196 results about "Tuned mass damper" patented technology

The invention belongs to the technical field of low-frequency vibration control, and provides a low-frequency tuned mass damping device for reversely stretching a compression spring in order to solve the problem that a traditional tuned mass damper is limited in use of a vertical space due to too large net deformation of the spring under the low-frequency condition. According to the device, large compression deformation and reverse tensile deformation of the spring are fully realized in a limited vertical space in a manner of performing super-compression-reverse tensile treatment on the compression spring, relatively low rigidity required by a vibration system is achieved, low-frequency tuning can be realized in the limited vertical space of a bridge girder, and the rigidity of the vibration system is improved. The frequency application range of the tuned mass device is greatly expanded; and meanwhile, the problems that the stability problem is caused when a traditional compression spring mass body is arranged on the spring and the damping is too high and unstable due to the fact that a guide component is added are solved. The device is simple in structure, low in damping, low in space requirement and good in stability, and can be applied to vertical, lateral and torsional multi-type low-frequency vibration control of various engineering structures.

The invention discloses a tuned mass vibration damper with controllable damping, and relates to the field of vibration control of offshore wind power generation equipment structures. The mass damping unit is arranged in a suspended mode, the clamping ring is coaxially arranged, the electromagnetic damping units are evenly distributed in the circumferential direction of the clamping ring, and the electromagnetic damping units are connected with the mass damping unit through winding ropes which are arranged in a radial mode to form a multidirectional synergistic composite damping system; the mass damping unit generates reverse inertia force in vibration to restrain movement of the tower and drives the electromagnetic damping unit to act at the same time, the generator is driven to generate electromagnetic damping through the one-way bearing and the speed increaser, and lossless reset is achieved through the torsion ring. The device is integrated with an energy recovery unit, vibration energy is converted into electric energy to be stored, real-time regulation and control of damping force, omni-directional vibration response and energy feedback are achieved, and the vibration reduction efficiency and the energy utilization rate are remarkably improved.

The invention relates to the technical field of floating fans, in particular to a parameter tuning method suitable for a multi-tuned mass damper of a floating fan, which sequentially comprises the following steps of: establishing a system dynamics model; defining an optimization variable and a constraint range; constructing a comprehensive fitness function; initializing a grey wolf population and algorithm parameters; executing a grey wolf position optimization updating mechanism; setting convergence judgment conditions; and outputting the optimal TMD parameter combination. According to the method, structural dynamic characteristics and an intelligent algorithm strategy are fully fused, particularly, spatial arrangement coordinates of the TMD are brought into an optimization variable domain, collaborative design of tuning parameters and arrangement space is achieved, the method is different from a single-parameter or fixed-point optimization mode, the limitation of artificial experience layout is avoided, overall suppression of structural multi-order modal response is achieved, and the method is suitable for large-scale popularization and application. The damping capacity and the stability margin of the fan structure under wind wave flow coupling excitation are improved, cross-modal and multi-source vibration cooperative treatment is achieved on the system response coordination and control strategy level, and the method has the adaptability to offshore wind power scenes.

The invention relates to the technical field of bridge vibration reduction, in particular to a double-spring frequency conversion lever tuned mass damper device and a regulation and control method. The double-spring frequency conversion lever tuned mass damper device comprises a base, a lever, a mass block, a first spring and a second spring. Wherein the base is used for being connected with a to-be-damped structure; the middle of the lever is rotationally connected with the base; the mass block is arranged on the lever and located on one side of the base. The first spring and the second spring are located on the two sides of the base respectively, connected with the lever or abut against the lever and used for balancing the gravity of the mass block, and the first spring is located between the mass block and the base. The problems that in the prior art, when the spring end stress and the mass block end stress are amplified in a lever proportion, the pin shaft stress is too large, damping is too large, debugging is difficult, the pin shaft and a lever need to be thickened or made of special alloy, the manufacturing cost is increased, and potential safety hazards are possibly caused by material fatigue are solved.

To set specifications while suppressing antiresonance in a vibration control device having a plurality of tuned mass dampers.SOLUTION: A method for setting specifications of a vibration control device 10 having a plurality of tuned mass dampers 14 includes a step of assuming that the plurality of tuned mass dampers 14 are sequentially installed on a structural material 52, setting a natural frequency of the tuned mass damper 14 assumed to be first installed to a primary natural frequency of the structural material 52, and then obtaining a frequency of antiresonance generated by one or a plurality of tuned mass dampers 14 assumed to be previously installed; Is repeated.SELECTED DRAWING: Figure 6

The invention belongs to the technical field of vibration control, and discloses a tuned mass damping device for controlling low-frequency vertical bending vortex vibration of a large-span bridge, which consists of a fixed pulley, a mass block, a high-strength light force transmission cable, a spring, a hanging ring and a damper. Fixed pulleys and mass blocks are arranged at the positive and negative maximum displacement positions of a longitudinal bridge direction mode of a main beam respectively, a suspension system is formed by a full-length force transmission cable, and the gravity of the two mass blocks is basically balanced; the mass block is connected through the spring and is close to the bridge vibration control target frequency. When the bridge vibrates, the two mass blocks generate inertia forces which are opposite in direction but overlapped with each other, the driving system and the bridge form resonance, and therefore bridge vibration is effectively restrained. The gravity of the mass block can be self-balanced, the strength and the number of the springs are greatly reduced compared with those of a traditional TMD, any low-frequency tuning can be conducted in a vertical limited space, and the engineering cost is remarkably reduced. The device can be used for controlling vertical bending and torsional vibration of various engineering structures; the damper is replaced by an actuator, so that active control can be realized or the damper can be used as a structural excitation device.

The embodiment of the invention discloses a vibration control method and system for a steel-concrete combined box girder bridge, and the method comprises the steps: carrying out the vehicle-bridge coupling vibration analysis through building a space finite element model which accurately considers the interface slippage and shear hysteresis effect; an initial optimal parameter group of the multi-tuned mass damper is optimized and determined based on an analysis result, and installation tuning is carried out; in the operation stage of the bridge, vibration is monitored in real time through the sensor system, parameters of the damper are dynamically adjusted by the controller according to the deviation between measured data and a target value, and self-adaptive control is achieved. Thus, high-precision simulation, optimization design and intelligent control are combined, the problem that the control effect is poor due to model simplification and fixed parameters in a traditional method is solved, and vibration suppression accuracy and environmental adaptability are remarkably improved.

The invention provides a seismic isolation structure AMD control system based on the seismic energy storage principle, and relates to the technical field of structural engineering and damping control. The bottom of the building dissipates energy through the shock insulation support and the hydraulic inerter damper, earthquake input is converted into gravitational potential energy, mechanical energy and electric energy, and the energy storage module supplies energy to the active tuned mass damper arranged on the top of the upper structure. The system monitors structural response in real time through the acceleration sensor and the force sensor, the AMD intelligent control unit calculates and outputs control force capable of reducing upper vibration and generating reverse overturning bending moment, and therefore structural vibration is restrained and the shock insulation support is prevented from being pulled under the strong shock working condition, and the overall anti-seismic performance of the shock insulation structure is remarkably improved.

The invention provides a low-frequency tuned mass damper which comprises a mass damping unit, a frequency modulation supporting unit and a fixed force transmission unit, an included angle is formed between the mass damping unit and the vibration direction of a main structure, the frequency modulation supporting unit is arranged at the bottom of the mass damping unit, and the fixed force transmission unit is connected with the main structure. The vibration frequency of the mass damping unit is adjusted by changing the recovery acceleration; the mass damping unit comprises a mass transmission part, a rotating part, an eddy current damping part and a swing part which are sequentially connected from the included angle of the mass damping unit to the bevel edge direction, and the swing part is rotationally connected to the fixed force transmission unit. The mass transmission part comprises a mass block and a rotation transmission part providing rotation acting force for the mass block, and the mass block makes contact with the rotation transmission part and is fixedly connected with the rotating piece. The invention has the advantages of solving the problem of low-frequency vibration, reducing the structural size, reducing the installation difficulty and the like.

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

The present application belongs to the technical field of low-frequency vibration control, and aims at the problem that the traditional tuned mass damper is limited in vertical space use due to the excessive spring net deformation under low-frequency conditions, and provides a low-frequency tuned mass damper device which reversely stretches the compression spring. The device fully realizes the compression large deformation and reverse stretching deformation of the spring in the limited vertical space through the way of over-compression and reverse stretching of the compression spring, so as to achieve the required low stiffness of the vibration system. The low-frequency tuning can be realized in the limited vertical space of the bridge girder, and the frequency application range of the tuned mass device is greatly expanded. At the same time, the stability problem of the traditional compression spring mass body placed on the spring and the problem of excessive and unstable damping caused by the increase of the guide component are avoided. The device has simple structure, low damping, low space requirement and good stability, and can be applied to vertical, lateral and torsional multi-type low-frequency vibration control of various engineering structures.

This invention relates to a multi-mode vortex-induced vibration control method for long-span bridges based on multiple SATMDI (Self-Active Capacitive Tuned Mass Damper) dampers, belonging to the field of structural vibration control. The invention addresses the problem of insufficient optimization in existing semi-active controlled SATMDI settings. The method comprises the following steps: Step 1: Establishing a finite element model of the bridge and extracting modal information for each order; Step 2: Screening the bridge modes, retaining modes with natural frequencies lower than the highest vortex shedding frequency; Step 3: Determining the vortex-induced vibration amplitude limits [A] for each mode requiring control. n ], and then obtain the allowable value of the peak value of the dynamic amplification coefficient of each mode of the bridge; Step 4, divide the retained modes into G groups, and obtain the sum of the minimum additional mass required for each group of modes; Repeat step 4 P times, regrouping each time, and obtain P results; Step 5, take the grouping strategy with the minimum value among the P results as the optimal grouping strategy, and obtain the minimum additional mass required to control all modes and the corresponding optimal SATMDI deployment position.

The invention provides a self-adaptive tuned mass damper and a parameter adjusting method. The self-adaptive tuned mass damper comprises a tuned mass damper body, a mass detection system, a hydraulic system and a control system. The tuned mass damper comprises a counterweight liquid container, a valve control damper and a spring; the counterweight liquid container is fixedly connected with the lower part of the machine tool workbench; the other end of the spring is connected with the counterweight liquid container; one end of the valve-controlled damper is connected with the machine tool workbench, and the other end is connected with the counterweight liquid container; the quality detection system is used for detecting the mass of the machine tool turntable main system and the mass of the counterweight liquid container; the control system is used for controlling the hydraulic system to adjust the mass of the balance weight liquid container and the damping coefficient of the valve control damper in real time according to a relation model of parameters of the self-adaptive tuned mass damper ATMD and the mass of the machine tool rotary table main system. A hydraulic system is controlled to adjust the mass of a counterweight liquid container and the damping coefficient of a valve control damper in real time according to a relation model of parameters of the self-adaptive tuned mass damper and the mass of a machine tool rotary table main system; the problems that the inherent frequency of a system is changed and the vibration reduction effect of a traditional constant-parameter tuned mass damper is invalid due to continuous reduction of the workpiece quality in cutting machining are effectively solved, the quality time-varying working condition of cutting machining of a numerical control machine tool is efficiently adapted, the machining precision is effectively improved, and the service life of machine tool parts and cutters is prolonged.

The invention discloses a cantilever beam vibration absorber and a Tokamak device, and belongs to the field of vibration control. The cantilever beam vibration absorber comprises an acoustic black hole cantilever beam which comprises an acoustic black hole structure; the piezoelectric element is located on any surface of the acoustic black hole structure in the thickness direction; the piezoelectric shunt circuit is electrically connected with the piezoelectric element; the damping layer is located on at least one side of the acoustic black hole structure in the thickness direction; the tuned mass block is located on the side, away from the acoustic black hole structure, of the damping layer. Broadband vibration reduction can be achieved, the vibration reduction frequency is flexible, accurate and adjustable, and the vibration reduction effect is effectively improved.

Tuned viscous mass damper and building structure provided with the damper, relate to building shock absorption technical field, the tuned viscous mass damper of the present application includes the flywheel of the rod-shaped component and the sleeve setting on the rod-shaped component, the motion conversion mechanism that is equipped with the cooperation between the rod-shaped component and flywheel, the motion conversion mechanism is configured as in the process of the reciprocating motion of the rod-shaped component along the axial drive flywheel to the same direction rotation.The present application can improve the reliability of tuned viscous mass damper and reduce its use cost.

The application relates to a design method of a mass-spring damper vibration reduction structure, which can realize accurate and efficient control of specific multi-order and high-order modal responses of the structure, selects relative deformation of a mass-spring system installation position as a main degree of freedom, targets the shape of a structure deformation as a vibration mode of the structure, decouples a multi-degree-of-freedom original structure into a plurality of main degree-of-freedom systems of additional masses, calculates mass-spring system parameters required by a control target mode through an analytical expression, and determines an arrangement position. Compared with the prior art, the application can accurately reduce the response of a target mode without changing the period and vibration mode of other modes, and has the advantages of high precision, low calculation amount and easy realization.

The invention belongs to the technical field of vibration reduction control of high-rise structures such as power transmission towers, and particularly relates to a tuned mass damper with eddy current and particle damping and adjustable frequency damping. Comprising a mass block, a compression spring, a guide rod, a linear bearing, a copper plate, a back plate, a rubber gasket, a first countersunk head screw assembly, a first permanent magnet set, a second countersunk head screw, a cover type nut, a shell cover plate, a shell, a sealing plate, a sealing ring, a steel pipe, a hoop assembly, a hexagon bolt assembly, a silicon steel sheet and a second permanent magnet set. The mass block is a rectangular thick plate, and the compression springs are arranged on the upper and lower surfaces to form an oscillator system. Copper balls and permanent magnets are additionally arranged on the basis of common eddy current damping to form a second damping system, eddy current damping and particle damping are combined, and the vibration reduction effect is better; under the same appearance size, damping and frequency are adjustable, the vibration reduction requirements of steel pipes at different positions of a power transmission tower are met, parts can be machined in batches during production, the damping ratio and frequency can be debugged on site, the vibration reduction requirements of different objects are met, and the project execution time is saved.

The present application belongs to the technical field of low-frequency vibration control, aiming at the problems of high damping ratio, instability, low vibration control efficiency and unsuitable for large-scale engineering of existing inertial damper, a low-damping tuned inertial damper device is provided, which provides the possibility for the whole system to realize the required optimal damping ratio, and further efficiently controls low-frequency resonance. Unlike traditional rigid support and transmission mode, the device adopts economical, reliable and convenient flexible suspension support and transmission mode to realize low frequency and stable low damping of the system. The flexible support part and the rigid inertial device are in contact transmission around, which eliminates the high damping caused by high energy consumption due to instability caused by friction and collision in traditional inertial tuned mass damper, so as to ensure that the large inertial system realizes stable low damping ratio, meets the needs of realizing optimal control effect, and is directly applied to large engineering structure resonance control.

The invention discloses a tuned mass damper. The tuned mass damper comprises an installation base, a damping device and a mass tuning assembly. The damping device is arranged on the mounting base, and the mass tuning assembly is arranged on the mounting base and connected with the damping device. The damping device comprises a damping cylinder, a piston assembly and a siphon, the damping cylinder is filled with damping liquid, the siphon is arranged on the outer side of the damping cylinder, the first end and the second end of the siphon communicate with the damping cylinder, the height difference exists between the first end and the second end, and the height of the siphon is located below the liquid level of the damping liquid. The piston assembly is connected with the mass tuning assembly, and at least part of the piston assembly is arranged in the damping liquid so that the piston assembly can move in the damping liquid along with vibration of the mass tuning assembly. According to the tuned mass damper, the problems that a traditional tuned mass damper has excessive suppression during slight vibration and is insufficient in damping during violent vibration can be effectively solved.

The application discloses a chimney tuned mass damper. The chimney tuned mass damper comprises a mounting main plate, four adjusting structures are fixedly installed on the top of the mounting main plate, and the four adjusting structures comprise first damping pipes. In the application, when different intensity impacts are coped with, the rotating rod drives the gear to rotate by rotating the rotating valve, the telescopic rod moves up and down in the first damping pipe because the gear and the teeth of the telescopic rod are engaged, the length of the air column in the first damping pipe is changed because the sealing gasket is sealed with the first damping pipe when the telescopic rod moves in the first damping pipe, the damping force generated when the first spring drives the damping rod to compress is changed, different intensity impacts can be coped with, the damping intensity can be adjusted according to different impact intensities, and thus the purpose of adjusting the damping intensity according to different impact intensities is achieved.

The present application relates to the technical field of building vibration reduction, and provides a liquid tuned mass damper and a design method, wherein the liquid tuned mass damper comprises a mass block, an elastic element and an oscillation plate; one end of the elastic element can be connected to a controlled structure, the mass block is connected to the other end of the elastic element; the oscillation plate is connected to the mass block; the oscillation plate and the elastic element have an included angle in the extension direction; and the oscillation plate can be immersed in a fluid. The liquid tuned mass damper can solve the problems that the existing tuned mass damper only generates inertial mass by the mass block, a mass block with a large mass is required, and a mechanical oil pressure damping element is required, resulting in high manufacturing cost, and the mass block is too heavy to cause a large static load on the controlled structure.

The application relates to the technical field of wind power generation, and discloses a wind turbine design method adopting a frictional tuned mass damper, which adds a frictional tuned mass damper to a man platform in a tower drum of a wind turbine, establishes a motion equation of the wind turbine after adding the frictional tuned mass damper based on a structural dynamics principle, deduces a mathematical analytic expression of a system dynamic coefficient, and obtains parameters of the frictional tuned mass damper through a system optimization theory. The application solves the problems that the prior art is difficult to realize damping through the tuned mass damper in the narrow space in the cabin or the tower drum, and the damping control effect is poor.

The invention belongs to the field of structural engineering and fluid mechanics, and particularly relates to a passive vortex vibration control device and method based on a collision type tuned mass damper and synthetic jet flow combination. The control device comprises a piston cylinder arranged in the bluff body structure, a piston capable of doing reciprocating motion is arranged in the piston cylinder, through holes are formed in the surfaces, located on the two sides of the piston cylinder, of the bluff body structure, and the two ends of the piston cylinder are communicated with the through holes through fluid pipelines. When vortex-induced vibration happens to the bluff body structure, the piston is driven by structural vibration to reciprocate in the piston cylinder, on one hand, the damping control effect of the tuned mass damper is generated, vibration energy is dissipated through gas compression and expansion, on the other hand, fluid is driven to flow in the fluid pipeline, periodic zero-mass synthetic jet is generated at the position of the through hole, and the zero-mass synthetic jet is generated. The interference vortex falls off, and the fluid load is reduced. According to the invention, through two cooperative physical mechanisms of damping control and flow control, the vortex vibration of the structure is jointly and efficiently inhibited from two aspects of energy dissipation and energy absorption.

The utility model provides a chimney damping device, which belongs to the technical field of chimney damping, and comprises a mounting assembly and an adjusting assembly, the mounting assembly comprises a mounting track annularly arranged on the periphery of a chimney and a mounting seat slidably connected to the mounting track, and the mounting track is connected to the chimney; the adjusting assembly comprises a fixing rod connected to the mounting base and a balance weight mechanism connected to the fixing rod, the fixing rod extends in the radial direction of the mounting rail, and the balance weight mechanism is located at the end, away from the mounting base, of the fixing rod. The balance weight mechanism comprises a balance weight block connected to the fixing rod in a sliding mode and two elastic pieces connected to the balance weight block, and the two elastic pieces are arranged on the two sides of the balance weight block respectively along the extending path of the fixing rod. The utility model provides a chimney damping device which aims at solving the problem that when an existing tuned mass damper faces nonlinear vibration, the damping effect of the damper is poor.

The application discloses a multi-point control system for building horizontal vibration, which comprises a plurality of main-passive hybrid tuned mass dampers and a control system. The main-passive hybrid tuned mass damper comprises a tuned mass damper and an actuator arranged on both sides of the motion direction of the tuned mass damper. The control system comprises a collector for collecting floor displacement and acceleration signals, and a controller. The actuator is electrically connected with the controller. The controller judges whether to take active or passive control according to the floor displacement and acceleration signals collected by the collector. The controller judges whether the actuator works and controls the force required according to the floor displacement and acceleration signals collected by the collector. The application is provided with a plurality of main-passive hybrid tuned mass dampers, which is a main-passive hybrid control system. Even if the active control part fails, the passive control part can still ensure partial vibration reduction effect, and the application has good robustness.

The invention discloses an arch bridge rigid suspender tuned mass inertial torsion damper and an optimization design method thereof.The damper comprises a transmission disc, a dynamic damping disc, a transmission disc and an inerter disc, the transmission disc is fixedly connected with a suspender, the dynamic damping disc is rotatably connected to the suspender, a pre-pressure mechanism is arranged on the transmission disc, and the transmission disc is connected with the inerter disc; the dynamic damping disc is provided with a transmission block which is used for being connected with a pre-pressure mechanism so that rotation of the transmission disc can drive the dynamic damping disc to rotate, the transmission disc is connected to the hanging rod in a sliding mode, a plurality of first chiral metamaterial screws are connected between the transmission disc and the dynamic damping disc, and the first chiral metamaterial screws are arranged in a chiral mode. The inerter disc is rotatably connected to the hanging rod, a plurality of second chiral metamaterial screws are connected between the transmission disc and the inerter disc, and the second chiral metamaterial screws are arranged in a chiral mode. The problems that a traditional inerter is large in size, sensitive to amplitude and difficult to adapt to the degree of freedom of torsion are solved, and efficient, broadband and reliable vibration control is achieved.

The invention involves a triangular prismatic tuned mass damper suitable for large-span or cantilever structures, including a triangular prism box, particle damping units inside the triangular prism box, and a steel mass block. Below the triangular prism box are high-damping springs. The particle damping unit consists of a particle damping cavity, particles of three different sizes, and foam rubber pads. When the structural vibration amplitude is small, the particles dissipate energy by compressing the foam rubber pads and rolling. When the amplitude of structural vibration is large, the energy is dissipated by the collision of particles and the compression of the foam rubber.

The utility model discloses a tuned mass damper with a speed locking function for a building, which comprises an upper frame body, a lower frame body, a mass block and a speed locking damper, the mass block and the speed locking damper are arranged between the upper frame body and the lower frame body, and the upper frame body and the lower frame body are connected through a plurality of connecting components. The connecting assembly comprises a stud and two nuts, the two ends of the stud penetrate through the upper frame body and the lower frame body respectively and then are connected with the two nuts, lantern rings are arranged on the mass blocks, the lantern rings are arranged on the corresponding studs in a sleeving mode, springs are arranged between the lantern rings and the lower frame body, the springs are arranged on the corresponding studs in a sleeving mode, and the springs are connected with the two ends of the stud. The two ends of the spring abut against the lantern ring and the lower frame body respectively, and the two ends of the speed locking damper are connected with the mass block and the lower frame body respectively.

The invention relates to a horizontal rotation vibration suppression method for a wind turbine blade hoisting system. The method comprises the following steps: acquiring basic parameters of a blade hoisting system; the inherent frequency of horizontal rotation of the main structure is obtained; at least two tuned mass dampers are arranged on the blade hoisting system to form the blade hoisting system with multiple tuned mass dampers; calculating a dynamic matrix equation of the blade hoisting system provided with the multi-tuned mass damper; calculating a response equation of horizontal rotation of the main structure; and calculating parameters of each tuned mass damper according to the response equation, and optimizing the parameters to obtain the vibration suppression blade hoisting system with the tuned mass damper with the optimal parameters. According to the method, the parameters of the mass damper are optimized by considering the installation position and the parameters of the mass damper and the response equation of horizontal rotation of the main structure, the optimal rigidity coefficient and the optimal damping coefficient are obtained, and therefore the optimized multi-tuned mass damper system is obtained, and the vibration suppression effect is better.