43results about How to "Small damping coefficient" patented technology

This invention discloses a tapered damp oil buffer used in a vacuum breaker including an oil cylinder, an end cover, a sealed coil, a piston component and a spreader spring, in which, the piston component and the spreader spring are set in the oil cylinder including a working region and a guide hole filled with buffer oil and sealed with an end cover and a sealing loop characterizing that: the clearance between the piston and the oil cylinder working region is a variable value, and the clearance is large in the prophase of the movement of the piston and the clearance is small in the latter perion of the movement, and the distribution of the brake of the oil buffer is matched to the braking process of a switch device.

The invention belongs to the technical field of human-computer interaction, and particularly discloses a robot variable admittance control method and system based on operator comfort. The method comprises the following steps: 1, pre-processing a human hand operating force to obtain an environmental interaction force; 2, generating a virtual damping adjustment strategy according to an operator comfort force and a robot end actual pose; and 3, constructing a robot six-degree-of-freedom admittance control model according to the virtual damping adjustment strategy to obtain a deviation force between the environmental interaction force and an expected force, and generating correction amounts of the position, speed and acceleration of the robot end according to the deviation force so as to correct the robot end actual pose. The system comprises a man-machine interaction module, a human hand operating force pre-processing module, a variable admittance control module and a robot end position control module. According to the method and the system, the damping coefficient in the admittance control is adjusted in real time according to the operator comfort force and the robot tail end speed,the calculation is simple, the real-time performance is high, and the operation feeling and the immersion feeling of man-machine interaction are improved.

The invention discloses a ship seaworthiness tester which comprises the components of a pair of vertical column racks, crossbeam racks which are arranged between the pair of vertical column racks, a seaworthiness testing device and a following brake device which are arranged on the crossbeam racks. The seaworthiness testing device utilizes a linear motor according to a magnetic suspension principle as a controlling and measurement mode, thereby measuring the motion attitude and added resistance condition of a ship model in the wave at conditions of ultralow damping and no other restraining conditions except for yawing and swaying. The following brake device utilizes the following principle of a linear motor. Through converting pneumatic cylinder movement to mechanical clamping, and clamping and loosening a track by a rail clamp, the ship model is started and stopped in the wave. The ship seaworthiness tester realizes accurate measurement for the seaworthiness state of the ship in a simulated wave.

The invention discloses a ship seagoing capability testing system. The ship seagoing capability testing system comprises a ship seagoing capability tester which is arranged on a water pond and can be dragged by a trailer, wherein the ship seagoing capability tester comprises a pair of stand column racks, a crossbeam rack which is arranged between the pair of stand column racks, and a seagoing capability testing device and a follow-up braking device which are located on the crossbeam rack. The seagoing capability testing device uses a linear motor in a magnetic levitation principle as a control and measurement means to measure a motion attitude and a resistance increase situation of a ship model in waves under no constraint conditions except yawing and swaying under a situation of ultralow damping. The follow-up braking device uses the follow-up principle of the linear motor, converts motion into mechanical clamping through a pneumatic cylinder and realizes starting and stopping control of the ship model in waves by clamping and releasing a track through a track clamp. The ship seagoing capability testing system realizes the accurate measurement of the seagoing capability of the ship model in simulated waves.

The invention relates to a load-sensing variable-damping electromagnetic shock absorption system which mainly comprises a gas spring, a pneumatic variable-current device, a vehicle-mounted power supply, a switch and an electromagnetic shock absorber. Load of a vehicle directly influences gas pressure in the gas spring, gas in the gas spring is introduced into the pneumatic variable-current device by a gas pipe, and the pneumatic variable-current device can change field current of the electromagnetic shock absorber according to the magnitude of the gas pressure, so that a function of adjusting the damping characteristic of the shock absorber according to the load of the vehicle can be achieved. The shock absorption system is suitable for vehicles with a greater useful load variation, such as a miniature van vehicle and a light truck, and can allow the vehicles to perform self-adaptive damping control according to different working conditions such as no-load or full load, so that the good riding comfort and the driving safety of the vehicles can be obtained within a whole useful load range. Compared with an electric control suspension, the shock absorption system does not require a sensor or an electric control unit, and is low in cost and high in reliability.

The invention provides an adjustable vertical magneto-resistor element, comprising a reference layer, a barrier layer, a memory layer, a function layer and an electrode layer which are adjacent sequentially, wherein reference layer is invariable in magnetization direction, and the magnetic anisotropy of the reference layer is perpendicular to the layer surface; the barrier layer is located between the reference layer and the memory layer and is adjacent to the reference layer and the memory layer; the memory layer is variable in magnetization direction, the magnetic anisotropy of the memory layer is perpendicular to the layer surface, the memory layer at least comprises a first memory sub-layer and a second memory sub-layer, the first memory sub-layer is a ferromagnetic material layer and is adjacent to the barrier layer, and the second memory sub-layer is an amorphous ferromagnetic material layer and is adjacent to the function layer; and the function layer is adjacent to the memory layer and is a material layer with a NaCl lattice structure, and a crystal plane of the function layer (100) is parallel to a base plane, a lattice constant in a crystal orientation [110] is slightly greater than a lattice constant of bcc phase Co in a crystal orientation [100].

The invention discloses a natural rubber composition material as well as a preparation method and application thereof. A raw material composition of the natural rubber composition material is preparedfrom the following components according to the parts by weight: 85-92 parts of natural rubber, 8-15 parts of butadiene rubber, 4-10 parts of activator A, 0.5-2 parts of activator B, 2-6 parts of anti-aging agent, 2-4 parts of protective wax, 1-3 parts of tackifier, 10-25 parts of carbon black, 3-8 parts of white carbon black, 1-1.4 parts of vulcanizing agent, 0.1-0.4 parts of accelerant A, and 1.2-2.5 parts of accelerant B. The natural rubber composition material prepared from the invention is low in damping coefficient, and excellent in mechanical property, and capable of improving the fatigue radiating feature of the material, relieving the fracture and damage of a rubber chain caused by the fatigue rapid heating, improving the durability life, improving the high temperature resistancefeature of the vulcanized rubber, and reducing the high temperature creep deformations of the vulcanized rubber. A prepared automobile engine suspension damping material NVH has the good control effect, and the service life of a road test reaches the standard.

The invention discloses a rubber material, and a preparation method and a use thereof. The rubber material comprises natural rubber, butadiene rubber, a diaryl secondary amine antioxidant, a dihydroquinoline antioxidant, a physical antioxidant, an activator zinc oxide, stearic acid, a silane coupling agent, carbon black, sulfur, 4,4'-dithiodimorpholine, tetramethylthiuram disulfide, N-cyclohexyl-2-benzothiazole sulfenamide and an anti-scorching agent. The rubber material has the advantages of low damping coefficient, good mechanical strength, good elastic ductility and satisfactory temperature resistance. The preparation method of the rubber material has the advantages of simple steps, convenience in operation, and suitableness for industrial production. An exhaust system cold end hanger made of the rubber material has the advantages of large pulling strength, long service life, wide vibration isolation frequency, and excellent NVH control efficiency in the acceleration stage in the high speed (90 km / h or more) driving process of an automobile.

The supporting unit for conveyer belt consists of support plate and support legs with elastic elements and below the support plate. The support plate has one continuous support surface layer of ceramic plates or GRP plates and in parabolic cross section. The supporting unit supports the conveyer belt, and the impact of the falling material and the vertical vibration of the carried material are absorbed by the elastic elements in the support legs. The continuous support surface layer in parabolic shape can avoid the early wear of its middle part to ensure smooth running of the conveyer belt, and the continuous support surface layer of ceramic plates or GRP plates has low damping coefficient, high friction resistance and fire retarding performance and is suitable for use in mine with gas.

The invention provides a magneto-resistor element with a three-decker memory layer. The magneto-resistor element comprises a reference layer, a barrier layer, the memory layer, a crystal lattice optimizing layer and a base layer which are sequentially adjacent to one another. The magnetization direction of the reference layer is unchanged, and the magnetic anisotropy of the reference layer is perpendicular to the layer surface. The magnetization direction of the memory layer is changed, and the magnetic anisotropy of the memory layer is perpendicular to the layer surface. The memory layer is composed of a first memory sub layer, a second memory sub layer and an inserting layer arranged between the first memory sub layer and the second memory sub layer, wherein the first memory sub layer, the second memory sub layer and the inserting layer are sequentially arranged adjacent to one another. The barrier layer is adjacent to the first memory sub layer. The crystal lattice optimizing layer is adjacent to the second memory sub layer, the crystal lattice optimizing layer is a material layer of a NaCl crystal lattice structure, and the crystal face of the crystal lattice optimizing layer is parallel to the plane of a base. The crystal lattice optimizing layer further includes at least one doping element, and the crystal lattice optimizing layer further can be of a double-decker structure. The magneto-resistor element further comprises a magnetic calibration layer and a spin polarization stable layer, and the magnetic calibration layer and the spin polarization stable layer are sequentially arranged between the base layer and the crystal lattice optimizing layer.

The invention discloses a yarn-passing alarm panel for an embroidery machine, comprising a base board. Yarn trappers, a yarn-passing detector, a surface tension adjustor and a yarn-passing nail are arranged on the base board; a yarn trapping sheet in the upper yarn trapper is used for pressing embroidery yarn through constant pressure; a yarn-passing wheel and a light shielding piece are installed on a ball bearing through a shaft pin, so that the yarn-passing wheel and the light shielding piece can be driven to rotate more smoothly by the embroidery yarn, and the damping coefficient is lower; the tension of the embroidery yarn and integral tension can be more conveniently and effectively adjusted to be uniform by the single surface tension adjustor; the embroidery yarn is also pressed by a yarn trapping sheet in the lower yarn trapper through constant pressure; the shaking of the embroidery machine, which is generated during taking up the yarn in the embroidering process, can not influence an area between the upper yarn trapper and the lower yarn trapper, so that tensile force well adjusted by the surface tension adjustor can be stably output; and when the embroidery yarn does not shake, the light shielding piece rotates more smoothly, and the detection of the light shielding piece, which is carried out through electronic control, can be more accurate, thereby solving the defect of frequent misinformation of an yarn-passing base board of an original embroidery machine even by adopting two detection points.

A suspension for a seat that varies the preload, spring rate and damping rate of the suspension in direct proportion to the suspended weight of an occupant of the seat to provide the same effective vibration isolation for any occupant. The suspension includes an actuating mechanism engaged with a first spring and a pivotal transfer link that is engaged with a second spring and a non-adjustable rate damper that are each fixedly attached to the seat opposite the transfer link. The transfer link is engaged with a weight adjustment mechanism which operates to adjust the position of a pivot pin for the transfer link with respect to the transfer link, such that the preload, spring rate and damping rate of the suspension are adjusted in proportion to the weight of the occupant of the seat to provide similar ride dynamics to any occupant of the seat.

This invention discloses a tapered damp oil buffer used in a vacuum breaker including an oil cylinder, an end cover, a sealed coil, a piston component and a spreader spring, in which, the piston component and the spreader spring are set in the oil cylinder including a working region and a guide hole filled with buffer oil and sealed with an end cover and a sealing loop characterizing that: the clearance between the piston and the oil cylinder working region is a variable value, and the clearance is large in the prophase of the movement of the piston and the clearance is small in the latter perion of the movement, and the distribution of the brake of the oil buffer is matched to the braking process of a switch device.

The invention discloses a high-energy consumption viscoelastic vibration isolating damper for an engine. The high-energy consumption viscoelastic vibration isolating damper comprises an upper damping block and a lower damping block, wherein the upper damping block comprises a central shaft, a high-energy consumption viscoelastic material fixed on the central shaft, an upper metal gasket arranged on the top surface of the high-energy consumption viscoelastic material and an upper support arranged on the lower part of the high-energy consumption viscoelastic material; the lower damping block comprises the high-energy consumption viscoelastic material, a lower metal gasket arranged on the bottom surface of the high-energy consumption viscoelastic material and a lower support arranged on the upper part of the high-energy consumption viscoelastic material. According to the vibration isolating damper, the high-energy consumption viscoelastic material can increase damping ratio of a structural system and enhance a vibration isolating effect of a low-frequency area, so the vibration isolation and vibration damping effects are achieved.

The invention discloses an empty / full load adaptive pressure compensation type oil-gas suspension cylinder, which comprises a cylinder head, a cylinder barrel, a sealing seat ring, a piston rod, a piston, a stopper, etc.; an upper oil chamber, a lower oil chamber, There are three oil chambers in the auxiliary oil chamber. Inside the cylinder, a damping passage is set between the upper oil chamber and the lower oil chamber, and a damping passage is arranged between the lower oil chamber and the auxiliary oil chamber; a check valve and a The damping hole is connected with the auxiliary oil chamber and the lower oil chamber through the external passage to form the external damping passage of the cylinder; the position of the one-way valve and the damping hole arranged on the cylinder barrel is arranged between the stroke position range of the suspension cylinder from no load to full load of the piston between. The invention enables the suspension cylinder to automatically obtain different damping coefficients when the vehicle is empty and fully loaded, and at the same time, the pressures of the lower oil chamber and the auxiliary oil chamber maintain mutual compensation, reduce or eliminate the negative pressure phenomenon in the system, and increase the work of the suspension cylinder system. Stability and reliability; comprehensively improved the technical level of hydraulic and pneumatic suspension cylinders.

The invention discloses a silicon resonation type pressure sensor based on a synovial membrane differential structure and a manufacturing method thereof, belonging to the technical field of sensors. The silicon resonation type pressure sensor mainly comprises a resonator 2, a strut 1, a pressure sensing membrane 3 and a frame 4, wherein the upper part of the frame 4 is connected with four sides of the pressure sensing membrane 3, and the lower part is provided with a cavity at the place corresponding to the pressure sensing membrane 3 so that tested air gets into contact with the pressure sensing membrane 3 after passing through the cavity. The strut 1 is arranged on the upper surface of the pressure sensing membrane 3, while the resonator 2 is suspended on the upper surface of the pressure sensing membrane 3 through the strut 1and the frame 4. The silicon resonation type pressure sensor simplifies the manufacturing process and the layout and reduces the influence of air leakage during packaging to the performance of the sensor; and the adopted differential structure can restrain the common-mode noise and increase the sensitivity, thereby improving the noise-signal ratio of an output signal and lowering the detection difficulty of external circuits.

The invention provides a magnetoresistance element with a three-layer structure memory layer, including a reference layer, a barrier layer, a memory layer, a lattice optimization layer and a base layer that are adjacent in sequence; the magnetization direction of the reference layer remains unchanged and the magnetic The anisotropy is perpendicular to the layer surface; the magnetization direction of the memory layer is variable and the magnetic anisotropy is perpendicular to the layer surface, and it consists of a first memory sub-layer, a second memory sub-layer and an intermediate layer arranged adjacently in sequence. The intervening layer between the first memory sub-layer and the second memory sub-layer is composed of three films; the barrier layer is adjacent to the first memory sub-layer; the lattice optimization layer is connected to the The second memory sub-layer is adjacent, the lattice optimization layer is a material layer with a NaCl lattice structure and its (100) crystal plane is parallel to the substrate plane, and also contains at least one doping element, the lattice optimization layer The layer may also be arranged as a double-layer structure; it also includes a magnetic correction layer and a spin polarization stabilizing layer, which are arranged in sequence between the base layer and the lattice optimization layer.

The invention provides a magnetic tunnel junction structure and a magnetic memory thereof. The magnetic tunnel junction structure comprises free layers of a double-layer structure, a perpendicular anisotropy enhancement layer and a magnetic damping barrier layer, wherein the perpendicular anisotropy enhancement layer is arranged between the two free layers and formed by a metal oxide layer containing doping elements, and the magnetic damping barrier layer is arranged above the free layers. The vertical anisotropy enhanced double-free-layer structure is adopted, the energy barriers of the free layers are regulated and controlled, the thermal stability is improved, and the damping coefficient is regulated and controlled, so that the write current is reduced.

The invention discloses a ship seaworthiness tester which comprises the components of a pair of vertical column racks, crossbeam racks which are arranged between the pair of vertical column racks, a seaworthiness testing device and a following brake device which are arranged on the crossbeam racks. The seaworthiness testing device utilizes a linear motor according to a magnetic suspension principle as a controlling and measurement mode, thereby measuring the motion attitude and added resistance condition of a ship model in the wave at conditions of ultralow damping and no other restraining conditions except for yawing and swaying. The following brake device utilizes the following principle of a linear motor. Through converting pneumatic cylinder movement to mechanical clamping, and clamping and loosening a track by a rail clamp, the ship model is started and stopped in the wave. The ship seaworthiness tester realizes accurate measurement for the seaworthiness state of the ship in a simulated wave.

The invention discloses leather deliming equipment. The leather deliming equipment comprises an equipment body, wherein a rotating drum is movably mounted in the middle of the equipment body, and a feeding opening is formed in the outer surface of the rotating drum. A rotating wheel is movably mounted in the middle of the rotating drum, and a purifier is fixedly mounted on one side of the rotatingwheel. One end of the purifier is fixedly connected with an air pump, and a power supply cabinet is fixedly mounted on one side of the air pump. A control cabinet is fixedly mounted on the position near the lower end of the outer surface of the equipment body, and a control panel is fixedly mounted on the position near the upper end of the outer surface of the control cabinet. The leather deliming equipment is provided with a drying tube, a ball bearing and a reducer, ammonia gas generated during deliming can be effectively purified, pollution is reduced, and the friction coefficient of a rotating mechanism can be effectively reduced; the rotation efficiency is improved, and the rotation speed can be effectively matched; and the rotation is smoothly reduced, the service life of the equipment is prolonged, and better use prospects are achieved.

The invention discloses a magnetic random access memory storage cell and a magnetic random access memory. The storage cell comprises a reference layer, a barrier layer and a first free layer which are arranged in a stacked manner, a plurality of second free layer groups are further arranged above the first free layer, the plurality of second free layer groups are composed of a lower vertical coupling layer and an upper second free layer, the vertical coupling layer and the second free layer are stacked in sequence in a double-layer structure mode, and a magnetic damping barrier layer is manufactured on the uppermost second free layer; the vertical magnetic coupling layer is used for realizing strong magnetic coupling of the first free layer and the second free layer and providing additional anisotropic sources of a vertical interface; the magnetic damping barrier layer provides an additional source of anisotropy while reducing the magnetic damping coefficient of a film layer.

The invention provides a magnetic tunnel junction structure and a magnetic random access memory thereof. The magnetic tunnel junction structure comprises free layers of a double-layer structure, a perpendicular anisotropy enhancement layer formed by non-magnetic metal oxide between the two free layers, and a magnetic damping barrier layer arranged above the free layers. Through the magnetic tunnel junction structure design that the double free layers are combined with the vertical anisotropy enhancement layer, the thermal stability of the device is enhanced, the damping coefficient is reduced, and the reduction of write current is facilitated.

The invention discloses a construction method for clearing the blockage of the vibrating screen hole, which comprises the following steps: Step 1: the control system coordinates the regular operation of each component of the driving device, the hammer head hits the screen mesh of the vibrating screen, and the pressure regulator pulls out the spring The medium inside the helical tube and telescopic rod is depressurized, the damping coefficient of the spring helical tube decreases and becomes softer, the thrust of the spring on the support plate and the nut C is reduced, and the vibration efficiency is improved, and the rapid preliminary vibration cleaning is completed for the serious blockage of the screen holes; step 2 : Control the pressure regulator to fill the spring spiral tube and the telescopic rod with medium, boost the pressure, the bolt bounces up under the vibration, the telescopic rod is stretched, and the telescopic rod pumps the medium inside the spring spiral tube to the inside of itself through the connecting pipe, The damping coefficient of the spring spiral tube is reduced, the spring becomes softer and the thrust of the support plate and the nut C is reduced, and the resonance effect of the bolt bouncing upward due to vibration is achieved, which solves the problem of poor resonance effect of the existing spring with a fixed damping coefficient .

The invention discloses a novel magnetorheological damper and a vehicle smoothness control method. The novel magnetorheological damper comprises a working cylinder barrel, a piston, a flow blocking device and magnetorheological fluid, a piston cavity and a motor cavity which are adjacent to each other are formed in the working cylinder barrel, the piston comprises a piston head and a piston rod, the piston head is arranged in the piston cavity, and a plurality of first bypass holes are distributed in the piston head. The bottom of the piston rod is fixed to the piston head, a flow blocking device sleeves the piston rod and can move up and down along with the piston, a transmission mechanism capable of driving the flow blocking device to rotate relative to the piston is arranged in the motor cavity, a plurality of areas are distributed on the flow blocking device, and a set of second bypass holes are formed in each area. One set of second bypass holes at least comprise one second bypass hole, the transmission mechanism drives the flow blocking device to rotate relative to the piston, the number of aligned first bypass holes and the second bypass holes can be changed, the magnetorheological fluid is arranged in the piston cavity, and the smoothness of a vehicle under different load conditions and different road conditions is improved.

The invention relates to a load-sensing variable-damping electromagnetic shock absorption system which mainly comprises a gas spring, a pneumatic variable-current device, a vehicle-mounted power supply, a switch and an electromagnetic shock absorber. Load of a vehicle directly influences gas pressure in the gas spring, gas in the gas spring is introduced into the pneumatic variable-current device by a gas pipe, and the pneumatic variable-current device can change field current of the electromagnetic shock absorber according to the magnitude of the gas pressure, so that a function of adjusting the damping characteristic of the shock absorber according to the load of the vehicle can be achieved. The shock absorption system is suitable for vehicles with a greater useful load variation, such as a miniature van vehicle and a light truck, and can allow the vehicles to perform self-adaptive damping control according to different working conditions such as no-load or full load, so that the good riding comfort and the driving safety of the vehicles can be obtained within a whole useful load range. Compared with an electric control suspension, the shock absorption system does not require a sensor or an electric control unit, and is low in cost and high in reliability.

An ocean energy development platform includes: a sealed structure providing an accommodating chamber with electrostatic shielding function; and N energy collection units integrated in the accommodating chamber. Preferably, in some or all of the N energy collection units, each energy collection unit includes: a double pendulum structure; and a generator structure. The generator structure is arranged on one side or both sides of the double-wire pendulum structure, and is used for converting the mechanical energy in the swinging state of the double-wire pendulum structure into electrical energy. Effectively solve the problems of seawater corrosion caused by the traditional energy harvesting unit directly contacting seawater, seawater electrostatic induction weakening energy harvesting efficiency and electrical output performance, maintenance difficulties, etc., and effectively achieve lower damping coefficient, high frequency output and ultra-high frequency. Due to the high volume power density output, the output performance of the generator on this platform is 1-2 orders of magnitude higher than that of the traditional triboelectric nanogenerator to collect ocean energy, which has high practical value.

The invention provides a magnetoresistance element with a double-layer optimization layer, including a reference layer, a barrier layer, a memory layer, a first lattice optimization layer, a second lattice optimization layer and a base layer that are adjacent in sequence; The magnetization direction of the reference layer is constant and the magnetic anisotropy is perpendicular to the layer surface; the magnetization direction of the memory layer is variable and the magnetic anisotropy is perpendicular to the layer surface; the barrier layer is located between the memory layer and the reference layer. between layers and adjacent to the memory layer and the reference layer respectively; the first lattice optimization layer is adjacent to the memory layer, and the first lattice optimization layer is a material with a NaCl lattice structure layer and its (100) crystal plane is parallel to the substrate plane; the second lattice optimization layer is a NaCl lattice material layer containing at least one doping element and its (100) crystal plane is parallel to the substrate plane; further comprising A magnetic correction layer and a spin polarization stabilizing layer are arranged in sequence between the base layer and the second lattice optimization layer.

The invention discloses a novel magneto-rheological shock absorber and a vehicle ride comfort control method, comprising a working cylinder, a piston, a damper and a magneto-rheological fluid. The working cylinder is provided with an adjacent piston cavity and a motor cavity , the piston includes a piston head and a piston rod, the piston head is arranged in the piston cavity, a plurality of first bypass holes are distributed on the piston head, the bottom of the piston rod is fixed to the piston head, and the flow stopper is sleeved on the piston rod and can As the piston moves up and down, there is a transmission mechanism in the motor cavity that can drive the flow baffle to rotate relative to the piston. The bypass hole contains at least one second bypass hole, and the transmission mechanism drives the damper to rotate relative to the piston, which can change the number of aligned first bypass holes and second bypass holes. The magnetorheological fluid is arranged on the piston In the cavity, improve the ride comfort of the vehicle under different load conditions and different road conditions.