40results about How to "Control stiffness" patented technology

The invention discloses a carbon fiber water-soluble epoxy resin sizing agent and a preparation method thereof. The sizing agent comprises main slurry and deionized water as main components, wherein the mass ratio of the main slurry to the deionized water is (50-80):(20-50); and the main slurry consists of modified phenol-formaldehyde epoxy resin and allyl polyoxylethylene ether (AEPH), and the mass ratio of the modified phenol-formaldehyde epoxy resin to AEPH is (60-90):(10-40). The preparation method of the sizing agent comprises the following steps: firstly reacting phenol-formaldehyde epoxy resin with diethanolamine to obtain water-soluble phenol-formaldehyde epoxy resin; and then mixing the water-soluble resin with AEPH in proportion, and performing dilution to reach a certain concentration by using the deionized water to obtain the sizing agent. The sizing agent disclosed by the invention is good in stability and low in cost, cannot cause environmental pollution, and is simple in preparation method; good post-processing performance of carbon fibers can be provided by adding flexible molecular AEPH; experiments show that after the carbon fibers are coated with a proper amount of the sizing agent, the post-processing performance can be significantly improved; and the performance of a carbon fiber epoxy resin composite material can be improved.

A golf club head that includes several slotted apertures that extend through the body of the club head, the slotted apertures being defined by several generally parallel, spaced-apart elongated spring members, the spring members can be used to create a lower stiffness at their mid-section rather than their ends.

A ballistic composite comprises multiple layers of a fabric having unidirectional ballistic resistant yarns in at least two layers and a resin layer between each pair of such multiple layers adhered to the ballistic resistant yarns but not encapsulation the same and not penetrating the layer of fabric. The ballistic yarn layers are at 90°±5° with respect to each other and the ballistic resistant yarns are stabilized by being woven in a second fabric. The second fabric is formed of yarns having a substantially lower tenacity and tensile modulus than the ballistic resistant yarn. The ballistic resistant yarns have a tenacity of at least about 15 grams per denier and a modulus of at least about 40 grams per denier. The resin in the resin layer has a modulus of at least about 7000 psi.

The invention discloses a semi-active control hydraulic suspension for an automobile powertrain. The semi-active control hydraulic suspension comprises a suspended shell; an upper liquid chamber communicates with a lower liquid chamber through the inertia channel on an inertia channel body; an air cavity that is a sealed cavity is positioned between a decoupling membrane and the inertia channel; the inertia channel body is provided with an opening communicating with the air cavity; the inner wall of the opening takes the shape of a circular truncated cone; the diameter of the inner wall of the lower end of the opening is more than that of the upper end of the opening; a rubber base membrane is provided with a through hole; one end of the through hole only communicates with the opening while the other end of the through hole communicates with a bottom bowl; a stopper matched with the opening for sealing is arranged in the through hole; and a driving mechanism for controlling the stopper to move axially along the opening is arranged in the bottom bowl. Compared with the prior art, the semi-active control hydraulic suspension for the automobile powertrain has the characteristics of good stability in use, long service life, wide absorbable vibration frequency band, being capable of effectively reducing vibration and noise in an automobile in various driving conditions, and thereby enabling the automobile to be good in comfort.

The invention discloses a helical antenna flexible support apparatus used for solving the support of a helical antenna. The helical antenna flexible support apparatus comprises a dielectric slab and multiple flexible support filaments. The bottom of the helical antenna is installed on the dielectric slab through multiple dielectric bases distributed uniformly and circumferentially. The multiple flexible support filaments are distributed around the helical antenna radially and uniformly, are arranged along the axial direction of the helical antenna, and are connected with each layer of the helical antenna through a thread pitch fine tuning apparatus. The helical antenna flexible support apparatus controls the thread pitch and the rigidity of the helical antenna by using the restoring force of the helical antenna and the unidirectional support characteristic of the flexible filaments. Compared with a conventional helical antenna hard support apparatus, the helical antenna flexible support apparatus greatly decreases the weight of a helical antenna apparatus and may achieve screwing compaction release so as to greatly reduce the installation enveloping space of the helical antenna.

The invention relates to a robot steering engine with a flexible characteristic. The rigidity of the conventional device cannot be adjusted, so that the conventional device cannot meet the increasing requirement on a robot. The robot steering engine comprises long screws, a bottom cover, a shell, a motor, a motor gear, a top cover, an upper bearing, a lower bearing, a plurality of gear groups and a flexible gear, wherein the bottom cover, the shell and the top cover are connected with one another through the long screws to form a closed space; the motor, the motor gear, the upper bearing, the lower bearing, a plurality of gear groups and the flexible gear are arranged in the closed space; the motor gear is arranged on an output shaft of the motor; the motor gear drives the flexible gear to rotate through the gear groups; and the flexible gear is movably matched with the top cover through the upper bearing and movably matched with the shell through the lower bearing. By the torsional spring sheet type flexible structure, the space occupied by an elastic element is greatly reduced; and the robot steering engine is favorable for minimization and lightening of joints of the robot.

A rim (122) for a bicycle spoked wheel (121) is disclosed that has a change of radial section of the side walls (13, 14). Through changes of symmetry / asymmetry with respect to a middle plane and / or changes of radial extent, it is possible to improve the performance of the rim in terms of balance, camber angles and / or strength. Preferably, the radial section is variable, still of constant area along the circumference, apart from holes (123a, 124a, 125a) for the attachment of spokes and possible openings (123b, 124b, 125b) for the passage of nipples. A process for manufacturing a rim for a bicycle wheel is also described, comprising hydroforming a tubular extruded piece to locally change the section of the side walls (13, 14).

In a method of making a tubular support bar for a dashboard support, a sheet metal blank is placed in a first forming tool and pressed in a first shaping step by a ram into a U-shaped cavity of a first bottom die to form a U-shaped member. While remaining in the first bottom die, the U-shaped member is provided with connecting elements in the form of weld nuts by a automated placement device. Subsequently, the U-shaped member is transferred to a second forming tool and undergoes a second shaping step between a top die and a second bottom die to form a slotted tube. The longitudinal edges of the slotted tube are then joined together to form the support bar.

The invention discloses an electric wheel driving system integrating steering, roll preventing and driving. The electric wheel driving system comprises a double-rotor motor, an anti-roll gear, an L-shaped anti-roll rod and a linear motor and is characterized in that the output end of the outer rotor of the double-rotor motor is connected with a wheel, and the output end of the inner rotor of the double-rotor motor is connected with a drive gear; the anti-roll gear is located on one side of the drive gear and meshes with the drive gear; one end of the L-shaped anti-roll rod is fixedly connectedwith the anti-roll gear through a first clutch, and the other end of the L-shaped anti-roll rod is connected with a suspension; the linear motor is fixed on one side of the double-rotor motor, and the secondary end of the linear motor is connected with a steering tie rod and used for driving the steering tie rod to achieve steering; when the first clutch is in a combining state, the output end ofthe inner rotor generates resisting moment for stopping the suspension from bouncing vertically so as to prevent roll. The electric wheel driving system has the advantages that system integration isincreased, space saving is achieved, and overall-vehicle arrangement is facilitated.

The invention relates to a flight control device (1) for an aircraft, the device comprising a mount (2), a lever (3) pivotally mounted on the mount, and mechanical means for generating a return force for the lever, said means including a spring (6) and a first motor member (13) that are arranged so that a first end of the spring is constrained to move in rotation with the lever and a second end of the spring is constrained to move in rotation with an outlet shaft of the first motor member. According to the invention, the flight control device includes an electrical assistance system (18) for assisting said mechanical means for generating a return force.

The invention relates to a position control system based on steel wire rope driving, which comprises a longitudinal guide rail, transverse guide rails, a steel wire rope group and driving devices, wherein the longitudinal guide rail is slidably connected with the transverse guide rails; the steel wire rope group is connected with a controlled mobile platform and the driving devices, and used for driving the controlled mobile platform to move along the longitudinal guide rail based on a driving force outputted by the driving devices. According to the scheme provided by the invention, longitudinal and transverse positions of the controlled mobile platform can be controlled accurately.

The invention discloses an active control SMA metal rubber shock absorber and a vibration isolation performance adjusting method, and belongs to the field of vibration and impact protection. The problems that an existing vibration isolator is simple in structure, has natural frequency and fixed rigidity and cannot be adjusted to be applicable to various working conditions are solved. The shock absorber comprises an SMA metal rubber blank and insulated electric heating wires which are uniformly distributed in the SMA metal rubber blank, and the SMA metal rubber blank and the insulated electricheating wires are stamped into an integral piece. The temperature of the SMA metal rubber shock absorber is adjusted by changing the current introduced into the insulated electric heating wires, and the rigidity, the natural frequency, the transmission rate and the energy dissipation coefficient of the SMA metal rubber shock absorber are adjusted according to the change of the temperature of the SMA metal rubber shock absorber. The shock absorber is mainly used for vibration reduction.

The invention discloses a manufacturing method for an air purification and filtering skeleton supporting material and aims at providing a manufacturing method of a skeleton supporting material which is simple in manufacturing process, high in air permeability and stiffness and small in air resistance and does not have peculiar smell. The key points of the technical scheme are characterized in thatthe manufacturing method comprises the following steps of mixing PET fibers in different specifications, making base paper with pulp with a wet method by an inclined wire paper machine, and performing coating treatment. The manufacturing method is suitable for the technical field of indoor air purification material preparation.

The invention relates to a built-in miniature balloon joint distraction device, which comprises a catheter body, a swing assembly and a balloon, wherein the catheter body and the swing assembly are of a pipe cavity structure; one end of the swing assembly is movably connected with one end of the catheter body through a flexible pipeline, and the other end of the swing assembly can be connected with external equipment; an operating handle is arranged on the catheter body; a control assembly is arranged on the operating handle and is used for controlling the pointing direction of the swing assembly; the balloon comprises a balloon body and a balloon skeleton; the balloon framework is of a pipe cavity structure with an opening in one end; through holes are arranged on the pipe wall of the balloon framework; one part of the balloon framework is located in the balloon body; the through holes communicates with the balloon body; and one end of the balloon framework is detachably connected with one end of the swing assembly. The built-in miniature balloon joint distraction device has the advantages that the structure is simple, flexibility is high, cost can be effectively controlled, the operation view of an operator is increased, a better operation environment is obtained, an operation success rate is increased, and arthroscopic operation difficulty is reduced.

The invention relates to a non-deflection rod type high-frequency tuning mass damper and belongs to the technical field of civil engineering structure damping. The problems that the occupied space is large, the applicability is not high, the cost is high, and precise frequency modulation cannot be achieved in the prior art are solved through the non-deflection rod type high-frequency tuning mass damper. The non-deflection rod type high-frequency tuning mass damper comprises a mass block, an elastic element and a damping element. The elastic element comprises at least two elastic rods. The two ends of the elastic rods are supported on a bracket, and the mass block is connected with the elastic rods; or, one ends of the elastic rods are supported on the bracket, and the other ends of the elastic rods are connected with the mass block. When all the elastic rods work, the component force of the dynamic restoring force resultant force at least in the perpendicular direction passes the mass center of the mass block or passes the position near the mass center. The damping element is directly arranged on the surfaces of the elastic rods or is connected with the mass block. The non-deflection rod type high-frequency tuning mass damper is higher in applicability and performance price ratio, capable of being widely used for high-frequency vibration control over underground track beds and other structures and very wide in market application prospects.

The invention discloses a carbon fiber water-soluble epoxy resin sizing agent and a preparation method thereof. The main components of the sizing agent are main size and deionized water, and the mass ratio of main size to deionized water is 50~80:20~50. The main slurry is composed of modified novolac epoxy resin and allyl polyoxyethylene ether (AEPH), and the mass ratio of the two is 60~90:10~40. To prepare the sizing agent, first react the novolac epoxy resin with diethanolamine to obtain a water-soluble novolac epoxy resin; then mix the water-soluble resin and AEPH in proportion, and dilute it to a certain concentration with deionized water to obtain the sizing agent. The sizing agent has good stability, low cost, no environmental pollution and simple preparation method. The addition of flexible molecule AEPH endows carbon fibers with good post-processing properties. Experiments show that after the carbon fiber is coated with the appropriate sizing agent, the post-processing performance is obviously improved; the performance of the carbon fiber epoxy resin composite material is improved.

The invention provides a natural orifice operation mechanical arm. The natural orifice operation mechanical arm comprises an inner insulating sleeve, an inner metal hose, an electrorheological fluid channel, an outer metal hose and an outer insulating sleeve which are sequentially arranged in a sleeving mode from inside to outside. The electrorheological fluid channel is filled with electrorheological fluid, and the electrorheological fluid is in a liquid state when an electric field is not applied; with increase of intensity of an external electric field, the viscosity is continuously increased in the external electric field, and the electrorheological fluid can be sequentially converted into a gel state and a solid state from the liquid state. The inner metal hose and the outer metal hose are arranged at an interval, are externally connected with a power supply and are used for forming the external electric field at the electrorheological fluid channel. The external electric field isformed at the electrorheological fluid channel, and the intensity of the external electric field is controlled by controlling the voltage value of an external power supply, so that the viscosity of the electrorheological fluid is changed, the rigidity of the electrorheological fluid channel is controlled, and the overall rigidity of the natural orifice operation mechanical arm is controllable.

Disclosed is a hanging basket construction device for an asymmetric arc-shaped variable cross-section thin wing plate box girder. A hanging basket is composed of girder surface triangular main trusses, a bearing platform, a cable-stretching system, a traveling system, an in-position anti-push system, an anchoring system, an operation platform, a pre-buried part system and the like. The bearing platform of the hanging basket is formed by a combined structure of a box girder main frame and trusses, so that the rigidity of the hanging basket is effectively controlled, self-weight of the hanging basket is reduced, and the cost is reduced. An empty basket traveling task of the hanging basket is finished by means of traveling trolleys, traveling tracks, crab claw type sliding blocks, steel lifting belts, the girder surface inner-side triangular main trusses and a hauling mechanism. During usage, the crab claw type sliding blocks are reversely hooked on the girder surface inner-side triangular main trusses, the crab claw type sliding blocks are connected with a bearing platform girder by being connected with the steel lifting belts, the tail of the bearing platform is anchored to a girder bottom plate through traveling wheels, the hauling mechanism hauls sliding shoes to move forwards, therefore, the bearing platform is driven to move forwards, and the traveling mode is steady and reliable.

The invention relates to the technical field of flexible robots, in particular to a flexible driving structure, a flexible driver and a driving system. The flexible driving structure comprises connecting pieces and at least one driving assembly, and each driving assembly comprises an elastic restraining piece, a flexible driving piece and a pre-tightening piece. A cavity which extends in the axial direction of each flexible driving piece and is used for connecting in fluid is formed in the flexible driving piece, the elastic restraining pieces are arranged on the outer walls of the flexible driving pieces in a surrounding mode, the connecting pieces are arranged at the two ends of the elastic restraining piece in the axial direction, the elastic restraining pieces are connected with the connecting pieces through the pre-tightening pieces, and the pre-tightening pieces extend in the axial directions of the flexible driving pieces. By means of the flexible driving structure, the size, shape and rigidity of a flexible robot can be greatly changed, the flexible robot has the controllable rigidity modulation capacity, the low rigidity enables the flexible robot to have adaptability and compliance to the environment, the interaction safety is guaranteed, and the high rigidity can be used for forming a rigid operation platform. The force can be transmitted and the loads can be borne, so that the control precision is improved.

The invention relates to a robot sealing column, the column frame is installed in the outer cover, the ball screw is rotatably installed on the column frame, and is connected with the driving motor installed outside the outer cover, the ball screw is screwed with a screw nut, and the screw nut is connected There is a skateboard carriage; the upper and lower ends of the outer cover are equipped with sealing intermediate wheels, the end face of the column skeleton is in the shape of a "mouth", which is an internal hollow structure, and one end of the sealing belt is bypassed by the inner side of the "mouth" end face of the upper end. After the sealing intermediate wheel is wound to the outside of the "口"-shaped end face, it is connected with the upper end of the skateboard frame, and the other end of the sealing tape is wrapped around the lower sealing intermediate wheel from the inner side of the "口"-shaped end face to the "口"-shaped After the outer side of the end face, it is connected with the lower end of the skateboard frame. The drive motor drives the ball screw to rotate through the transmission mechanism, and the screw nut drives the skateboard frame to rise and fall relative to the column frame. The invention satisfies the basic functions of the robot, and at the same time achieves the purposes of sealing the joints of the robot, being dust-free and improving the dynamic performance of the robot.

The fiber metal hybrid composite material filled with MRE interlayer and the preparation method thereof of the present invention. The composite material includes a laminated board wrapped with iron powder, a lubricant and a matrix to form a raw material. The laminated board is used as the middle layer, and the upper and lower layers are symmetrically arranged with a fiber cloth layer and an alloy board layer in sequence. The surface of the laminated board is tightly wound with copper. Wire. When preparing, mix according to the ratio of raw materials, lay alloy plates up and down, roll to form a laminate, and then wind copper wires, center on the laminate, lay fiber cloth and alloy plates up and down in turn, each layer is glued and rolled to obtain a filling Fiber-metal hybrid composites with MRE sandwiches. The process of the method is simple and the process is mature. The magnetorheological elastomer material in the laminate improves the damping and energy absorption efficiency, and can control the stiffness and damping characteristics within a certain range by changing the magnetic field by controlling the current in the coil.

The present invention relates to a three-branch six-degrees-of-freedom low-temperature test bed of a railway vehicle air spring. The test bed comprises a three-branch test platform, a loading quality arc block, a refrigeration cycle system, horizontal actuator mechanisms, a T-shaped slot foundation, a capacity-variable air reservoir and an adjustable support rammer. The three-branch six-degrees-of-freedom low-temperature test bed of the railway vehicle air spring performs test aiming at the low-temperature performance of the railway vehicle air spring, the three-branch test platform is cooperated with the three horizontal actuator mechanisms to simulate the six-degrees-of-freedom motion condition of the air spring in the rail train operation, the loading quality arc block simulates the qualities of the vehicle frame and the vehicle body located on the air spring, and the refrigeration cycle system simulate the intensity changing condition of the air spring in the low temperature condition. The three-branch six-degrees-of-freedom low-temperature test bed of the railway vehicle air spring can effectively improve the safe operation of the high-speed train set, improve the riding comfortableness of the high-speed train set and prompt the development of the train-set technology and is convenient for railway vehicle enterprises to employ the test bed to perform object test and performance comparison of the selected air spring.

The invention relates to a self-resetting swing shock-isolation system, comprising a spring reset mechanism and a crab-shaped swinging mechanism, wherein the spring reset mechanism comprises an upperpart bearing platform, a lower part bearing platform, a vertical rod and spring reset components; the vertical rod is install between the upper part bearing plate and the lower part bearing platform,and penetrates out of bottom faces of the upper part bearing plate and the lower part bearing platform; the spring reset components, used for enabling the upper part bearing platform and the lower part bearing platform to automatically reset, are respectively installed at the parts, which respectively extend out of the upper part bearing platform and the lower part bearing platform, of the vertical rod; the crab-shaped swinging mechanism comprises the lower part bearing platform, diagonal draw bars, diagonal support bars and bases; the diagonal draw bars are symmetrically installed at the twosides of the lower part bearing platform, and the other ends of the diagonal draw bars are connected with the diagonal support bars. The self-resetting swing shock-isolation system provided by the invention can dissipate earthquake energy by swinging during an earthquake so as to protect an upper part structure. When the earthquake is ended, a restoring force is provided by means of structure self-weight and spring torsion, so that a reset effect is achieved.