51results about How to "Good vibration control" patented technology

A vehicle has a drive control ECU that controls an internal combustion engine or a transmission on the basis of a target drive force. The drive control ECU has a first arbitrator that sets the target drive force on the basis of a driver's request and the like, and filters that have individually different damping characteristics and that correct the target drive force from the first arbitrator so that the vibration of a sprung weight of the vehicle is controlled, as well as a switch that includes a switching portion and a filter setting portion. The filter setting portion determines whether a pitching resonance frequency has changed. If having determined that the pitching resonance frequency has changed, the filter setting portion switches the filter having been used for correcting the target drive force to a filter corresponding to a post-change pitching resonance frequency.

The invention discloses a magneto-rheological semi-active damper with adjustable stiffness. The damper comprises an outer annular cylinder fixed on the inner wall of a container and an inner cylinder;scrollable balls are arranged between the lower portion of the inner cylinder and a bottom plate of the device, and the inner cylinder and the outer annular cylinder are filled with a magneto-rheological liquid respectively; hollow spring pipes are connected between the cylinder walls of the inner cylinder and outer annular cylinder, the inner cylinder and the outer annular cylinder are communicated with each other through the hollow spring pipes, the magneto-rheological liquid can flow in the inner cylinder and the outer annular cylinder through the hollow spring pipes, the outer portions ofthe spring pipes are provided with magnet exciting coils, the magnet exciting coils, controllers and a solar panel arranged at the outer side of the upper portion of the container are connected in series to form a closed loop circuit, the controllers receive signals of acceleration sensors to control the current in the magnet exciting coils, thereby adjusting the stiffness of the hollow spring pipes and achieving the horizontal damping control; limiting plates are arranged between the outer annular cylinder and the inner cylinder to prevent the inner cylinder from being displaced too much; damping nets are arranged in the outer annular cylinder, and the torsion damping control is achieved through damping force.

The invention relates to a vibration damper for a photonic crystal with an adjustable cell property period array. According to the vibration damper, the influence of a photonic crystal weak joint interface (or interface layer) on a band gap is considered, the controllability of physical and mechanics parameters under magnetorheological elastomers field conditions is utilized, an appropriate mechanism is built, and a controllable cell material physical property and interface layer geometrical parameters are obtained, so that the random vibration control photonic crystal variable band gap range suitable for multiple working condition control structure system obtained in a photonic crystal mechanism is realized, and the vibration damping efficiency of structural vibration control is improved.

The invention relates to a vertical viscous damper connected energy-dissipating-and-shock-absorbing outrigger truss high-rise structural system. According to the structural system, by taking a framework-core tube structure for example, an outrigger truss is arranged between a core tube and giant concrete columns, so as to coordinate the deformation between the core tube and a framework under the action of a horizontal load; the outrigger truss consists of horizontal chord members, diagonal web members and vertical web members; corbels are arranged on peripheral giant columns, joints between the outrigger truss and the giant columns are appropriately disconnected, and viscous dampers are arranged vertically; the viscous dampers are fixedly arranged on the corbels, one position of the outrigger truss is connected to the dampers, and one position of the outrigger truss is hinged to the giant columns; under the action of wind vibration and / or earth shock, the giant columns and the outrigger truss undergo relative dislocation, and viscous fluid in the viscous dampers passes through a damping passage under the action of pressure difference, so that a damping force is generated, and the vibrational energy of an outside input structure is dissipated. The structural system has the advantages that the viscous dampers can generate an energy dissipating effect by using the relative dislocation between the giant columns and the outrigger truss, and the structural system is effective under the action of wind vibration and / or earth shock, so that the earthquake resistance of a main body structure can be excellently improved.

The invention discloses an initiative electromagnetic control system for slab and girder structure vibration. The initiative electromagnetic control system comprises a mechanical portion and a control portion. The mechanical portion comprises a wall made of nonferromagnetic materials, a slab and girder structure and electromagnets. One end of the slab and girder structure is connected with the wall, a displacement sensor is arranged on the slab and girder structure, and the electromagnets include electromagnets A, B, C and D. The control portion comprises a computer, a power amplifier and a full-wave rectification circuit without a filter. The computer is connected with the displacement sensor, an input end of the power amplifier is connected with the computer, one path of an output end of the amplifier is connected with the electromagnets A and D through a bridge rectification circuit without a filter while the other path of the same is directly connected with the electromagnets B and C. When the slab and girder structure vibrates, magnetic pole polarity and magnetic field intensity of the electromagnets can be automatically changed to attenuate the vibration quickly, so that damages to a mechanical system caused by vibration are reduced.

The invention relates to a high-speed train set body elastic mode vibration control method. The method comprises the following steps: S1, a train set body entity model is acquired, elastic mode vibration energy distribution is acquired, and a train set body vibration control target mode is determined; S2, mounting positions of multiple bottom suspension devices are determined, and an equivalent modal mass of the train set body vibration control target mode located at each bottom suspension device mounting position is determined; S3, natural frequency and a damping ratio of a vibration reduction system for each bottom suspension device are determined; and S4, transverse stiffness, vertical stiffness and a damping coefficient of the vibration reduction system for each bottom suspension device are determined. Compared with the prior art, the method of the invention does not need to change the original light-weight train set body structure but realizes control on multi-order elastic modal vibration of the train set body, the train set operation stability is enhanced, the train set riding comfort is improved, the principle is clear, the execution is convenient, the cost is low, and the method is applied to control on the high-speed train set body elastic mode vibration.

The invention relates to a method and a device for controlling the vibration in an automobile hierarchical modeling manner. The method comprises the following steps: sending the data of eight vertical and lateral road roughness sensors to a CPU processor, integrating the hierarchical modeling algorithm and obtaining the motion state of the centroid of suspended mass, the constrained force of suspended mass, and acceleration predictive values obtained by predicting and decoupling the vertical and lateral acceleration variable quantities of No.1 to No.4 suspension brackets, through the operation; respectively transmitting to eight vertical and lateral matrix control quantity operation module of No.1 to No.4 units; obtaining theoretical quantity of controllable actuators of No.1 to No.4 units after the synthesis is conducted; conducting the conversion operation of actuating quantity because the data received by each actuator generates the corresponding action. The invention has the advantages that the hierarchical control architecture built on the basis of considering the common influence of the vertical excitation and the lateral excitation of the road is converted into eight four-multiplied-four matrix, so as to simultaneously conduct the control quantity operation of four controllable actuators and the vibration control, thereby reducing online operation time and reaching the optimum vibration control effect of the whole automobile.

The invention discloses a double-clutch hybrid control unit, comprising a subtractor, a proportion integration differentiation (PID) controller, an electric motor, an engine and a summer, wherein the subtractor is used for obtaining a difference of a vehicle speed and a gearbox input revolving speed; the PID controller is used for regarding the output of the subtractor as the input of the PID controller, obtaining an electric motor torque correction artificial signal through PID calculation, and adjusting the torque output of the electric motor; the electric motor adjusts the an electric motor torque according to the artificial signal; the engine adjusts an engine torque according to an accelerator; and the summer is used for adding the electric motor torque and the engine torque to obtain an output torque. The invention also discloses a double-clutch hybrid control method and a double-clutch hybrid control system. The double-clutch hybrid control unit, method and system disclosed by the invention can be used for electric vehicles and hybrid vehicles, and have less system vibration response.

The invention belongs to the field of dampers and discloses an inertia mass tuning electromagnetic damper. The inertia mass tuning electromagnetic damper comprises a shell, a linear guide rail, a ballscrew mechanism, a fixing base, an accelerator, a direct-current generator, a mass block and tuning compression springs, wherein the linear guide rail, the ball screw mechanism, the fixing base, theaccelerator, the direct-current generator, the mass block and the tuning compression spring are arranged in the shell; a right end cover is movably provided with an external connection frame, the leftend of the external connection frame penetrates through the right end cover and then extends into the shell, and the left end of the external connection frame is fixedly connected to a ball nut; theleft end of a lead screw is connected with an input shaft of the accelerator through a first coupler, and an output shaft of the accelerator is connected with the direct-current generator through a second coupler; and the two tuning compression springs are both installed on the lead screw in a penetrating mode. The inertia mass tuning electromagnetic damper can convert energy generated by an external vibrating mechanism due to vibration into movement kinetic energy of the mass block as well as electric energy of the direct-current generator to be greatly consumed, thereby achieving the vibration reduction / shock absorption effect.

A material for vibration control of the invention includes a propylene polymer (A) containing a constitutional unit (a) derived from propylene in the proportion of 40 to 100 mol % and a constitutional unit (b) derived from α-olefin having 2 to 20 carbon atoms excluding propylene in the proportion of 60 to 0 mol % [provided that the total of (a) and (b) is 100 mol %], and having a melting point measured by DSC of 90° C. or below or no observed melting point, and the material has excellent vibration controllability such as vibration damping property, vibration preventing property, sound insulating property, and sound absorbing property.

The present invention provides a suspension control apparatus capable of an excellent vibration control by a model thereof designed to incorporate nonlinearity and a time-lag element of a control damper. The present invention employs the backstepping method which is one of nonlinear control methods, and is designed so as to incorporate the nonlinearity of a damper 4. In addition, a nonlinear controller 5 uses a damping force Fu obtained by expressing the dynamics of a damping force characteristic variable portion [damping force Fu(v, i)] by a first-order lag system, so as to compensate the dynamics of the damper 4, whereby a control system is formed so as to incorporate the time-lag element of the control damper. As a result, it is possible to reduce time lag, and to practically adjust a control force according to the characteristics of the control damper.

The invention belongs to the technical field of fluid machinery, and relates to a motor embedded impeller type integral flow channel axial flow fan. The axial flow fan comprises a front air cylinder and machine base assembly, an impeller, a motor stator and a rotor assembly. The rotor assembly is arranged in the front air cylinder and machine base assembly and coaxial with the front air cylinder and machine base assembly, and the motor stator is arranged in the circumferential direction of the rotor assembly in a surrounding mode. The electromagnetic force of the motor stator directly drives the rotor assembly to rotate around the axial direction of the rotor assembly, the impeller is arranged at the top of the front air cylinder and machine base assembly and connected with the rotor assembly, and the outermost diameter of the impeller is smaller than the inner diameter of the front air cylinder and machine base assembly. The rotor assembly drives the impeller to rotate synchronously.The motor embedded impeller type integral flow channel axial flow fan reduces the axial size, effectively reduces the overall weight, relieves the vibration generated when a motor and the impeller rotate, and can meet various performance requirements of the fan in a limited space.

The invention discloses a structural vibration-oriented active control optimal configuration method and a vibration control experiment platform. A piezoelectric intelligent cantilever beam is taken asa research object, an optimal configuration method of a piezoelectric sensor and an actuator in structural vibration active control is provided, firstly, providing sensor and actuator optimization criteria according to a research model, and establishing an optimization objective function; secondly, solving the inherent frequency, modal strain and the like of each order of the piezoelectric cantilever beam, and substituting the inherent frequency, modal strain and the like into an optimization objective function; carrying out configuration optimization by adopting a genetic algorithm to obtaina preliminary optimal configuration scheme; thirdly, performing a comparative vibration experiment of each configuration scheme according to an actual test, and finally determining an optimal configuration scheme; and finally, establishing a vibration control system experiment platform according to the final configuration scheme, and carrying out structural vibration active control experiment verification. Experimental results show that the vibration control effect is good, so that the feasibility and effectiveness of the optimal configuration scheme provided by the invention are indirectly verified.

The invention provides a micro-wind vibration energy consumption suppression device for a service steel pipe tower rod part, and the device is suitable for vortex-induced wind vibration control of animportant lattice type steel pipe tower framework part such as a power transmission tower. The micro-wind vibration energy consumption suppression device is composed of a steel sleeve sheet, a first viscoelastic material, a second viscoelastic material, SMA springs, a flow guide sheet, connecting bolts and connecting plates. The device has a two-stage micro-wind vibration control effect, can destroy the Karman vortex to inhibit or reduce the generation of micro-wind vibration, and can completely achieve the purpose of controlling the micro-wind vibration of a steel pipe component through the deformation consumption of the viscoelastic materials. Meanwhile, the SMA springs with the super-elastic effect are connected between the steel pipe and the steel sleeve, so that the device has a remarkable self-resetting capability. The device is simple in structure, light in structure, flexible in arrangement, low in manufacturing cost and convenient to replace. The device has the self-resettingcapability, is strong in resistance to external interference and is good in robustness; and the two-stage micro-wind vibration control principle is achieved, the vibration control effect is remarkable, good social and economic benefits are achieved, and the application prospect is wide.

A material for vibration control of the invention includes a propylene polymer (A) containing a constitutional unit (a) derived from propylene in the proportion of 40 to 100 mol % and a constitutional unit (b) derived from α-olefin having 2 to 20 carbon atoms excluding propylene in the proportion of 60 to 0 mol % [provided that the total of (a) and (b) is 100 mol %], and having a melting point measured by DSC of 90° C. or below or no observed melting point, and the material has excellent vibration controllability such as vibration damping property, vibration preventing property, sound insulating property, and sound absorbing property.

The invention relates to a buffering and damping device with the adjustable rigidity and a mounting method of the buffering and damping device, and belongs to the technical field of the damping components and mounting. The buffering and damping device comprises transverse damping elastomers, a conical receiver, a rigid shaft body and a vertical damping module, wherein the conical receiver, the rigid shaft body and the vertical damping module are coaxially arranged; the transverse damping elastomers are arranged around the side face of the conical receiver at intervals, the conical receiver isconnected with the vertical damping module through the rigid shaft body, and the vertical damping module is arranged below the conical receiver; and the vertical damping module comprises a shell and abutterfly-shaped spring set, one end of the rigid shaft body is connected with the conical receiver and serve as a center guiding tube to penetrate through the butterfly-shaped spring set, and when being mounted in a large-mass and complex environment, the vertical damping module further comprises a viscous damper. The mounting process of the buffering and damping device is easy and rapid, through combined action of the transverse damping elastomers and the vertical damping module, impact energy produced by collision in the mounting process of an upper structure and a lower structure can be fully absorbed, and impact damage is maximally reduced.

The invention discloses an adaptive internal model vibration control method based on gray information optimization for intelligent fan blades. The method aims at various uncertain factors existing in the vibration system of intelligent fan blades in a complex operating environment, and adopts a method based on gray information theory optimization. The self-adaptive internal model vibration control method uses the differential evolution identification method of gray relational optimization to accurately identify the blade vibration system under the influence of uncertainty, making the identification of the internal model vibration process more ideal and accurate; The parameters of the modal vibration controller are adaptively optimized and adjusted, which is conducive to improving the dynamic characteristics and robustness of the control system, so that the closed-loop system can achieve high-performance adaptive vibration control of intelligent fan blades while overcoming the influence of uncertain factors. Through the present invention, the gray optimization self-adaptive internal model vibration control method provided can overcome the influence of multiple uncertain factors of intelligent fan blades in a complex working environment.

The invention provides a global controllable duplex semi-active vehicle suspension system which comprises a guide mechanism and a four-quadrant semi-active damping adjustable actuator, the four-quadrant semi-active damping adjustable actuator comprises a damping mechanism and a duplex mechanism, and the duplex mechanism comprises a first rack, a second rack and a reversing gear. The reversing gearis located between the first rack and the second rack and engaged with the first rack and the second rack. The damping mechanism comprises two damped and adjustable shock absorbers, the top ends of shock absorber bodies of the two shock absorbers are jointly installed on the same tower top, and the bottom ends of piston rods of the two shock absorbers are connected with the top ends of the two racks respectively; the bottom end of the first rack is hinged to a steering horn of the guide mechanism, and the tower top of the damping mechanism is connected with a vehicle body. And a gear shaft ofthe reversing gear is connected with the frame or the vehicle body through a connecting rod. The global controllable duplex semi-active vehicle suspension system has the advantages that the semi-active vehicle suspension system has a global control range and is low in energy consumption and high in reliability.

The invention provides a design method of a vibration control structure for a historic building close to a subway, which comprises the following steps of: (a) establishing a corresponding subway tunnel-soil layer finite element analysis model according to an operated similar subway road section; (b) actually measuring the vibration response of the control point in the operated similar subway section, and comparing and checking the calculated value of the vibration in the step (a) by utilizing the actually measured value; (c) establishing an ancient building finite element analysis model; (d) actually measuring the dynamic characteristics of the historic building, and comparing and checking the calculated value of the basic frequency in the step (c) by utilizing the actually measured value; (e) modeling by taking the historic building and the vibration isolation layer as an integral structure, and comparing and adjusting related parameters of the vibration isolation layer; and (f) according to the steps (a)-(e), creating a tunnel-soil layer-historic building finite element analysis model, the design method can effectively reduce the influence of subway vibration on the adjacent historic building, and the vibration control requirement of the historic building is met.

The invention provides a PID control optimization method for a vibration system based on a grey random differential evolution algorithm. The method comprises the steps of carrying out initialization on a PID control parameter, i.e. a target vector, calculating and updating a mutation factor and the crossover probability according to the grey correlation and a random adaptive strategy, then carrying out a mutation operation, a crossover operation and a selection operation to obtain the target vector of the next generation, i.e. the new PID control parameter, and iterating in the above mode until the set maximum number of iterations is reached. In the invention, the grey random differential evolution algorithm can update the mutation factor and the crossover probability by using a grey random adaptive mechanism, so that the optimal PID control parameter of the vibration system can be efficiently searched with a smaller number of iterations and a smaller population size.

The invention relates to the technical field of bridge engineering, and particularly relates to a stressed ribbon bridge vehicle-induced vibration control method based on an eddy current tuned mass damper. The method comprises the steps of for a vehicle stressed ribbon bridge system, respectively solving dynamic responses in an uncontrolled state and a controlled state, wherein the controlled state is that an eddy current tuned mass damper is added into the vehicle stressed ribbon bridge system, and the uncontrolled state is that no eddy current tuned mass damper is added to the vehicle stressed ribbon bridge; establishing a response surface model based on the eddy current tuned mass damper; constructing a damper parameter optimization objective function according to the peak values of thedynamic response in the uncontrolled state and the controlled state; optimizing the damper parameters by utilizing the damper parameter optimization objective function and the response surface model,and determining the optimal damper parameters; and setting the vehicle stressed ribbon bridge system according to the optimal damper parameters. The method is suitable for a nonlinear coupling system, and a better bridge vibration control effect is achieved by using the eddy current tuned mass damper.

The invention relates to an anti-side shift wind power generation tower. The anti-side shift wind power generation tower includes a tower base fixed on a ground surface; a wind power generation rack arranged on the tower base and using wind to generate power; electromagnetic dampers arranged between the wind power generation rack and the tower base, wherein a side shift torque acted on the tower base can be reduced through an electromagnetic energy consumption manner. Compared with the prior art, the electromagnetic dampers are arranged between the wind power generation rack and the tower base, swinging energy of the tower base due to wind force can be reduced through the electromagnetic energy consumption manner, the side shift torque acted on the tower base can be reduced, and a damping effect can be achieved; and the anti-side shift wind power generation tower is easy to produce, is low in maintenance cost, and is high in practicality.

The invention provides a water tank damper for controlling buffeting response in the bridge construction period, the partition plates and the partition plate positioners are additionally arranged in atraditional water tank damper, the water depth does not need to be changed, and the partition plate positioners can be used for conveniently and rapidly adjusting the different intervals of the multiple partition plates to achieve adjustment of multiple target frequencies of water body vibration; therefore, the purpose of controlling the buffeting of various frequency components is achieved. Thewater tank damper has the advantages that only one water tank is needed, the water depth does not need to be changed, the target frequency of the water body can be quickly adjusted only by adjusting the distance between the partition plates through the partition plate positioner, operation is more convenient, and efficiency is higher; multiple target frequencies can be realized at the same time byonly one water tank and a plurality of partition plates, so that the targets which can be realized by several different water tanks in the traditional method are finished, the cost is lower, and thepracticability is higher; the partition plate can adopt a rigid corrugated windproof net and is high in rigidity, light in weight and low in price, and the vibration control effect is superior to thatof a flat plate; the water depth adjusting frequency does not need to be adjusted repeatedly like a traditional water tank, workloads are reduced, the construction period is shortened, and cost is reduced.

According to the ship rotating mechanical equipment feedforward vibration control system based on supervised learning, by means of the pre-trained supervised learning model, the model parameter Apq of the secondary channel model can be updated on line according to different working conditions, and meanwhile weight parameters are updated according to historical acceleration signals, rotating speed signals and the like; and finally, based on the rotating speed signal filtered by the model parameter Apq and the weight parameter, obtaining a current signal of the driving motor for inhibiting the vibration of the rotating mechanical equipment, so that the influence of the vibration working condition change on the secondary channel is considered, the algorithm precision is higher, the method is more suitable for the vibration working condition change, and a better vibration control effect can be achieved.

The invention discloses a two-degree-of-freedom dynamic vibration absorber joint optimization method, which comprises the following steps of: step 1, establishing a motion differential equation of a four-degree-of-freedom system of a coupled dynamic vibration absorber to obtain an analytical expression of amplitude-frequency characteristic sum of displacement x1, angular displacement [theta] 1, vertical acceleration and angular acceleration of a main system to an input f; step 2, optimizing the stiffness k3 and k4 of the elastic element of the dynamic vibration absorber and the damping coefficient c of the damper by taking the minimum peak value of the amplitude-frequency characteristic sum as an optimization target to obtain an optimal solution set; and step 3, after sorting the elementsin the optimal solution set, selecting the element with the minimum ordinal number as the solution of the optimization design of the two-degree-of-freedom dynamic vibration absorber. According to thetwo-degree-of-freedom dynamic vibration absorber joint optimization method provided by the invention, a method of combining multi-objective optimization and multi-attribute decision is adopted to obtain the optimal structure parameters of the two-degree-of-freedom dynamic vibration absorber, so that the two-degree-of-freedom dynamic vibration absorber has a good vibration control effect in the whole frequency range.

The invention provides a micro-wind vibration energy consumption suppression device for a service steel pipe tower rod part, and the device is suitable for vortex-induced wind vibration control of animportant lattice type steel pipe tower framework part such as a power transmission tower. The micro-wind vibration energy consumption suppression device is composed of a steel sleeve sheet, a first viscoelastic material, a second viscoelastic material, SMA springs, a flow guide sheet, connecting bolts and connecting plates. The device has a two-stage micro-wind vibration control effect, can destroy the Karman vortex to inhibit or reduce the generation of micro-wind vibration, and can completely achieve the purpose of controlling the micro-wind vibration of a steel pipe component through the deformation consumption of the viscoelastic materials. Meanwhile, the SMA springs with the super-elastic effect are connected between the steel pipe and the steel sleeve, so that the device has a remarkable self-resetting capability. The device is simple in structure, light in structure, flexible in arrangement, low in manufacturing cost and convenient to replace. The device has the self-resettingcapability, is strong in resistance to external interference and is good in robustness; and the two-stage micro-wind vibration control principle is achieved, the vibration control effect is remarkable, good social and economic benefits are achieved, and the application prospect is wide.

The invention discloses an ultralow-frequency angular vibration control system and an application method thereof. The system comprises a mounting frame and an upper cover plate, multiple steel wire rope vibration isolation units are connected between the upper cover plate and the mounting frame, and a distance in the height direction is formed between the upper cover plate and a bottom plate of the mounting frame. A vertical impact resistance device is fixed in each steel wire rope vibration isolation unit, vibration isolation and impact resistance are integrated, multiple pairs of longitudinal and transverse air bag impact resistance devices are fixed to the corners of an inner cavity of the mounting frame, and impact resistance protection in the transverse direction, the longitudinal direction and the attitude angle direction is achieved. Multiple permanent magnets are fixed to the inner wall of the mounting frame, the same permanent magnets are also fixed to the lower surface of theupper cover plate, when the upper cover plate is fixed above the mounting frame, multiple pairs of parallel and opposite permanent magnet sets are formed between the upper cover plate and the mounting frame, negative rigidity is provided for offsetting positive rigidity provided by the steel wire rope vibration isolation units, and the multidirectional low-rigidity characteristic is achieved. Therefore, the system not only has good vibration control performance, but also has excellent impact resistance.