41results about How to "Increase shear deformation" patented technology

The invention relates to a rail, especially steel rail for railway or electric trolley. Damp rail comprises rail body, on whose non-working surface connector with convex rib or convex-concave structure is set, constraint body connected with rail body, set corresponding to connector, whose inner surface processes convex rib or convex-concave structure and damping body, set between connector and constraint body or among connector, rail body and constraint body, forms labyrinth constraint damping structure, which is set continuously or distantly along length direction of rail body. The rail can decrease shake generated by rail and control the shake and noise of rail in original source, while alleviate availably steel and wheel attrition generated by liberative energy of rail shaking so that there is good damping and noise reduction effect, and operating life of wheel and rail, safety and amenity of train running is largely improved.

A system for selectively controlling deformation. The system includes a first mechanism for resisting deformation about an axis of an accompanying fluid foil. A second mechanism, in communication with the first mechanism, enables deformation along the axis and/or at an angle to the axis. In more a specific embodiment, the axis is a lengthwise axis of the fluid foil, which is a transformable airfoil, and the system includes a bellows device that is approximately concentric with the axis. The bellows device is supported by first base structure at one end and a second base structure at another end. The deformation at an angle to the first axis includes shear deformation or bending deformation. The deformation along the axis includes extension or strain deformation. The deformation about the axis includes torsion deformation.

The invention relates to the field of metal continuous casting manufacturing, in particular to a method for producing an ultra-thick plate continuous casting blank by adopting fast cooling and unsymmetrical great pressing-down. According to the method, a continuous casting blank sequentially passes through a vertical section (2), an arc-shaped section (3), a straightening section (4) and a horizontal section (5) under a crystallizer (1), through the implementation of fast cooling and unsymmetrical great pressing-down in a secondary cooling region of a casting machine, the ferritiszation process of the casting blank surface layer is realized before the bending or straightening through the fast cooling process, in addition, the balanced separation of second-phase particles in crystals and at crystal boundaries is ensured, the surface layer tissues of the casting blank are improved, meanwhile, the deformation of a blank core part can be increased through the unsymmetrical great pressing-down process, the occurrence of surface cracks of medium and ultra-thick casting blanks in the bending and straightening process is prevented, and meanwhile, the center segregation and the center looseness of the ultra-thick casting blank is avoided. The method provided by the invention has the advantages that the surface quality and the center quality of the ultra-thick plate continuous casting plate can be better improved, so that the ultra-thick plate continuous casting blank can realize the rolling production of ultra-thick steel plates with the thickness being greater than 120mm at a low compression ratio.

The invention discloses an aluminum alloy plate material continuous extrusion method taking bar materials as blanks, and a continuous extrusion machine. The method comprises the following steps: A, dividing the blanks into multiple sections of bar materials, and connecting the head end face of the front-back adjacent bar materials with the tail end face of the front-back adjacent bar materials in each section of bar material; B, performing induction heating on the connected bar materials under the protection of inert gas through an induction device; and C, feeding heated bar materials into a rotary extrusion wheel, pressing the bar materials into a groove of the extrusion wheel through a pressing wheel, driving the bar materials through the groove in the extrusion wheel to enter a cavity and extruding to form a product through an extrusion mold in the cavity. According to the continuous extrusion method and the continuous extrusion machine, the problem that remarkable defects exist at the head-tail connection position of the bar materials during continuous extrusion of the magnesium alloy bar materials is solved; and the temperature of the magnesium alloy is increased by adopting induction heating under the protection of the inert gas, so the problems that the magnesium alloy has low plasticity at normal temperature and is broken when being pressed by the pressing wheel are solved.

The invention provides a composite-material energy-dissipation fender which comprises a shell and an energy-dissipation filling body wrapped inside the shell. The energy-dissipation filling body comprises energy-dissipation materials and a plurality of energy-dissipation ribs, the energy-dissipation ribs are distributed inside the energy-dissipation materials and/or between the energy-dissipation materials and the shell, and the energy-dissipation ribs are connected with the shell into a whole. The energy-dissipation ribs of the composite-material energy-dissipation fender form a longitudinally-transversely staggered net structure, the high shearing strength and the certain elastic deformation buffering capacity are achieved, the shell can be protected from large shearing deformation, and the composite-material energy-dissipation fender is good in overall collision avoidance effect, low in manufacturing cost, long in service life and convenient to maintain and repair.

The invention relates to a composite material viscoelastic damping rod which comprises mounting flanges at two ends and an intermediate rod between the mounting flanges, wherein the intermediate rod comprises three layers which are a rod body (1), a viscoelastic damping layer (2) and a restraint layer (3) of T series high-intensity carbon fiber composite materials from inside to outside sequentially, and the length of the intermediate rod is 200-1000mm; a damping rubber material with the dissipation factor greater than 1 is selected for the viscoelastic damping layer (2) to be pasted to the outer part of the rod body (1); M series high-modulus carbon fiber composite materials are selected for the restraint layer (3), and the damping layer (2) and the restraint layer (3) are molded by adopting a co-curing technology; and the intermediate section is divided through opening a U-shaped groove out of the restraint layer (3), and the number of the sections of the intermediate rod at the length direction is 3-12.

The invention discloses a metal shearing type energy dissipation device with the displacement amplifying function. The metal shearing type energy dissipation device comprises a restraining box body, a damping core plate and adjusting plate sets. An opening is formed in the top of the restraining box body. A first connecting plate is arranged at the bottom of the restraining box body. The damping core plate is arranged in the restraining box body, and the first end of the damping core plate is connected with the first connecting plate. The first ends of the adjusting plate sets penetrate the opening and are connected with the second end of the damping core plate through first pivot shafts in a pivoted manner. The second ends of the adjusting plate sets are connected with a second connecting plate located outside the restraining box body through second pivot shafts in a pivoted manner. Supporting point shaft holes close to the second pivot shafts is formed in the adjusting plate sets. Supporting point shafts are inserted into the supporting point shaft holes. The two ends of each supporting point shaft are arranged on the side wall of the restraining box body. According to the metal shearing type energy dissipation device with the displacement amplifying function, when the second connecting plate generates horizontal deformation, the adjusting plate sets are driven to rotate around the corresponding supporting point shafts, reversed deformation is applied to the damping core plate, deformation of the upper end of the damping core plate is larger than horizontal deformation generated on the second connecting plate, the damping core plate is accelerated to enter the plastic state, and the energy-dissipating capacity of the damping core plate is brought into full play, so that the structural shock resistance is improved.

The invention discloses a non-Newtonian fluid pneumatic soft touch hand and a forming method thereof. The non-Newtonian fluid pneumatic soft touch hand is composed of a touch hand and a chassis assembly, wherein the upper part of the touch hand is equipped with a strain-layer actuating cavity of a concave-convex structure, the middle part of the touch hand is equipped with a strain limiting layer,the lower part of the touch hand is equipped with a cuboid damping cavity with a separating plate, a gas cavity is arranged between the upper part and the middle part, and non-Newtonian fluid is arranged between the middle part and the lower part; when gas pressure is inflated into the actuating cavity, strain of the middle strain limiting layer part is smaller than that of an upper part actuating cavity unit, and therefore, the touch hand is laterally bent towards the strain limiting layer; and meanwhile, a lower part damping cavity unit is driven to bent, so that non-Newtonian fluid sealedin the damping cavity unit bears shearing stress. Viscosity of the non-Newtonian fluid generates changes along with a shearing rate, so that damping is generated, and therefore, an unstable phenomenongenerated in a bending process of the touch hand bearingexternal disturbance is eliminated. Moreover, stable control can be performed in a complex environment, so that target action is effectively accomplished.

The invention relates to a Moebius vibration isolator based on a wave mode conversion mechanism and an energy local effect. The Moebius vibration isolator is formed by combining multiple Moebius banded structures, and the multiple Moebius banded structures are connected into an integral structure through an upper part bearing force platform and a lower part bearing force platform; and the upper part bearing force platform and the lower part bearing force platform are respectively connected with upper part inclined plane regions and lower part circular arc regions of the Moebius banded structures. The Moebius vibration isolator provided by the invention couples the bending rigidity and torsional rigidity of the Moebius banded structures, the energy local region property is taken as an vibration isolation structure of a vibration isolation mechanism, and the Moebius vibration isolator has the advantages of large load-carrying ability, small static transformation, low inherent frequency, higher damping, and is capable of realizing low-frequency broad band transfer admittance and can not generate creepage, aging and temperature sensibility and the like.

The invention discloses a ribbed constrained damping layer structure which is characterized in that a structure layer, a damping layer and a constraining layer are superposed in sequence; the damping layer is made of a high-damping viscoelastic material, a ribbed constrained damping layer device is formed in a manner of fitting between the dimpling layer and the ribbed constraining layer and is mounted in a manner of adhesion between the damping layer and the structure layer. The ribbed constrained damping layer structure disclosed by the invention has the advantages that according to the ribbed constrained damping layer structure, the stiffness of the constraining layer is increased, the local deformation of the constraining layer in the transporting and mounting processes is reduced, and the disengaging phenomenon between the constrained damping layer and the structure layer is reduced during mounting, so that a good adhering effect on the constrained damping layer and the structure layer can be realized, and the shear deformation of the damping layer can also be increased. Therefore, the vibration reduction and noise reduction abilities of the ribbed constrained damping layer structure are improved.

The invention provides an unmanned aerial vehicle rotor arm structure with the outer surface additionally provided with a segmented constrained damping layer. An unmanned aerial vehicle rotor arm comprises a rotor arm body, the constrained damping layer and a viscoelastic damping layer; the rotor arm body is of a hollow cylindrical structure made of a carbon fiber material; the constrained dampinglayer and the viscoelastic damping layer are each of a segmented hollow cylindrical shell structure, and are made of an aluminum alloy and ZN-1 damping rubber correspondingly; and the rotor arm, theviscoelastic damping layer and the constrained damping layer are tightly bonded in sequence from inside to outside. By additionally arranging the segmented constrained damping layer on the outer surface of the unmanned aerial vehicle rotor arm, the viscoelastic damping layer deforms through elastic bending vibration of the rotor arm, and thus vibration energy of the unmanned aerial vehicle rotor arm is dissipated rapidly for vibration reduction. The structure is simple, a main body structure of an unmanned aerial vehicle is not affected, extra additional mass and control device are not needed,the flight stability of the unmanned aerial vehicle is improved, and the vibration suppression effect in practical application is remarkable.

The invention discloses a rubber bearing, comprising a plurality of layers of thin steel plates and a plurality of layers of rubber sheets. The multilayer rubber sheets re mainly rubber, and the rubber bearing is formed by vulcanizing and bonding the multiple layers of thin steel plates and the multiple layers of rubber sheets, and a layer of polytetrafluoroethylene plate 1.5 mm-3mm thick is bonded on the surface of the bearing. The rubber bearing has sufficient vertical rigidity to withstand vertical load and can reliably transmit the pressure of the upper structure to the pier abutment, goodelasticity to accommodate the rotation of the beam end and large shear deformation to meet the upper component.

The invention discloses a technique for improving the damping performance of TC4 titanium alloy through magnetron sputtering surface treatment. The surface treatment of TC4 titanium alloy is carried out to improve the damping performance. Optimum sputtering process parameters to deposit surface films on TC4 samples to improve the damping properties of TC4 titanium alloys. In the invention, a thin film with a thickness of nanometer or micrometer order is formed on the surface of TC4 alloy through magnetron sputtering technology. The interface between the film and the substrate and dislocations near the interface are often the main source of damping in the film material, and energy can often be dissipated through the mechanism of dislocation damping during vibration. Comparing the damping performance of TC4 alloy after surface treatment with that of untreated TC4 alloy, the damping coefficient of TC4 alloy is 0.0034, and the damping coefficient of TC4 alloy can be effectively improved by magnetron sputtering surface treatment technology, so that the damping performance of TC4 alloy can be improved 3-5 times.