434results about How to "Change the stiffness" patented technology

Endoprosthesis, such as a stent, includes at least one annular element defined by a first set of strut members interconnected to define apices proximate opposite sides of the annular element. The annular element further includes a foot extension extending between at least one pair of circumferentially-adjacent strut members. The foot extension has first and second foot portions extending circumferentially from corresponding ends of the circumferentially-adjacent strut members, and are contoured to provide at least two areas of flexure. The first and second foot portions are joined at a toe portion of the foot extension, and define a circumferentially-directed apex between the pair of circumferentially-adjacent strut members. Preferably, at least one or more additional annular elements, each defined by interconnected strut members, are provided. The annular elements are generally expandable between a delivery configuration and a deployed configuration. The annular elements are longitudinally aligned and connected at connection locations with connectors, wherein at least one of the connectors is constructed of a bio-absorbable material.

A six-degree-of-freedom micro vibration suppression platform includes a basic platform, a load platform, six sets of single-degree-of-freedom active and passive composite vibration isolation devices that are exactly the same and a controller. Upper and lower ends of each set of single-degree-of-freedom active and passive composite vibration isolation devices are connected with the load platform and the basic platform, respectively. A control method includes: calculating a logical axis signal, calculating a logical axis control signal, calculating physical axis real-time control signals and a transfer step.

The invention relates to a car collision cushioning device and a cushioning energy-absorbing method based on the magnetorheological technology. The cushioning device comprises a bumper, a magnetorheological buffer and a feedback circuit, wherein the magnetorheological buffer is arranged between the bumper and a frame cross member by flanges and composed of a helical spring, a field core, a piston, a piston rod, a cylinder, magnetorheological fluid, a first actuating coil, a magnetorheological elastomer and a second actuating coil, the feedback circuit is composed of a first acceleration sensor, a second acceleration sensor and a controller, in an instant of car collision, the controller judges whether the acceleration signal differential value of the acceleration sensor exceeds a preset threshold value or not, and regulates current output to the first actuating coil and the second actuating coil by self-adapting according to difference of collision speed, changes rigidity and damp of a car collision cushioning system, thereby reducing passenger injury and car damage caused by collision.

The invention provides a three degree of freedom micro-vibration suppression platform and a control method thereof, belongs to vibration isolation and suppression devices, and solves problems of complicated structure and complex control method of a prior active-passive composite vibration isolation structure. The platform provided by the invention includes a base platform, a load platform, three sets of single degree of freedom active-passive composite vibration isolation assemblies which are totally identical and a controller. The upper end and the lower end of each single degree of freedom active-passive composite vibration isolation assembly are connected with the load platform and the base platform. The control method provided by the invention includes calculating logic axis translation signals, calculating logic axis control signals, calculating physical axis real time control signals and transmission steps. The platform provided by the invention is simple in structure, adjustable in rigidity, is capable of suppressing and isolating three degree of freedom microvibration in rotation directions of an X axis and a Y axis and a translation direction of a Z axis and is suitable for different occasions. Microvibration of different frequency bands can be dampened effectively and reliable guarantee can be provided for precision machining and measurement equipment in a microvibration environment.

The invention discloses a harmonic oscillator of a solid fluctuation gyro, which comprises a resonance ring (1), a resonance transmission part (2), a chassis (3) and a piezoelectric element (4), wherein, the resonance ring (1) is connected with the chassis (3) through the resonance transmission part (2), the resonance transmission part (2) is composed of support beams (21) which are uniformly distributed in the circumferential direction, and the piezoelectric element (4) is arranged on the support beams (21). The invention further discloses the solid fluctuation gyro provided with the harmonic oscillator. The solid fluctuation gyro and the harmonic oscillator of the invention have the advantages of high sensitivity, good sensing effect, convenient machining, low machining cost, simple mechanical balance procedure and the like.

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.

Soft, durable and bulky tissue products comprising non-wood fibers and more particularly high yield hesperaloe pulp fibers are disclosed. The tissue products preferably comprise at least about 5 percent, by weight of the product, high yield hesperaloe pulp fiber and have relatively modest tensile strengths, such as a geometric mean tensile (GMT) greater than about 1,000 g / 3″, and improved durability and cross-machine direction (CD) properties, such as a CD Stretch greater than about 10 percent. Additionally, at the foregoing tensile strengths the products are not overly stiff. For example the tissue products may have a Stiffness Index less than about 10.0.

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.

The invention discloses a variable-rigidity flexible grabbing device. The variable-rigidity flexible grabbing device comprises two sliding blocks arranged on a linear guideway in a sliding mode, and the sliding blocks are driven by an opening and closing motion motor to do the movement so as to enable the sliding blocks to be close to each other and away from each other; and each sliding block isconnected with a clamping jaw for grabbing operation through a variable-rigidity flexible parallel mechanism, and the variable-rigidity flexible parallel mechanism is driven by a rigidity adjusting motor so as to adjust the rigidity of the variable-rigidity flexible parallel mechanism. In the working state, the parallel clamping displacement of the clamping jaws in the opening and closing movementdirection is controlled through driving of the opening and closing motion motor; and the clamping rigidity of the clamping jaws on the opening and closing movement is controlled through driving of the rigidity adjusting motor. According to the variable-rigidity flexible grabbing device, the clamping rigidity of the grabbing device in the opening and closing movement direction can be continuouslychanged so as to adapt to the clamping operation of objects with different shapes and different masses; and the grapping device can be used as a tail end effector of a robot and is particularly suitable for the fields of operational tasks, precision assembly and the like in the non-structural environment.

The invention relates to a variable-stiffness robot joint structure, belongs to the technical field of bionic robot joints, and is suitable for elbow joints of a bionic robot. Compared with the prior art, the invention designs a new robot joint structure which can simulate the joint with nonlinear variable-stiffness muscle characteristics. A spring piece is taken as a stiffness regulating component and is also taken as a force transmission component, and the stiffness of the spring piece can be changed according to the change of action length. In order to realize the regulation for the action length of the spring piece, through the matching driving of a power component and an action execution component, the action length of the spring piece can be easily regulated through the slippage of a mobile slide rest. Under the condition that the stiffness is not changed, the joint structure can rotate, so that the position regulation of the joint structure under the constant-stiffness condition is realized. Under the condition that the joint structure does not rotate, only the stiffness of the joint structure is changed, therefore the working requirement of the joint under the set stiffness condition is met.

The invention relates to a flexible body of a bionic robot, and belongs to the technical field of bionic robots. The flexible body comprises a front body, a back body, an artificial spine, and pneumatic artificial muscles, wherein the artificial spine is formed by sequentially arranging a plurality of bionic spine units from small to large, the bionic spine units are completely same in structure and are different in size, and each bionic spine unit consists of a bionic spine, a bionic intervertebral disc soft cushion and a spring. The flexible body has the advantages that a leg mechanism is assisted to realize the flexible and in-place steering function of the bionic robot, the mobility of the robot adapting to the complicated environment is improved, the flexibility is high, the bionic effect is good, and the like.

The invention discloses a variable-rigidity flexible drive joint. The variable-rigidity flexible drive joint comprises a joint shell, a joint motor and a harmonic reducer. The end portion of a motor shaft of the joint motor is connected with a wave generator of the harmonic reducer to serve as the input of the joint. The motor shaft is provided with a rigidity adjusting mechanism. A steel wheel of the harmonic reducer is fixed to one flange. The outer ring of the flange is matched with the joint shell through a bearing. A groove is formed in the flange and is in contact with one end of an elastic part. The other end of the elastic part is fixed. The deformable length of the elastic part is adjusted through the rigidity adjusting mechanism, and therefore flexible connection between the steel wheel and the joint is achieved, and a flexible wheel of the harmonic reducer serves as the output of the joint.

A vibration damper using electric rheopectic liquid for the engine of car features that a pair of electrode connected to high-voltage power supply is installed at both sides of a rectangular damping channel full of electric rheopectic liquid, and regulating the output voltage of said high-voltage power supply can change the electric field intensity between two electrodes and in turn the viscosity of electric rheopectic liquid, so regulating the damping effect.

An apparatus for amelioration of incontinence in a female subject. The apparatus comprises a stiffenable ring adapted for intra-vaginal insertion and a stabilizing extension, projecting axially from said stiffenable ring, said stabilizing extension having a size and position configured to stabilize said stiffenable ring within the vagina.

The invention relates to tissue products comprising hesperaloe fibers and methods of producing the same. Preferably the hesperaloe fibers are high yield hesperaloe pulp fibers, which have demonstrated the ability to replace substantially all of the long fiber fraction of the papermaking furnish without negatively effecting important tissue product properties such as CD Stretch, CD Durability and bulk. Thus, the tissue product may comprise greater than about 90 weight percent hesperaloe fiber and more preferably greater than about 95 weight percent.

An apparatus has a first structure, a second structure, and an activated seal. The second structure has a first position adjacent to the first structure such that the first structure is not in contact with the second structure. The activated seal is attached to at least one of the first structure and the second structure. The activated seal has a variable stiffness that may be changed in response to a stimuli such that the activated seal is capable of being deformed when at least one of the first structure and the second structure are moved relative to each other.

The invention discloses a novel intelligent shock absorber integrating multilayer magnetorheological elastomers with a magnetorheological damper. The shock absorber comprises the magnetorheological damper and a variable stiffness device comprising the multilayer annular magnetorheological elastomers and magnetorheological elastomer magnet exciting coil windings mounted between the multilayer annular magnetorheological elastomers respectively, wherein the magnetorheological damper comprises a cylinder barrel; the cylinder barrel is connected to the top end of the shock absorber through a spring; a piston plate is arranged in the cylinder barrel; a piston rod is fixedly connected to the lower side of the piston plate; the other end of the piston rod penetrates out of the cylinder barrel and is fixed at the bottom end of the shock absorber; a magnetorheological damper magnet exciting coil winding is wound on the side wall of the piston plate; the cylinder barrel is filled with a magnetorheological fluid; a damping device is connected with the variable stiffness device in parallel or in series. Due to the integration of the multilayer magnetorheological elastomers and the magnetorheological damper, the stiffness and damping change range of the shock absorber is relatively large, a relatively good shock absorption effect can be achieved, and the shock absorber is compact in structure.

The invention aims to provide a rigidity-adjustable electromagnetic vibration isolator. The structure of a spring steel sheet portion is that an outer layer of spring steel sheets and an inner layer of spring steel sheets are distributed in a bilaterally symmetrical mode and are fixed between an upper fixing plate and a lower fixing plate respectively. Damping materials are filled between the laminated spring steel sheets. The structure of an electromagnet portion is that electromagnetic coils are installed on iron cores, the iron cores are fixed on the upper inner surface and the lower inner surface of an electrician pure iron mounting rack respectively, and the electrician pure iron mounting rack provided with the electromagnetic coils is fixed to the lower fixing plate of the vibration isolator through bolts. The structure of a movable permanent magnet portion is that two adjusting bolts are fixed on the upper fixing plate through nuts respectively, two protruded circular columns are arranged on the center of the upper surface and on the center of the lower surface of a permanent magnet fixing plate, two ring permanent magnets are fixed on the upper surface and the lower surface of a middle plate through the protruded circular columns, and the fixing plate provided with the permanent magnets is connected with the adjusting bolts through the adjusting nuts. According to the rigidity-adjustable electromagnetic vibration isolator, the advantage of good stability of a passive vibration isolator and the advantage of flexible application of an active vibration isolator are integrated.

Soft, durable and bulky tissue products comprising non-wood fibers and more particularly high yield hesperaloe pulp fibers are disclosed. The tissue products preferably comprise at least about 5 percent, by weight of the product, high yield hesperaloe pulp fiber and have relatively modest tensile strengths, such as a geometric mean tensile (GMT) less than about 1,000 g / 3″, and improved durability and cross-machine direction (CD) properties, such as a CD Stretch greater than about 10 percent. Additionally, at the foregoing tensile strengths the products are not overly stiff. For example the tissue products may have a Stiffness Index less than about 10.0

The invention relates to an anti-collapse multi-layer metal corrugated pipe solid-liquid mixed vibration isolator. The vibration isolator comprises a corrugated pipe container, hydraulic oil, compressible elastic rubber units and circular sticking patches, wherein the corrugated pipe container is loaded with a solid-liquid mixed medium composed of the hydraulic oil and the compressible elastic rubber units; the compressible elastic rubber units can be filled with air, pressurized gas or be vacuumized; and the circular sticking patches are welded to the top end and the bottom end of the corrugated pipe container to seal the corrugated pipe container. The vibration isolator has good vibration isolation performance and can effectively improve the anti-collapse capacity of structures. The vibration isolation effect can be adjusted by changing the number of the compressible elastic rubber units, and meanwhile the problem of oil leakage is avoided by adopting multiple layers of corrugated pipes. Alloy materials used for making the corrugated pipes has the multiple advantages of oil resistivity, corrosion resistance, heat resistance, lowest aging and the like.

The invention discloses a body type epistemic passive biped walking robot system and relates to the technical field of robots, solving the problem that the traditional robots do not conform to the requirements of natural gait and low energy consumption. According to the body type epistemic passive biped walking robot system, an upper end and a lower end of a transmission mechanism of a serial elastic drive unit are respectively connected with one end of a third steel wire rope, and the other ends of two steel wire ropes at the lower end are respectively connected with a motor transmission chain to jointly form two groups of serial elastic drive units; a first auxiliary wheel and an inner leg transmission wheel right below the first auxiliary wheel are connected through first steel wire ropes, the winding mode of the first steel wire ropes is of a C shape, and the winding directions of the two first steel wire ropes are opposite; and a second auxiliary wheel and an outer leg transmission wheel right below the second auxiliary wheel are connected through second steel wire ropes, the winding mode of the second steel wire ropes is of an S shape, and the winding directions of the two second steel wire ropes are opposite. The self natural dynamics characteristics can be sufficiently utilized by the epistemic passive robot, so that the characteristic of natural gait can be represented in a walking process of the epistemic passive robot, and the walking energy consumption is low.

The invention relates to the technical field of robot research and engineering, and provides a variable-rigidity software framework structure and a software arm-shaped robot in order to solve the problem that an existing software robot is insufficient in rigidity. The variable-rigidity software framework structure comprises a plurality of telescopic units, and two adjacent telescopic units are coaxially connected to one universal joint connector; a cavity at the joint of the telescopic units and the universal joint is filled with particle obstructions, and the outer surface of the framework structure formed by the telescopic units is sleeved with a vacuum sealing bag. According to the variable-rigidity software framework structure and the software arm-shaped robot, the telescopic units andthe universal joint connector are combined, the bending and extending capacity is achieved, follow-up movement inside a software arm is achieved, the variable-rigidity software framework structure can be embedded inside the software robot, joint movement along with the software arm can be achieved under the condition that movement of the software arm is not affected, and the rigidity of the software robot in the movement process can be rapidly and efficiently changed.

The present invention provides soft, durable and bulky tissue products comprising non-wood fibers and more particularly hesperaloe fiber. The inventors have discovered that high yield hesperaloe pulp fiber, when incorporated in amounts of at least about 5 percent by weight of the tissue product, produces products having a GMT less than about 1000 g / 3″ and a GM Slope less than about 7.0 kg. At the foregoing tensile strengths and modulus the tissue products of the present invention are also generally soft, such as having a Stiffness Index less than about 10.0, and more preferably less than about 9.0, such as from about 7.0 to about 9.0.

The invention relates to a variable rigidity flexible driver for an exoskeleton type lower limb rehabilitation robot. The variable rigidity flexible driver comprises a support, a driving motor, an execution unit, a lead screw arranged between a lead screw bearing pedestal installing bottom plate and a lead screw bearing pedestal installing top plate, a lead screw nut movably connected to the lead,two springs connected to the top end and the bottom end of the lead screw nut, an end executive component fixedly connected with one spring, and a torsional spring transmission unit arranged betweenthe lead screw bearing pedestal installing top plate and a motor installing plate, and the two ends of the torsional spring transmission unit are fixedly connected with the driving motor and the top end of the lead screw. Compared with the prior art, due to the fact that elastic coefficients of two flexible components of the springs and the torsional spring are different, the rigidity of the driver is changed, and the purpose of simulating the sports effect of body muscle is achieved.

A shock absorber piston assembly and a self-adjusting damping shock absorber comprising same relate to a shock absorber part and a shock absorber; the shock absorber piston assembly comprises a main piston, a floating piston, and an auxiliary working cylinder; the inner hole of the main piston is fixedly connected with the excircle of the auxiliary working cylinder; one end of the auxiliary working cylinder is fixedly connected with a piston rod; a clamping ring, the floating piston and a floating piston reset spring are respectively installed in the auxiliary working cylinder; and the inner cylinder wall of the auxiliary working cylinder is axially provided with a throttling groove; the shape of the longitudinal section of the throttling groove is a trapezoid or a multi-level ladder-shaped structure. The self-adjusting damping shock absorber comprising the shock absorber piston assembly comprises an oil storage tank, a working cylinder, a piston assembly, and a shock absorber spring, and the piston assembly is the shock absorber piston assembly. The invention can automatically adjust the damping, has very good shock-absorbing effect, and also has the advantages of simple structure, low cost, reliable performance, long service life, and the like, and ensures the running ride comfort and the stability of the vehicle.

The invention relates to a vibration isolation and buffer device for machine-born equipment, in particular to a totally-closed rigidity adjustable type vibration isolator, which comprises a casing, an installation core shaft, a protective rubber cover, an upper rubber ring, a spherical vibration isolation part and a lower rubber ring. The casing is of a sealed structure, the top of the casing is provided with an installation hole where the installation core shaft is arranged, and the spherical vibration isolation part is arranged in the sealed casing and is connected with the bottom of the installation core shaft together. The upper rubber ring is sleeved at the upper portion of a damp rubber ball, and the lower rubber ring is sleeved at the lower portion of the damp rubber ball which is sealed in the casing. The totally-closed rigidity adjustable type vibration isolator adopts a totally-closed structure to have small environment influence, utilizes a combination structure combining the spherical surface and the cylindrical surface to improve vibration isolation and retarding effects, utilizes the structures of the upper rubber ring and the lower rubber ring to limit the swinging of the head of the installation core shaft and improve using safety, and can be suitable for different frequency ranges by rotating the upper cover to adjust the rigidity of the vibration isolator.

The invention relates to a force control loading and layout variable vertical vibration experimental device which comprises an n-type steel frame, a vertical vibration plate, a loading spring, an acceleration sensor, a displacement sensor and an adjustable damper. The n-type steel frame comprises two supporting stand columns, a top transverse beam, a bottom transverse beam and a bearing platform, and the bearing platform is used for fixing a vibration absorber and located between the top transverse beam and the bottom transverse beam. The vertical vibration plate can be elastically and vertically arranged between the top transverse beam and the bottom transverse beam in an up-and-down vibration mode. One end of the loading spring is connected with the vertical vibration plate, the other end of the loading spring is connected with an electric vibration loading table, and the loading spring is used for exerting the predetermined external force on the vertical vibration plate. The acceleration sensor is arranged on the vertical vibration plate and used for measuring the accelerated speed of the vertical vibration plate in the vibration stress loading process. The displacement sensor is arranged between the vertical vibration plate and the top transverse beam and used for measuring the displacement value of the vertical vibration plate in the vibration stress loading process. The adjustable damper is arranged between the vertical vibration plate and the top transverse beam and used for adjusting and controlling the damping of the vertical vibration plate in the loading vibration stress loading process.