125results about How to "Improve damping effect" patented technology

Disclosed herein is a focal length adjustment apparatus in which a magnetic fluid that serves as attenuation means is injected between a magnet and a coil to achieve an improvement in a magnetic flux density and damping effect. The apparatus comprises a moving unit including a lens barrel that contains at least one lens therein, and a coil arranged on an outer circumference of the lens barrel, a fixed unit including a yoke formed with an opening for receiving the lens barrel, a case into which the yoke is inserted and mounted, and a magnet affixed to the yoke to be arranged adjacent to the coil, a supporting member used to elastically support the moving unit relative to the case, and attenuation means interposed between the coil and the magnet to attenuate vibration of the moving unit.

There are provided a TMD adjusted to damp vibration in a natural frequency of a wind turbine, an AVC adjusted to damp vibration in a variable frequency of turbulent wind flowing into the wind turbine and/or a frequency of a rotation speed of a wind-turbine blade, and a pitch-angle control portion provided with a correction portion which adjusts a damping frequency of the AVC. The AVC is configured to obtain the damping force by changing the pitch angle of the wind-turbine blade.

The invention discloses a microporous polyurethane elastomer shock absorption element for a high-speed railway. The shock absorption element is characterized by being prepared by stirring and mixing a mixture I and a quasi-prepolymer II at the temperature of between 35 and 55 DEG C for 2 to 5 minutes to obtain a mixture, wherein the mixture I consists of the following components in part by weight: 23 to 40 parts of polyether polyol A, 5 to 10 parts of chain extender, 0.1 to 0.5 part of water, 0.2 to 0.55 part of silicone oil foam homogenizing agent and 0.15 to 0.3 part of catalyst, and the quasi-prepolymer II is prepared by reacting 2.5 to 8 parts of modified nanokaolin, 24 to 30 parts of polyether glycol and 30 to 40 parts of polyisocyanate; pouring the mixture into a die which is pre-heated to 45 to 70 DEG C and is coated with a de-molding agent for molding, de-molding, and curing at the temperature of between 80 and 100 DEG C for 10 to 20 hours. The indexes of the shock absorption element meet the requirements of the HE/3328-2006 standard.

The invention discloses a metallic cryogenic tempering method for improving milling stability. The method includes: (a), assembling a liquid nitrogen cooling nozzle, synchronously moving with a milling machine spindle and an end mill, to the milling machine spindle and the arranged end mill; (b), executing climb milling under the condition of cryogenic cooling, and performing experiment calculation to obtain cutting force coefficients of tangential milling force coefficients, tangential cutting edge force coefficients, radial milling force coefficients, radial cutting edge force coefficients and the like; (c), executing hammer test on a point of a milling cutter, acquiring a corresponding displacement frequency response function based on test result fitting, and extracting modal parameters such as modal mass, modal damping and modal stiffness; (d), constructing a two-degree-of-freedom milling dynamics equation, then predicating stability boundaries in the metal milling process based on the dynamics equation, and correspondingly adjusting the milling parameters. By the method, the problems of cutting heat and cutting process system unstability can be solved comprehensively, and the maximum chatter-free material removal rate of cryogenic tempering is significantly increased.

The invention discloses an optimization criterion method based constraint damping plate topological optimization method to solve the problem of optimization arrangement of constraint damping materials of a constraint damping plate. The optimization criterion method based constraint damping plate topological optimization method specifically comprises interpolating the constraint damping materials through an SIMP model and establishing a topological optimization model of the constraint damping plate; establishing a finite element model of the constraint damping plate, performing modal analysis on the finite element model, calculating the sensitivity of constraint damping cell units according to a sensitivity calculation formula, solving the topological optimization model through an optimization criterion method and obtaining a topological optimization construction of the constraint damping plate. According to the optimization criterion method based constraint damping plate topological optimization method, structural vibration response is effectively reduced and the utilization ratio of the constraint damping materials is improved by optimizing the arrangement of the constraint damping materials under the condition that certain constraint damping materials are added.

The invention discloses a glass fiber reinforced polyester mineral composite material and a preparation method thereof, which belong to the technical filed of composite materials. The glass fiber reinforced polyester mineral composite material comprises an adhesive substrate, an aggregate and a glass fiber, and is prepared by the steps of evenly mixing the adhesive substrate, the aggregate and the glass fiber, casting and curing the mixture, and the like, wherein the mass fraction of the adhesive substrate is 9 to 20 percent; the mass fraction of the aggregate is 79 to 90 percent; and the mass fraction of the glass fiber is 0.1 to 1 percent. The composite material has excellent damping property and physical and mechanical properties, improves the compressive strength by 15 to 25 percent compared with a polyester mineral material without reinforced fiber, improves the damping ratio by 9.5 to 23 percent, and can be used as an excellent mechanical basic element material.

The invention discloses an inorganic damping composite material and a preparation method thereof. The material is prepared from the following components in parts by weight: 100 parts of inorganic material matrixes, 10-150 parts of piezoelectric filler, 1-50 parts of conductive filler and 1-50 parts of auxiliaries, wherein the inorganic material matrixes include cement, glass, ceramics and asphalt; the piezoelectric filler is piezoelectric ceramic with the average particle size ranging from 100nm to 100um; the conductive filler is an organic carbon compound; and the components are cured and formed according to the proportions to obtain the inorganic damping composite material. The inorganic damping composite material provided by the invention has a better damping effect, can be used for effectively eliminating noise, and can be widely applied to fields such as traffic transportation, large buildings, medical hygienic materials and the like.

A torsional vibration damper with a damper component and a damper flange part limitedly rotatable within a circumferential clearance with respect to the damper component contrary to the effect of energy accumulator elements. The damper component is formed as a guide shell radially outside and surrounds the radial outmost circumferential section of the energy accumulator elements. The damper flange part comprises circumferentially disposed compression elements. The energy accumulator elements are circumferentially arranged in-between the compression elements. Cutouts formed in the guide shell and the compression elements engage radially into the cutouts whilst facilitating circumferential clearance.

This invention relates to a composition for plug in a base-isolated structure capable of providing a plug for base-isolated structure having sufficient damping performance, displacement following property and the like, and more particularly to a composition for plug in a base-isolated structure characterized by including powder and an elastomer composition formed by compounding an elastomer component with a reinforcing filler.

The invention discloses a mass center adjustable mixed type vibration damping platform. The mass center adjustable mixed type vibration damping platform comprises top platforms, a bottom platform, vibration damping units and mass center adjusting units, the plurality of vibration damping units are obliquely arranged between the top platforms and the bottom platform, one mass center adjusting unitis arranged between each vibration damping unit and the top platform, and the mass center adjusting units and the vibration damping units are arranged in the same axial direction; the mass center adjusting units comprise upper screw rods, sleeves and connecting rods, through holes are axially formed inside the sleeves, each of the top and the bottom of each through hole is provided with a thread section, the top ends of the upper screws are connected with the top platforms, the bottom ends of the upper screws are in threaded connection with threaded sections at the tops of the through holes, the top ends of the connecting rods are in threaded connection with the threaded sections at the bottoms of the through holes, and the bottom ends of the connecting rods are connected with the vibration damping units. The mass center adjusting units can realize platform mass center adjustment and pose adjustment, so that the mass center of a rigidity center and the mass center of a vibration damping system (including a vibration damping object and a rigid pedestal) are arranged on the same vertical line, and the vibration damping and vibration isolation effect can be greatly enhanced.

The invention discloses a display device built-in passive sound box and a displayer, and relates to a sound box device. The display device built-in passive sound box can reduce the volume of the sound box and improve low-frequency effect. A miniature enclosed loudspeaker is characterized by comprising a sound box, a loudspeaker single unit, a first passive radiation part and a second passive radiation part, wherein the loudspeaker single unit is arranged in the sound box, and a diaphragm of the loudspeaker single unit is positioned on a first surface of the sound box; the first passive radiation part is arranged on the first surface; the second passive radiation part is arranged on the second surface of the sound box; the second surface is opposite to the first surface; and the first passive radiation part and the second passive radiation part can buffer sound pressure generated by loudspeaker parts in the sound box. The invention discloses the displayer provided with the built-in passive sound box. The display device built-in passive sound box and the displayer are suitable for the field of sound box manufacture.

The invention provides a double-resonance fluid pulsation attenuator which comprises a shell. A piston cavity is arranged in the shell, a first piston is slidably arranged in the piston cavity, the piston cavity is divided into a first cavity and a second cavity, and a first pressure spring which can push the first piston is arranged in the second cavity; a first through hole and a second through hole are formed in the shell, the first through hole is communicated with the first cavity, and the second through hole is communicated with the second cavity. First overflow gaps are reserved between the side walls of the first piston and the piston cavity. A first groove is formed in the side, which faces the first cavity, of the first piston, a second piston and a second pressure spring are slidably arranged in the first groove, and the second pressure spring can push the second piston. Second overflow gaps are reserved between the second piston and the side walls of the first groove. A damping hole is formed in the first piston, and the first groove can be communicated with the second cavity via the damping hole. The double-resonance fluid pulsation attenuator has the advantages that the double-resonance fluid pulsation attenuator is simple in structure and is small and light, effective vibration damping frequency widths can be greatly enlarged by the double-resonance fluid pulsation attenuator in a double-resonance flow pulsation eliminating design as compared with a single-resonance vibration damper, and excellent vibration damping effects can be realized for flow pulsation in hydraulic pipelines.

According to the invention, there is provided a damping structure capable of obtaining a sufficient damping effect even against vibrations of small amplitudes, by promoting movements of powder/particle materials inside a hollow body. In the damping structure of the invention, a damping member 2 is provided on a structure 1 to be damped. The damping member 2 includes a hollow body 5 which is filled with powder/particle materials 3, partially leaving a space 4. A vibration wall face part 7 which vibrates more violently than the structure 1, on receiving vibration, is formed in at least a part of wall face parts 6 of the hollow body 5. The vibration wall face part 7 is preferably formed of a material having a lower elastic modulus and/or a lower density than the other parts.

The invention relates to a braking force generator (10), for a hydraulic vehicle braking system, comprising a force introduction member (14), which is or may be coupled to a brake pedal (P) and which may be mounted in a base housing of the brake force generator (10), a main brake cylinder, in which a primary piston (64), for generation of a hydraulic braking pressure, runs in a displaceable manner, a pedal counter-force simulation device (106), coupled to the force introduction member (14), a pedal operation recording device (150), for recording a pedal operation and an operation force generation device, for exerting an operating force on the primary piston (64), whereby the operating force generation device comprises a control valve (22), a chamber arrangement (16) and an electromagnetic actuator (48). The chamber arrangement (16) is embodied with a vacuum chamber (30) and a working chamber (32), separated from the vacuum chamber (30) by a moving wall (28), in fluid connection to each other by means of the control valve (22) and the control valve (22) is operated according to the recorded pedal operation.

The invention discloses a biobased micro-porous polyurethane material and a preparation method thereof. The method comprises a component A preparation process, a component B preparation process and a component A and component B mixing process, wherein the component A preparation process comprises the following steps: stirring 20 to 41 parts by weight of polyether polyol, 3 to 11 parts by weight of chain extender, 0.01 to 0.52 part by weight of water, 0.15 to 0.59 part by weight of silicone oil, and 0.12 to 0.33 part by weight of catalyst for not less than 5 minutes; and degassing under a negative pressure condition until the degree of vacuum does not change any more, and sealing for storage. Compared with the prior art, according to the invention, a pre-polymer method is adopted, MDI (diphenylmethane diisocyanate) with low price, good prepolymer stability and short production period and biobased polyether polyol with environmental friendliness and regenerability are preferably used for preparing a micro-porous elastic body, thus environmental friendliness and use performance are taken into consideration, and the market developing space is great.

The invention provides a vibration-absorbing silicone gel composition mainly comprising: 100 parts by weight of (a) an organopolysiloxane having a (meth)acryloyl group in its molecule; from 5 to 100 parts by weight of (b) an organopolysiloxane unreactive with ingredient (a); from 1 to 50 parts by weight of (c) an amorphous pulverization product of a three-dimensionally crosslinked silicone resin; from 1 to 20 parts by weight of (d) a fumed silica; and an effective amount of (e) a polymerization initiator, as a gel composition which has high vibration-absorbing properties and high shape retention and which can be used as, e.g., a vibration-absorbing damper even when it is not sealed up in a container or bag.

The invention discloses a precise rotating, aligning and pre-pressing execution mechanism of a bonder and solves the problem that existing bonding rotating positioning mechanisms are low in stabilityand aligning accuracy. A pressing-down rotating spline shaft (3) is movably arranged in a rotating bearing (4), an adsorption head mechanism (2) is arranged at the lower end of the pressing-down rotating spline shaft (3) below the rotating bearing (4), the upper end of the pressing-down rotating spline shaft (3) above the rotating bearing (4) is connected with a rotatable output shaft of a rotatable pre-pressing cylinder (16), a screw module (14) moving horizontally is fixedly arranged on the vertical face of an inverted-L-shaped mounting plate (19), a rotating cantilever swing rod (6) is fixedly connected on the pressing-down rotating spline shaft (3) above the rotating bearing (4), a pin shaft and a cam driven bearing (7) are fixedly arranged on the upper end face of the outer side of the rotating cantilever swing rod (6), and the cam driven bearing (7) and a push rod (8) are in movable leaning-against connection. Rotating positioning accuracy is improved.

The invention provides a hydraulic bushing, comprising: a mandrel; a first runner member sleeving the mandrel and in sleeve shape, wherein a gap between the mandrel and the first runner member is filled with first rubber, the outer surface of the first runner member is provided with a first runner for a hydraulic fluid, the first rubber is radially oppositely provided with two main fluid cavitiesto hold the hydraulic fluid, and the two main fluid cavities are communicated with each other via the first runner; an outer sleeve that sleeves the first runner member radially in compressing manner;and a sealing component arranged on the at least one axial outer side of the first runner member, wherein the sealing component and the outer sleeve jointly define an auxiliary fluid cavity to hold the hydraulic fluid. The sealing component includes a support ring sleeving the mandrel; the support ring includes a radial protrusion inside the auxiliary fluid cavity; the radial protrusion is in hermetic contact with the inner surface of the outer sleeve so that the auxiliary fluid cavity is divided into a first sub-cavity on the axial outer side and a second sub-cavity on the axial inner side.

The invention discloses an intelligent sealing device for ship tail shaft numerical control magnetic fluid. According to the main structure of the intelligent sealing device, a stuffing box is arranged at the sealed part of a tail shaft, one end of the box is provided with a gland, and the other end of the box is connected with a sternpost through a flange. Two layers of PTFE ring box sleeves are arranged in the middle of the box in parallel, and nx twelve radial hedging magnetic sector permanent magnets are embedded in each layer of box sleeve. Magnetic fluid circulating cavities are formed between the box sleeves in which the magnets are embedded and a shaft tube. The two sides of each permanent magnet box sleeve are each provided with a stainless steel circular ring and provided with eight magnetic fluid injecting or discharging holes, wherein the outer sides of the two stainless steel circular rings are each provided with a stainless steel clamping ring. An AH type metal framework teflon sealing ring is clamped on a tail shaft tube. An MCU is arranged, a magnetic fluid input pump and an electromagnetic overflow valve are controlled according to the pressure and temperature sensor information, the pressure in the magnetic fluid circulating cavities and the pressure at the draft of a warship and a submarine can be randomly the same, sealing, lubricating and cooling functions are achieved on the tail shaft tube through circulation of pressurized cold and hot magnetic fluid, and an electromagnetic sealing brake is arranged for strengthening static sealing of the tail shaft tube during downtime.

The invention relates to a preparation method for chlorinated butyl damping rubber containing a modified montmorillonite damping agent. The preparation method comprises the following five steps: preparation of organic modified montmorillonite; hydroxyl group protection of 4-allyl-2,6-dimethoxyphenol; preparation of 4-allyl-2,6-dimethoxyanisole modified montmorillonite; elimination of hydroxyl group protection of4-allyl-2,6-dimethoxyanisole modified organic montmorillonite; and preparation of the chlorinated butyl damping rubber containing the modified montmorillonite damping agent. Compared with the prior art, the preparation method provided by the invention improves the damping vibration attenuation effect of a rubber material. The preparation method is economic, practical and simple, has low cost, can easily realize large-scale production and has practicality.

In a hydraulic chain tensioner having a housing, a hollow plunger slidable in a plunger-accommodating hole in the housing, and a hollow sleeve extending into the plunger from a bottom of the plunger-accommodating hole, and a check valve mounted at the opposite end of the sleeve, a passage is provided on the outer surface of the sleeve to accelerate the balance of pressure between a first high pressure chamber between the check valve and the protruding end of the plunger and a second high pressure chamber between the inner end of the plunger and the bottom of the plunger-accommodating hole. In an alternative embodiment, balance is accelerated by communication between the second high pressure chamber and an oil reservoir inside the sleeve on the upstream side of the check valve.

The invention discloses a glass fiber and carbon fiber mixed reinforced polyester mineral composite material and a preparation method thereof, which belong to the technical filed of composite materials. The glass fiber and carbon fiber mixed reinforced polyester mineral composite material comprises an adhesive substrate, an aggregate, a glass fiber and a carbon fiber, and is prepared by the steps of evenly mixing the adhesive substrate, the aggregate, the glass fiber and the carbon fiber, casting and curing the mixture, and the like, wherein the mass fraction of the adhesive substrate is 9 to 20 percent; the mass fraction of the aggregate is 79 to 90 percent; and the sum of mass fractions of the glass fiber and the carbon fiber is 0.1 to 1 percent. The composite material has excellent damping property and physical and mechanical properties, improves the compressive strength by 25 to 35 percent compared with a polyester mineral material without reinforced fiber, improves the damping ratio by 8.5 to 21 percent, and can be used as an excellent mechanical basic element material.

The invention relates to a pipe type variable-damping filter provided with multiple holes with different parameters and applied to the opening of a hydraulic pump. The pipe type variable-damping filter provided with the multiple holes with different parameters and applied to the opening of the hydraulic pump is composed of a main shell, a small linear motor, a sliding baffle, a first sealing ring, a second sealing ring and an oil cavity shell, wherein a rectangular flange is arranged on the main shell, the oil cavity shell is installed on the rectangular flange of the main shell, a cuboid oil cavity is formed by the oil cavity shell and the main shell, the five oil damping holes are formed in the middle of the upper portion of the main shell in the oil cavity and are arranged in the axial direction of the filter, the distances between the oil damping holes are the same, the diameters of the holes become larger gradually, the small linear motor is installed on the main shell, a stretching-out shaft of the small linear motor is hinged to a push rod of the sliding baffle, a round channel is formed in the side wall of the main shell, the push rod of the sliding baffle penetrates through the channel, a circulating hole is formed in the sliding baffle, the diameter of the circulating hole is the same as that of the biggest oil damping hole in the main shell, and the small linear motor is controlled through a current amplifier and a control amplifier. By the adoption of the pipe type variable-damping filter provided with the multiple holes with different parameters and applied to the opening of the hydraulic pump, the range of the damping frequency can be widened.

The invention relates to a vibration-reducing damping part. The vibration-reducing damping part comprises vibration-reducing damping part rubber and an aluminum foil, and the vibration-reducing damping part rubber is arranged on the aluminum foil in a laminated mode. The vibration-reducing damping part rubber is prepared from, by mass, 20%-30% of butyl rubber, 10%-15% of polyisobutene, 30%-40% of pottery clay, 4%-8% of terpene resin, 20%-30% of calcium carbonate and 3%-8% of paraffin oil. The vibration-reducing damping part has the advantages of being good in flame-retardant and damping effects, good in flatness, not prone to generate bubbles, low in cost and good in tensile strength, tearing strength and wear-resisting property.

The invention discloses a rub-impact damping protection device for a high-speed rotating machinery, comprising an upper cover plate, a lower cover plate, a housing, a slide block, a rub-impact ball head and a metal rubber ring, wherein both the housing and the slide block are ring-shaped; an upper through hole is arranged at the middle part of the upper cover plate; a lower through hole is arranged at the middle part of the lower cover plate; the upper end of the housing is fixedly connected with the upper cover plate; the lower end of the housing is fixedly connected with the lower cover plate; the slide block is arranged in the housing and is embed between the upper cover plate and the lower cover plate; a gap is reserved between the slide block and the housing; the metal rubber ring is placed in the gap; the rub-impact ball head is arranged on the inner wall of the slide block; the head part of the rub-impact ball head is toward the axis of the slide block; and the distance from the head part of the rub-impact ball head to the axis is respectively less than the radius of the upper through hole and the radius of the lower through hole. When playing a limit role on the rotation of a rotor, the rub-impact damping protection device with the structure also has a performance of strong damping effect and is beneficial to enhancing the safety of the operation of a rotor system.