93 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 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 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 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.

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 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 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 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.

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.

The invention discloses a linear vibration motor and electronic equipment, and relates to the technical field of vibration generators, the linear vibration motor comprises a shell, a stator assembly and a vibrator assembly, the stator assembly and the vibrator assembly are accommodated in the shell, the vibrator assembly is suspended in the shell, the vibrator assembly comprises a mass block and a magnetic circuit assembly, the stator assembly comprises a coil, an iron core and an electromagnetic damping piece, the stator assembly is at least partially located in the containing cavity of the mass block, the iron core comprises a main body part and two end parts arranged at the two ends of the main body part in the vibration direction of the vibrator assembly, the projection area of the two end parts in the vibration direction of the vibrator assembly is larger than the projection area of the main body part, and the coil is wound around the main body part and located between the two end parts. The side surface of the iron core facing the magnetic circuit assembly is provided with an electromagnetic damping member. Foam damping is replaced by electromagnetic damping, the time for designing foam is saved, the design efficiency is improved, meanwhile, compared with a traditional electromagnetic damping position scheme, the motor space is saved, the damping effect is improved, and the product competitiveness can be greatly improved.

The utility model discloses an adjustable permanent magnet damper, and belongs to the technical field of permanent magnet brakes, and the permanent magnet damper comprises a housing, main shafts which are respectively fixed at two ends of the housing, and main shafts which are rotatably connected in the housing and on two end covers and penetrate through the two end covers; the magnetic piece is arranged in the shell, corresponds to the outer side of the main shaft and is used for generating a magnetic field; the sliding sleeve axially moves in the shell; the magnetic sleeve is fixedly arranged on the inner side of the sliding sleeve and located on one side of the outer portions of the multiple magnetic parts, and the adjusting assembly is arranged on the shell and the end cover, connected with the sliding sleeve and used for driving the sliding sleeve to move and adjusting the length of the magnetic sleeve covering the outer sides of the magnetic parts. According to the adjustable permanent magnet damper, the position of the sliding sleeve is changed through the adjusting assembly, and then the length of the part, covering the outer side of the magnetic piece, of the magnetic sleeve is adjusted, so that stepless adjustment from the minimum damping torque to the maximum damping torque can be achieved, and various requirements for torque under different working conditions are met.

The present application belongs to the technical field of motor testing, and discloses a micro-torque motor power testing system and testing method, wherein the testing system comprises a support, an adjusting screw, a permanent magnet disc, a magnetic hysteresis disc, an output shaft, a torque calibration disc and a torque measuring device; the adjusting screw is erected on the support, one end of the adjusting screw is a handle, and the other end is the permanent magnet disc; the output shaft is erected on the support, one end of the output shaft extends out of the support and is detachably connected with the torque calibration disc, and the other end of the output shaft is the magnetic hysteresis disc; the disc surface of the permanent magnet disc is opposite to the disc surface of the magnetic hysteresis disc, the permanent magnet disc is provided with alternately distributed permanent magnets, and the magnetic hysteresis disc is made of magnetic damping material; and the torque measuring device is connected with and measures the rotating torque of the torque calibration disc. The present application solves the problem that the torque of a motor is difficult to balance the dynamic friction force generated by a rope when the testing torque is small, has high testing precision, and the overall investment is only 5% of the imported equipment, thereby greatly reducing the testing cost.

The application discloses a self-adaptive magnetic damping mechanism, a damping method and application of the self-adaptive magnetic damping mechanism and the damping method in a fan, relates to the technical field of fan damping devices, and comprises fixedly arranged magnetic annular grooves, multiple groups of telescopic counterweight strip assemblies integrated in fan blades and a control module, multiple groups of permanent magnets are symmetrically arranged on the two side walls of the magnetic annular grooves, and a gradually enhanced magnetic field is formed along the groove depth direction by reducing the magnet spacing, the telescopic counterweight strip assembly comprises a counterweight strip, end magnets are arranged at the ends of the counterweight strip and the end magnets are arranged to extend into the magnetic annular grooves to generate repulsion, and the control module dynamically adjusts the position of the counterweight strip based on the real-time rotating speed of the fan and a reference mapping relationship between the rotating speed of the fan and a target position of the counterweight strip, so as to adjust the mass distribution and the magnetic support stiffness of the fan blade, and the low-energy-consumption high responsiveness of fan low-speed start-stop and the vibration stability of high-speed operation are realized.

The invention relates to the field of magnetic shock absorbers, and discloses a magnetic shock absorber suitable for large equipment, which comprises a base, a lower shell is fixedly mounted at the top end of the base, an upper shell is arranged on the inner side of the lower shell, and a magnetic shock absorption assembly is arranged between the lower shell and the upper shell. The magnetic vibration reduction assembly comprises a lower neodymium magnet fixedly installed on the inner bottom wall of the lower shell, a bottom energy harvesting device is arranged below the lower neodymium magnet, a bottom installation groove is formed in the bottom end of the upper shell, an upper neodymium magnet is installed in the bottom installation groove, a bottom cover plate is arranged below the upper neodymium magnet, and the bottom cover plate is fixedly connected with the upper shell through bolts. Repulsive force exists between the lower neodymium magnet in the lower shell and the upper neodymium magnet at the bottom of the upper shell, vibration reduction is conducted through magnetic force while equipment is supported, a non-contact suspension structure is designed on the basis of the principle that opposite poles of the neodymium magnets repel, a solid vibration propagation path is thoroughly blocked, mechanical abrasion is reduced, and the service life is prolonged.

The application discloses a magnetic damping high-speed optical wheel and relates to the technical field of mice. The magnetic damping high-speed optical wheel comprises a PCBA plate, a middle key, a left swing key and a right swing key arranged on the PCBA plate, a support is arranged on the surface of the PCBA plate through a PCB plate, an optical sensing component electrically connected with the PCBA plate is arranged in the support, a light hole is arranged in a magnetic outer shaft, the light holes are uniformly distributed in a circle, IR / PT sides are separated, if the initial state is open, one tooth rotation is closed, if the initial state is closed, one tooth rotation is open, and continuous rotation enters the next cycle. The pressing part, the shaft sleeve, the first magnetic tooth and the second magnetic tooth are uniformly arranged in the shaft sleeve, and the magnetic outer shaft is driven to rotate in the process. When the first magnetic tooth corresponds to the second magnetic tooth, the attraction between the first magnetic tooth and the second magnetic tooth is the strongest. With the first magnetic tooth and the second magnetic tooth staggered, the attraction gradually weakens. The first magnetic tooth and the second magnetic tooth are both arranged as 24, one circle rotation is 24 grids, and each grid has one paragraph feeling.

The invention discloses an automobile forecabin storage box with a vibration reduction function, and belongs to the technical field of automobile parts, the automobile forecabin storage box comprises a forecabin decoration cover, a storage box placing groove, a storage box body and a storage box pad; a storage box placing groove is formed in the front cabin decoration cover; a storage box body is placed in the storage box placing groove; an elastic assembly is arranged at the bottom end of the storage box body, and the storage box body is connected with a supporting plate through the elastic assembly. The storage box pad is placed on the supporting plate through a positioning structure; a magnetic damping assembly is arranged between the bottom end of the supporting plate and the bottom end of the storage box body. The problem that an existing storage box is insufficient in vibration reduction performance is solved.

The utility model discloses a straight pull type magnetic damping twisting machine which comprises a static part for supporting a yarn cylinder and a rotating part for twisting yarns, the static part comprises a static base, a guide rod and a conductor disc are arranged on the upper side of the static base, the yarn cylinder and the conductor disc are connected and arranged outside the guide rod in a sleeving mode, and the edge of the conductor disc is located between two attraction magnetic poles. The edge of the conductor disc (made of aluminum and copper) cuts magnetic induction lines of a static magnetic field between attracted magnetic poles, reverse damping force is generated, the yarn bobbin rotates along with the yarn under the traction effect, the yarn is subjected to balanced stretching and tension, when power is cut off for stopping and traction of external power is lost, rotation with the damping force larger than inertia achieves immediate braking, and therefore the yarn bobbin is prevented from being damaged. The problems of yarn slipping and yarn entangling caused by inertia rotation are avoided, and the requirements of different yarn materials, diameters and twist degrees for tension are effectively met through magnetic damping force.

The application provides an electromagnetic damper type self-powered active / semi-active vibration reduction system and a method thereof, comprising a linear-rotation conversion device, an energy conversion device and a load, wherein the linear-rotation conversion device adopts a gear rack or a ball screw; the energy conversion device adopts a permanent magnet synchronous motor; the load is configured as a three-phase voltage type PWM rectifier and a battery; when the system works in an active mode, motor control force is solved by rolling optimization in a model predictive controller according to detected structural displacement, speed, voltage and current feedback information; when the system works in a semi-active mode, analog inertia force, stiffness force and damping force are calculated according to feedback signals, each bridge arm of the three-phase voltage type PWM rectifier is turned on and turned off to realize control of the motor, vibration is suppressed, and the energy of the vibration is recovered to the battery.

The invention discloses a magnetic field adjustable spin wave excitation mode and magnetic damping magnetic material and a preparation method and application thereof. The magnetic material is Co1. 8Fe1Si1, and the crystal structure of the magnetic material is A2 or B2. The effective magnetic damping of the material is remarkably adjustable in an external magnetic field of 600-6600 Oe, and the maximum change range is 49.1 * 10 <-3 >-8.6 * 10 <-3 >; meanwhile, the number of spin wave excitation modes is increased from 3 to 5, and an MSSW mode, a Killion mode and a 1 / 2 / 3-order PSSW mode can be excited at the same time at most. The material is obtained by sequentially depositing a buffer layer and a Co1. 8Fe1Si1 alloy film on a substrate through vacuum magnetron sputtering and carrying out vacuum annealing. The magnetic material disclosed by the invention has an important application prospect in the field of reconfigurable spin electronic devices due to a spin wave excitation mode with an adjustable magnetic field and a magnetic damping characteristic.

The invention discloses a variable-damping fabricated three-dimensional shock isolation device and method. The variable-damping fabricated three-dimensional shock isolation device comprises a bearing plate assembly, a three-dimensional shock isolation assembly and a base assembly which are sequentially arranged from top to bottom. The three-dimensional shock insulation assembly comprises an upper-layer sliding system, a vertical shock insulation damping unit and a lower-layer sliding system; the upper-layer sliding system comprises a first sliding rail and a first sliding block, and the first sliding rail is connected with the bearing plate assembly; the lower-layer sliding system comprises a second sliding rail and a second sliding block, and the second sliding rail is connected with the base assembly; the vertical shock insulation assembly unit is connected between the first sliding block and the second sliding block and comprises a pre-pressed belleville spring. Wherein the two ends of the first sliding rail are provided with first magnetic baffles, and the first sliding block is provided with a material repulsive to the first magnetic baffles in magnetism; and / or second magnetic baffles are arranged at the two ends of the second sliding rail, and the second sliding block is provided with a material which is repulsive to the second magnetic baffles in magnetism. By integrating the variable magnetic damping mechanism and the pre-pressed belleville spring, self-adaptive shock insulation and efficient energy consumption under horizontal and vertical seismic excitation are achieved.

The invention relates to the technical field of relief printing, and discloses a relief printing device. A relief printing machine; the paper roll roller is used for storing paper rolls; the functional roller is used for guiding, flattening and destressing the paper; the two self-adaptive adjusters are symmetrically arranged in the relief printing machine, each self-adaptive adjuster comprises a sliding part and a bearing seat sliding on the sliding part all the time, and further comprises an energy storage winder for pulling the bearing seat and a damping adjusting part, the damping adjusting part is arranged on the side edge of the energy storage winder, and the damping adjusting part is arranged on the side edge of the energy storage winder. The damping adjusting part comprises a magnetic damping fork with an adjusting stroke, and the magnetic damping fork can adjust an action position relative to an aluminum disc rotating in the energy storage winder. Aiming at a unique intermittent feeding unwinding system of the relief printing machine, jumping possibly generated in the moving process of paper is restrained by arranging a displaceable self-adaptive stress roller.

A transverse magnetic field configuration optical system for a high magnetic field Fourier transform infrared (HFT) spectrometer includes a tubular sample cavity containing a solenoid superconducting magnet for the HFT spectrometer, and a non-magnetic damping sleeve housed within the tubular sample cavity. The upper part of the non-magnetic damping sleeve houses a non-magnetic mirror-plated gold-coated optical waveguide, and the lower part houses a transverse magnetic field configuration optical module. The transverse magnetic field configuration optical module contains an adjustable sample support stage, which is connected to a decelerated stepper motor outside the transverse magnetic field configuration optical system. The non-magnetic mirror-plated gold-coated optical waveguide includes an input waveguide for the probe light and an output waveguide for the signal light. The transverse magnetic field configuration optical module comprises a transverse magnetic field configuration reflection module and a transverse magnetic field configuration transmission module, respectively adapted to different HFT Fourier transform infrared spectroscopy measurement requirements. This invention proposes an optical system capable of realizing transverse magnetic field configuration magnetic spectroscopy measurements.

The application discloses a multi-reference calibration type magnetic damping friction tester, which is characterized by comprising a main body assembly, a leveling assembly and an angle measuring assembly, wherein the leveling assembly is arranged on the bottom surface of the base of the main body assembly, the angle measuring assembly is arranged on the top surface of the base of the main body assembly, the main body assembly is used for realizing device main body support, slope adjustment and experimental component installation, the leveling assembly is used for horizontally adjusting the base, and the angle measuring assembly is used for indicating and reading the inclination angle of the slope experimental rod.