178 results about "Dynamic Vibration Absorber" patented technology

The present invention discloses a double-annular strong magnetic array nonlinear dynamic vibration absorber and design method for suspension vibration reduction, which belongs to the field of structural vibration control. The installation position and quantity are designed according to the vibration reduction requirements, and one is usually installed at the midpoint of the suspension. The vibration absorber comprises inner and outer magnetic ring arrays, counterweights, universal wheels and a base. It feeds back the control force in the opposite direction of the suspension vibration during movement, so that the suspension vibration energy is transferred to the vibration absorber and then less returned to the suspension, and the energy is dissipated through friction between the universal wheel and the base, the installation of air dampers and other measures. It introduces nonlinear stiffness, so that the optimal parameter domain range is expanded from the line domain to the surface domain, and thus has the outstanding advantages of easy parameter tuning and high vibration reduction robustness, and is easy to install, durable, and requires no or less maintenance. It is applicable to single, double and four-cable suspensions, and is expected to achieve the goal of good vibration reduction effect throughout the life cycle of the suspension, which has positive significance for ensuring driving and bridge safety and extending the service life of the suspension.

The invention relates to the field of machinery, in particular to a three-way composite vibrator dynamic vibration absorber and a vibration absorbing method. The three-way composite vibrator dynamic vibration absorber comprises an elastic support, the elastic support comprises an elastic support base, and the elastic support base is provided with a fixing hole. The elastic support base is further connected with four free ends, and free end foundation plates are arranged at the four free ends. Mounting holes are formed in the free end foundation plate; the nonlinear oscillator A, the nonlinear oscillator B and the linear oscillator C are combined together to form a special composite oscillator; the vibration absorber has the beneficial effects that dynamic vibration absorption and vibration and noise reduction can be realized in three mutually orthogonal directions, the vibration absorber can normally work in weightlessness, severe and complex environments, can simultaneously adapt to external excitation with different intensities and multiple angles, has a relatively wide matching frequency, can effectively absorb vibration energy of a power device or a mechanical structure, and has a good application prospect. And vibration and noise generated thereby are suppressed.

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%.

The invention discloses a pipeline vibration reduction method for a photoetching machine, and belongs to the field of photoetching machines. Aiming at the problems of poor pipeline vibration reduction effect and high cost in the existing photoetching machine, the invention provides the pipeline vibration reduction method for the photoetching machine, which comprises the following steps: determining a first vibration area which is an area with the vibration amplitude exceeding a first threshold value in a pipeline; determining the vibration amplitude and the vibration frequency of the first vibration area, and setting the first vibration area as a high-amplitude vibration area when the vibration amplitude exceeds a second threshold value; a dynamic vibration absorber is arranged in at least one high-amplitude vibration area; the inherent frequency of the dynamic vibration absorber is matched with the vibration frequency of the corresponding high-amplitude vibration area. According to the method, the first vibration area is selected through preliminary screening, and then the accurate and reliable high-amplitude vibration area is obtained through fine measurement of the first vibration area, so that the mounting position of the dynamic vibration absorber is determined; the dynamic vibration absorber is simple and convenient to operate, the optimal vibration reduction effect of the dynamic vibration absorber can be ensured, and waste of resources can be avoided to a certain extent.

The invention discloses an integrated rigidity damping inerter self-control type two-stage vibration reduction hydro-pneumatic suspension and a working method in the field of automobiles, a hollow plunger extends into an upper cavity of an oil cylinder, the lower end of the hollow plunger is fixedly connected with a piston, and an upper lifting lug runner is sequentially connected with an inerter pipe, an electric control throttle valve and a large hydro-pneumatic chamber through a first hydraulic oil pipe; a lower lifting lug runner is sequentially connected with a damper and a small oil gas chamber through a second hydraulic oil pipe, a built-in rigidity control valve outer cylinder with the lower end fixedly connected with a piston is arranged in the plunger, an inner cylinder with the upper end sealed and the lower end connected with the lower lifting lug through a spherical hinge is coaxially sleeved with the outer cylinder, and three rows of holes are formed in the side wall of the inner cylinder from bottom to top. Two rows of holes are formed in the side wall of the outer cylinder from bottom to top; the flow direction of oil liquid is changed when the suspension works, a seal does not need to be arranged on a piston, a longer oil through hole is formed in an outer barrel, the safety of the control valve is improved, a wheel dynamic vibration absorber is integrated to an oil cylinder, integration is achieved, an external rigidity control valve is replaced with an internal rigidity control valve, and the size of the whole suspension is reduced.

The invention relates to the technical field of structural vibration control, in particular to an adjustable electric damping-negative stiffness dynamic vibration absorber for a flexible shafting. According to the technical scheme, the damping device comprises a support and a rolling bearing, a plurality of first supporting rods used for supporting are arranged outside the rolling bearing, an electric damper used for absorbing vibration is arranged at one end of each first supporting rod, and a second supporting rod used for supporting is arranged on the other side, away from the first supporting rods, of each electric damper. A negative stiffness vibration absorber is arranged at the end, away from the electric damper, of the second supporting rod, and the electric damper comprises an auxiliary circular ring used for bearing loads. Through the arrangement of the adjusting plate, the adjusting bolt, the disc spring, the mass block, the movable magnet, the static magnet and the electric damper, the purposes of vibration absorption and vibration reduction can be achieved at the transcritical rotating speed and the supercritical working rotating speed, and the negative stiffness dynamic vibration absorption frequency and the electric damping suppression modal frequency can be rapidly adjusted according to the change of the operation working condition; and the application range and the universality are improved.

The present invention discloses a suspension structure and parameter design method for suppressing high-frequency vibration of a vehicle body by three measures in the automotive field. An existing stiffness-damping inertia autonomous controllable suspension and a wheel high-frequency dynamic vibration absorber are combined to form a suspension for suppressing high-frequency vibration of a vehicle body by three measures. On the basis of vehicle body mass, wheel mass and equivalent stiffness, the mass of the wheel high-frequency dynamic vibration absorber and the minimum stiffness of the suspension in comfort mode are determined according to automobile design requirements. The damping and inertia of the inertia tube, the stiffness and damping of the wheel high-frequency dynamic vibration absorber are optimized with the goal of minimizing the objective function. When the vehicle is traveling on a bad road, the high-frequency vibration suppression measure transmitted from the wheel to the vehicle body is expanded to three measures of wheel high-frequency dynamic vibration absorption, vibration isolation and anti-resonance vibration reduction that work in coordination with each other, so that the advantage of the wheel high-frequency dynamic vibration absorption measure in cutting the peak of the high-frequency vibration of the vehicle body and the advantage of the anti-resonance vibration reduction measure in narrowing the bandwidth of the high-frequency vibration frequency band of the vehicle body are organically combined, and the vibration of the vehicle body in the high-frequency vibration band is completely flattened.

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.

The utility model relates to the technical field of vibration reduction, in particular to a dynamic vibration absorber which comprises a fixing assembly which can be fixedly arranged on a pipeline in a sleeving mode. The elastic damping assemblies are arranged on the outer side of the fixing assembly at intervals in the circumferential direction of the fixing assembly, and the elastic damping assemblies are detachably connected with the fixing assembly; and the counterweight assembly is arranged on the fixing assembly in a sleeving manner, and the counterweight assembly is detachably connected with the elastic damping assembly. The vibration of the pipeline can be reduced, so that the noise is reduced, and the influence on the working state of personnel is reduced.

The utility model discloses a dynamic vibration absorber with a soft limiting function. The dynamic vibration absorber comprises a mass block, a shell, a rubber part and a bandage. The two ends of the mass block are fixed to the shell through arranged rubber parts, and the mass block and the shell are fixed through additionally-arranged bandages. The dynamic vibration absorber with the soft limiting function is simple in structure, reasonable in design and convenient to assemble.

The invention discloses a ship pipeline particle damping vibration absorption system and method based on dynamic adjustment. The system comprises a pipeline clamp component and a dynamic vibration absorber. The dynamic vibration absorber comprises a main spring component connected with the pipeline clamp component, a particle damping assembly module connected with the main spring component and a mass balance weight module. The main spring component comprises a center spring and a spring rigidity adjusting module. The particle damping assembly module comprises a fan-shaped metal frame and a plurality of particle damping vibration attenuation units arranged on the fan-shaped metal frame; vibration energy is dissipated through collision and friction of metal particles in the particle damping vibration attenuation unit, the particle diameter and the filling rate are flexibly adjusted according to actual working conditions, and the vibration absorption frequency range is widened. The mass balance weight module comprises a plurality of detachable balance weight pieces which are arranged in a stacked mode. The vibration suppression device is compact in structure and can flexibly adapt to various working conditions, and efficient suppression of vibration at the characteristic frequency position of the pipeline is achieved by dynamically adjusting the spring rigidity, the particle damping parameters and the mass balance weight.

To suppress horizontal vibration of a nuclear pressure vessel during an earthquake, and make a dynamic vibration absorber compact to suppress an installation space of the dynamic vibration absorber, in a nuclear power plant.SOLUTION: An earthquake resistance support device for a nuclear power plant is arranged in a reactor containment vessel, and suppresses horizontal vibration of a reactor pressure vessel supported by a pedestal when an earthquake occurs. The earthquake resistance support device comprises a horizontal beam that is arranged between the reactor containment vessel and the reactor pressure vessel, and the pedestal, and extends in the radial direction of the reactor pressure vessel and the pedestal; and a dynamic vibration absorber installed on the horizontal beam. The dynamic vibration absorber comprises a hollow weight extrapolated to the horizontal beam and movable in an axial direction of the horizontal beam, and a coil spring device that elastically supports the hollow weight in the axial direction of the horizontal beam, to allow the hollow weight to vibrate in the axial direction of the horizontal beam.SELECTED DRAWING: Figure 3

The invention discloses a frequency-adjustable dynamic vibration absorber adjusted by using a stepping motor and a vibration absorption method, main vibration absorption objects of a vibration absorption mechanism are a fan shell and a fan inlet and outlet pipeline, the vibration absorber adopts a mass block as a vibration absorption vibrator of the dynamic vibration absorber, the vibrator is mounted on two cylindrical guide rails, and the cylindrical guide rails are arranged on the vibration absorption vibrator. The two ends of the vibration absorber are restrained through a spring connected with the vibration absorber main frame, the vibration absorber is provided with a spring check ring capable of moving in the axial direction of the spring to limit displacement of the middle section of the spring, the spring check ring and the vibration absorption vibrator are installed on the same guide rail, and the position of the spring check ring can be adjusted through a lead screw driven by a stepping motor. The effective length of the spring is changed, so that the characteristic frequency of the dynamic vibration absorber is changed, and the purpose of broadband vibration reduction is achieved. The vibration absorber is simple and compact in structure, easy to adjust, low in energy consumption, good in vibration reduction effect, high in structural modularization degree and good in use prospect.

The invention relates to a high-reliability refrigerating machine micro-vibration suppression system for space. The high-reliability refrigerating machine micro-vibration suppression system comprises a detector, a cold plate, a flexible cold chain, a supporting column, a refrigerating machine cold finger, a cabin plate, a mounting base plate, a coupling flange, a cold head, a connecting pipe, a dynamic vibration absorber, a compressor, a cold box, a vacuum cavity, an outer corrugated pipe, a vacuum pump suction pipe and a vacuum pump. According to the high-reliability refrigerating machine micro-vibration suppression system for the space, the dynamic vibration absorber is adopted for absorbing vibration of the cold head of the refrigerating machine while effective supporting of the transmitting section and micro-vibration isolation in the on-orbit period are achieved, micro-vibration of the refrigerating machine is further suppressed and isolated, and the refrigerating efficiency is improved. The device has the advantages of high reliability, simple structure, low cost and thorough micro-vibration suppression; vibration isolation is achieved through the environment difference between the space and the ground, operation is not needed after in-orbit operation, automatic unlocking is achieved, and surrounding structures and loads are friendly and free of damage.

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 invention provides a multi-dynamic vibration absorber robust optimization design method and system, and relates to the technical field of dynamic vibration absorbers, the design method is based on a scene theory, and comprises the following steps: S1, establishing a mechanical model of a deterministic multi-dynamic vibration absorber; s2, determining a probability distribution form and a sampling range of each uncertain parameter variable, abstracting a robustness optimization design problem of the uncertain multi-dynamic vibration absorber into a minimum-maximum optimization problem, and establishing a mathematical model of the minimum-maximum optimization problem; s3, converting an infinite constraint optimization problem into a finite constraint optimization problem by utilizing a scene theory, and establishing an uncertainty multi-dynamic vibration absorber robustness optimization model based on the scene theory; and S4, solving the uncertainty multi-dynamic vibration absorber robustness optimization model based on the scene theory by using a self-adaptive constraint processing double-population evolutionary algorithm as an optimization algorithm, and searching optimal design parameters of the dynamic vibration absorber. According to the invention, the reliability of the design of the multi-dynamic vibration absorber can be improved.

To provide a dynamic vibration absorber capable of preventing a deterioration of a vibration control performance.SOLUTION: A dynamic vibration absorber reduces a vibration of an object, and includes a mass body and an elastic member arranged between the object and the mass body. The mass body includes: a container fixed to the elastic member; a porous body having a plurality of pores and arranged inside the container; and a liquid supplied to the porous body.SELECTED DRAWING: Figure 2

To provide a dynamic vibration absorber capable of appropriately attenuating the vibration of an object. 【Solution means】The dynamic vibration absorber has a curved surface that is curved in a concave shape and has at least one groove formed in the bending direction, and moves in accordance with the vibration of the object. The dynamic vibration absorber includes a moving part that rolls or slides on the curved surface, and a mass body that moves in the bending direction by the rolling or sliding of the moving part.

The utility model discloses an automobile vibration reduction magnetic ring device which comprises a vibration reduction magnetic ring device, an iron core ring and a magnetic core ring. An annular groove B is formed in one side of the interior of the vibration reduction magnetic ring device in a penetrating mode, an annular inserting groove A is formed in the other side of the interior of the vibration reduction magnetic ring device in a penetrating mode, a magnetic core ring is inserted into the annular inserting groove A, and an iron core ring is inserted into the annular inserting groove B. The surface of the magnetic core ring is sleeved with a rubber material to form a demagnetizing ring; and the surface of the iron core ring is sleeved with a rubber material to form the shock absorber. A novel structure and function design are used, the functions of a traditional dynamic vibration absorber and a degaussing ring are integrated, the vibration absorption function is achieved, the filtering function of the degaussing ring can be achieved, differentiated innovative products can be provided through the double-mass-block structural design, the wider suppression frequency band or the double-frequency suppression function can be obtained, and the application range is wide. Therefore, a traditional passive dynamic vibration absorber product is replaced.

The application discloses a kind of floating plate low height power vibration absorber, including mass, mass both ends are symmetrically arranged first support, first support is mutually perpendicular fixed part and support part, the support part and mass both ends are fixedly connected rubber layer, the bottom surface of mass distance fixed part bottom surface has interval S.The power vibration absorber presented in the application, mass, support and rubber layer are sequentially laminated connection, so that the height of whole power vibration absorber is reduced, and the driving of vehicle is not affected.The thickness of mass can be controlled, and the frequency range of power vibration absorber is adjusted.

Provided is a dynamic vibration absorber that includes a first support part, a second support part separated from the first support part by a first gap, and at least a first vibration absorber module, the first vibration absorber module includes a first surface of the first support part, a first surface of the second support part, and a first vibration absorber cylinder connecting the first surface of the first support part and the first surface of the second support part, the first vibration absorber cylinder includes a first cylindrical portion and at least a first movable mass, the first movable mass being connected to the first cylindrical portion to vibrate at a predetermined frequency.

The invention discloses a heat distribution pipeline vibration response analysis and vibration reduction control method along with bridge laying, and the method comprises the following steps: S1, building a pipeline vibration analysis model containing fluid flow, external excitation and a thermal expansion effect based on an energy finite element method, and calculating the energy density distribution and energy flow distribution of a pipeline; s2, on the basis of the energy density distribution and the energy flow distribution, identifying damaged and weak parts of the pipeline through predefined damage indexes; s3, designing at least one magnetic damping dynamic vibration absorber based on a fixed-point theory, and determining the mounting position of the magnetic damping dynamic vibration absorber along the pipeline through a multi-objective optimization algorithm; s4, performing thermal stress coupling analysis on the pipeline system added with the magnetic damping dynamic vibration absorber; and S5, the vibration reduction effect is verified through finite element simulation and field tests. Through the pipeline vibration analysis model established based on the energy finite element method, the energy density and the energy flow distribution of the pipeline in the axial direction are accurately calculated, and the propagation path and the concentration area of vibration energy are revealed.

The invention discloses a gradient embedded acoustic black hole and dynamic vibration absorber composite vibration isolator design method based on a reduced multi-body system transfer matrix method. Based on an acoustic black hole principle and a dynamic vibration absorber working principle, a composite structure comprising a plurality of gradient embedded acoustic black holes and a dynamic vibration absorber is designed. Compared with a gradient embedded acoustic black hole structure with the same geometric size and material, the gradient embedded acoustic black hole and dynamic vibration absorber composite structure has better low-frequency broadband vibration isolation performance.

A dynamic vibration absorber includes a frame configured for mounting to a moveable structure; a flywheel mounted on a first shaft; and a first converter adapted to convert a linear displacement of the frame into rotation of the first shaft; including a rotary damper mounted on a second shaft; and a second converter adapted to convert a rotational velocity of the first shaft into a rotational velocity of the second shaft.

The utility model discloses a novel air conditioner compressor dynamic vibration absorber, and belongs to the technical field of automobile parts, the novel air conditioner compressor dynamic vibration absorber comprises a mass block, a rubber part and a support used for being connected to a frame, the support comprises a long-strip-shaped bottom plate, the two sides of the bottom plate are bent to form a connecting disc, the connecting disc is provided with a mounting hole, and the mounting hole is communicated with the rubber part. Supporting legs bent towards the mass block are arranged on the periphery of the connecting disc, the mass block is located in the middle of the support, the two ends of the mass block are installed on the connecting disc through rubber parts, the rubber parts partially penetrate through installation holes in the connecting disc, and the supporting legs are arranged on the periphery of the rubber parts and are spaced from the outer surfaces of the rubber parts. The structural arrangement of the vibration absorber is further optimized, large-amplitude vibration of the mass block is limited, the service life of the dynamic vibration absorber is prolonged, and the mass block is prevented from being disengaged to cause functional loss.

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 frequency-adjustable type double-order dynamic vibration absorber, and relates to the field of vibration control, the frequency-adjustable type double-order dynamic vibration absorber comprises a supporting base, a plate spring used for absorbing vibration force is arranged at the top of the supporting base, the plate spring comprises at least three supporting layers and elastic layers located between the adjacent supporting layers, and the supporting layers and the elastic layers are fixed through vulcanization bonding; mass blocks are arranged at the tops of the two ends of the plate spring, absorption seats are arranged at the bottoms of the two ends of the plate spring and located at the mass blocks, and the mass blocks longitudinally move at the tops of the absorption seats; the adjusting structure comprises a body cover plate arranged at the top of the plate spring relative to the supporting base, limiting beams used for limiting movement of the mass block are arranged on the two sides of the body cover plate, adjusting clamping plates are movably arranged in the middles of the limiting beams, and the adjusting clamping plates drive the mass block to transversely move and adjust the vibration frequency of the plate spring. Movement of the mass block is flexibly adjusted to enable vibration frequencies to be matched, and meanwhile double vibration absorption is suitable for medium-frequency and high-frequency vibration absorption work.

The utility model relates to a multifunctional hybrid dynamic vibration absorption device which comprises a spring mass system, a magnetic force adjusting system and a passive dynamic vibration absorber part, and the passive dynamic vibration absorber part is of a cantilever beam structure. A spring mass system and a magnetic force adjusting system are installed on the cantilever beam structure. An adjusting mass block can be additionally arranged on the basic mass block, so that mass adjustment is realized. The elastic rod is of a cantilever beam structure, the position of the main mass can be adjusted through the adjusting screw, and therefore fine adjustment of rigidity is achieved. According to the utility model, an independent magnetic force adjusting system composed of the magnetic circuit mass block, the driving winding and the permanent magnet is provided, after the system is electrified, electromagnetic force can be generated in the vibration direction, and active control can be realized by matching with a sensor and a control system.

The invention discloses an assembly type dynamic vibration absorber wrapped with a pre-positioned vulcanized metal plate, which comprises a bracket, connecting lugs are integrally formed at the two ends of the bracket, and connecting holes are formed in the inner sides of the connecting lugs; the mass block is arranged on one side wall of the connecting lug; the rubber block is arranged on the other side wall of the connecting lug, and a pin connected with the mass block is arranged on the inner side of the rubber block; the metal plate is arranged on the inner side of the rubber block, and positioning holes corresponding to the pins are formed in the inner side of the metal plate in a penetrating mode; through the arrangement of the support, the mass block, the metal plate, the rubber block and the pin, the situation that the framework needs to be coated with an adhesive, and the physical and psychological health of an operator is affected is avoided, the metal plate is designed at the bottom of the rubber block, the metal plate and the rubber block are vulcanized, the rigidity of the bottom is improved, and the positioning grooves are designed in the two end faces of the mass block. And the positioning groove and the rubber block can be well pre-positioned to keep coaxial, so that the risk of eccentricity is reduced.

The invention relates to a dynamic vibration absorber based on acoustic black hole and particle damping coupling, which comprises an acoustic black hole structure and a cavity shell, the acoustic black hole structure comprises a thickness gradual change area and a uniform thickness area, and the thickness of the thickness gradual change area is gradually reduced from the maximum thickness end to the minimum thickness end; the minimum thickness end of the uniform thickness area and the minimum thickness end of the thickness gradual change area are connected into a whole, and a damping covering layer is arranged at the joint of the thickness gradual change area and the uniform thickness area. The cavity shell covers the acoustic black hole structure, a cavity is formed in the cavity shell, partition plates are arranged in the cavity at intervals, the adjacent partition plates divide the cavity into sub-cavities which are not communicated with one another, the sub-cavities are filled with free particles, and the height of the partition plates in the cavity is matched with the outer contour of the acoustic black hole structure in a coordinated mode. The gap between the top of each partition plate and the acoustic black hole structure is smaller than the diameter of a free particle. By means of the synergistic effect of acoustic black hole energy gathering and particle damping energy dissipation, the overall vibration reduction efficiency is improved, and the effective frequency band is widened.