13results about How to "Achieve Vibration Control" patented technology

The invention relates to the field of active vibration isolation, in particular to a control method and device of an active vibration isolation device, and the active vibration isolation device comprises a controller, a load, a passive vibration isolation unit for supporting the load, a base arranged on the ground and a plurality of inertial mass actuators arranged on the load. The mass center of the base corresponds to the mass center of the load. And each inertial mass actuator is correspondingly provided with a feedback sensor, so that a plurality of feedback sensors are arranged on the load. And a plurality of feed-forward sensors are arranged on the base. The active vibration isolation control method comprises the steps that feedback acceleration collected by the feedback sensor is obtained, and feedback control force corresponding to each inertial mass actuator is determined according to the feedback acceleration. The feedforward acceleration collected by the feedforward sensor is obtained, and the feedforward control force corresponding to each inertial mass actuator is determined according to the feedforward acceleration. And determining the output force of each inertial mass actuator according to the feedback control force and the feedforward control force. And effective suppression of load vibration is realized.

The vibration isolator comprises a top plate, a main air chamber and a base, the main air chamber is installed in the middle of the top of the base, a first piston is installed in the main air chamber, a first swing rod is vertically installed in the first piston, arc-shaped air chambers are installed on the periphery of the main air chamber, and a second swing rod is vertically installed in the first swing rod. A second piston is installed in the arc-shaped air chamber, a second swing rod is vertically installed in the second piston, an air spring is connected to the bottom of the arc-shaped air chamber, a supporting plate is further installed between the air spring and the arc-shaped air chamber, first transverse air chambers are vertically installed on the periphery of the main air chamber, and third pistons are installed in the first transverse air chambers. The third piston is vertically connected with a first guide rod, a rolling wheel is installed on the top of the first guide rod, and the rolling wheel is in rolling connection with the arc-shaped air chamber. The device is high in positioning precision, has the bearing capacity and rigidity adjusting capacity, can adapt to precise instruments of different models, and is wide in application range and high in universality.

The invention provides a mobile semi-active tuned mass damper based on computer vision and monitoring data, which comprises a footbridge main body structure part, a mobile semi-active control part and a computer vision and monitoring data part, and is characterized in that the footbridge main body structure part comprises a bridge deck, a box girder cavity and a guide rail; the movable semi-active control part comprises a rolling trolley, a semi-active tuned mass damper, a temperature controller and a current controller; the computer vision and monitoring data part comprises a camera, an acceleration sensor and a control center computer, the frequency, rigidity and damping force of the semi-active tuned mass damper are adjusted through the control center computer, and the positions of the rolling trolley and the semi-active tuned mass damper are controlled. According to the damper, the vertical frequency, rigidity and damping force of the tuned mass damper can be adjusted in real time, intelligent vibration control over moving random crowds with different densities is achieved, and the better vibration reduction effect is achieved.

The invention discloses a random detuning type track vibration reduction system and a design method thereof.The structure comprises track pieces and vibration reduction units, the track pieces are arranged on a track plate in groups at intervals, the multiple vibration reduction units are arranged on the inner sides and the outer sides of the track pieces or on the track plate, and the multiple vibration reduction units on the same side of the track pieces are distributed corresponding to the longitudinal periodicity of the track pieces; the vibration reduction units on the two sides of the rail piece are symmetrically arranged or arranged in a staggered mode. The main frequency of the vibration reduction unit is close to the band gap frequency of the track structure, the vibration mode of the vibration reduction unit and the vibration mode of the track structure are mutually coupled, so that the resonance structure of the vibration reduction unit and the ballastless track structure generate a coupling effect, the band gap range is enlarged, and the mass, rigidity and installation position parameters of the vibration reduction unit are designed to be randomly distributed. According to the random detuning type design method, the vibration reduction range can be further widened, vibration of the track structure cannot be increased, the vibration reduction unit does not need to be replaced along with service time prolonging or environment changing, and the vibration reduction capacity is effectively improved.

The invention discloses a micro-vibration control construction process for a grating vibration isolation foundation, and relates to the technical field of building construction. Comprising the following steps: S1, measuring and positioning: measuring and releasing sideline control piles of each shock insulation pier and a sand-gravel cushion layer; s2, construction of a graded gravel cushion layer; s3, compaction coefficient detection; s4, paying-off is conducted on the bottoms of the shock insulation piers, wherein the sideline control point of each shock insulation pier is measured and paid off; s5, side formwork installation and steel bar binding, wherein the distance between the vibration isolation pier and the equipment walkway foundation is 10 cm, a foam polyethylene plate with the thickness of 10 cm is adopted as the side formwork, and the side formwork and the steel bars are installed, bound and formed together; s6, mass concrete pouring and temperature control, wherein layered pushing type continuous pouring is adopted, and the thickness of each layer does not exceed 50 cm; s7, concrete curing; and S8, buffer seam treatment. The compaction graded gravel cushion layer is arranged as a vibration isolation filtering layer, and the large-scale independent vibration isolation pier body is combined, so that double isolation of earthquake dynamic response and environmental vibration is effectively realized, and stable operation of a precise instrument is ensured.

The utility model belongs to pipeline damping and noise reduction equipment technical field discloses damping and noise reduction device and pipeline system. The damping and noise reduction device includes damping structure and mass structure, a plurality of damping structures are parallel and interval setting, are provided with a mass structure between any two damping structures, are provided with microperforated array structure on each mass structure, are provided with first containing hole on each damping structure, and multiple first containing holes are used for containing connected pipeline. This damping and noise reduction device can combine local area resonance band gap damping mechanism and microperforated plate sound absorption mechanism, and through integrated design, the mass structure is combined with microperforated structure, realizes low frequency control vibration and wide spectrum noise control. The damping and noise reduction device can adaptively increase or decrease the number of mass structure and damping structure to form a spring-mass multi-degree-of-freedom resonance system, realize vibration control of multiple resonance frequencies without significantly increasing the structure weight, and ensure the damping and noise reduction effect.

The invention provides a bidirectional vibration reduction tuned mass damper for a tower and a vibration control method. The damper comprises a damper mounting frame, a moving mass block, a magnetic suspension damping assembly, an eddy current damping assembly, two groups of elastic recovery assemblies and two groups of horizontal guide assemblies which are arranged in a crossed and layered manner; the damper mounting frame is mounted at the top end of the tower; the moving mass block can be mounted in the damper mounting frame in a multidirectional horizontal moving manner through a horizontal guide assembly, and is mounted in a suspension manner through a magnetic suspension damping assembly arranged in the horizontal guide assembly; the eddy current damping assembly is integrally mounted in the magnetic suspension damping assembly; and the two groups of elastic recovery assemblies are respectively connected between the moving direction of the moving mass block and the damper mounting frame. According to the control method, a tower-damper coupling model is established, and current output to a driver of the damper is controlled and adjusted according to intensity parameters measured in real time. The device has the advantages of being good in damping and restraining effect, compact in structure and the like.

The present invention discloses a self-locking dry friction damper for vibration control of aircraft engine rotors, including a driving mechanism, a locking / unlocking mechanism, a damper housing, a dynamic contact disc, a static contact disc, a static contact disc flexible connection sleeve, a rolling bearing, a housing, a rotor shaft stand and a rotor shaft; the static contact disc flexible connection sleeve is fixedly mounted on the rotor shaft stand, the static contact disc flexible connection sleeve is connected to the static contact disc, and is mounted on the rotor shaft through a bearing; the housing is a round tube structure, the housing is fixedly connected to the static contact disc flexible connection sleeve; the dynamic contact disc is connected to the driving mechanism, the driving mechanism is mounted on the damper housing through a bracket, and the locking / unlocking mechanism is mounted on the damper housing corresponding to the driving mechanism. The present invention effectively solves the problem of a sharp decline in the life of piezoelectric ceramics due to severe heating caused by long-term operation, and meets the technical requirements of vibration control of aircraft engine rotors.

The application relates to an intelligent variable-damping inertance damping system for offshore wind power, which comprises a wind turbine tower, a plurality of variable-damping rods, a mass block, universal rollers, a data acquisition and control module, sensors and a limiting platform; the limiting platform is fixedly arranged in the wind turbine tower, the mass block is arranged on the limiting platform, the two ends of the variable-damping rod are connected to the inner wall of the wind turbine tower and the outer wall of the mass block respectively, the variable-damping rod comprises a viscous damping chamber 21, a flow rate control chamber 25 and an inertance chamber 28; the sensors are arranged on the inner wall of the wind turbine tower and used for monitoring the vibration condition of the wind turbine tower; the data acquisition and control module is used for collecting the data of the sensors and controlling the magnetic field intensity of the electromagnet in the flow rate control chamber of the variable-damping rod, so as to adjust the rotating speed of the variable-speed water wheel, adjust the liquid flow rate and realize intelligent damping regulation and control.

The present invention discloses a pipeline vibration reduction design method based on the coupling of viscous damping and particle damping, including: performing vibration test on the pipeline to be optimized, extracting vibration frequency characteristics, establishing a discrete element-finite element coupling analysis model, matching the vibration reduction frequency bands corresponding to the viscous damping vibration absorber and the particle damping vibration absorber, and determining their various configuration parameters; performing static analysis mode calculation on the optimized new pipeline, obtaining the new pipeline model and the stress distribution diagram of the new pipeline model, comparing the maximum stress value in the stress distribution diagram with the fatigue limit value of the pipeline, so that the maximum stress value of the new pipeline model is less than the fatigue limit value of the pipeline. The present invention utilizes the vibration reduction characteristics of the viscous damping vibration absorber and the particle damping vibration absorber, matches them with the discrete element-finite element coupling analysis model of the pipeline to be optimized, and can specifically reduce vibration and noise in each vibration frequency band of the pipeline, realize vibration control of the full frequency range of the pipeline, and has good vibration reduction and noise reduction effects.

The present invention provides a variable stiffness three-degree-of-freedom quasi-zero stiffness vibration isolator, comprising a top plate, an outer shell, an air spring and an additional air chamber, wherein an air spring is connected to the middle of the top of the additional air chamber, a swing rod is installed on the top of the air spring, the top of the swing rod is vertically connected to the middle of the bottom of the top plate, a support plate A is installed between the additional air chamber and the air spring, an iron pipe A is sleeved on the top of the support plate A and the periphery of the air spring, a coil A is wound around the outside of the iron pipe A, a permanent magnet A is installed above the iron pipe A and the lower part of the swing rod, a support plate A is installed on the top of the permanent magnet A and the swing rod, a support plate B is installed above the support plate A and the inner side of the outer shell, an iron pipe B is sleeved on the top of the support plate B and the periphery of the swing rod, a coil B is wound around the outside of the iron pipe B, and a permanent magnet B is installed above the iron pipe B and on the swing rod. The present invention has the ability to adjust the bearing capacity and stiffness, a wide vibration isolation band, a wide range of application, and strong versatility.

The invention provides an intelligent vibration control system for a site. The intelligent vibration control system comprises a vibration source vibration monitoring module, a protected site vibration monitoring module, a vibration damper module and a processing control module, the vibration source vibration monitoring module and the protected site vibration monitoring module can detect information such as the vibration frequency, the vibration speed and the vibration acceleration of a site and transmit real-time monitoring data to the processing control module. The processing control module analyzes and calculates the collected data, sends out a corresponding instruction and transmits the instruction to the damping device module; the vibration damping device module comprises a lattice type concrete structure and a water pump, and the heights of liquid filled in different lattices in the lattice type concrete structure can be adjusted according to instructions so as to control vibration of different frequencies. The field intelligent vibration control system provided by the invention is wide in applicable vibration source frequency range and good in vibration control effect; the controllable range of the field is large, and vibration control can be achieved on the field with the large depth and width.

The invention relates to the field of vibration and noise reduction of underwater vehicles, in particular to an unmanned underwater vehicle motor vibration and noise reduction device which comprises a motor supporting mechanism and an axial vibration reduction mechanism, and the motor supporting mechanism comprises a supporting platform and an arc-shaped supporting plate. The arc-shaped supporting plate is fixedly installed on the supporting platform, an installation groove with an upward opening is formed in the arc-shaped supporting plate, the installation groove is used for carrying a motor, and a vibration reduction damper set is arranged in the arc-shaped supporting plate; the axial vibration reduction mechanism comprises a magneto-rheological damper, a coupler and a shaft rod, the magneto-rheological damper, the coupler and the shaft rod are arranged in the installation groove, the vibration reduction damper set is arranged in the motor supporting mechanism, the magneto-rheological damper is arranged on the axial face of the motor, and through the synergistic effect of the radial vibration control system and the axial vibration control system, the vibration reduction effect of the motor is improved. Vibration control in the horizontal direction and the vertical direction is achieved, and the vibration reduction effect of the device on the motor is remarkably improved.