165 results about "Magnetic damping" patented technology

The invention relates to a damping spring device suitable for industry or life, in particular to a magnetic damping spring. The magnetic damping spring comprises a supporting cylinder, a force guiding piston, a force guiding piston blocking piece, a supporting rod and two or more magnets. The force guiding piston blocking piece is arranged on the upper portion of the supporting cylinder. The supporting cylinder is of a cylindrical structure, one end of the supporting cylinder is sealed and is a bottom surface, and the other end is of an opening structure for the supporting rod to penetrate; the lower end of the supporting rod penetrates through the force guiding piston blocking piece to be connected with the force guiding piston, and the upper end extends out of an opening in the upper end of the supporting cylinder. A groove is formed in the inner bottom surface of the supporting cylinder, and a magnet A is placed in the groove; a groove for placing the magnet B is formed in the lower bottom surface of the force guiding piston; the supporting rod can conduct resultant force of vertical vibration generated by axial vibration, horizontal vibration and vertical vibration to the force guiding piston, the force guiding piston drives the magnet B to extrude downwards to generate repulsive force which is gradually increased with the distance space of the magnet A, the repulsive force is used for buffering vertical vibration force conducted by the force guiding piston, and therefore the damping effect is achieved.

The invention discloses an imaging type optical system for a high-intensity magnetic field Fourier infrared spectrum device, which comprises a solenoid superconducting magnet tubular sample cavity for the high-intensity magnetic field Fourier infrared spectrum device, and a non-magnetic damping sleeve arranged in the solenoid superconducting magnet tubular sample cavity, a non-magnetic mirror surface gold-plated optical waveguide is arranged at the upper part in the non-magnetic damping sleeve, a Faraday optical module is arranged at the lower part in the non-magnetic damping sleeve, and an adjustable sample bearing table and a low-temperature thermometer and magnetometer assembly are arranged below the non-magnetic mirror surface gold-plated optical waveguide; the non-magnetic mirror surface gold-plated optical waveguide comprises a light-in waveguide and a light-out waveguide, and the Faraday optical module integrates a switchable reflection module and a transmission module which are respectively adapted to different strong magnetic field Fourier infrared spectrum measurement requirements. The optical efficiency of the high-intensity magnetic field Fourier infrared spectrum device is improved, the problems of high optical loss and scattering interference of a traditional device are solved, and the signal-to-noise ratio is increased.

The invention discloses a bridge electromagnetic inertial mass hybrid control damping system and an overall hybrid control method. The damping system comprises an inertial mass assembly, an electromagnetic assembly, a rigidity assembly and a corresponding parameter adjusting circuit. Wherein the ball screw system is used for converting linear translation into rotation, the inertial mass assembly is used for providing acceleration type inertial mass damping, the electromagnetic assembly is used for providing speed type electromagnetic damping, and the rigidity assembly is used for providing rigidity. In a normal operation stage, a parameter adjusting circuit is utilized, and the purpose of adjusting electromagnetic damping and rigidity values is achieved by changing circuit input, so that semi-active tuning is realized; under the action of an earthquake, circuit input is fixed, so that parameters of the damper are constant, and the anti-seismic robustness of the damper can be improved.

The utility model relates to the technical field of damping equipment, in particular to an electromagnetic damping device adopting a halbach permanent magnet array. The method is specifically applied to civil engineering building damping. Comprising a protective shell, and a spring unit, an electromagnetic damping unit and an inerter mass unit are arranged in the protective shell; the electromagnetic damping unit, the inerter mass unit and the spring unit are located on the left side and the right side of the protective shell respectively. According to the electromagnetic damping device adopting the halbach permanent magnet array, relative movement between the halbach permanent magnet array and a conductor is adopted to generate damping force, a mass flywheel and a spring are connected in combination with a gear rack, and mechanical energy is dissipated by generating huge inertial mass and utilizing reciprocating movement of the spring and generating eddy current damping force. According to the device, the spring unit, the inerter unit and the electromagnetic damping unit can operate together through vibration at any end, mechanical energy is consumed, and the purpose of damping is achieved.

The utility model belongs to the technical field of vibration generators, and relates to a linear vibration motor and electronic equipment, the linear vibration motor comprises a housing, a vibrator assembly accommodated in the housing, and a stator assembly and an electromagnetic damping member which are fixedly connected with the housing and used for driving the vibrator assembly to vibrate; the magnetic circuit system comprises at least two pieces of side magnetic steel and at least one piece of center magnetic steel, the magnetizing directions of the two adjacent pieces of side magnetic steel are opposite and perpendicular to the vibration direction, the center magnetic steel is clamped between the two adjacent pieces of side magnetic steel, and the thickness of the center magnetic steel is smaller than that of the side magnetic steel in the first direction. The center of gravity of the central magnetic steel is closer to the electromagnetic damping piece than the center of gravity of the side magnetic steel, the magnetizing direction of the central magnetic steel is parallel to the vibration direction, and the polarities of the ends, close to each other, of the central magnetic steel and the two adjacent side magnetic steel are the same. The structure not only can improve the electromagnetic damping effect, but also can maintain the magnetic field intensity on one side of the coil.

The invention discloses a magnetic performance dynamic compensation method of a magnetic latching relay suitable for a wide temperature range environment, and relates to the field of magnetic performance dynamic compensation, and the method comprises the steps: obtaining the real-time temperature data and real-time load voltage data of the relay, outputting a basic driving energy parameter, and obtaining the real-time temperature data of the relay based on the real-time temperature data; constructing a three-dimensional rigidity potential energy curved surface dimension reduction solution equivalent rigidity coefficient, predicting mechanical collision kinetic energy at the moment that a movable contact is closed, generating a critical rebound energy threshold value, constructing an ideal convergence track meeting physical deceleration constraint, executing inverse dynamics solution, generating a composite step driving waveform instruction, and performing dynamic deformation on the composite step driving waveform instruction. A relay coil is driven by executing the composite step driving waveform instruction, the motion state vector of a movable iron core is calculated in real time through a flux linkage observer, mechanical rebound is recognized, active magnetic damping adjustment is triggered, the movable iron core is forcibly clamped in a magnetic maintaining balance area, a movable contact can be forcibly locked at a conduction position, and the magnetic field is controlled. And a false pull-in fault is thoroughly avoided.

The utility model provides a yaw electromagnetic damping device and a yaw system of a wind generating set, the yaw electromagnetic damping device comprises: an electromagnet arranged on one of a tower drum and a main frame; the magnetic matching piece is arranged on the other one of the tower drum and the main rack, and the electromagnet and the magnetic matching piece can form magnetic attraction and / or repulsion in a power-on state; the power supply device is electrically connected with the electromagnet and can provide current for the electromagnet; and the control device is in signal connection with the power supply device and can control the output current of the power supply device. According to the yaw electromagnetic damping device provided by the embodiment of the invention, hydraulic oil leakage and dust cannot be generated, and environmental protection is facilitated; the friction plate or the sliding pad does not need to be replaced in the life cycle of the unit, so that the workload of the maintenance personnel is reduced, and the operation and maintenance cost is reduced; damage to the large yaw gear ring and the yaw motor can be reduced, and consumption of spare parts of a unit is reduced.

The invention discloses a vibration measurement and control device of a frame type multilayer vibration isolation platform. The vibration measurement and control device comprises a device body part, a vibration isolation damping part, a quasi-zero stiffness coupling part, an upper functional assembly part, a flexible beam part, a vibration detection part and a control part. The multi-layer strong coupling link of vibration excitation, magnetic damping vibration isolation, the quasi-zero stiffness system, the rotating platform and elastic connection is realized on the same platform, so that the coupling transmission and modal interaction can be conveniently researched.

The invention relates to the technical field of wind power generation control, and discloses a self-adaptive high-power-density permanent magnet motor control method and system, and the method comprises the steps: monitoring a motor current waveform zero crossing point time sequence in real time, and taking the occurrence frequency of a time sequence abnormal event as a recognition basis of a system stress state; when the stress state is identified, d-axis current is instantly injected to form flexible electromagnetic damping, q-axis current output is synchronously limited to reserve safety margin, a current distortion signal is converted from a control error to a system state messenger, response is carried out in a cooperative mode of combining flexible suppression and active protection, and the safety margin is reserved. The problems of overheating and mechanical fatigue accumulation caused by excessive compensation when a traditional control mode deals with disturbance are avoided, the control system obtains the irritability self-protection capacity, and the operation reliability of the wind generating set under the uncertain working condition is improved.

The invention discloses a magnetic pole rotating type electromagnetic damping shimmy damper for a nose landing gear of an aircraft, and belongs to the technical field of vibration control of landing gears of aircrafts. The shimmy damper comprises a first stator disc and a second stator disc which are symmetrically arranged, a rotor disc, a plurality of pairs of permanent magnetic poles, a rotating shaft, a top cover, a base and a bearing. The rotor disc is in interference fit with the rotating shaft through the central square hole, the magnetic poles are circumferentially, uniformly and fixedly arranged on two sides of the rotor disc, and the magnetizing directions of the adjacent magnetic poles are opposite. An adjustable air gap is reserved between the stator disc and the magnetic pole. During working, shimmy motion of the nose landing gear is converted into rotation of the rotating shaft through the transmission mechanism, the rotor disc and the magnetic poles are driven to rotate, the stator disc cuts magnetic induction lines to generate eddy currents, damping torque is formed, kinetic energy is converted into heat energy, and efficient shimmy reduction is achieved. External power supply is not needed, the structure is compact, the weight is light, the problems of abrasion and maintenance of a traditional friction or oil damper are solved, and the damper is particularly suitable for a modern aircraft landing gear system.

The application relates to the technical field of electromagnetic damping, and provides a novel eddy current electromagnetic damper which comprises a cylindrical shell conductor plate (formed by embedding a conductive plate and a magnetic conductive plate), a ring-shaped Halbach permanent magnet array (as a mover), two strip-shaped permanent magnets, a central shaft and an end cover. When the damper is impacted, the mover and the stator move relatively, the conductive plate generates an eddy current, and an eddy current resistance is formed. Meanwhile, repulsion between N poles between the two strip-shaped permanent magnets and the ring-shaped Halbach permanent magnet array generates repulsion force, pushes the ring-shaped Halbach permanent magnet array back to the middle position, and makes the damper reset rapidly. The damper has the advantages of simple structure, low cost and high reliability, and is suitable for large-scale popularization and application.

The invention discloses a high-frequency electromagnetic coupling type damping system and a control method thereof, and relates to the technical field of automobile suspension. A primary coil and a tuning capacitor form a kHz-level LC resonance circuit, a secondary coil or a conductive disc is coupled with the kHz-level LC resonance circuit in a spaced mode, and non-contact suspension supporting is formed between a vehicle body and wheels by means of permanent magnet preloading. The driving frequency is set to be 1-10% above the resonant frequency, the system naturally presents positive stiffness and realizes self-balance, and a sensor closed loop is not needed. Coupling change caused by road excitation induces current on the secondary side, energy can be recycled through the rectifier bridge-DC-DC converter, and electromagnetic damping can also be formed through the adjustable load.

The utility model discloses an electromagnetic damping vibration isolation device belongs to vibration control technical field. The utility model solves the technical problem of the magnetic field intensity fixed of electromagnetic damping vibration isolation device and coil heating easily leads to performance attenuation. The utility model discloses an electromagnetic damping vibration isolation device, including coil subassembly and conductor block. Coil subassembly includes coil and coil clamp. Coil clamp is held in the outer periphery of coil. Coil clamp includes clamp body and water cooling pipeline. The heat dissipation block is equipped on the clamp body, and the heat dissipation block extends along the radial direction of coil, and multiple heat dissipation blocks are evenly arranged around coil. The water cooling pipeline is surrounded in the clamp body. The conductor block is located between at least two groups of coil subassembly, and the magnetic pole of every two groups of coil subassembly is opposite, thereby making the conductor block can be subjected to electromagnetic damping force when producing vibration. The utility model discloses a vibration isolation device can cover the vibration control demand of multiple frequency bands, avoids coil overheat aging, improves the life of vibration isolation device.

The utility model discloses a servo tachometer unit structure with a magnetic damper, and belongs to the technical field of aviation brake structures. Comprising a stator assembly (1), a rotor assembly (2), a damper assembly (3), a damper iron core (4), a pin (5) and a bearing (6). When the servo tachometer unit works, the rotor assembly 2 runs at a high speed, the rotor assembly 2 belongs to a conductor in a magnetic field of the stator assembly, the conductor cuts magnetic induction lines and generates induction current when moving, and the induction current generates ampere force opposite to the original moving direction of the conductor in a magnetic field provided by the damper assembly 3. Deceleration and stable control of the conductor, namely the rotor assembly 2, are realized; when the servo tachometer unit works, the rotor assembly rotates at a high speed, the magnetic damper provides a reverse magnetic field for the rotor assembly, deceleration and stable control over the rotor assembly are achieved, and the servo tachometer unit stops rotating quickly during high-speed work and works more efficiently.

This application relates to a variable pitch controllable magnetic damping oscillating propeller clamp device, including a propeller clamp assembly, a motor assembly, and propeller blades. The propeller clamp assembly includes a propeller clamp seat assembly and an oscillating arm assembly. The oscillating arm assembly includes an inverted U-shaped oscillating arm and two propeller blade mounting seats. An axial connection assembly is provided between the propeller blade mounting seats and the two ends of the inverted U-shaped oscillating arm. A rotation limiting assembly is provided between the two ends of the inverted U-shaped oscillating arm and one end of the axial connection assembly. An electromagnet assembly is provided on the propeller clamp seat assembly, and permanent magnets adapted to the two end faces of the electromagnet assembly are provided at the two ends of the inverted U-shaped oscillating arm. This invention belongs to the field of unmanned aerial vehicle (UAV) technology. It achieves precise adjustment and locking of the propeller blade pitch angle through a gear disk and a limiting mechanism, adapting to different flight requirements and improving control performance. The damping force is directly generated by the magnetic repulsion between the electromagnet and the permanent magnet, without the need for additional mechanical parts, resulting in fast response and more direct damping effect.

The application provides a damping foot pad, a compressor and a refrigeration and heating device. The damping foot pad comprises a shell with an inner cavity, a shaft core, a sheet spring, an eddy current damping mechanism for damping axial vibration of the shaft core, and a magnetic damping mechanism; the magnetic damping mechanism comprises an inner magnetic ring and an outer magnetic ring for generating magnetic repulsion to the inner magnetic ring in the direction of the shaft core. The damping foot pad of the application damps the axial vibration of the shaft core by setting the eddy current damping mechanism, sets the inner magnetic ring on the shaft core, and sets the outer magnetic ring coaxially around the inner magnetic ring. Since the eddy current damping mechanism and the magnetic damping mechanism have very small stiffness close to zero at the start of vibration, quasi-zero stiffness damping is formed, the axial and radial vibration isolation frequency ranges of the damping foot pad are wide, good axial and radial vibration isolation can be achieved, and the vibration isolation effect is good.

The application discloses a double-coil structure electromagnetic damping nonlinear vibration isolator, which comprises a rigid structure and a damping structure matched with each other; the damping structure comprises a top cover, a first left limiting part, a first right limiting part, a first magnetic material, a first coil, a second right limiting part, a base, a second coil, a second left limiting part, a second magnetic material, a base connecting shaft and a part connecting shaft; the first left limiting part, the second left limiting part, the first right limiting part and the second right limiting part are arranged on the base. The nonlinear electromagnetic vibration isolator has the characteristics of damping nonlinearity, adjustable damping and function conversion, and the reliability problem of the ordinary nonlinear vibration isolator under the working condition of low-frequency large amplitude vibration is solved through the damping end, so that the vibration isolator has a better vibration isolation effect under the low-frequency working condition.

The utility model relates to the technical field of anti-vibration, and discloses a high-damping anti-vibration seat of integrated circuit equipment, which comprises an anti-vibration seat and a base. According to the high-damping anti-vibration seat of the integrated circuit equipment, through the arrangement of the supporting seat, the base, the damping mechanism and the elastic mechanism, when the integrated circuit equipment is vibrated, the acting force borne by the supporting seat can be transmitted to the piston rod, the piston rod is forced to vibrate, and magnetorheological fluid is pushed to flow in the annular cavity; a magnetic field generated by the permanent magnet array enables magnetorheological fluid particles to form a chain-shaped structure, fluid shear stress is greatly increased, nonlinear viscous resistance is generated, meanwhile, vertical reciprocating motion of the piston rod cuts magnetic induction lines of the permanent magnet array, an eddy current effect is triggered, reverse electromagnetic damping force is generated, and the damping effect is improved. Therefore, magnetic circuit cutting and fluid extrusion are achieved while movement of the piston rod is achieved, a composite energy dissipation mechanism of electromagnetic damping and viscous damping is formed, and the energy dissipation efficiency and the resonance peak suppression efficiency are remarkably improved.

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 utility model discloses a magnetic damping mouse wheel which comprises a bottom plate. The roller bracket is arranged on the bottom plate; the roller assembly is movably mounted on the roller bracket; the roller assembly comprises a roller and permanent magnets, a plurality of mounting grooves are formed in the circumferential surface of the roller, each permanent magnet is arranged in the corresponding mounting groove, and the outward surfaces of the permanent magnets have the same polarity; the opposite-attraction magnet is arranged on the bottom plate and located under the roller assembly, and the opposite polarity of the opposite-attraction magnet is opposite to that of the permanent magnet; a Hall sensor is further arranged on the bottom plate and located on the side opposite to the opposite attraction magnet. When the roller assembly rotates, magnetic damping force is generated by the magnetic attraction force between the permanent magnet and the attraction magnet, the magnetic damping force forms damping force for rotation of the roller assembly, a user feels the damping effect through changes of the magnetic attraction force between the permanent magnet and the attraction magnet in the using process, and the user experience is good; and meanwhile, the rotating angle of the roller can be accurately sensed through the Hall sensor, and actual use is facilitated.

The application provides a low eddy current preloading structure for a magnetic preloading system and relates to the technical field of precision motion platforms. A preloading body is arranged opposite a magnet, and the preloading body and the magnet have relative movement during work. The preloading body is formed by alternately stacking a plurality of magnetic conductive layers and a plurality of insulating layers, and is used for segmenting and limiting an eddy current loop induced by the relative movement, so that the magnetic damping force of the preloading body in the relative movement direction is reduced without significantly reducing the magnetic preloading force. According to the technical scheme, the structure of the preloading body is designed, and the insulating layer effectively limits the expansion of the eddy current in the direction, so that the large-scale eddy current which may originally penetrate the whole body is segmented and limited in a single magnetic conductive layer or a local area thereof, that is, the eddy current path in the preloading body is blocked or separated by a physical method, so that the magnetic damping force caused by the eddy current is greatly reduced under the premise of maintaining the magnetic preloading force, and finally the dynamic performance and the static stiffness of the air floating motion platform are simultaneously improved.

The application relates to an electromagnetic damping vibration damper, which comprises a wire clamp, a sleeve, permanent magnet hammers and springs. One end of the sleeve is fixedly connected with the wire clamp, the inside of the sleeve is provided with a buffer cavity, and the inner wall of the buffer cavity is entirely covered with an eddy current copper plate. The permanent magnet hammers are arranged in the buffer cavity along the axial direction of the sleeve, the permanent magnet hammers can slide along the axial direction of the sleeve, and a working gap is arranged between the permanent magnet hammers and the eddy current copper plate. One end of the spring is fixedly connected with the permanent magnet hammer, and the other end is fixedly connected with the permanent magnet hammer or the end of the buffer cavity. Four permanent magnet hammers and two adjacent springs are matched to form four groups of electromagnetic energy dissipation units, the natural frequencies of the four groups of electromagnetic energy dissipation units are F1, F2, F3 and F4, and the damping ratio of the four groups of electromagnetic energy dissipation units is between 0 and 1. Each group of electromagnetic energy dissipation units corresponds to an independent natural frequency, four discrete resonance frequency points are formed, and the core frequency band 0-150Hz of the overhead transmission line wind vibration is covered.

The invention discloses a dynamic damping seat. The dynamic damping seat comprises a base body and a seat face assembly. The seat surface assembly comprises a seat surface main body, a seat plate and a damping mechanism; and the seat plate is fixed on the base main body. And the seat surface main body is connected with the seat plate through a damping mechanism. And the damping mechanism comprises a damping unit arranged between the seat surface main body and the seat plate. Each damping unit comprises an outer base, an inner base, a copper sheet, a magnetic damping assembly and an elastic damping assembly. And the outer seat and the inner seat are respectively fixed on the seat plate and the seat surface main body. The inner base is in sliding fit with the outer base. The magnetic damping assembly is arranged between the inner seat and the outer seat, so that a moving magnetic field can be generated when the inner seat is pressed to move. Meanwhile, a copper sheet is arranged on the outer seat. Magnetic induction lines in a moving magnetic field are cut through the copper sheet, an induced magnetic field opposite to the original magnetic field in direction is generated, movement of the inner seat is hindered, the higher the movement speed of the inner seat is, the larger the generated induced magnetic field is, the larger the hindering force is, and then dynamic damping is formed.

The utility model discloses a small self-rotating magnetic damping sprayer which comprises a tailstock and a sprayer body. A plurality of eccentric and inclined nozzle holes are formed in the side wall of the spray head body; a small threaded hole, a cylindrical hole and a large threaded hole are sequentially formed in the center of the tailstock from front to back. The rear end of the mandrel penetrates through a through hole preset in the center of the spray head body and is in threaded connection with the small threaded hole; a sleeve part is arranged at the rear end of the spray head body, a red copper sleeve is in interference connection with the inner wall of the sleeve part, a plurality of magnet blocks which are uniformly distributed on the circumference are fixedly connected with the outer wall of the front part of the tailstock, and the polarities of every two adjacent magnet blocks are opposite; a gap is reserved between the magnet block and the red copper sleeve; and the outer diameter of the spray head body is smaller than or equal to that of the tailstock. The high-pressure water washing nozzle is not provided with a bearing, utilizes water film lubrication, is provided with a magnetic damping structure, prevents the rotating speed of the nozzle body from being too high, prolongs the service life, improves the reliability, and is compact in structure, and the outer diameter of the tailstock can be smaller than 30mm, so that the high-pressure water washing nozzle is suitable for high-pressure water washing of small-diameter pipelines.

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

According to the built-in coupling damper of the offshore wind power pile foundation, electromagnetic eddy current damping and hydrodynamic force damping are combined, a magnetic mass block moves in a magnetic field of a permanent magnet retainer to generate eddy current heat dissipation, meanwhile, a turbulent flow mass block is driven by tide in seawater in a pile to form additional fluid damping, and therefore the damping effect is improved. And dual conversion from vibration energy to heat energy and kinetic energy is realized. Compared with a traditional viscous oil cylinder damper, when the wave frequency is close to the structure frequency, the vibration amplitude can be reduced, and accumulation of the wave limit load and the fatigue load is remarkably relieved. Through dynamic coupling of the magnetic damping unit and the fluid mass block, a mass-spring-damping system is formed, low-frequency shaking of a fan tower and high-frequency vibration of a pile foundation are effectively restrained, and the device is suitable for the complex load environment brought by offshore wind power large-scale and deepwater.

The application discloses a variable stiffness and damping automobile self-tuning electromagnetic suspension, which comprises a stator shell, end covers fixedly connected to both ends of the stator shell and a mover inner core; the mover inner core is movably installed in the stator shell, two groups of coils are arranged on the mover inner core, and a plurality of tooth-shaped structures are arranged on the stator shell and the mover inner core on the left and right sides of each group of coils; a conductive copper ring is arranged at the inner wall of the stator shell on the side of one group of coils; linear bearings and supporting springs are sleeved on both ends of the mover inner core; one end of the supporting spring is fixed to the end cover, and the other end is directed to the shaft shoulder of the mover inner core; the end of the mover inner core on the side of the conductive copper ring is led out from the same side end cover and connected with a knuckle bearing, and the end cover on the other side is connected with the knuckle bearing. The application introduces two groups of electromagnetic coils to control the magnetic field intensity of electromagnetic springs and electromagnetic dampers, so that the stiffness and damping of the shock absorber can be independently tuned.

The invention relates to the technical field of motor testing, in particular to a durability testing device for a permanent magnet type stepping motor, which comprises a testing machine, a driving piece, a piece to be tested, an electrical sensor and a grounding wire, the device is characterized by further comprising an electric measurement shielding shell, an electric isolation signal transmission shaft, a fixed plate, a bidirectional cam, an electromagnetic isolation assembly, an electric measurement signal transmission connection assembly and an electromagnetic damping type current discharge assembly, wherein the electric measurement shielding shell is fixed in the testing machine; according to the invention, the electric measurement shielding housing, the electric isolation signal transmission shaft, the bidirectional cam, the electromagnetic isolation assembly, the electric measurement signal transmission connection assembly and the electromagnetic damping type current discharge assembly cooperate with each other; the problem of test result distortion caused by thermal attenuation, electrocorrosion and electromagnetic interference in the permanent magnet type stepping motor durability test in the prior art is solved, and the permanent magnet type stepping motor durability test device has the remarkable advantages of high precision, high reliability and long service life test.

The application relates to the field of aerospace technology, in particular to a passive and active integrated magnetic suspension five-super-load platform based on a parallel mechanism. The passive and active integrated magnetic suspension five-super-load platform comprises a parallel mechanism frame and a magnetic suspension super platform which are connected with each other, the parallel mechanism frame is further connected with a satellite body, and the magnetic suspension super platform is further connected with a load; the parallel mechanism frame comprises a plurality of branch chains and is used for providing attitude maneuvering capability for the magnetic suspension super platform; the magnetic suspension super platform comprises a magnetic suspension vibration isolator, a voice coil motor, a magnetic suspension moving platform and magnetic damping; the magnetic suspension moving platform is used for mounting the load; the voice coil motor is connected with the magnetic suspension moving platform and the parallel mechanism frame respectively, and is used for providing active adjustment of the magnetic suspension moving platform; and the magnetic suspension vibration isolator is used for reducing vibration in the moving process. When the attitude is not actively adjusted and the vibration is not actively inhibited, the magnetic suspension of the load and the platform can be maintained by less control, the transmission of the vibration can be physically blocked, and therefore energy consumption is saved.

This invention relates to the field of ventilation system technology, specifically to an energy-saving ventilation system for prefabricated buildings. The system includes a wind duct and a fan fixed at the duct's port. Air guide plates are rotatably mounted on both sides of the wind duct. An air-guiding component is located near the outer side of each air guide plate to generate thrust when wind conditions are suitable. The air-guiding component includes a connecting frame fixedly mounted on the outer side of the air guide plate, and a rotating frame is fixedly connected to the connecting frame. By using the air-guiding component, when natural wind conditions are sufficient, natural wind can be guided into the wind duct to ventilate the building. Natural wind is used to replace or partially replace the wind generated by the fan, allowing for proactive fan shutdown and achieving energy savings. Simultaneously, the magnetic damping generated between the metal slider and the strong magnet helps stabilize the movement of the rotating plate, assisting in the stable entry of wind into the wind duct.