202 results about "Longitudinal deformation" patented technology

The invention discloses a tunnel full-section high-speed dynamic health detection device based on an active panoramic vision. Hardware of the device comprises a tunnel detection trolley, an active panoramic vision sensor, an RFID reader and a processor. System software comprises an omnibearing face laser information analysis and point cloud data obtaining unit, a tunnel center axis extracting unit, a noise reducing and adjustment processing unit, a three-dimensional modeling and deformation analyzing unit, a full tunnel all-section cross section benchmark database, a full tunnel longitudinal section splicing unit, a displacement monitoring and sedimentation monitoring unit, a full tunnel health examination result database and a tunnel longitudinal section variable shift amount three-dimensional visualization unit. Transverse and longitudinal deformation of a tunnel are analyzed and recognized by carrying out machine vision processing on laser scanning fracture surface slice images of the inner wall of the tunnel. The invention further provides a tunnel full-section high-speed dynamic health detection method based on the active panoramic vision, and effective technology support is provided for daily maintenance of tunnels of metros and high-speed rails.

The piezoactive actuator with amplified movement comprises a first sub-assembly formed by a mechanical movement amplifier and a second sub-assembly equipped with piezoactive elements. An interface with a load and an interface with a base, respectively placed at the peaks of a small axis of the shell and designed for actuating the load with respect to the base, define an actuating axis. A longitudinal deformation of the large axis enables a deformation of the small axis to be induced, designed to generate a movement at the interface with the load, the component of which movement along the small axis is amplified. At least one zone made of elastomer material is arranged at least substantially along the actuating axis to dampen deformations and increase the capacity of the actuator to resist external stresses. The actuator comprises at least one free space adjacent to the elastomer material zones in a direction orthogonal to the actuating axis.

The invention concerns a so-called capstan winch (1) comprising drums (2, 3) driving a cable (C) and provided with a peripheral wall (22, 32) around which are strung independent peripheral rings (40–45, 50–55). Said rings are provided with a peripheral groove designed to receive the cable (C) and are made of an elastic material so as to allow both the cable (C) to be driven and a relative sliding movement between the peripheral rings (40–45, 50–55) and the peripheral wall (22, 32), the relative sliding movement being of amplitude substantially equal to longitudinal deformation of the cable (C), when it is subjected to tension stresses. The two drums (2, 3) can be axially offset relative to each other (p/2) and their axes of rotation (Δ₁, Δ₂), may form a non-null angle of inclination. The invention is particular applicable to deep sea oil exploration.

The invention provides a track structure of magnetic floating traffic, comprising a track beam, railroad ties supported and fixed on the track beam via a connecting structure and a track supported and fixed at two sides of the upper surface of the railroad ties, wherein the connecting structure comprises a fixer and a concrete block, the railroad tie is made from hollow square steel tube. The invention also provides a relative production, comprising that preparing the track beam with preformed holes, preparing a track arranger formed by a track and railroad ties, while the railroad tie is made from hollow square steel tube, connecting and fixing the arranger on the track beam via the connecting structure, while the connecting structure comprises a fixer and a concrete block. The invention uses square tubular steel railroad ties to improve the rigidity, distortion resistance, and longitudinal deformation resistance, to improve the safety and reliability of the track, and uses a novel flexible buckle plate to make installment easy and improve vibration proof ability.

The invention provides a metal damper and a design method thereof, and belongs to the technical field of civil engineering structural shock absorption. The damper comprises an upper cover plate, a lower cover plate and a core energy-consuming metal element. The core energy-consuming metal element is a continuous U-shaped slotted metal plate and comprises a circular arc section and two straight sections. A plurality of continuous grooves are formed in the circular arc section and partial straight sections of the slotted metal plate in the width direction at intervals. In design, firstly, the height of the damper is determined according to a building; secondly, the numerical relationship of the thickness of a steel plate, the length of the straight sections and the width of the damper is obtained according to an in-plane resilience formula and an out-plane resilience formula; specific numerical values of the three parameters are adjusted according to an optimizing formula, so that a failure mode, out of expectation, of the damper does not occur; and ultimately, the number of the dampers and the size of a bolt are determined. According to the metal damper and the design method of the metal damper, energy consumption is achieved through metal materials with strong plastic deformation capacity, large longitudinal deformation is achieved through bending deformation, and large sideward deformability and anti-fatigue performance are achieved.

The invention discloses a high-temperature-resistant silicone rubber foam material and a preparation method thereof. The preparation method of the high-temperature-resistant silicone rubber foam material is characterized by comprising the following steps: mixing 100 parts of silicone rubber base stock, 20-35 parts of a reinforcing agent, 2-3 parts of a structure controlling agent, 0-0.2 part of colour master batch, 60-150 parts of a pore-forming agent and 4-5 parts of a radiation sensitizer, moulding, crosslinking through gamma ray radiation, forming pores through subsection dissolving-out, and drying, so that the silicone rubber foam material which is resistant to high temperature of 250 DEG C and still maintains excellent performance after equivalent time of 20000 hours can be obtained. The preparation method of the high-temperature-resistant silicone rubber foam material has the advantages that radiation crosslinking and dissolving-out pore forming are combined, so that crosslinking is uniform, control is easy, energy conservation and environmental protection are realized, a technology is concise, reproducibility is good, and production efficiency is high; the high-temperature-resistant silicone rubber foam material still maintains high tensile strength, high weight loss, low longitudinal deformation and low surface hardness after the equivalent time of 20000 hours at the temperature of 250 DEG C, permanent compressive deformation is slightly increased, the high-temperature-resistant silicone rubber foam material does not become brittle or hard, and the high-temperature-resistant silicone rubber foam material can serve as filling and positioning, sealing cushion, cable insulation as well as buffer and vibration-absorptive materials or parts which are used in high-temperature environment.

The invention discloses a unidirectional lead core rubber vibration insulation support which comprises an interlayer steel plate, interlayer rubber, outer wrapping rubber, upper seal plate, a cover plate, a lead core, a Teflon sliding plate, a stainless steel plate, an upper support plate, a lower support plate, limiting plates, an upper connecting plate, a lower connecting plate, an anchor bolt, a lateral stainless steel bar and a guide sliding strip. The led core is tightly pressed into a support reserved hole, and the cover plate is arranged on the lead core. The Teflon sliding plate and the stainless steel plate form a support sliding face, and lubrication between the stainless steel plate and the Teflon sliding plate is conducted through silicone grease. The upper seal plate is bonded with the Teflon sliding plate which is provided with the surface coated with epoxy resin and is subjected to surface activation treatment. The limiting plates are arranged on all the side edges of the upper support plate and allow longitudinal sliding but limit transverse moving. By means of the unidirectional lead core rubber vibration insulation support, the problem that a total link bridge length is large or large longitudinal deformation generated under the conventional load action may be restrained when the vibration insulation support is adopted for a large stride bridge is solved, the application range of the vibration insulation support is broadened, and vibration resistance of the overall bridge is improved.

The invention belongs to the field of welding, and relates to a laser welding method combining ultrasonic welding with chilling. According to the method, cooling water is applied to the back surface of a welding seam with a certain distance behind a molten pool in the welding process, and ultrasonic vibration is applied to the front surface; the temperature and the flow of the cooling water are determined according to the welding mode used; and the ultrasonic application position, power and force are adjusted according to the mechanical properties of sample materials. According to the method,the welding residual stress can be effectively reduced, and air holes and cracks are reduced, so that the fatigue performance of the welding seam is improved, and meanwhile, transverse and longitudinal deformation of welding is reduced. Longitudinal residual stress and deformation can be effectively reduced through chilling and welding. The ultrasonic impact can counteract the transverse stress caused by chilling and welding, and further inhibit longitudinal stress, so that deformation is effectively reduced; and the acoustic streaming effect and cavitation effect of the ultrasonic can refinecrystal grains and reduce the air holes and cracks, so that the fatigue performance of the welding seam is improved.

The invention relates to a method of testing Poisson's ratio of concrete. The method includes: performing testing by pressurizing in static elastic modulus test, selecting a concrete specimen of specified size, selecting a specified test area on the concrete specimen and a test scheme, placing transverse strain gauges at the centers of two opposing sides of the concrete specimen, placing longitudinal strain gauges at positions, determined distances away from the upper and lower end faces, on two longitudinal sides of the concrete specimen, precisely measuring and recording transverse deformation and longitudinal deformation, and calculating the Poisson's ratio of the concrete through the transverse deformation, the longitudinal transformation and a conversion coefficient. The method has the advantages that measuring is precise and fast, testing cost is lowered and repeatability is good.

The invention provides an inflatable car radial tire with a low-rolling resistance tread contour. Under the condition that other properties of the tire are not reduced, the purposes of improving the grounding condition, improving the deformation when the tire is in contact with the ground as well as reducing the tire rolling resistance are achieved by improving and controlling the tire tread contour shape. The tire comprises a tread, and the contour of the tread is sequentially divided into a first-section crown arc and a second-section crown arc on a tire radial section from the intersection of a tire equatorial plane and a tire tread contour to a tire crown at the starting part of a tire shoulder; the outer diameter R1 of the first-section crown arc, the outer diameter R2 of the second-section crown arc and the outer diameter R3 of the tire tread contour at the tire shoulder have the following relationship: 0.43<=R1/R2<=1 and 0.43<=R2/R3<=1; and the arc length alpha of the first-section crown arc, the arc length beta of the second-section crown arc and the tread width TDW have the following relationship: 0.33<=alpha/beta<=3 and 0.11<=beta/TDW<=0.431. According to the invention, by controlling smooth transition from the tire crown to the tire shoulder, the uniform distribution of stress in the tire grounding process is ensured, the horizontal and longitudinal deformation of the tire in a running process is reduced, and the tire rolling resistance is reduced.

The invention relates to a bridge widening structure adopting corrugated steel sheet connecting parts and a construction method thereof. The bridge widening structure comprises a new bridge, an old bridge and a joint crack. The old bridge and the new bridge are transversely connected through the joint crack. The corrugated steel sheet connecting parts for connecting an edge beam flange plate of the old bridge and an edge beam flange plate of the new bridge are arranged in the joint crack. The corrugated steel sheet connecting parts comprise vertically-arranged corrugated steel sheets and bolts. The corrugated steel sheets are arranged between the edge beam flange plate of the old bridge and the edge beam flange plate of the new bridge and connected with the edge beam flange plate of the old bridge and the edge beam flange plate of the new bridge respectively through the bolts. Long-strip-shaped holes allowing the bolts to penetrate are formed in the straight sheet sections on the two sides of the corrugated steel sheets, and the bolts are friction type high strength bolts. According to the bridge widening structure, it can be guaranteed that longitudinal deformation of a main beam of the new bridge is not restrained by a main beam of the old bridge, transverse bridge direction bending deformation generated by the new bridge and the old bridge obtained after widening is reduced, shear failure of an old bridge support is avoided, and the use performance of the widened bridges is guaranteed; the construction period is shortened, and good economic benefits are achieved.

A rigidity-variable positioning device for a bogie axle box of a railway vehicle comprises a vertical elastomer and longitudinal elastomers. The vertical elastomer is arranged between the top face of an axle box bearing saddle and the bottom face of a side-rack guide frame. The longitudinal elastomers are arranged between the axle box bearing saddle and the front lateral side as well as the back lateral side of the side-rack guide frame respectively. Each longitudinal elastomer at least comprises a low-rigidity elastic element and a high-rigidity elastic element. The low-rigidity elastic elements are arranged in elastomer pre-compressing devices and are connected with the large-rigidity elastic elements in series under the action of pre-compressing loads F1. The longitudinal elastomers have large longitudinal compression rigidity on the condition of small longitudinal deformation and displacement quantity, and can ensure the railway vehicle to have a high snakelike critical speed during linear running to meet the need of accelerated running of the vehicle; the longitudinal rigidity of the longitudinal elastomers starts to decrease on the condition that the longitudinal deformation and displacement quantity reaches a preset level, so that proper horizontal force between wheel tracks when the railway vehicle runs on curved tracks can be guaranteed, and further, safety in curve running of the vehicle is guaranteed.