166results about How to "Reduce vibration response" patented technology

The invention discloses a three-cylinder type large-capacity magneto-rheological damper for vibration control of a large civil engineering structure, which comprises a magneto-rheological damping cylinder (9), a puddle damping cylinder (5), an auxiliary cylinder (19), a magneto-rheological main piston (23), a puddle piston (6), a piston rod (17), a sealing baffle (20), a damping channel (16), a cylinder cover (3) and a spherical hinge joint (13), wherein magneto-rheological liquid (11) is filled in the magneto-rheological damping cylinder, and an annular excitation coil (8) capable of generating a magnetic field is arranged in the magneto-rheological damping cylinder; and the puddle damping cylinder is arranged adjacent to the magneto-rheological damping cylinder, and elastic puddle (7) is filled in the inner cavity of the puddle damping cylinder, thus the damper can generate large damping under the condition of large displacement, and the safety of the damper can be improved. By arranging a displacement splitting mechanism (18), the magneto-rheological damper has high rigidity and large damping in a low-frequency region and has low rigidity and small damping in a high-frequency region. Compared with the traditional magneto-rheological damper with the same size, the maximum capacity of the damper of the invention is improved by more than one time, and the vibration control of the large civil engineering structure is more effective.

The invention provides a multi-level damping grading yield metal damper comprising at least two annular damper bodies coaxially arranged in an inside and outside sleeving mode. An interval is arranged between the two adjacent annular damper bodies connected through a connecting base plate; the two annular damper bodies are used for being connected with a building structure; and when bent and deformed, the annular damper body relatively located in an inner ring preferentially yields than the annular damper body relatively located in an outer ring. The multi-level damping grading yield metal damper can produce the good damping energy dissipation effect in small earthquakes, middle earthquakes and large earthquakes simultaneously.

The invention discloses a fiber pre-stretched rod type self-centering steel buckling-restrained brace, comprising I-shaped steel, two internal restrained rectangular pipes, external restrained rectangular pipes, two end plates, fiber tension rods and connecting components, wherein the connecting components are arranged at two sides of a web of the I-shaped steel; the external restrained rectangular pipes are sleeved outside the I-shaped steel and the two internal restrained rectangular pipes; two end plates are arranged at the two ends of the I-shaped steel; the fiber tension rods are connected with the two end plates; the connecting components are connected with the end plates; the internal wall at one side of the I-shaped steel is connected with one end of each internal restrained rectangular pipe and the external wall at the other side of the I-shaped steel is connected with one end of each external retrained rectangular pipe; small holes arranged in arrays are arranged on the web of the I-shaped steel; the end plates are provided with nicks which are matched with the cross sections of the I-shaped steel; the end plates are inserted in the end parts of an I-shaped steel energy-consumption unit and are in contact with the end parts of the internal restrained rectangular pipes and the external restrained rectangular pipes; the fiber tension rod is located in the internal restrained rectangular pipes, and the end plates at two ends are tightly pulled by applying pre-stressing forces; and the external sides of the two end plates are respectively connected with the connecting parts.

The invention discloses a multi-dimensional collision energy consumption mass pendulum damper which consists of a mass ball, a steel cable, a metal cylinder and a viscose elastic material layer, wherein the metal cylinder is an inverted cylinder opening vertically downward; the mass ball, the steel cable and the viscose elastic material layer are all located in the metal cylinder; the mass ball and the steel cable are located in the middle of the metal cylinder; the upper end of the steel cable is fixedly connected with a cylinder bottom plate of the metal cylinder; the lower end of the steel cable is fixedly connected with the mass ball; the mass ball is suspended in the metal cylinder; the viscose elastic material layer is attached to the inner wall of the metal cylinder; and the viscose elastic material layer is arranged in a position capable of enabling collision with the mass ball when the mass ball swings in the metal cylinder so as to realize energy absorption, energy consumption and shock absorption. The damper disclosed by the invention can reduce the vibration reaction of the structure and solve the problem of the structure in seismic resistance and wind resistance.

The invention discloses a multidirectional rolling type vibration absorption damper which comprises a metal inner box body and an outer box body which are installed together in a sleeving manner; the outer wall of the inner box body is connected with the inner wall of the outer box body through vertical guide rails; the bottom of the inner box body is fixedly connected with the outer box body through an elastic vibration absorption component; the inner wall of the inner box body is connected with the outer wall of a mass block through shape memory alloy energy dissipation springs; a plurality of metal balls which can roll are arranged in the inner box body and are arranged in spherical grooves of the inner box body; the mass block is arranged on the tops of the metal balls, is contacted and connected with the metal balls, can slide in the inner box body in an arbitrary direction and enables the shape memory alloy energy dissipation springs to deform, so that the mass block has the action of energy dissipation vibration absorption in the horizontal direction; and energy in the vertical direction is dissipated by sliding up and down of the inner box body, and thus the multidirectional energy dissipation vibration absorption action is exerted.

The invention discloses a basalt fibre composite rib and a basalt fibre composite inhaul cable. The composite rib is formed by drawing, extruding, molding and compounding basalt fibre and carbon fibre under the pretension action, and fibre volume ratio is 4:1-1:1; the basalt fibre composite inhaul cable comprises an outer protecting layer and fibre reinforcement material arranged in the outer protecting layer, the fibre reinforcement material comprises a center rib and an outer rib, the center rib is composed of a basalt fibre rib or carbon fibre rib, the outer rib is composed of the basalt fibre composite rib, an adhesive elastic filling layer and an inner sleeve are arranged between the center rib and the outer rib, the inner side of the inner sleeve is connected with the adhesive elastic filling layer, and the outer side of the inner sleeve is connected with the outer rib. In the composite inhaul cable, the carbon fibre content occupies 25-40 percent of total fibre content of the inhaul cable. Compared with the prior art, the composite carbon fibre of the basalt fibre composite inhaul cable in the basalt fibre enables short-period and long-period mechanical property and chemical property of the inhaul integer to be better, and has remarkable economy.

The invention provides a secondary mirror supporting structure of a space optical remote sensing camera, belongs to the technical field of space optical remote sensing, and aims at solving the technical problems that the conventional supporting structure has high weight, low specific stiffness, high truss rod width and high obscuration ratio. One surface of the flange is evenly provided with multiple flange bosses. The edge of the same surface is evenly provided with multiple flange embedding connectors. The cross section of the truss rods is shaped like a Chinese character "ri". One end of each truss rod is connected with the top part of a truss cylinder base through a truss rod embedding connector, and the other end is connected with the flange through one flange embedding connector. Multiple pre-embedded members are fixed on the bottom part of the truss cylinder base. The structural stiffness can be strengthened and the advantages of stable structure and low gravity deformation canbe realized by the ring enforcing ribs arranged in the truss cylinder base, and the stray light shading capacity can also be provided. The cross section of the truss rods is shaped like the Chinese character "ri" so that the advantages of low obscuration, high stiffness and high lightweight rate can be realized.

Stator blade counts of an upper compressor casing for adjacent stages S0 and S1 are changed in the field to provide additional stator vanes and hence an increased vane count. Particularly, the upper casing half of the compressor is removed from the lower casing half. The original stator vanes on opposite axial sides of the first stage buckets are removed from the upper casing half and replaced by an additional sets of stator vanes providing a non-uniform vane spacing as between the upper and lower halves of the compressor as well as between axially adjacent stages S0 and S1. The unequal vane counts reduce the vibratory response of the rotating blades between stages S0 and S1.

A turbine bucket is provided that can make centrifugal stress acting on a blade or dovetail not greater than a limit value of a material and that is provided with a shape of a blade root that can ensure a steam passage even if the blade is increased in length in order to increase an exhaust area.

The turbine bucket is for a steam turbine low-pressure final stage and has an exhaust area exceeding 9.6 m² (13.8 m²) in steam-turbine final-stage buckets for a rated speed 3600 rpm (3000 rpm) machine. The turbine bucket is made of martensite steel. A blade portion of the turbine bucket has a suction surface 7 and a pressure surface 8 which are each formed, at a turbine blade root, of three areas consisting of a steam inlet side area 12 with curvature, a steam outlet side area 13 with curvature and an approximately straightly formed area put between the two areas. An airfoil of the turbine bucket root is formed such that the relationship between a blade pitch t and a turbine-axial width BW of the blade portion is BW/t≧5.

A superelastic marmem damper for cable, rope and slent rod used for anti-earthquake purpose is composed of external steel pipe, two flange at both ends of external pipe, internal steel pipe, two internal disks on internal steel pipe, marmen wires passing through the holes on said internal disks, and fixtures for fixing the both ends of each marmen wire.

The invention discloses an overlapping self-centering frictional energy-dissipating brace. The overlapping self-centering frictional energy-dissipating brace comprises an inner rectangular sleeve, an outer rectangular sleeve, a frictional energy-dissipating component, a first end plate, a second end plate and a pre-tension rod, wherein the frictional energy-dissipating component connects an inner sleeve bottom plate with an outer sleeve bottom plate, the first end plate is arranged in the inner sleeve, the second end plate is arranged in the outer sleeve, the pre-tension rod is arranged in the inner sleeve, and two ends of the pre-tension rod are anchored to the first end plate and the second end plate respectively. One part of the inner sleeve is inserted into the outer sleeve and overlaps with the outer sleeve, one end, inserted into the outer sleeve, of the inner sleeve contacts with the second end plate, and the first end plate contacts with one end of the outer sleeve. A top plate and the bottom plate at the non-overlapping end of the inner sleeve are connected with first connecting plates respectively, a top plate and the bottom plate at the non-overlapping end of the outer sleeve are connected with second connecting plates respectively, the first end plate contacts with inner sleeve push plates through a first end plate rubber pad, and the second end plate contacts with the inner sleeve push plates through a second end plate rubber pad.

The invention provides a novel high-precision hybrid vibration isolation device. The novel high-precision hybrid vibration isolation device comprises an assembly plate, an intermediate separation plate, a bottom plate, an air spring and magnetorheological dampers, wherein the assembly plate and the intermediate separation plate are connected through the magnetorheological dampers; the intermediate separation plate is fixedly connected with the air spring through bolts; and the bottom plate is fixedly connected with the air spring. The magnetorheological dampers are used for isolating low-frequency vibration signals coming from the ground; and since practical ground signal sources can be transferred along multi-dimensional directions, the four magnetorheological dampers have vibration isolation capability of six DOF (Degree of Freedom) directions. The air spring and the magnetorheological dampers are reasonably connected with the intermediate separation plate, so that high-precision active and passive hybrid vibration isolation capability can be realized. According to the novel high-precision hybrid vibration isolation device disclosed by the invention, a stackable structure is adopted, so that the structure is compact; the vibration isolation capability of multi-DOF can be realized, so that the novel high-precision hybrid vibration isolation device has the advantages of high practicability, high reliability and the like; and an advanced vibration isolation means is provided for a high-precision equipment platform.

The invention relates to a low noise thrust bearing device for a ship. The low noise thrust bearing device comprises a thrust bearing base, thrust bearing assemblies are installed on the thrust bearing base in the axial direction, one end of each thrust bearing assembly is connected with a prime motor through a high elasticity shaft coupling, and the other end of each thrust bearing assembly is connected with a stern shaft; the thrust bearing base is further fixedly connected with a ship body stern structure; multiple longitudinal vibration isolator assemblies are installed among the thrust bearing assemblies and the thrust bearing base and are all arranged in the axial direction; multiple radial vibration isolator supporting and hanging parts used for supporting connection are further installed among the thrust bearing assemblies and the ship body stern structure and are arranged in the radial direction with the thrust bearing assemblies being the center. The thrust bearing assembliesare in circumferential symmetry after the thrust bearing base is assembled, and the nonuniformity of transferring exciting force of a propulsion axis system ship body structure and vibration responsecaused by the nonuniformity are lowered.

The invention discloses a composite shock absorbing graded yield damper, which comprises frame assemblies and an energy dissipating assembly. The frame assemblies are fixed to a coupled shear wall, the frame assemblies are of annular frame structures, one or more than two frame assemblies are arranged, when two or more frame assemblies are arranged, each frame assembly has different sizes, and each frame assembly is coaxially arranged in a sleeving mode at intervals and fixedly connected by a plurality of connecting pads; and the energy dissipating assembly is fixed to the inner walls of the frame assemblies, and when two or more frame assemblies are arranged, the energy dissipating assembly is fixed to the inner wall of the frame assembly of an inner ring. According to the composite shockabsorbing graded yield damper, one or more annular frame assemblies and the internal energy dissipating assemblies are used for layer-by-layer shock absorption, and graded yield energy consuming of the composite shock absorbing graded yield damper in small earthquakes, medium earthquakes and large earthquakes is realized.

Provided is a hydraulic radial steel gate constrained damping layer vibration reduction design method. The method comprises the following steps that 1, finite element simulation unit selection is conducted on components of all parts of a radial steel gate, a curved panel adopts a shell unit to simulate the stress state, support arms, beams and longitudinal beams adopt a beam unit to simulate the stress state, hanger rods adopt a rod unit to simulate the stress state, and dynamical property analysis is conducted on the radial steel gate; 2, the equivalent mass of water is calculated by adopting a Westergaard method, and the dynamic property influence of water pressure on the radial steel gate is simulated; 3, structural mode strain energy analysis is conducted on the radial steel gate, it is obtained through analysis that the value of radial steel gate support arm mode strain energy is the maximum value, and by means of a constrained damping layer arranged on the support arm structure of the radial steel gate, a flow-induced load effect of the radial steel gate can be reduced. According to the hydraulic steel radial gate constrained damping layer vibration reduction design method, structural damping of the radial steel gate is increased, and a flow-induced load vibration effect is reduced.

The invention belongs to the technical field of vibration attenuation of electrical equipment and power transmission circuits, and relates to a collision energy-dissipation spacing rod. The collision energy-dissipation spacing rod is composed of a mass ball, a spring, a metal hollow ball, a metal circuit tube, a spacing rod frame, a wire clamp and a viscoelastic material layer. The invention aims to solve the problems of being single in function and limited in vibration attenuation effect in the existing spacing rod. When the external environment load is relatively low, the vibration attenuation effect is realized with the help of swinging of the mass ball; when the external environment load is relatively high, the swinging amplitude of the mass ball is increased; the mass ball is collided with a viscoelastic material on the inner wall of the metal hollow ball; the viscoelastic material can absorb a part of energy in the collision process, such that the energy dissipation effect is realized; because the mass ball can swing in a space in any direction and can be collided with the viscoelastic material on the inner wall of the metal hollow ball, the collision energy-dissipation spacing rod has the multi-dimensional vibration attenuation characteristics; and furthermore, the collision energy-dissipation spacing rod is simple to design and manufacture and can be widely applied in the technical field of vibration attenuation of electrical equipment and power transmission circuits.

The invention discloses a double-clutch hybrid control unit, comprising a subtractor, a proportion integration differentiation (PID) controller, an electric motor, an engine and a summer, wherein the subtractor is used for obtaining a difference of a vehicle speed and a gearbox input revolving speed; the PID controller is used for regarding the output of the subtractor as the input of the PID controller, obtaining an electric motor torque correction artificial signal through PID calculation, and adjusting the torque output of the electric motor; the electric motor adjusts the an electric motor torque according to the artificial signal; the engine adjusts an engine torque according to an accelerator; and the summer is used for adding the electric motor torque and the engine torque to obtain an output torque. The invention also discloses a double-clutch hybrid control method and a double-clutch hybrid control system. The double-clutch hybrid control unit, method and system disclosed by the invention can be used for electric vehicles and hybrid vehicles, and have less system vibration response.

High complex absorber which is used in civil engineering structure absorption of vibration. The interior and exterior steel pipe surrounded by the absorber consists of three parts, the central cavity is liquid amortisseur, and the side cavitys are lead amortisseur. On the left of the interior steel pipe, there fixes a board, on the right is the controlling board. On the left of the exterior steel pipe is fixed the inner board, on the right there respectively fixes the left and right ellipsoidal bulges between the left cavity baffle plate and the interior steel pipe and on the interior steel pip between the right baffle plate and the inner sealed plate. On the ellipsoidal bulges there is exterior perfusion lead, there are sealing port and pouring port in the central exterior wall of the exterior steel pipe, on the interior steel pipe is welded a moving valve in which there is a liquor tube and between the left cavity baffle plate and right cavity baffle plate is he perfusion liquor.

The invention discloses a variable-damping variable-rigidity viscoelasticity-friction composite damping device. The variable-damping variable-rigidity viscoelasticity-friction composite damping devicecomprises two symmetric cylinder type viscoelasticity damping device units and two cylinder type friction damping device units, the friction damping device units sleeve the outer sides of the cylinder type viscoelasticity damping device units, the cylinder type viscoelasticity damping device units sequentially comprise annular inner steel cylinders, annular viscoelasticity material layers and annular middle steel cylinders from inside to outside, elastic elements are sleeved with the middles of the annular inner steel cylinders, closed steel plates are mounted on two ends of the annular innersteel cylinders, cylinder viscoelasticity materials are mounted on inner sides of two ends of the annular middle steel cylinders, connecting anchorage steel plates are mounted on two ends of the annular middle steel cylinders, the friction damping device units sequentially comprise annular middle steel cylinders, annular friction pieces, annular friction plates and annular outer steel cylinders from inside to outside, the annular friction plates comprise first annular friction plates and second annular friction plates, and each annular outer steel cylinder is formed through connecting of an upper half annular outer steel cylinder and a lower half annular outer steel cylinder through bolt assembling.

The invention provides a satellite casing and a satellite using the same. The satellite comprises the satellite casing and an optical load, wherein the satellite casing comprises a casing main body; the casing main body comprises a first end surface, a bottom end surface opposite to the first end surface, and a second end surface; the bottom end surface is used for being connected with an external component, the second end surface and the first end surface are both positioned on the same side of the bottom end surface, and a distance from the second end surface to the bottom end surface is smaller than that from the first end surface to the bottom end surface; and the optical load is arranged on the second end surface. The satellite casing and the satellite, disclosed by the invention, have the advantages that the vibratory response of the satellite can be reduced when a powered phase is launched, and the large visual field requirement of the optical load can also be satisfied.