1355results about How to "Good vibration damping" patented technology

The inventive vibration absorber comprises an execution unit, a control unit and a sensor. The execution unit consists of a magnetic inductor, a coil, a magnetic rheological elastic body, a vibration-absorbing mass block and a base. The above magnetic inductor consists of inner and outer sleeves, or a U-shaped iron-core and an armature or top and bottom plates and a column iron-core. Between inner and outer sleeves, the U-shaped iron-core and the armature or the top and bottom plates are filled the magnetic rheological elastic bodies. By regulating the voltage on the coil, the rigidity and the elasticity of the magnetic rheological elastic body are regulated to make its vibration frequency change, so as to make the vibration frequency of the vibration absorber execution unit is the same as that of the vibration-damping object.

The invention discloses a micro-stress assembly flexible supporting method of a small-calibre micro-crystal glass material reflector. The method comprises the following steps of: firstly, carrying out lightweight processing on the back of the reflector, and processing a central column in the centre of the back; secondly, processing a flexible core shaft having an equilateral triangular structure, processing a hollow cylinder in the middle of the flexible core shaft, respectively processing a connecting part having a cuboid structure at three angles, processing three rectangular through holes between the cylinder and the connecting part, and processing a flexible discharging groove, a mounting hole and a pin hole in the connecting part; and finally, directly bonding and fixing an outer surface of the cylinder of the flexible core shaft with an inner surface of the central column at the back of the reflector. By the method, the positioning accuracy of the reflector is improved integrally, temperature adaptability is improved, a forced environment of the reflector during assembly is improved, and optical aberration such as field curvature and astigmatism generated by compression in the conventional mode is eliminated.

The invention discloses a variable-stiffness variable-damping shock absorber based on a magnetorheological damper. The shock absorber is characterized in that an outer cylinder body is glidingly mounted on the outer side of the magnetorheological damper; a spring mounted in the outer cylinder body is connected with the piston rod of the magnetorheological damper; when the magnetorheological damper and the spring vibrate by external pressure, the outer cylinder body slides on the outer side of the magnetorheological damper to change the travel of the whole shock absorber, and meanwhile, the electrification coil of the magnetorheological damper is electrified and the shape of a magnetorheological fluid is changed to change the damping of the shock absorber. According to the shock absorber, the magnetorheological damper is combined with the spring, so that the stiffness and damping of the shock absorber can be changed; the shock absorber is large in travel and can meet the requirements of an environment in need of the shock absorber with large travel.

The invention discloses a piezoelectric and electromagnetic induction dual energy feedback type magneto-rheological vibration damper which comprises a vibration damper body and a vibration damper controller. The vibration damper body comprises a cylinder barrel, a pressure supporting floating piston, a middle isolation floating piston, a piston rod, piezoelectric generation modules, a spring pressing plate, a force transfer spring, a spring clamping seat, a lower permanent magnet, a magnetic coil, an upper permanent magnet, a magnetism isolating plate, a piston, an excitation coil winding, an electromagnetic induction coil fixing rod and an electromagnetic induction coil. A control box is arranged on the outer wall of the cylinder barrel, the vibration damper controller is arranged inside the control box, and a rectifier, a storage battery charging circuit, a first controllable constant current source circuit and a second controllable constant current source circuit are further arranged inside the control box. The invention further discloses a control method of the piezoelectric and electromagnetic induction dual energy feedback type magneto-rheological vibration damper. The piezoelectric and electromagnetic induction dual energy feedback type magneto-rheological vibration damper has the piezoelectric and electromagnetic induction dual energy feedback function, can achieve not only a damping change function but also a rigidity change purpose, and has good vibration damping performance.

The invention discloses a semi-active magnetic-current variable-piezoelectric feedback type damper, comprising an inner tube and an outer tube. A revolving shaft is arranged in the middle of the innertube, and is fixedly connected with two vanes which are arranged by the angle of 180 degrees in the inner tube. The vanes are hollow and provided with mass blocks inside respectively, the upper and lower ends of each mass block are connected with the inner wall of the corresponding vane through springs. Two thin plates are arranged in the inner tubes and perpendicular to the vanes respectively. The cavity of the inner tube is filled with magnetorheological fluid. Piezoelectric generator units are respectively arranged on the surfaces of the thin plates, and pressure sensors are respectively arranged at the tops of the piezoelectric generator units. The outer wall of the inner tube is wound with a field coil along the axis direction. The pressure sensors, the field coil, a controller and an electric power extracting and storing unit are in series connection to form a closed loop, wherein the controller and the electric power extracting and storing unit are arranged at the top of the inner tube.

An array-type novel high-performance eddy current damper consists of an electrical eddy current energy consuming unit, an elastic buffer unit, an electromagnetic shielding component, an axial displacement guiding unit and a supporting component, wherein the elastic buffer unit, the electrical eddy current energy consuming unit and the axial displacement guiding unit are sequentially inlaid on the supporting component from the bottom up; the bottom of the electrical eddy current energy consuming unit serving as a core component of the damper is connected with the top of the elastic buffer unit; the top of the electrical eddy current energy consuming unit is connected with the bottom of the axial displacement guiding unit; a flexible spherical hinged support is arranged at the top end of the damper and is connected with the axial displacement guiding unit and an external load to output a damping force; and a flexible spherical hinged support is arranged at the bottom end of the damper and is used for fixing the damper. The array-type novel high-performance eddy current damper has the advantages of adjustable damping coefficient, high ratio of the damping force to the integral mass of the damper, compact structure, high reliability and the like; and in the technical field of structural vibration control, the array-type novel high-performance eddy current damper has relatively high practical value and wide application prospect.

The invention provides an adjustable-inherent-frequency composite power vibration absorber and a control method of the adjustable-inherent-frequency composite power vibration absorber. The adjustable-inherent-frequency composite power vibration absorber comprises a signal collecting unit, a control unit and an executing unit, wherein the executing unit consists of two parts including a rigidity adjustment unit and a mass adjustment unit, the rigidity adjustment unit comprises a U-shaped base frame, excitation coils and a pre-tightening screw bolt are attached to the U-shaped base frame, a vibration absorption block is positioned between two magneto-rheological elastic bodies and is fixedly arranged between two clamp plates through the pre-tightening effect of the pre-tightening screw bolt, and a liquid storage box, a liquid pump and a liquid lower cavity are connected through a hose. The adjustable-inherent-frequency composite power vibration absorber and the control method have the advantages that the design structure is simple, the vibration absorption effect is good, an effective vibration reduction frequency band is wide, the performance is stable, the control response time is short, and practical values are very high; on the basis of the existing self-adaptation type vibration absorber, the effective vibration reduction frequency band is further widened, and the problem of too short effective vibration reduction frequency band of a traditional power vibration absorber is solved; the defect that an active type power vibration absorber excessively depends on external energy is overcome.

The invention discloses a wind generating set gear box elastic support device convenient to disassemble and adjust. The device comprises a shock absorption support seat, an upper shock absorber and a lower shock absorber. The device is characterized in that the shock absorption support seat comprises an upper beam, two uprights and a lower seat plate, wherein the upper beam is detachably connected with the upper parts of the two uprights, and the lower seat plate is detachably connected with the lower parts of the two uprights; a mounting hole passes through the center of the upper beam; the device also comprises an upper shock absorber mounting component, a lower shock absorber mounting component and a locking/disassembling adjusting component, wherein the upper shock absorber mounting component is arranged at the inner lower part of the mounting hole of the upper beam; the lower shock absorber mounting component is arranged on the lower seat plate; the locking/disassembling adjusting component is arranged at the inner upper part of the mounting hole and contacts the top part of the upper shock absorber mounting component; and when the top part of the locking/disassembling adjusting component is level with the top surface of the upper beam, the bottom part of the upper shock absorber mounting component protrudes out of the bottom surface of the upper beam. The device has the advantages of large bearing capacity, good shock absorption performance, simple structure and safety and reliability, and is convenient for maintenance and replacement of elements.

The invention relates to an ultra-high molecular weight polyethylene resin composition which comprises the following components in parts by weight: 55-80 parts of ultra-high molecular weight polyethylene resin, 10-40 parts of reinforced fiber, 0.5-8.0 parts of carbon black, 0.005-1.05 parts of antioxygen, 0.1-3.0 parts of silane coupling agent, 0.5-8.0 parts of solid lubricant and 0.5-8.0 parts of inorganic filler. The composite material plate prepared by the ultra-high molecular weight polyethylene resin composition has the advantages of favorable wear resistance, shock resistance, vibration reduction and corrosion resistance, high mechanical strength, and is especially applicable to the surface layer of structural parts with high wear resistance requirement, such as vehicle base plates and the side plate linings.

The invention relates to a lamp which comprises a lamp body and a damping device connected with the lamp body, wherein the damping device comprises a first mounting plate, a second mounting plate, a connecting rod, a first spring and a second spring; the first mounting plate and the second mounting plate are mutually parallel; the connecting rod is provided with a first end part and a second end part which are opposite; the second end part is penetrated into the first mounting plate and fixed on the second mounting plate; the first spring is clamped between the first mounting plate and the first end part of the connecting rod; the second spring is clamped between the first mounting plate and the second mounting plate and sleeved on the connecting rod; the first mounting plate extends along the axial line direction of the connecting rod to form a first sleeve; and the first spring is at least partially accommodated in the first sleeve. By adopting the structure, the lamp has better damping property and longer service life.

The invention discloses a vibration damping and energy absorption method for an automobile sub-frame, which comprises the steps of (1) performing finite-element analysis to an sub-frame to obtain the quality, the first-order bending mode and the corresponding maximum displacement site of the sub-frame; (2) arranging a mass block with an elastic damping system to damp vibration and absorb energy; and (3) performing modal analysis and experimental verification on the improved sub-frame to correct the elastic damping system and the mass block parameters. The inventive method does not change the current structure of the sub-frame, and arranges the mass block with the elastic damping system in a specific position on the sub-frame to reduce the vibration amplitude by utilizing the principle of resonance energy absorption, so as to reduce the transmission of vibration toward automobile body. The method can also adjust the frequency of vibration damping and energy absorption devices by adjusting the mass of the mass block and the vertical rigidity of the elastic damping system. The inventive method has the advantages of simple structure and not remarkably increased weight and cost, and can maximally damp transmission of the vibration toward the automobile body.

The invention provides an electromagnetic damping shock absorber which is characterized by comprising a rubber shock damping cylinder, a metal diamagnetic circular tube, three permanent magnets and springs, wherein the metal diamagnetic circular tube is sleeved and fixed in the rubber damping cylinder; the three permanent magnets are placed in the metal diamagnetic circular tube from top to down with intervals; the springs are pressed among the permanent magnets; an end cover is fixed at two ends of the rubber damping cylinder; certain clearances are arranged between the two ends of the metal diamagnetic circular tube and the end covers; the magnetism properties of the adjacent ends of adjacent permanent magnets are the same; the permanent magnet positioned in the middle is fixedly connected with the metal diamagnetic circular tube through a bolt; coil supports are fixed on an upper end surface and a lower end surface of the permanent magnet; enclosed induction coils are wound on the coil supports; the coil supports and the induction coils are all not contact with the adjacent permanent magnets; the center of each end cover and the center of each permanent magnet are all provided with penetrated bolt holes; and the bolt holes, the springs and the coil supports are coaxial. The shock absorber has the advantages that the shock absorber has favorable damping properties, can convert mechanical energy into electric energy to utilize, and has adjustable resistance, the energy can be recycled, and the controllability is good and the like.

The invention discloses an elastomer dynamic response and vibration control test system under time varying load effect, which comprises a test bed, a motion generating and controlling device, a piezoelectric sensor, a displacement and speed sensor, a multi-channel charge amplifier, a data collecting device, a display device, a multi-channel piezoelectric ceramic drive power supplier and a piezoelectric actuator; wherein the motion generating and controlling device leads a mass block to move on the cantilever beam of the test bed; the data collecting device collects data of the sensor and sends the data to the display device for displaying by a communication module, and the data collecting device outputs a controlling voltage to the multi-channel piezoelectric ceramic drive power supply after processing the collected data according to an instruction obtained by the display device; the multi-channel piezoelectric ceramic drive power supply controls the voltage for amplifying and applies the voltage to the piezoelectric actuator for suppressing beam vibration. The invention integrates controlling and data collecting into a whole, either the forced vibration or the free vibration can be quickly suppressed and damping effect is obvious.

The invention provides a micro-vibration convergence type vibration isolation device used for a satellite flywheel. The micro-vibration convergence type vibration isolation device comprises an upper platform, linings, lower joint pieces, a lower platform, fixed pieces, damping layers, movable pieces, vibration isolators and upper joint pieces. Three trapezoid corners which are evenly distributed are arranged on the upper platform in the circumferential direction, and a plurality of first apertures with the diameter of 3.3 mm are formed in the trapezoid corners and used for being connected with the upper joint pieces. Three grooves which are evenly distributed and used for being connected with the lower joint pieces are formed in the lower platform in the circumferential direction. The upper joint pieces, the vibration isolators, the movable pieces, the damping layers, the fixed pieces and the linings are combined to form three vibration isolator assemblies, the three axes of the three vibration isolator assemblies are converged at one point, and the convergence point is located above the upper platform. The upper platform and the lower platform are connected through the lower joint pieces and the vibration isolator assemblies. The damping layers are clamped between the fixed pieces and the movable pieces. The micro-vibration responses caused when the flywheel operates on orbit can be remarkably reduced, and the stability, reliability and safety of the high-accuracy sensitive load on a satellite are ensured.

The invention discloses a variable inertial mass hydraulic damper comprising a first vibration acting end (1), a valve (2), a second vibration acting end (3), a hydraulic cylinder (4), a flowmeter (5), a hydraulic motor (6), a flying wheel (7) and an electro-hydraulic adjusting valve (8), wherein the first vibration acting end (1) is connected with a piston rod of the hydraulic cylinder (4); the shell of the hydraulic cylinder (4) is connected with the second vibration acting end (3); two ends of the hydraulic motor (6) are connected with two ends of the hydraulic cylinder (4) to form a structure that the hydraulic cylinder (4), the hydraulic motor (6) and the electro-hydraulic adjusting valve (8) are connected in parallel; the valve (2) is arranged on a hydraulic pipeline; the flowmeter (5) is arranged on a hydraulic pipeline of the hydraulic motor (6); and the flying wheel (7) is connected with the output end of the hydraulic motor (6). The variable inertial mass hydraulic damper has simple structure, light weight, power energy source saving, low heating amount and favorable damping performance.

The invention discloses a bearing retainer and a machining technique thereof. The technique mainly comprises: blanking perimeter and height required by the retainer at a time, moulding all cage pocketstructures of the retainer at a time, and punching all the cage pockets into concave cage beams provided with groove structures at a time; circling the retainer bracket with circling mould, and welding the butt ports of two ends of the circle to form an integral bearing retainer structure. The machined bearing retainer bracket is in the integral bearing retainer structure formed by manufacturinginner and outer ring beams, cage pockets, concave cage beams between adjacent cage pockets, and boundary beams for connecting the concave cage beams to the space between the inner and outer ring beamswith the same mild steel plate through the previous technique so that the invention has the advantages of reducing accumulated technique deviations, improving precision and reliablity of products, solving the problem of high cost of material waste in conventional bearing machining technique, fully increasing the utility rate of material, and further improving the production efficiency of the bearing retainer.

The invention discloses a self-powered vehicle vibration damping device which comprises a vibration damping device body and a vibration damping device controller, wherein the vibration damping device body comprises a first cylinder body, a piston rod, a piezoelectric generating unit, a transmission force spring unit, a magneto-rheological damping unit and an electromagnetic induction unit; the piezoelectric generating unit comprises a plurality of piezoelectric modules, and a plurality of piezoelectric vibrators are inlaid in each piezoelectric module; the transmission force spring unit comprises an upper spring pressing plate, a lower spring pressing plate, a lower spring clamping seat, an upper spring clamping seat and a transmission force spring; the magneto-rheological damping unit comprises an outer cylinder, an inner cylinder, a permanent magnet protecting cover, an upper damp channel, a lower damp channel, a magnet exciting coil and a piston; and the electromagnetic induction unit comprises a leakage-proof magnetic sleeve, a second cylinder body, a permanent magnet and an electromagnetic induction coil. The invention further discloses a control method for the self-powered vehicle vibration damping device. The self-powered vehicle vibration damping device provided by the invention is high in energy-regenerative efficiency, good in work stability, high in reliability, can adjust the damping force in real time, and ensures that a vehicle is in an optimal vibration damping state.

A multiple clutch device which includes a drive unit, a downstream transmission connected to a drive shaft of the drive unit and accommodated in a clutch bell that does not co-rotate with the drive shaft, two wet multi-plate clutches, which include a plate support at the input and output end and plates alternating axially, and an actuation mechanism. A housing of the actuation mechanism is supported on the clutch bell, and the plate support at the input end of at least one of the multi-plate clutches is connected to the housing by a supporting metal sheet or a supporting pot and a footstep bearing such that a flow of an actuation force generated by the actuation mechanism is redirected to the housing of the actuation mechanism via the supporting metal sheet or the supporting pot and the footstep bearing, creating a closed force flow within the device.

The invention belongs to the technical field of alloy materials and discloses a polyethylene terephthalate (PET)/polycarbonate (PC) alloy material as well as a preparation method and application thereof. The PET/PC alloy material comprises the following components in parts by weight: 5-40 parts of PET, 50-85 parts of PC, 4-30 parts of a flexibilizer, 4-30 parts of a compatilizer, 0.1-4 parts of an ultraviolet-resistant agent and 0.1-2 parts of a stabilizer. The prepared PET/PC alloy material has excellent characteristics of vibration reduction, low-temperature impact resistance and fatigue resistance; the tensile strength is 75.6MPa, and the bending strength is 120.6MPa. The PET/PC alloy material is easily processed and molded, can be used for preparing high-performance whole steel rail concealed parts and is applied to urban rail transit.

The invention discloses a variable mass dynamic vibration absorber control method. A sensor used for collecting main system input and output vibration signals is arranged on a compound system composed of a main system-variable mass dynamic vibration absorber, and when the minimum inherent frequency omega m and the maximum inherent frequency omega n of the variable mass dynamic vibration absorber are used respectively, an amplitude-frequency response curve of a main system in the frequency range (0,omega t] is formed; as for the variable mass dynamic vibration absorber control method, while the main system works, the main system vibration signals are collected through the vibration sensor, and excitation frequency omega exerted by the external world is calculated through fast Fourier transform; the variable mass dynamic vibration absorber is controlled according to the value of the excitation frequency omega. According to the variable mass dynamic vibration absorber control method, the effective vibration reduction frequency band of the vibration absorber can be effectively broadened, the phenomenon of resonance of the main system after the vibration absorber is installed can be eliminated, and performance of the vibration absorber is more stable. No control system or actuator needs to be additionally arranged, and the variable mass dynamic vibration absorber control method is easy to achieve and has good practical value.