119 results about "Magnetorheological elastomer" patented technology

The invention relates to the technical field of excavator bucket rods, and provides a bucket rod composite damping device and an excavator. The device comprises a shell composed of a base, an outer shell and a stress shell; the magneto-rheological buffer device is installed in the shell and composed of a lattice structure made of magneto-rheological elastomer materials and magneto-rheological fluid filled in gaps corresponding to the lattice structure, and a plurality of sound absorption holes are formed in each cell element wall in the lattice structure; the electromagnetic device is located in a containing cavity formed in the lattice structure and is composed of a magnetic core and an electromagnetic coil; the anti-vibration pad and the stress plate are embedded in the top of the shell and are in contact with the stress plate; the damping springs are arranged on the periphery of the shell and fixedly connected between the stress plate and the base; the vibration monitoring module is used for collecting vibration data of the bucket rod in real time and transmitting the vibration data to the intelligent control module, and the intelligent control module is used for adjusting the output magnetic field intensity of the electromagnetic coil according to the vibration data so as to adjust the viscosity of the magnetorheological fluid in real time.

The invention relates to the technical field of robot intelligent actuators, and discloses a magneto-rheological end effector accurate grasping system based on force feedback, which comprises a multi-curved-surface bionic fingertip formed by a magneto-rheological elastomer, and a three-dimensional distributed excitation coil array is embedded in the fingertip. The coil array is excited by a high-frequency chopping constant-current driving module to generate a space gradient magnetic field, and the magnetic field changes the shear modulus of the elastomer within millisecond-level time, so that the fingertip surface hardness jumps in real time along with a control instruction; and the force feedback closed-loop control unit comprises an ultrathin film strain sensing net attached to the inner curved surface of the fingertip. Through time-sharing switching of a negative pressure micropore adsorption layer and a magneto-rheological rigidity keeping mode, traditional adsorption and rigid clamping are changed into a pre-fixing and rigidity gradual change two-section type process, instantaneous force impact during adsorption release is eliminated, meanwhile, thin film wrinkling caused by continuous negative pressure is avoided, and it is ensured that an ultrathin and high-added-value workpiece is kept flat and traceless in the whole transfer process.

This invention discloses a magnetorheological vibration isolator with negative stiffness characteristics, comprising a magnetorheological elastomer (MRE), an iron sheet, a circular magnet, a cylindrical central shaft, an electromagnetic coil, upper and lower base plates, an outer sleeve, and a bar magnet. The MRE, iron sheet, and circular magnet form a multi-layered MRE structure, with the circular magnet providing a portion of the initial magnetic field to the MRE. The electromagnetic coil, located between the multi-layered MRE structure and the outer sleeve, can control the magnetic field strength acting on the MRE in real time, thereby controlling the stiffness and damping of the MRE isolator. The bar magnet and magnet brackets form a negative stiffness generating unit, respectively installed on both symmetrical sides of the isolator. This invention introduces negative stiffness characteristics into a semi-active vibration isolator, improving the vibration reduction effect of semi-active control to the level of active control, while also offering good stability and low system cost. This invention can be applied to lateral vibration control in high-speed trains, improving stability and safety during high-speed operation, and has broad application prospects.

The self-adaptive anti-centrifugal chuck comprises a chuck body and clamping jaws, T-shaped sliding blocks matched with T-shaped sliding grooves of the chuck body are machined on the bottom faces of the clamping jaws, threaded holes are formed in the clamping jaws, bearing frames are installed at the two ends of the T-shaped sliding grooves of the chuck body through bolts, and lead screws matched with the threaded holes are installed on the bearing frames through bearings. A notch is formed in one end of the lead screw and used for being driven by a hand or a tool to rotate, a magneto-rheological elastomer layer is arranged on the bottom face of the T-shaped sliding groove, and an embedding groove provided with an electromagnet is formed below the bottom of the chuck. A clamping force sensor is embedded in the clamping face of the clamping jaw, vibration sensors are evenly distributed on the upper surface of the chuck, a piezoelectric ceramic layer is arranged above or below the magnetorheological elastomer layer, the rigidity of the magnetorheological elastomer layer is adjusted through an electromagnet to compensate centrifugal force, the piezoelectric ceramic layer compensates vibration displacement, and the clamping force sensor feeds back clamping force in real time. And self-adaptive centrifugal and vibration interference resistant accurate clamping is achieved.

The invention belongs to the technical field of material conveying, and particularly relates to a magneto-rheological elastomer vibration conveying screen which comprises a rack and a screen bed, the screen bed is of a four-layer composite structure design, and the upper layer is a working face composed of a plurality of independent rigid beams; the second layer is an organ plate sealing lattice filled with a magnetorheological elastomer; the third layer is a sealing layer; the bottom layer is an electromagnet matrix layer. The control system collects material state data in real time through the sensor, dynamically adjusts working parameters of the electromagnet after analysis and processing, controls rigidity changes of the magnetorheological elastomer, and achieves self-adaptive conveying of materials. The equipment supports three working modes: in the traveling wave conveying mode, propelling waves are formed through phase control, so that the conveying efficiency is improved; the whole oscillation starting mode realizes uniform vibration, and the conveying stability is ensured; and material deviation is automatically corrected in a differential deviation correction mode, so that the operation reliability is ensured. The conveying efficiency and the material protection are optimally balanced, the material breakage rate is reduced, and the equipment adaptability and the intelligent level are improved.

The application discloses an eddy current negative stiffness magneto-rheological elastomer vibration isolator, which comprises an eddy current damping structure and a negative stiffness magneto-rheological elastomer structure, wherein the eddy current damping structure comprises a U-shaped permanent magnet and a conductor, and the U-shaped permanent magnet and the conductor are annular; the bottom of the U-shaped permanent magnet is mounted on a bottom plate; the top of the conductor is connected with a top plate, and the bottom of the conductor is mounted in the U-shaped permanent magnet to move in a cutting magnetic induction line mode; the bottom plate and the top plate are respectively mounted on a vibration source and a vibration-isolated structure; one end of the negative stiffness magneto-rheological elastomer structure is arranged in an annular inner ring of the U-shaped permanent magnet and connected with the bottom plate; and the other end of the negative stiffness magneto-rheological elastomer structure is arranged in an annular inner ring of the conductor and connected with the top plate. The application can reduce the amplitude of the vibration isolation system when passing through a resonance region, improve the relative vibration isolation effect, and prevent the vibration isolation system structure from being adversely affected due to resonance.

The invention discloses a hardness self-adaptive adjustment high-voltage insulation shielding cover which comprises a composite insulation cover body, the composite insulation cover body sequentially comprises an outer insulation layer, a middle magnetorheological elastomer interlayer and an inner attaching layer from outside to inside, and a miniature electric field sensor is embedded in the surface of the outer insulation layer and used for monitoring the intensity of a surrounding electric field in real time; the flexible electromagnetic coil is embedded in the middle magnetorheological elastomer interlayer; the intelligent induction energy storage module is integrated in a lightweight waterproof box at the top of the composite insulation cover body and comprises a magnetic field controller, a micro super capacitor, an electric field signal processor and a pressure signal converter, and the magnetic field controller is connected with the flexible electromagnetic coil through a wire; through the three-layer structure design of the composite insulation cover body and corresponding material selection, double guarantee of insulation protection and self-adaptive fitting is realized.

The invention belongs to the technical field of bridge steel shell hoisting construction, and particularly relates to a fine adjustment device suitable for stability of a gravity center changing curve type steel shell, the fine adjustment device comprises a steel shell, mounting angle blocks are symmetrically arranged on the side face of the upper end of the steel shell, and an adjusting mechanism is arranged at the upper end of each mounting angle block. According to the fine adjustment device, a flexible adjustment structure composed of the magnetorheological elastomer and the electromagnetic coil is arranged, and a steel cable traction adjustment mechanism driven by the hydraulic motor is combined, so that bidirectional precise regulation and control over the stability of the steel shell are achieved, and the shear modulus of the magnetorheological elastomer can be linearly regulated and controlled through the current of the electromagnetic coil; the stress change caused by gravity center shift can be quickly responded, and the dynamic unbalance force can be counteracted in real time.

The present invention discloses an incremental forming device and method based on magnetorheological elastomer auxiliary support, comprising a forming tool head, a clamping plate, a magnetorheological elastomer support, a magnetic field generating unit and its controller, and a detachable base mold. The base mold houses the magnetorheological elastomer support, and after the plate is clamped, it is tightly attached to the surface of the magnetorheological elastomer support. The base mold is provided with multiple cylindrical slots around its periphery for accommodating the magnetic field generating unit for exerting an effect on the magnetorheological elastomer. Under the control of the controller, the magnetic field generating unit changes the magnetic field and thereby changes the shear modulus of the magnetorheological elastomer support, thereby supporting the bottom surface of the formed plate. The present invention proposes a method for improving the forming accuracy of incrementally formed workpieces using a magnetorheological elastomer support. Specifically, the magnetorheological elastomer exerts a supporting force on the bottom of the plate, thereby reducing the rebound and associated deformation of the formed part and improving the forming performance of the part.

The invention discloses a machining device for a complex curved surface safety filter screen of an aircraft hydraulic system, and relates to the technical field of aerospace non-traditional machining equipment.The machining device comprises a phase transformation chuck assembly, the working surface of the phase transformation chuck assembly is composed of a magneto-rheological elastomer, and the magneto-rheological elastomer can be in a flexible state when no magnetic field exists; and when a magnetic field is applied, a rigid state is presented. By utilizing the field-induced phase change characteristic of the magneto-rheological elastomer, the magneto-rheological elastomer can be used as a flexible shaping device to copy the accurate negative shape of the mounting base without stress, and can also be used as a rigid clamp to firmly maintain the shape, so that the assembly error caused by inconsistent reference in the traditional processing is eliminated. And the stress deformation in the machining process of the thin-wall workpiece is greatly inhibited by integrating a resonant stripping machining structure and utilizing a micro stripping effect generated by high-frequency micro-amplitude vibration of the ultrasonic tool bit. And through cooperative control, a whole-process closed-loop manufacturing normal form is formed. And the machining precision and the machining consistency are improved.

This invention relates to the field of vibration control technology for civil engineering structures. It discloses a triaxial magnetorheological quasi-zero stiffness intelligent vibration isolation bearing for large-span spatial structures and its control method. The bearing includes a top plate and a bottom plate. A middle plate is fixed to the bottom of the horizontally stacked magnetorheological elastomer vibration isolation / vibration unit. A vertical magnetorheological quasi-zero stiffness vibration isolation / vibration unit is fixed to the bottom plate and slidably connected to the inner side of the middle plate. The control method uses sensors to collect the structural response in real time, identifying three operating conditions: high-frequency micro-vibration, low-frequency moderate vibration, and large earthquake safety. It automatically switches control modes to achieve coordinated adaptive control of vertical damping and horizontal stiffness and damping. This invention combines high static load-bearing capacity with low dynamic stiffness, enabling triaxial decoupling and multi-mode intelligent coordinated control, and is suitable for broadband vibration control of roof supports for large-span spatial structures.

The application relates to a robot milling semi-active vibration suppression end effector and a control method based on an MRF-MRE hybrid medium, which comprises a hybrid medium system constructed in parallel with a magneto-rheological fluid and a magneto-rheological elastomer, controllable energy dissipation damping provided by the MRF filled in a shearing gap, variable dynamic stiffness provided by the MRE as a supporting element, tracking adjustment of an inherent frequency and independent suppression of a vibration amplitude realized through differential or common-mode magnetic fields generated by double excitation coils, and a heat-magnetic compensation mechanism based on impedance monitoring of the excitation coils, which effectively solves the performance drift problem in long-time machining. The end effector adopts a non-rotating design, the mover assembly is radially vibrated with the cutter but not rotated with the cutter through the antifriction bushing, and the reliability and sealing life in the high-speed milling working condition are remarkably improved.

The present invention discloses a ballastless track vibration reduction structure that integrates induction power generation and frequency modulation vibration reduction, belonging to the technical field of rail transit. The track plate and base plate of the present invention are laid longitudinally along the track line, with the track plate located above the base plate; an adjustment layer is arranged between the track plate and the base plate; an elastic vibration reduction layer is provided between the base plate and the piezoelectric device layer, and the elastic vibration reduction layer is filled in a limiting structure within the base plate; a silicon steel sheet iron core structure of an electromagnetic coil is provided within the elastic vibration reduction layer located in the limiting structure; the piezoelectric device layer is located between the adjustment layer and the base plate, and the piezoelectric device layer is connected to the electromagnetic coil via a wire. The present invention utilizes piezoelectric materials and magnetorheological elastomer materials to achieve the integration of induction power generation and frequency modulation vibration reduction. When the pressure is insufficient to cause the piezoelectric device to output current, the magnetorheological elastomer material still has the mechanical properties of an ordinary rubber elastomer, and the entire structure can still ensure the vibration reduction function while also achieving power-off protection.

The invention discloses a magnetorheological elastomer self-adaptive clamping mechanism for ceramic body machining, and relates to the technical field of ceramic machining. The device comprises a base, symmetrical clamping arms, a linear driver, a self-adaptive clamping plate assembly and a main control unit, a magneto-rheological elastomer column and a micro vortex vacuum pump are arranged in the self-adaptive clamping plate assembly, and the main control unit achieves clamping force closed-loop control with + / -0.02 N precision through a PID algorithm; the miniature vortex vacuum pump forms stable pressure difference adsorption in a 5Pa vacuum environment, and the friction force of the miniature vortex vacuum pump, the nanometer silica gel anti-skid layer and the clamping force of the magnetorheological elastomer form triple synergistic fixation. The technical problems of clamping damage and adsorption failure of the ceramic green body in the vacuum environment are solved, and the vacuum spraying device is suitable for machining procedures such as vacuum spraying and fettling of the unsintered / semi-sintered ceramic green body.

The present application relates to a kind of variable stiffness variable damping hydrodynamic inertance vibration isolation device, including cylinder, piston being movably arranged in the inside of cylinder, annular end cover being arranged in the top port of cylinder, the central axis of the piston is vertically through annular end cover;The inner peripheral side wall of the annular end cover is fixedly provided with annular end cover magneto-rheological elastomer, the inner peripheral side wall of the end cover magneto-rheological elastomer is fixedly provided with end cover electrically conductive sleeve, the inner side of the end cover electrically conductive sleeve is provided with end cover magnetic block fixed in the central axis of piston, end cover excitation coil is arranged on the end cover magnetic block and annular end cover, and the rigidity and damping of end cover magneto-rheological elastomer are controlled by the magnetic field generated by the energization of end cover excitation coil.The present application is reasonable in design, can realize the dynamic adjustment of rigidity and damping, effectively solve the problem that traditional structure is not good in vibration isolation effect when facing different frequency vibrations, and improve the practicality and universality of vibration isolation technology.

The invention belongs to the technical field of elastomer materials, and provides a high-performance neodymium iron boron / silicone rubber composite magnetorheological elastomer and a preparation method thereof. The preparation method comprises the following steps: activating neodymium-iron-boron magnetic powder, immersing the neodymium-iron-boron magnetic powder into a dopamine hydrochloride aqueous solution for deposition reaction, and adding a silane coupling agent for condensation reaction to obtain neodymium-iron-boron magnetic powder coated with a PDA-silane composite modified layer; and mixing the neodymium iron boron magnetic powder coated with the PDA-silane composite modified layer with a silicone rubber matrix, and sequentially carrying out curing treatment and magnetization treatment to obtain the high-performance neodymium iron boron / silicone rubber composite magnetorheological elastomer. The method is simple and low in cost, the magnetorheological elastomer with high-strength interface bonding, high magnetic responsiveness, excellent mechanical property, excellent electrical property and excellent thermal stability is successfully prepared, and a material foundation is laid for development of magnetic-force-electricity multifunctional coupling devices, advanced sensors and intelligent drivers.

The invention discloses a variable-stiffness magnetorheological fluid elastic vibration isolator for a variable-speed rotorcraft, which comprises a closed cavity formed by a magnetic flux outer cylinder, a magnetic flux inner cylinder and an annular magnetorheological elastomer connected between the magnetic flux outer cylinder and the magnetic flux inner cylinder, inertia liquid is filled in the cavity, and a magnet exciting coil is arranged in an outer ring groove of the magnetic flux inner cylinder. The magnetic flux outer cylinder, the magneto-rheological elastomer and the magnetic flux inner cylinder form a closed magnetic circuit, and the magnetic field intensity is changed by adjusting the current of the magnet exciting coil, so that the shear modulus of the magneto-rheological elastomer is continuously and reversibly adjusted and controlled, and online adjustment of the rigidity of the vibration isolator is achieved. The inner cylinder connected with the magnetic flux inner cylinder is provided with an inertia channel, when external vibration is introduced, liquid flows in the channel, and inertia force opposite to exciting force is generated at an anti-resonance frequency point to achieve efficient vibration isolation. The variable vibration frequency of the rotor wing is dynamically matched through the electronic control rigidity, the problems that a traditional vibration isolator is narrow in frequency band, and a mechanical frequency conversion scheme is slow in response and complex in structure are solved, and the vibration isolator has the advantages of being fast in response and compact in structure.

The invention belongs to the field of advanced pipe plastic processing and intelligent material application, discloses a pipe bending forming method based on a multi-dimensional gradient distribution magneto-rheological elastomer, and aims to solve the problems that an existing single-dimensional MRE cannot adapt to the pipe bending multi-area rigidity requirement, and the inner side wrinkles, the outer side wall thickness is reduced and the like due to the fact that a device is not provided with a special regulation and control module. The method comprises the following steps: preparing an axial (transition section-bending section magnetic particle gradual increase) and radial (center-circumference magnetic particle gradual change) multi-dimensional gradient MRE core mold, filling a pipe, and cooperatively optimizing a magnetic field and pressure through a fuzzy-PID (Proportion Integration Differentiation) algorithm by using a device comprising a non-magnetic component and a peripheral electromagnetic coil in combination with axial pressure, magneto-rheological rigidity and centrifugal force formula control parameters; the method can efficiently restrain forming defects, is suitable for high-strength, thin-wall and small-bending-radius pipes, and improves the forming quality and efficiency.

The invention relates to the technical field of elastic bushings, in particular to a magneto-rheological elastomer bushing for an automobile suspension and a vehicle suspension system. The magneto-rheological elastomer bushing comprises an inner sleeve and an outer sleeve which are coaxially arranged; the magnetorheological elastomer layer is filled between the inner sleeve and the outer sleeve, and the magnetorheological elastomer layer serves as a main bearing and rigidity adjusting component; the magnet exciting coil is arranged on the inner sleeve or the outer sleeve, and the magnet exciting coil applies a magnetic field to the magnetorheological elastomer layer to adjust the radial rigidity of the magnetorheological elastomer layer; the magneto-rheological elastomer composite material further comprises at least one magnetic conductive reinforcing piece which is arranged in the magneto-rheological elastomer layer in the radial direction, and the magneto-rheological elastomer layer is divided into at least two sub-layers in the radial direction by the magnetic conductive reinforcing piece. The rigidity of the vehicle can be instantly improved to enhance the control stability when high supporting performance is needed, the rigidity can be instantly reduced to optimize the riding comfort when high vibration filtering performance (such as a bumpy road surface) is needed, and dynamic intelligent balance between the two is achieved.

The invention relates to the technical field of mechanical engineering, and discloses an anti-vibration linear guide rail device which comprises a guide rail, a vertical vibration reduction sliding block structure, an objective table, a damping vibration reduction plate and a solid lubricating plate. The number of the vertical vibration reduction sliding block structures is at least two, the two vertical vibration reduction sliding block structures are arranged on the guide rail, the two vertical vibration reduction sliding block structures are connected through a damping vibration reduction plate, a solid lubricating plate is fixedly arranged below the damping vibration reduction plate, and an objective table is arranged above the damping vibration reduction plate; the damping vibration attenuation plate is made of a variable rigidity material; an electromagnetic coil in the vertical vibration attenuation sliding block structure is used for generating a changing magnetic field to change the rigidity of the damping vibration attenuation plate. The damping vibration attenuation plate is made of the magneto-rheological elastomer material, the variable magnetic field generated by the electromagnetic coil arranged in the guide rail is used for regulating and controlling the damping vibration attenuation plate in real time, the rigidity of the damping vibration attenuation plate is changed, and therefore the inherent frequency of a system is actively shifted, and the resonance condition is damaged.

The application provides a pot-shaped metal rubber-based magneto-rheological elastomer damping device and a working method thereof. The device comprises a top plate connected with the damping device, the top plate is connected with a conical magneto-rheological elastomer through adhesion in a slot hole in the middle of the top plate, and the top plate is connected with a ring-shaped magneto-rheological elastomer through adhesion in a convex part around the top plate, the lower surface of the ring-shaped magneto-rheological elastomer is connected with a magneto-rheological elastomer protective cover (4) through adhesion, a coil holder (5) with a winding electromagnetic coil is sleeved in the shell, the electromagnetic coil is connected with a controller (10) through a lead wire, and a pot-shaped metal rubber damper (8) is fixed in the coil holder; the controller is connected with an acceleration sensor (11) at the top plate; the damping device can realize self-adaptive adjustment of system parameters with the change of time and external excitation, the magnetic flux passing through the magneto-rheological elastomer is greatly improved, the rheological performance of the magneto-rheological elastomer is strengthened, and the damping device still has a certain damping effect after power-off.

A system may include a magnetic sensing elastomer. A system may include a rigid frame connected to the magnetic sensing elastomer. A system may include the magnetic sensing elastomer having a first end, a magneto-rheological elastomer (MRE) link and a second end; and wherein the magnetic sensing elastomer is configured to deflect in a direction by an amount based on an applied magnetic field and properties of a sample.

The invention relates to the technical field of medical apparatus and instruments, and discloses a biomechanics-based auricle noninvasive dynamic correction device and a use method thereof, the biomechanics-based auricle noninvasive dynamic correction device comprises a composite support structure, and the composite support structure is composed of an earmuff, an outer silica gel flexible wrapping layer and an inner memory alloy support skeleton; the double-air-bag collaborative traction system comprises a main air bag attached to the concave position of the auricle and auxiliary air bags distributed on the edge of the helix, and each air bag is provided with an independent micro air valve; according to the self-adaptive elastic butt joint system, a butt joint is made of a magnetorheological elastomer material; and the detachable auricle shape acquisition module is integrated with a micro pressure sensor array and has a data transmission function. Through the design of a composite supporting structure and a double-air-bag cooperative traction system, accurate regulation and control and scientific distribution of correction force are achieved, 0.1-5N stepless regulation of a main air bag and an auxiliary air bag is achieved through independent micro air valves, the overall contour is optimized through edge traction, and the accuracy and safety of the correction effect are remarkably improved.

The present application relates to a kind of composite powder for laser selective sintering and its preparation method, belong to magnetic material technical field.The present application is used for the composite powder of laser selective sintering, comprising: thermoplastic resin powder, magnetic powder and binder;The average particle size of the thermoplastic resin powder is greater than the average particle size of the magnetic powder;The magnetic powder is coated in at least part of the surface of the thermoplastic resin powder.The three-dimensional magneto-rheological elastomer product made of laser selective sintering using the composite powder has high density, and under the action of external magnetic field, it shows significant magneto-rheological effect.

A vibration isolation device is provided that is capable of supplying a greater current to a magnetorheological elastomer of a bushing assembly to correspondingly increase a magnetic flux density within the magnetorheological elastomer of the bushing assembly in accordance with the current supplied to the bushing assembly, and to achieve a greater change in stiffness. The vibration isolation device can be installed in a vehicle and includes a variable stiffness bushing assembly and a collar member composed of a magnetic body. The variable stiffness bushing assembly has an inner cylinder composed of a magnetic body and having a hollow shaft portion for fastening to the vehicle, an outer cylinder composed of a magnetic body and disposed coaxially with the inner cylinder on a radially outer side of the inner cylinder, a magnetorheological elastomer disposed between the inner cylinder and the outer cylinder, and a coil that applies a magnetic field that causes a change in viscoelasticity of the magnetorheological elastomer. The collar member is in contact with an axial direction end portion of the inner cylinder of the variable stiffness bushing assembly.

The invention relates to the technical field of cable protection, in particular to a cable protection sleeve. The protective sleeve comprises an inner layer, a middle layer and an outer layer, the middle layer comprises a first layer and a second layer, the first layer is fixedly connected with the inner layer, and the second layer is fixedly connected with the outer layer; the first layer is made of a glass fiber reinforced composite material, the second layer is of a grid framework structure made of a shape memory alloy material, the grid framework structure is embedded in the first layer, and inner grid spaces of the grid framework structure are filled with magnetorheological elastomers; the inner layer is a waterproof insulating layer sprayed on the first layer; the outer layer is made of a modified polyurethane material and is of a corrugated structure; the cable protection sleeve is provided with an opening structure, sealing parts are arranged on the two sides of the opening structure, the sealing parts on the two sides can abut against each other in a matched mode so that the installation cavity channel of the inner layer can be sealed and isolated from the outside, and the sealing parts are made of rubber materials. A plurality of rubber supporting rings are arranged on the inner wall face of the inner layer and protrude out of the inner wall face of the inner layer, and heat conduction grooves are formed in the rubber supporting rings.

The invention relates to a mouse spinal cord injury bionic compression modeling system and a method thereof.The system comprises a mechanical arm, a magneto-rheological-pneumatic loading compression module, a multi-mode optical fiber sensing probe and a control module, the magneto-rheological-pneumatic loading compression module comprises a shell, an air bag, a magneto-rheological elastomer and an air supply part, the shell is installed at the driving end of the mechanical arm, and the air bag is installed at the driving end of the mechanical arm; the air bag is installed in an inner cavity of the shell, the electromagnetic part is fixedly installed at the bottom of the inner cavity of the shell, the air supply part supplies air to the air bag, and the magnetorheological elastomer is fixedly installed at the end, away from the bottom of the shell, of the air bag. The multi-mode optical fiber sensing probe is installed at the end, away from the air bag, of the magnetorheological elastomer and used for detecting the microenvironment of the deep spinal cord tissue of the mouse. The injured spinal cord chronic compression animal model constructed by the scheme is high in fidelity, the clinical correlation of the model can be remarkably improved, and the experimental variability is reduced, so that a more reliable and more comprehensive research platform is provided for mechanism research and treatment strategy evaluation of degenerative spinal cord diseases.

The present application relates to the technical field of intelligent welding and precise assembly, in particular to a screw intelligent welding device, which comprises a laser emission head, a clamping main shaft with a coaxial light hole, a servo drive mechanism, a control system and a core electromagnetic chuck module, and is internally provided with a nickel-titanium memory alloy reed and a magnetorheological elastomer; the system realizes dynamic adjustment of clamping stiffness in combination with the control system and the excitation coil; the core is to monitor the contact thermal stress based on the inductance change rate during welding, to soften the magnetorheological elastomer to absorb the expansion thermal stress when the stress exceeds the standard, and to increase the current in a step to restore high stiffness to resist the shrinkage deflection torque during the solidification period; the present application discards the traditional static rigid clamping, solves the problem that it is difficult to balance the rigid constraint and flexible buffering in the unstructured constraint environment by using the dynamic adjustment mechanism of clamping stiffness, and realizes the dynamic cooperation of resisting the molten pool disturbance and releasing the thermal stress.

The invention provides a magneto-rheological layered damping device for a ship pipeline. The magneto-rheological layered damping device comprises a hoop unit, a supporting system, a magneto-rheological execution system, a sensing system and a central control unit. The supporting system sequentially comprises a first-layer supporting frame, a second-layer supporting frame and a third-layer supporting frame from inside to outside, the hoop unit is connected with the first-layer supporting frame through a top-layer magnetorheological damper, and the first-layer supporting frame is connected with the second-layer supporting frame through a magnetorheological elastomer liner. The second-layer support frame is connected with the third-layer support frame through the bottom-layer magnetorheological damper; the sensing system comprises a high-frequency dynamic pressure sensor, a three-axis acceleration sensor, a tilt angle sensor and a dynamic strain gauge; the central control unit identifies water hammer, cavitation, hull deformation, turbulence and other working conditions according to sensing data, and executes top layer and middle layer reinforced suppression, middle layer high-frequency dissipation, bottom layer stress release and global collaborative optimization control strategies respectively, decoupling isolation of fluid excitation and structural deformation is achieved, and the requirements of composite working conditions are met.

The invention relates to the technical field of electromagnetic protection materials, in particular to a dynamic stress balance composite cable, which comprises five layers of heterogeneous structures, namely a silver-plated copper conductor, a magneto-rheological elastomer buffer layer, a carbon nanotube enhancement layer, a shape memory alloy grid and an ultraviolet curing silica gel outer sheath from inside to outside in sequence, the asymmetric magnetic field generation system is embedded into a cable key node; stress concentration caused by eccentricity is avoided through a regular hexagon twisting mode of 1 center and 6 periphery, stress can be uniformly transmitted along the radial direction of the cable under dynamic load, and local strand overload is reduced; the nano silicon dioxide can improve the mechanical strength of the magnetorheological elastomer buffer layer, reduce the risk of deformation and cracking, enhance the interface bonding force between the buffer layer and the adjacent layer, and guarantee efficient stress transfer to assist in dynamic stress balance.