39results about How to "Improved stiffness properties" patented technology

This invention relates to an aluminum conductor composite core reinforced cable (ACCC) and method of manufacture. An ACCC cable has a composite core surrounded by at least one layer of aluminum conductor. The composite core comprises a plurality of fibers from at least one fiber type in one or more matrix materials. The composite core can have a maximum operating temperature capability above 100° C. or within the range of about -45° C. to about 230° C., at least 50% fiber to resin volume fraction, a tensile strength in the range of about 160 Ksi to about 370 Ksi, a modulus of elasticity in the range of about 7 Msi to about 37 Msi and a coefficient of thermal expansion in the range of about -0.7x10<-6 >m/m/° C. to about 6x10<-6 >m/m° C. According to the invention, a B-stage forming process may be used to form the composite core at improved speeds over pultrusion processes wherein the speeds ranges from about 9 ft/min to about 60 ft/min.

The invention provides a large-travel active adjusting damper of a SMA wire split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve comprises a split sleeve, a super-elasticity SMA wire, a piston, two external bolts, two damping rings and a mounting frame; the inner wall of the split sleeve is a periodic diameter change cylindrical surface, and is complementary with the outer wall of the piston in shape; two ends of the piston are connected with the external bolts for connecting the damper with other parts; two sides of the piston are respectively provided with one damping ring; and the super-elasticity SMA wire is uniformly wound on the insulation outer wall surface of the split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve fuses the material damping of a super-elasticity memory alloy, the dry friction damping and the damping ring damping to improve the vibration reducing performance, uses the structure of the periodic friction surface to enable once travel of the damper to include multiple loading and unloading processes of the super-elasticity SMA wire to effectively increase the vibration amplitude borne by the damper, can realize self-adaption rigidity and damping adjusting functions through control of the SMA wire, prevents the failure problem of a sealing piece, and is long in service life, wide in application range and high in reliability.

The invention discloses an anti-buckling low-frequency vibration isolation rubber support comprising a rubber support body and anti-seismic casing pipes arranged in the rubber support body. Laminatedrubber is adopted for the rubber support body. The low rigidity required by low-frequency vibration isolation is achieved by increasing the thickness of the rubber. The anti-seismic casing pipes are embedded in the support in the vertical direction and sequentially penetrate through the rubber support body from top to bottom, a restraining effect is achieved for the high-flexibility rubber supportbody in the horizontal direction, an anti-buckling function is provided for the rubber support body under the vertical large-load effect, and a horizontal earthquake resistance function is also provided for the support. Rubber layers or isolation gaps are arranged between the anti-seismic casing pipes and the rubber support body or between the anti-seismic casing pipes to avoid rigid contact, andthe environment vibration spreading route achieved through a rigid contact face is isolated. By means of the anti-buckling low-frequency vibration isolation rubber support, low-frequency vibration isolation of environment vibration can be achieved, high bearing stability and anti-seismic capacity can also be ensured, and the anti-buckling low-frequency vibration isolation rubber support can be used for vibration isolation of civil engineering structures and all types of instruments and equipment.

The invention discloses an assembling method for a low-pressure turbine shaft-disc assembly of an aero-engine. The assembling method comprises the following steps that workpieces are installed, the position and the posture of a turbine shaft are adjusted; the turbine shaft butts joint and is pre-installed; an indexable tightening system is fed to a front end operation area; a tightening shaft is tightened; and the indexable tightening system returns back. According to the assembling method for the low-pressure turbine shaft-disc assembly of the aero-engine, an assembly mode that an axis of a low-pressure turbine shaft-disc is horizontal is adopted, the position and the posture of the low-pressure turbine shaft with the large length are adjusted precisely and advantageously in the butt-joint process, centering positioning alignment and end face correct close fitting of the turbine shaft relative to a connecting disc are achieved, and the butt-joint and assembling precision is improved;a turbine shaft position and posture adjusting table is applied, quantitative position and posture adjusting is conducted on the low-pressure turbine shaft through a mechanical way, experiential methods such as traditional manual hanger operating are replaced, manual repeated trial assembly and correction are avoided, the butt-joint efficiency is improved, and assembly consistency requirements ofassemblies are met; and the indexable tightening system is adopted, worker skill requirements and the labor intensity are reduced, and the tightening efficiency is improved.

The present invention relates to a method of manufacturing an integrated structure using microbubbles, and an integrated structure manufactured by the method.

The invention discloses a novel active air foil bearing based on PZT and SMA. The novel active air foil bearing comprises a shaft sleeve, piezoelectric ceramics (PZT), a memory alloy wire mesh block (SMA block), flexible hinges, a rigid push rod, pre-pressure applying devices, a cooling pipe, a wave foil and a top foil; the PZT and the SMA block are installed in pre-machined through grooves, the corresponding pre-pressure applying devices are designed for the PZT and SMA block, the wave foil is formed by pressing an elastic material, one end of the wave foil is welded, and the other end of thewave foil is free. The top foil overlies the wave foil. Power supply signals of the PZT are controlled, the flexible hinges are coupled, PZT deformation is amplified, the wave foil is supported by the rigid push rod, the wedge-shaped space is enlarged, therefore, the crossed coupling effect is weakened, the dynamic pressure effect of the bearing is enhanced, and the rigidity characteristic of thebearing is improved; by controlling the temperature of the SMA block, the SMA block expands and contracts to generate larger structural damping, and the damping characteristic of the bearing is improved; and finally, the rigidity and damping characteristics of the bearing are actively controlled, and the stability of the system is improved.

Compositions comprising specific disodium hexahydrophthalate(HHPA) salts in combination with acid scavengers (such as organic calcium salts or dihydrotalcite complexes) that provide highly desirable and effective nucleating properties within polymer articles (such as polyolefins) are provided. Surprisingly, such a combination of HHPA salt and acid scavenger provides high crystallization temperatures, low haze, and/or high flexural modulus to the finished polymer product. Other sodium salt polymer nucleators (such as sodium benzoate) deleteriously react with calcium organic salt acid scavengers such that characteristically high crystallization temperatures are drastically reduced when in combination with calcium salts (such as calcium stearate). Also, sodium benzoate when combined with dihydrotalcite acid scavengers produce extremely high haze levels in the finished target polymer article, whereas the inventive compositions surprisingly reduce haze. The finished polymer articles comprising such an inventive composition are also contemplated within this invention.

The invention discloses a novel active air foil bearing. The bearing comprises a shaft sleeve, the PZTs, the flexible hinges, rigid push rods, precompression exertion devices, wave foil and top foil; the shaft sleeve is machined through wire cutting, three PZT mounting through grooves circumferentially and evenly distributed, the corresponding flexible hinges and the corresponding rigid push rods are obtained, the top ends of the rigid push rods are flush with the inner cylindrical face of the shaft sleeve, the PZTs are mounted in the through grooves, the corresponding precompression exertion devices are designed for the PZTs, the wave foil is formed by pressing of elastic materials, and is arranged on the shaft sleeve and the inner cylindrical faces of the rigid push rods, one end of the wave foil is welded to the inner round face of the shaft sleeve, and the other end of the wave foil is free. The top foil is arranged on the wave foil in a covering manner. Through control over power supply signals of the PZTs, the PZTs mechanically deform, the flexible hinges are enlarged to deform, and are supported through the rigid push rods to be attached to the wave foil on the push rods and the inner wall of the shaft sleeve, a gap between a bearing and a supporting rotor is changed, the wedge space is increased, the crossed coupling effect is weakened, the bearing dynamic pressure effect is enhanced, the rigid characteristic of the bearing is improved, and finally the aims of actively controlling the rigidity characteristics of the bearing and improving the stability of the bearing are achieved.

A modular space curved extendable mechanism containing flexible hinges comprises flexible extension rods, first rigid rods and second rigid rods, which are hinged by rigid hinges to each form a triangular unit, wherein a plurality of triangular units corresponding up and down form annular modules by hinged networks of the rigid hinges, the plurality of annular modules are hinged by the rigid hinges to form an expandable truss mechanism through array combination, the rigid hinges of the expandable truss mechanism and the expandable films are connected by cables to form a modular space curved expandable mechanism containing flexible hinges, and the expandable truss mechanism is self-driven and deployed by utilizing elastic potential energy at the flexible hinges. The modular space curved extendable mechanism provided by the invention utilizes a plurality of slotted flexible hinges with simple mechanism assemble, and can greatly reduce the overall quality of the expandable mechanism, reduce the collision and friction during the expansion of the expandable mechanism and improve the folding performance of the mechanism.

The invention relates to a parallel mechanism, in particular to a redundant driving parallel machine tool executing mechanism capable of avoiding singularity. The redundant driving parallel machine tool executing mechanism comprises a fixed platform, a first driving branch chain, a second driving branch chain, a redundant driving branch chain, a movable platform and a spindle tool bit assembly. According to the redundant driving parallel machine tool executing mechanism, the Z-direction moving stroke and X-direction and Y-direction rotational motion exist; the two driving branch chains connected with an output rod are redundant driving input, and the rotating posture of a tool bit part is adjusted by the redundant driving branch chain to avoid the singularity position so that the tool bitpart can rotate within a large machining range; and the first driving branch chain and the second driving branch chain are the same in structure, and the first driving branch chain, the second drivingbranch chain and the redundant driving branch chain are symmetrically arranged by 120 degrees in a circumferential mode. According to the redundant driving parallel machine tool executing mechanism with a singularity-avoiding characteristic, the flexibility is high, the machining range is large, the stiffness is high, and the redundant driving parallel machine tool executing mechanism can be suitable for the field of high-precision machining of machine tool complex spatial hook faces.

The invention discloses a dynamically-adjustable unilateral external fixator. A driving gear sleeve is connected with upper and lower locking clamps through a driving rod, the driving gear sleeve is connected with a driven sleeve gear through an upper needle clamp, a driving rod clamp is connected with the driving rod, and the driving rod clamp is connected with a driven rod clamp through a lowerneedle clamp; the movement distance of the driving gear sleeve on the driving rod can be adjusted through rotation of the driving gear sleeve, so that the compression distance between broken bones canbe changed, and load transfer between the two broken bones can be controlled; the upper and lower locking clamps can fix the driving gear sleeve on the driving rod, so that compression movement of the broken bones can be controlled at any time, the driven sleeve gear positions the driving gear sleeve on the driven rod according to the position of the driving gear sleeve, the angles of the upper and lower needle clamps can be adjusted freely by the aid of ball pairs, and the rigidness of the unilateral external fixator formed by the driving rod and the driven rod can be improved. Dynamic and static integration of the compression movement function between the load and the broken bones is realized, and the design is simplified.

The invention belongs to the technical field of high polymer material mixing modification, in particular to a polypropylene composite material and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 80-120 parts of polypropylene resins, 5-15 parts of reinforcing agents, 5-15 parts of toughening agents, 1-3 parts of coupling agents, 5-20 partsof flame retardants, 1-4 parts of dispersing agents, 1-5 parts of heat stabilizers, 7-25 parts of fillers, 1-3 parts of nucleating agents, 0.5-2 parts of gloss modifiers and 2-6 parts of weathering agents. The material has high appearance glossiness, good rigidity and strength performance, long service life, light weight and simple and easy preparation.

An electrically conductive composite consisting of Vinyl-ester (as an anti-corrosive matrix), woven carbon fibers (as the reinforcement and conductive material) and carbon black powder (as a conductive filler) is manufactured. Various weight percentages of the matrix, fibers and filler are examined. The product cured at room temperature. Low weight, high strength, high stiffness, chemically corrosive resistance, electrically conductive characteristics are obtained from the product. The product may serve as electrically conductive polymeric composites in chemically corrosive environment.

The invention relates to the field of industrial buildings, in particular to a reclamation-area factory building column foundation and a construction protection method thereof. The reclamation-area factory building column foundation comprises stand column foundation bodies and is characterized in that longitudinal adjacent stand column foundation bodies are connected with each other through a longitudinal concrete connecting beam, and the transverse-span adjacent stand column foundation bodies are connected with each other through a process push pipe; the process push pipe comprises supports, short pipes, lining pipes and pull pipes, and the supports are respectively arranged on bearing platforms of the adjacent stand column foundation bodies; one section of short pipe is arranged on each support, and a pull pipe is arranged between the short pipes of the adjacent factory building column foundations; the lining pipes are arranged in the connecting positions of the pull pipes and the short pipes, and the outer diameters of the lining pipes are in clearance fit with the inner diameters of the pull pipes and the short pipes; and pins are arranged on the outer diameters of the lining pipes, and one end of each pin extends out from a long hole at the end part of each short pipe. Compared with the prior art, the reclamation-area factory building column foundation has the benefits that the longitudinal deformation is limited by utilizing the longitudinal connecting beam, the problem that the deformation caused by the transverse load of the factory building column foundation is overlarge is solved by adopting the reusable process push pipes, and the steel consumption is saved.