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 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 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.

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 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.