1228results about How to "Good vibration reduction effect" patented technology

It is an object of the present invention to provide a power tool having a further improved vibration reducing performance. The representative power tool may comprise a tool bit, an actuating mechanism, a dynamic vibration reducer. The actuating mechanism drives the tool bit linearly by means of pressure fluctuations so as to cause the tool bit to perform a predetermined operation. The dynamic vibration reducer has a weight that reciprocates under a biasing force of an elastic element to reduce vibration of the actuating mechanism. The weight may be driven by means of pressure fluctuations caused in the actuating mechanism. According to the invention, the weight of the dynamic vibration reducer can be actively driven by pressure fluctuations in the actuating mechanism for driving the tool bit. Therefore, regardless of the magnitude of vibration acting on the power tool, the dynamic vibration reducer can be forcedly and steadily operated.

It is an object of the present invention to provide a power tool having a further improved vibration reducing performance. The representative power tool may comprise a tool bit, an actuating mechanism, a dynamic vibration reducer. The actuating mechanism drives the tool bit linearly by means of pressure fluctuations so as to cause the tool bit to perform a predetermined operation. The dynamic vibration reducer has a weight that reciprocates under a biasing force of an elastic element to reduce vibration of the actuating mechanism. The weight may be driven by means of pressure fluctuations caused in the actuating mechanism. According to the invention, the weight of the dynamic vibration reducer can be actively driven by pressure fluctuations in the actuating mechanism for driving the tool bit. Therefore, regardless of the magnitude of vibration acting on the power tool, the dynamic vibration reducer can be forcedly and steadily operated.

A three-dimensional knit fabric having front and back knit layers and a monofilament yarn connecting the knit layers to each other, characterized in that the curvature of the monofilament yarn in the three-dimensional knit fabric is in a range from 0.01 to 1.6, and the bending elongation of the monofilament is 20% or less when the three-dimensional knit fabric is compressed to 50%. The three-dimensional knit fabric has a cushioning property in springiness which does not deteriorate even if the fabric is repeatedly used many times or for a long time, and thus this fabric is excellent in terms of durability of the cushioning property. In particular, the fabric is suitable for use as a hammock type seat and exhibits a cushioning property having a favorable springy feeling as well as a good fit feel.

A vibration damping rubber bushing that has excellent vibration damping property and anticorrosive property, can strongly fix to a supporting component, and has excellent fall off-preventing property in using the same. The vibration damping rubber bushing includes an inner sleeve, an outer sleeve, and a rubber elastic body interposed between the inner sleeve and the outer sleeve, the inner sleeve, outer sleeve and rubber elastic body being integrally formed, wherein a coating film of an aqueous paint including an amino-modified epoxy resin as a binder is formed on a circumference of at least the outer sleeve selected from the inner sleeve and the outer sleeve.

The invention discloses a magnetic liquid damping vibration attenuation device which is suitable for longer object vibration attenuation in a spacecraft and can be used for solving the vibration attenuation problem of longer object vibration attenuation in the spacecraft. The magnetic liquid damping vibration attenuation device comprises an end closure (1), a magnetic liquid (2), a non-magnetic-conductive shell (3) and a permanent magnet (4), wherein the permanent magnet (4) is installed in the cavity of the non-magnetic-conductive shell (3), the magnetic liquid (2) is injected into the cavity of the non-magnetic-conductive shell (3) and the end closure (1) is used for sealing. The device is very sensitive to the inertia force, the adopted end closure (1) with threads is provided with a taper angle, the taper angle is 140degrees -170degrees, the depth of the end closure screwed into the non-magnetic-conductive shell (3) can be adjusted so as to regulate the pressure applied to the magnetic liquid by the end closure (1), the permanent magnet is a cylinder, the vibration attenuation effect is good for the vibration with low frequency, small displacement and small acceleration characteristics.

A handle assembly for a power tool 1 comprises a housing 2 defining a handle 4 and housing a motor for actuating an output member of the tool, such as a drill bit or jigsaw blade. The handle assembly comprises at least one flexible sheet 8 adapted to be mounted to a surface of the handle of the power tool and having a series of protrusions 10 adapted to be engaged by a hand of a user of the tool. The protrusions 10 retain one or more blister packs (not shown) containing at least one vibration damping gel material between the flexible sheet 8 and the surface of the handle 4.

The invention relates to a nonlinear rail type collaborative tuning damper which comprises an external cavity unit, a spring system, a viscous liquid, an internal cavity unit, a cushioning material and a particle group. Two groove rails which are arranged in the length direction of the cavity are arranged at the bottom of the damper external cavity unit, the internal cavity unit can slide back and forth along the groove rails and is connected with the inner wall of the external cavity through the spring system, the portion between the external cavity unit and the internal cavity unit is filled with the viscous liquid, the inner wall and bottom of the internal cavity are covered with the cushioning material, and the particle group is composed of circular particles with different sizes. Shaking of the viscous liquid enables the internal cavity to move back and forth to consume energy, and friction and collision of the liquid and the container wall provides the damping effect; the structure self-vibration frequency is tuned by the spring system, and the energy is consumed by means of the collision and friction between the particles or between the particles and the cavity wall. According to the nonlinear rail type collaborative tuning damper, the advantages of various dampers are combined, the vibration damping frequency band is wide, the effect is good, and the nonlinear rail type collaborative tuning damper has wide applicability in the field of civil engineering structure vibration control.

The invention discloses a variable-rigidity and variable-damping tuned mass damper, which is mainly applied to vibration control over multi-frequency structures such as high-rise buildings or long-span bridges, ocean platforms and the like. The tuned mass damper comprises a mass block, wherein a vertical spring is connected to the upside of the mass block in a vertical direction, and magnetorheological dampers are respectively arranged on the mass block in a horizontal direction and a vertical direction; and a cantilever spring is arranged horizontally and longitudinally, one end of the cantilever spring is connected with the mass block, the other end of the cantilever is connected with a traveling mechanism. Two ends of the traveling mechanism are placed on a rigid guide rail, and the traveling is driven by a stepping motor to move longitudinally. The length of the cantilever spring is regulated by the movement of the stepping motor, so that the tuning frequency of the tuned mass damper is further regulated; and by regulating currents of the magnetorheological dampers to change the damping ratio of the tuned mass damper, the rigidity and the damping are regulatable continuously, so that the vibration control in the vertical direction and the horizontal direction. The variable-rigidity and variable-damping tuned mass damper disclosed by the invention has a clear working principle and has the advantages of easiness for realizing semi-active control property, good damping effect, fast response, high precision and the like in engineering application.

The invention discloses a magnetorheological torsional vibration damper for an engine. The damper is characterized in that: an inertia disc is arranged in an annular shell; an antifriction lining is arranged at the outer end of the inner circumference of the annular shell, and the inertia disc can rotate freely around the antifriction lining in the annular shell; a conductive coil is arranged in the inertia disc; magnetorheological fluid is filled in a gap between the annular shell and the inertia disc; a lead wire is connected with the antifriction lining; and the lead wire is exported from the center of the damper through an insulating conduit of the annular shell. By utilizing the characteristic that the conductive coil is electrified and generates a magnetic field to control flowing of the magnetorheological fluid, the rotation damping force of the damper can be adjusted, so that the defect that the damping coefficient of the traditional silicone oil torsional vibration damper can only be a single damping coefficient is overcome. The external magnetic force is changed by changing the volume of current, so that the damping characteristic of the magnetorheological fluid is changed. Therefore, the magnetorheological torsional vibration damper has excellent damping effect when a crankshaft is resonant, and has better damping effect than that of the silicone oil damper under other frequencies.

The invention discloses an electromagnetism and magnetorheological fluid mixed shock absorber which can realize active control, is low in energy consumption and can recover energy. The electromagnetism and magnetorheological fluid mixed shock absorber comprises an upper shell and a lower shell which are connected together; an intermediate connecting plate is arranged at the connecting part of the two shells; a piston rod penetrates into the two shells and is connected with a piston body after penetrating through the intermediate connecting plate; the upper shell and the piston body are internally provided with an electromagnetic device respectively; the two electromagnetic devices are both connected with a control unit, and the control unit is connected with a signal end of a sensor; the lower shell at the lower part of the piston body is internally provided with a moving piston; a magnetorheological fluid cavity is respectively arranged between the piston shell of the piston body and the intermediate connecting plate and between the piston shell of the piston body and the moving piston, and the two magnetorheological fluid cavities are communicated by a communicating structure of the piston body; and a nitrogen cavity is arranged between the moving piston and the lower shell. The electromagnetism and magnetorheological fluid mixed shock absorber combines the advantages and disadvantages of the magnetorheological fluid semi-active control and the magnetism active control of the shock absorber, and has the advantages of being good in shock absorbing effect, low in energy consumption and recoverable in energy.

The invention discloses a joint arm of a cloth arm bracket and a manufacturing method thereof and also relates to a concrete conveying machine provided with the joint arm. The joint arm of the cloth arm bracket comprises a transverse plate and a vertical plate, wherein in the longitudinal direction, the transverse plate and the vertical plate extend along the same direction; in the transverse section, the transverse plate extends horizontally, and the vertical plate extends vertically; the side of the vertical plate has flanging, and the side of the vertical plate and the horizontal flanging are fixed with the transverse plate; and the transverse plate and the vertical plate are respectively provided with a composite material layer which comprises resin and fiber. The joint arm can maintain less weight while ensuring higher strength and fatigue resistance, and also can reduce the adverse effect for the joint arm caused by welding; furthermore, the joint arm provided by the invention also has damping performance and corrosion resistance, thus prolonging the service life of the joint arm.

A fluid-filled vibration damping device including: an elastic body connecting a first and a second mounting member, defining a pressure receiving chamber undergoing pressure fluctuation during input of vibration; an equilibrium chamber defined by a flexible layer for permitting its volume change; a first orifice passage connecting the pressure receiving chamber and equilibrium chamber; a medial chamber disposed between the pressure receiving chamber and equilibrium chamber; a second orifice connecting the pressure receiving and medial chambers, being tuned to a frequency higher than does the first orifice passage; a pressure fluctuation transmitting mechanism disposed between the pressure receiving and medial chambers for a restricted pressure transmission between chambers by restrictive displacement of its movable member; and a pressure regulating rubber plate defining the medial chamber, regulating pressure fluctuation in the medial chamber by its elastic deformation.

The invention relates to a damping device, especially active vibration absorber and the control method. Said vibration absorber in vibration absorbing system comprises main drive part, vibration absorbing block, changeably stiffness part, magnetic insulation block and U-shaped bracket. The main drive part comprises permanent magnet and column electromagnet. The column iron core is fixed on the bottom of bracket and permanent magnet is fixed with vibration absorbing block by magnetic insulation block. The changeably stiffness part comprises U-shaped electromagnet and MR elastomer. U-shaped iron core is opened downward, of which MR elastomer are set on two inner sides respectively. Vibration absorbing block is set among two chips and the lower end of U-shaped iron core is fixed with the upper end of U-shaped bracket to form inner space where the main drive part, vibration absorbing block, MR elastomer and magnetic insulation block are accommodated. The control method is that the changeably stiffness part and main drive part are controlled respectively according to frequency, amplitude value and phase information of vibration-damping objects. The invention belongs to half-active and active combined control and is provided with low consuming and wide vibration-damping frequency so on.

A compound vibration damper assembly includes a vertical damping unit fixedly connected at a lower end to a locating surface for absorbing a Z-direction vibration force transmitted to a target apparatus, and a horizontal damping unit connected at a lower end to an upper end of the vertical damping unit and at an upper end to a bottom of the target apparatus for absorbing X- or Y-direction vibration force transmitted to the target apparatus. The vertical damping unit includes a locating base, a central column, a supporting plate, and a vertical vibration force damping member disposed between the supporting plate and the locating base; and the horizontal damping unit includes an horizontal vibration force damping member located between an elastomeric base plate and an elastomeric top plate.

The present invention provides a resin-molded component for signal reader, which is light in weight and is able to improve the vibration damping property and to increase the resonance frequency, and which is excellent in heat dissipation. Specifically, it provides a resin-molded component for signal reader structured by 55 to 75% by weight of liquid crystalline polymer (A) composed of structural units expressed by general formulae (I) through (IV):—O—Ar1—CO—  (I)—CO—Ar2—CO—  (II)—O—Ar3—O—  (III)—O—Ar4—CO—  (IV)(where, Ar1 is 2,6-naphthalene group, Ar2 is selected from 1,2-phenylene group, 1,3-phenylene group, and, 1,4-phenylene group, Ar3 is selected from 1,3-phenylene group, 1,4-phenylene group, and p,p′-polyphenylene group, and Ar4 is 1,4-phenylene group); 20 to 10% by weight of inorganic hollow sphere (B1); and 25 to 15% by weight of fibrous inorganic filler (B2), and has 1.4 or smaller specific gravity d, 0.5 W / m·K or larger thermal conductivity λ, and 10 GPa or larger flexural modulus.

This invention relates to a composite damp material with a metal rubber interlayer, in which a metal rubber layer is clamped between a base layer and a restriction layer, the lower surface of the metal rubber layer and the top surface of the base layer, the top surface of the rubber layer and the lower surface of the restriction layer are glued together by adhesives to prepare a composite damp material with a metal rubber interlayer, which replaces traditional rubber materials with metal rubber material having the advantages of anti-corrosion, anti-aging, high and low temperature resistant and not volatile in vacuum.

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 discloses a vibration-absorbing wall which includes a wall body and a wall frame; the wall frame consists of posts and beams. The vibration-absorbing wall is characterized in that the wall body is provided with vibration-absorbing devices; the vibration-absorbing devices are rubber cushions, which are symmetrically arranged at wall angles of the wall body; the rubber cushions are in block shape, and include a pair of horizontal cushions symmetrically arranged at the lower wall angles and a pair of horizontal cushions symmetrically arranged at the upper wall angles; wherein, the horizontal rubber cushions at the lower wall angles can adopt laminated rubber cushions combined with rubber and steel plates as vibration-absorbing parts for reducing vertical deformation; while the horizontal rubber cushions at the upper wall angles are pure rubber cushions without compressive rigidity. The vibration-absorbing wall of the invention can reduce the horizontal and vertical deformation of the wall body and has quite good vibration-absorbing and preventing effect with current building wall body and through adding the vibration-absorbing devices, with simple structure and is convenient in construction. Meanwhile, the invention discloses the construction method of the vibration-absorbing wall.

A prepreg containing components (A) to (C) defined below, wherein component (A) is placed on one surface or both surfaces of a layer comprising components (B) and (C), 90% or more by area of component (A) being present in a region(s) extending from the surface(s) of the resulting prepreg containing components (A) to (C) to a depth equal to 20% of the average thickness of the prepreg: (A) urethane particles having tan δ of 0.15 or more at 10° C. and having a three-dimensional cross-linked structure, (B) a first epoxy resin composition, and (C) reinforcing fiber. The present invention provides a fiber-reinforced composite material which excels in rigidity, strength, and vibration damping properties, and a prepreg which is suitably used for production thereof, and also provides methods for production thereof.

A ball hinge support structure of a large caliber reflector of a space remote sensor belongs to the technical field of space remote sensors, relates to a ball hinge support structure, and aims to provide the ball hinge support structure of the large caliber reflector of the space remote sensor. The invention adopts the technical scheme that the ball hinge support structure comprises a connecting flange, an upper bearing support, a lower bearing support, a ball rod, a ball rod grooves, cylindrical pins, a taper sleeve, a reflecting mirror, a back panel, and the like, wherein an end of the ball hinge adjacent to the flange is a cylinder-shaped structure; four grooves are formed on the ball rod at intervals; a ball head at the other end of the ball rod is a spherical cavity; the rod end of the ball rod is connected with the flange through a screw and the cylindrical pin; the flange is connected with the back panel through a screw; the upper bearing support, the ball head of the ball rod and the lower bearing support are assembled together through a screw and the cylindrical pin; the upper bearing support is connected with the taper sleeve through a screw; and glue is used for gluing the taper sleeve and the reflecting mirror. By the adoption of the ball hinge support structure, the temperature stress and the assembly stress caused by different linear expansion coefficients of materials are unloaded, the vibration is reduced, and the reflecting mirror shape accuracy and the imaging quality are ensured.

The utility model relates to an electronic case of electrical-mechanical and thermal integration, which comprises a common motherboard, a plurality of angle strips, a plurality of cutting strips, a plurality of electrical connectors, a plurality of spring leaves, a corner pad and a plurality of circuit boards; wherein, the top part of the case is connected with the angle strips; each angle strip is magnetic sealed by the cutting strips; the common motherboard is positioned on the chassis of the case to realize the signal transmission between the circuit boards, and to make the specification to the circuit boards of different system equipments; the bottom of each circuit board is connected with the common motherboard through two electrical connectors; the top of each circuit board is connected with the top corner of the case; both ends of the circuit boards are positioned in the slots of the former board and the rear board of the case, and is fixed by the slots on both sides of the spring leaves and the corner pad to decrease vibration. The signal transmission of each circuit board in the case is operated by the common motherboard to reduce the number and the configuration weight of cables and the electric connectors which can save the space in satellites for the installation, and damping vibration within the combination of the spring leaves and the corner pad which is positioned on both sides of the slot in the circuit boards, and the purpose of vibration damping is good.

The invention discloses a rolling preparing method of a tooth-shaped junction surface of a titanium / aluminum / magnesium composite board. According to the method, an aluminum alloy sheet serves as a middle transition layer, finally, titanium alloy and aluminum alloy boards are rolled and composited under the high temperature, a composite face is a tooth-shaped face, a magnesium alloy board is rolledunder the high temperature, the face to be composited is the tooth-shaped face, and the tooth-shaped faces of the titanium / aluminum composite board and the magnesium alloy board are engaged and pressed, rolling compositing is carried out at the high temperature, and the titanium / aluminum / magnesium composite plate finished product is obtained. The titanium / aluminum tooth-shaped face composite rolling, magnesium alloy tooth-shaped face rolling and titanium / aluminum / magnesium composite rolling after tooth-shaped face engaging can be carried out under the different temperatures, and rolling composite is achieved; after tooth-shaped composite face engaging, rolling is carried out, synchronous engaging of multiple layers of alloy boards can be facilitated, the composite contact area can be effectively increased, composite face high-temperature oxidization is prevented, the stress state of the composite board interface can be changed, and the advantages that the composite board interface isgood in quality, and strength is high are achieved.

The invention relates to a particles-impact damper with an elastic support. The inner part of the particles-impact damper is provided with an elastic energy-storage component and a plastic impact energy-dissipation component. The invention is characterized in that the particles-impact damper is connected with a controlled main system through the elastic support and the natural vibration frequency of the particles-impact damper is not greater than that of the controlled main system. The elastic support can be a spiral spring, a plate spring or an elastic cushion; and free movement direction of the elastic support is identical to the vibration direction of the controlled main system. The particles-impact damper can effectively reduce acceleration in impact process and decrease impact on the controlled main system so as to consume vibration energy of the controlled main system to the maximum extent, reduce the energy retransmission to the controlled main system and alleviate the impact of ultraharmonics and subharmonic. The particles-impact damper can be applied to the vibration control of nonlinear systems with low frequency and dense modes.

A fluid-filled type engine mount having a pressure receiving chamber and an equilibrium chamber connected together through a first orifice passage, and an intermediate chamber connected to the equilibrium chamber through a second orifice passage. The intermediate chamber is partially defined by a movable film, and the pressure-receiving chamber and the intermediate chamber are situated to either side of the movable film. The movable film is a tabular rubber elastic body, and is imparted with non-linear spring properties in response to elastic deformation in a width direction thereof so that its deformation during input of idling vibration occurs in a low spring properties zone, whereas its deformation during input of vibration of greater amplitude than the idling vibration in a higher frequency range than a resonance frequency of the first orifice passage reaches a high spring properties zone.

The outer prestressed system consists of anchoring section I comprising anchor head and anchoring part, free section II and steering section III. The steering section has steering unit comprising steering pipe and 2-120 parallel guide pipes inside the steering pipe, and all the guide pipes in certain rigidity and flexibility are connected via connecting board into one integral. The anchoring section has movable lining and clamping piece forming anchoring system; and the free section consists of outer protecting sleeve, cable and pressing damper installed in proper position of the cable. The construction process of the outer prestressed system includes prefabricating sections, installing steering unit, installing anchor head, single piece tensing, grouting and painting, installing damper, installing PE casing and other steps. The system has the advantages of single piece tensing, homogeneous stress of twisted steel cable, long service life, etc.

A fluid-filled active vibration damping device including a partition member having a holding space formed therein and a movable membrane installed in the holding space. A filter orifice tuned to a higher frequency than an orifice passage is formed at one wall part of the holding space facing to one surface of the movable membrane, and the holding space is in communication with one of a pressure receiving fluid chamber and an excitation fluid chamber through the filter orifice. An open hole is formed on the other wall part of the holding space facing to the other surface of the movable membrane opposite to the one surface in the thickness direction, and the holding space is in communication with the other of the two fluid chambers through the open hole. A through hole pierces the movable membrane in the thickness direction.

The invention provides a semi-driving type variable stiffness dynamic vibration absorber made from conical springs, belonging to the technical field of vibration control. The semi-driving type variable stiffness dynamic vibration absorber comprises two mass blocks, a high-stiffness plate, two small-stiffness plates, two conical springs, a threaded rod, a stepping motor and a real-time monitoring and controlling system. The weights of the two mass blocks are the same, the two mass blocks are respectively arranged at two ends of the upper surface of the high-stiffness plate with a center hole, one large-diameter ends of the conical springs are respectively fixed at the upper surface and the lower surface of the high-stiffness plate, one small-diameter ends of the conical springs are respectively fixed on the two small-stiffness plates, one small-stiffness plate is fixedly arranged in a main structure, the threaded rod penetrates through the circular hole of the high-stiffness plate, two ends of the threaded rod are respectively in threaded connection with the small-stiffness plates, the directions of screw threads are opposite to one another, the top end of the thread rod is connected with an output end of the stepping motor, and the output end of the stepping motor is electrically connected with the real-time monitoring and controlling system. According to the semi-driving type variable stiffness dynamic vibration absorber, the semi-driving type control is easy to realize, the stiffness can be continuously adjusted, the semi-driving type variable stiffness dynamic vibration absorber is good in vibration absorbing effect, large in vibration absorbing range, quick in response, high in precision, and small in energy consumption.