when the cable-stayed cable vibrates in any direction, the connecting assembly can realize buffering and vibration absorption.

The invention relates to the technical field of electric energy storage systems, and provides a wind power system cooperative operation method adopting a supercritical airfoil blade structure, which is used for solving the problem that the wind power acceptance capability of a power grid is influenced by blade vibration, and comprises the supercritical airfoil blade structure and a layered cooperative control system; the supercritical airfoil blade structure comprises a blade body composed of a blade root part, a blade body part and a blade tip part, a noise reduction piece is fixedly arranged on the rear edge of the blade body, a splicing groove is formed in the noise reduction piece, the rear edge of the noise reduction piece is in a continuous curve shape or a continuous broken line shape, and a groove is formed in the surface of the noise reduction piece. A melamine foam vibration absorption layer is arranged at the rear edge of the blade body in a clamped mode, and a vibration absorption groove is formed in the bottom of the splicing groove. A V-shaped opening for reducing the wind resistance area is formed in the blade tip part of the blade body; the layered cooperative control system comprises a dynamic power distribution module and an angular frequency error feedback synchronous control module.

The present invention discloses a multi-directional tunable dynamic vibration absorption device for a pipeline and a design method. The vibration absorption device includes a pair of semi-circular vibration absorption shells that can be symmetrically engaged with the outer wall of the pipeline. The vibration absorption shells include an inner circular arc plate, an outer circular arc plate and a plurality of ribs. The plurality of ribs are arranged between the inner circular arc plate and the outer circular arc plate along the radial direction of the vibration absorption shell. A vibration absorption chamber for installing a vibration absorption component is formed between two adjacent ribs. The vibration absorption component includes a mass block and an elastic member. The mass block can rotate along the circumference of the vibration absorption shell. The elastic member is arranged between the mass block and the ribs along the circumference of the vibration absorption shell. The vibration absorption method fixes the vibration absorption device on the pipeline for vibration absorption.

The invention discloses a vibration suppression system and method for an aero-engine case, and relates to the technical field of aero-vibration suppression, the vibration suppression system comprises a self-coordination control device, a driving device, an acquisition module and a control module; the main vibration frequency of the structure to be subjected to noise reduction is collected through the collection module and fed back to the control module, the control module sends an instruction to the driving device, the driving device drives the adjusting wheel to rotate, the elongation of the cantilever beam is changed, and the free frequency of the self-coordination control device is adjusted to be consistent with the main vibration frequency of the structure to be subjected to noise reduction. Therefore, the purposes of vibration absorption and noise reduction are achieved. The vibration suppression system is simple in structure, has the function of dynamically adjusting the vibration absorption range, can achieve the purpose of wide-range vibration absorption and noise reduction with small mass load, and is particularly suitable for vibration suppression with limited space, controlled load and variable vibration excitation.

This invention discloses a tuned mass damper, relating to the field of tuned mass damper technology. The tuned mass damper includes a housing, two mass modules, and a cosine beam. The two mass modules are disposed within the housing and are spaced vertically. Each mass module includes a vibration-absorbing component and multiple elastic elements disposed around its periphery. The multiple elastic elements extend laterally along the vibration-absorbing component, with one end connected to the vibration-absorbing component and the other end connected to the housing. The cosine beam is disposed between the two vibration-absorbing components, with its upper end connected to the upper vibration-absorbing component and its lower end connected to the lower vibration-absorbing component. This application achieves a wider effective vibration suppression frequency band by using two vibration-absorbing components (upper and lower) in conjunction with the cosine beam to absorb vibration. By arranging multiple elastic elements around the vibration-absorbing components, compared to tuned mass dampers that absorb vibration in a single dimension, it achieves vibration absorption in multiple dimensions, and the structure is simple and easy to replace.

The invention discloses a frequency-adjustable dynamic vibration absorber, and belongs to the technical field of dynamic vibration absorbers, the frequency-adjustable dynamic vibration absorber comprises a fixed support assembly, a plate spring, a mass block, a driving assembly and a sliding clamp, and the fixed support assembly is provided with a plate spring mounting part and a driving assembly mounting part; the middle part of the plate spring is mounted on the plate spring mounting part, and two ends of the plate spring are free ends which are respectively provided with a group of mass blocks; the driving assembly is mounted on the driving assembly mounting part; the area between the middle and the free end of the plate spring is the movement area of the sliding clamps, the two sides of the plate spring are each provided with one movement area, one sliding clamp is arranged in each movement area, the sliding clamps are in sliding connection with the plate spring, and the sliding clamps are in transmission connection with the driving assembly. The vibration absorber is driven by the driving assembly to linearly move in the length direction of the plate spring, the effective working length of the plate spring is changed, the inherent frequency of the plate spring is adjusted, the inherent frequency of the vibration absorber is synchronously matched with the external excitation frequency, and the optimal vibration absorption effect is achieved.

The invention discloses a self-adaptive bistable nonlinear energy trap vibration absorption device, belongs to the field of vibration control, and can be used for vibration suppression in the fields of aerospace, precision manufacturing and the like. The device comprises a bistable adjusting device, an electromagnetic damping adjusting device, a hinge connecting rod guiding device, a multi-fulcrum movable frame, a mover mass block and the like. The bistable state is realized by connecting negative stiffness formed by a pre-compression horizontal spring and a hinge connecting rod with a vertical weak positive stiffness spring in parallel, and a motor regulates and controls the pre-compression amount of the horizontal spring through a belt and a worm and gear so as to change the potential well depth; the electromagnetic damper is a Lorentz actuator, a coil is connected with a movable frame, and a permanent magnet is connected with a structural bottom plate; the two acceleration sensors respectively measure the vibration of the movable frame and the structure. The device can adaptively adjust bistable state and damping, achieves optimal target energy transfer, and has the advantages of high robustness, strong broadband line spectrum control and high efficiency.

This invention provides a bundling unit (10) for bundling stored objects (80A) in a box-type container (200) in a manner that is divided into two columns spaced apart in the width direction and two layers in the vertical direction. The bundling unit includes: a lower buffer (1) supporting the two columns of stored objects (80A) in the lower layer; a middle buffer (3) clamping one between each of the upper and lower stored objects; an upper buffer (5) holding the upper part of the stored objects; and a vibration absorption unit (20) provided with... At the bottom of the container, the vibration absorption unit (20) has a first plate (21), a second plate (22), and an elastic body (23) disposed between the first plate (21) and the second plate (22). The center of the elastic body (23) is located further outward than the center of gravity of the stored objects relative to the middle of the two rows of stored objects. The distance (D) in the width direction between the center of the elastic body (23) and the center of gravity of the stored objects is more than 2% and less than 8% of the maximum outer diameter of the elastic body (23).

The present application relates to a kind of tuned mass damper and track structure;The device includes shell and mass, the mass is located in the shell, the mass and the shell are formed with cavity between, the mass and the shell are connected by annular elastic layer, the annular elastic layer separates the first chamber and the second chamber in the cavity, the first chamber and the second chamber are filled with damping fluid in it.The mass of the present application is connected in the shell by annular elastic layer, when working, elastic layer occurs shear deformation, with single natural frequency, reliable tuned vibration absorption is realized, low-frequency vibration influence is reduced, the device is maintenance-free, and operating and maintenance cost is low;Shell can provide good strength, built-in concrete structure will not reduce the strength of concrete structure, and the range of use is wide.

The application relates to a series double-stage shock absorber for oil drilling, which comprises a shell, a fluid damping module, an inertial vibration absorption module, a pressure compensator system and a heat dissipation and sealing system arranged in the shell, the fluid damping module and the inertial vibration absorption module are axially connected in series to form a series double-stage shock absorbing structure, the fluid damping module is arranged in a fluid damping chamber at the lower part of the shell, the inertial vibration absorption module is arranged in an inertial vibration absorption chamber at the upper part of the shell, and the pressure compensator system is arranged between the fluid damping module and the inertial vibration absorption module; the fluid damping module comprises rectangular damping discs, a transition flow channel and damping liquid, the rectangular damping discs are uniformly arranged outside the transition flow channel, and the rectangular damping discs are provided with damping holes and damping rib plates; heat dissipation fins are uniformly arranged at the lower part of the shell. The series double-stage shock absorbing structure is adopted, large energy low-frequency impact is consumed through the fluid damping chamber, high-frequency vibration is filtered through the inertial vibration absorption chamber, and wide-band and high-efficiency multidimensional vibration suppression is realized.

The application relates to an assembled isotropic frequency steel rail damping vibration absorber, which comprises a shell installed on the rail waist on both sides of the steel rail, cooperates with the surface shape of the rail waist, is flush with the rail bottom on the outer side, and defines an installation space in the shell, both ends of the installation space are open, and end covers are detachably connected to the end portions of the two ends; the elastic bodies are cylindrical, the axes of the elastic bodies are arranged in parallel with the length direction of the steel rail, there are two elastic bodies, one end of each elastic body is detachably connected to the inner side wall of the end cover; a mass block is installed in the installation space and is detachably connected with the other end of the two elastic bodies in a one-to-one correspondence; and the gap reserved between the mass block and the shell is greater than or equal to 5 mm. The application utilizes the rubber cutting performance to reduce the rigidity of the steel rail vibration absorber product, adopts the assembled replaceable components, quickly adjusts the resonance frequency, reduces material waste, has better vibration absorption performance, has a wider application range, and prolongs the service life of the elastic body and the mass block which are located in the shell.

The application relates to an electric power tool, which is powered by a power supply assembly, and specifically comprises: a motor driven by the power supply assembly; a shell used for accommodating the motor; and a power supply connecting part provided with a terminal connected to the power supply assembly and capable of transmitting the energy in the power supply assembly to the motor; the shell is provided with a first supporting part, the power supply connecting part is provided with a second supporting part, and a vibration absorbing piece is arranged between the first supporting part and the second supporting part. Therefore, the vibration on the shell is reduced to be transmitted to the battery connecting part, and the probability of poor contact of the terminal is reduced.

A pickleball paddle with improved vibration mitigation is described. An example pickleball paddle comprises a handle comprising one or more first structural materials, a striking blade comprising one or more second structural materials, and a transition section continuous with and located between the striking blade and the handle to form the pickleball paddle. The transition section comprises a throat that is covered by a structural material that connects the handle to the striking blade and comprises vibration absorbing component. In another example pickleball paddle, the transition section, formed with one or more vibration dampening materials, indirectly connects the striking blade to the handle. A cross-section of at least a part of the transition section in the vertical direction is devoid of the handle and the striking blade.