1063 results about "Torsional rigidity" patented technology

A catheter assembly including a tapered steering spine having a varying stiffness along an axial length. The tapered steering spine is tailored to provide increasing flexibility from proximal to distal in a way that makes the bend radius more uniform along the length of the steering section. In one embodiment, the tapered steering spine includes structures on adjacent rings that engage with each other when the steering section is flexed to limit the minimum bend radius to a predetermined minimum and which enhances the torsional rigidity of the steering section regardless of the degree of flexure of the steering section. The limited bend radius can prevent excessive bending of components such as fiber optics. The enhanced torsional rigidity can negate the need for torque braid in the section of the catheter shaft that surrounds the tapered steering spine.

A strapping system for footwear comprises a strap (1) that has a first end (3) connected to a first side of a heel portion (12) of footwear, passes over the instep of a foot, through a channel (31) extending through the midfoot of the footwear sole and back over the foot instep to thereby forming an X shape over the wearer's foot. The strap (1) has a second end (11) which may be adjustably connected to the second side of a heel portion (12) of a sole. The channel (31) is resilient and rigid so as to allow the strap freedom of movement during use: thereby achieving a dynamic and self adjusting strap fit. A footwear sole comprises relatively soft forefoot and heel portions with a more rigid shank portion therebetween to provide the sole with stiffness and torsional rigidity.

The sole comprises three layers, including (a) an outer or ground contact sole (7) having flexibility, ground-gripping, and abrasion-resistance properties, (b) an upper or comfort layer (8) positioned directly beneath the foot and having elastic shock-absorption properties, and (c) an intermediate layer or rib (9) positioned directly between the upper portion of the contact layer (7) and the lower portion of the comfort layer (8) and having torsional rigidity properties which provide both for the distribution of shocks sensed by the contact layer (7) and for their diffusion over the comfort layer (8) before they come into contact with the foot (4).

A lightweight forward design method and system of automobile structure based on multi-performance constraints is disclosed. The finite element analysis model of automobile body structure is established by using finite element modeling technology. The typical force transfer path of automobile structure is identified by using topology optimization technology and the bending / torsional rigidity performance of automobile body is taken as constrained working condition, and lightweight design in conceptual stage is carried out. Then the strain energy analysis and the material thickness sensitivity analysis are carried out by using the sensitivity analysis technology, and the weak links and the critical design area of the vehicle body are found. Topography optimization is used to improve vehicle performance; Finally, based on business integration optimization software, The multi-performance target of automobile body is analyzed by integrated simulation, and the correlation between design parameters and performance, performance and performance is studied by using DOE sampling and data mining technology, and then the lightweight design of automobile body structure considering multi-disciplinary performance is carried out, which reduces the quality of automobile body structure, improves product performance, shortens R D and manufacturing cycle, and saves cost.

The invention discloses a comprehensive performance resting experiment table for a precision speed reduction device. The comprehensive performance resting experiment table comprises main components, such as a servo motor, an input end torque and rotational speed sensor, a high precision encoder, a measured speed reducer, a vibration noise and temperature sensor, an output torque and rotational speed sensor, a magnetic powder brake, and auxiliary components for connecting and fixing, such as a base, a horizontal sliding table, a coupling and a speed reducing mounting base; the comprehensive performance resting experiment table adopts the mode that the magnetic powder brake provides input end load, the input end of the servo motor is loaded, and angle, rotate speed, temperature, vibration and noise testing devices are added in the middle, so as to test the comprehensive performances of the precision speed reduction device. The comprehensive performance resting experiment table can accomplish testing of performances, such as transmission efficiency, torsional rigidity, vibration, noise and temperature rise, on one experiment table, and can test the comprehensive performances of different models of precision speed reduction devices. The comprehensive performance resting experiment table has the advantages of simple structure, high testing precision and high automation degree, and can meet the testing and detection requirements on the comprehensive performances of the precision speed reduction device.

A hood structure comprises an outer and an inner which form a closed cross section through spaces. The inner's cross-sectional shape is a sine curve, an nth-power-raised sine curve, or a spline curve having a corrugation length approximate to an outside head diameter. This corrugated hood structure can provide a uniform, excellent head impact resistance independently of impact positions on the hood. The corrugated hood structure also excels in tension rigidity, bending rigidity, and torsional rigidity. Accordingly, the car body hood panel structure satisfies requirements of head impact resistances for pedestrian protection and rigidity improvement such as the tension rigidity.

A battery unit comprises plural side connection portions which are provided at its both-side end portions in a vehicle width direction and connected to said vehicle-body member, and these connection portions are connected to a high rigidity portion of a vehicle-body member, concretely, to the vehicle-body member at a specified position where floor cross members integrally connected to a vehicle floor panel are located, to the vehicle-body member at a specified position where a torque box is located, or to the vehicle-body member at a specified position where a kick-up portion of the vehicle floor panel is located. Accordingly, the torsional rigidity of the vehicle body can be increased by utilizing the battery unit mounted below the vehicle body floor (vehicle floor panel).

Footwear is provided having a midsole platform, a full length insole and a orthotic midsole in the form of an orthotic shell received between the midsole platform and the insole. The orthotic shell has a heel portion to support a heel of a foot of a wearer and a forefoot portion to support a forefoot of the wearer at least in a region behind and near metatarsal heads of the foot. The orthotic shell is shaped to partially cup the heel and support the forefoot in one of a plurality of determined orientations. The footwear may further include a plurality of support plugs to support the orthotic shell in one of the determined orientations and a shank coupled to the midsole platform to increase torsional rigidity of the footwear with respect to a longitudinal length thereof. Methods of making footwear are also provided.

An improved, lightweight suspension fork for a bicycle with variable travel capability that maintains excellent torsional rigidity. This suspension fork allows for adjustable suspension travel adjusted at the handlebars of the bicycle. The suspension system includes a travel adjustment knob located at the handlebars of the bicycle. The travel adjustment knob is keyed with the main shaft of the suspension system so as to allow turning of the main shaft. Located on the main shaft within the suspension system housing is a length adjuster mechanism. The length adjuster moves linearly with respect to the housing as the main shaft is turned pulling the inner tube member of the suspension housing up or down relative to the outer tube section of the suspension housing, thereby changing the stroke of the suspension system.

An improved bicycle rear suspension system with a triangular wheel suspension component comprising three members; a planar truss chainstay member with a wide lateral side and a thin vertical side, adapted to be longitudinally and laterally rigid and vertically flexible; a seatstay member with an integrated shock absorbing means adapted to dampen the suspension movement, the shock absorbing means being a long-travel, short-length shock absorber with angular deflection capability; and a seat tube member, arranged in a triangular configuration wherein one, two, or all three junctions between the members are pivotless, thereby eliminating rotating pivot elements and providing a low maintenance requirement, durability, high reliability, low manufacturing costs, progressive springing and damping, a comfortable ride, a compact size, and light weight, while increasing lateral and torsional rigidity and wheel travel, and maintaining the strength and aesthetic appeal of the traditional diamond frame.

The invention discloses a polycarbonate (PC) composite bridge with corrugated steel webs and a construction method for the PC composite bridge. The PC composite bridge comprises a concrete top plate, a concrete bottom plate and two double-corrugated steel webs; the bottom surface of the concrete top plate and the concrete bottom plate are provided with upper and lower profiled steel sheets; each double-corrugated steel web comprises two layers of corrugated steel plates and a plurality of connecting pieces; concrete is filled between the two layers of corrugated steel plates; the connecting pieces are connected between the two layers of corrugated steel plates, so that the two corrugated steel plates work together and the aim of greatly improving bending rigidity and torsional rigidity is fulfilled; the upper ends of the double-corrugated steel webs are connected with steel top plates connected with the upper profiled steel plate; and the lower ends of the double-corrugated steel webs are connected with steel bottom plates connected with the lower profiled steel plate. The double-corrugated steel webs are integral, the bending rigidity and torsional rigidity are improved by more than 4 times, the stability is high during construction, and the application range of the bridge is widened; and the profiled steel plates are adopted, so that formwork supports for the concrete top plate and the concrete bottom plate are eliminated during construction, construction without formworks and with a few supports is realized, the cost is reduced and the construction period is shortened.

The invention provides an automobile body-in-white light weighting analysis method. The method comprises following steps: setting each optimization size of automobile body-in-white as a design variable and setting the modal frequency value of each stage, bending rigidity value, torsional rigidity value and maximum principal stress at all extreme work conditions of the automobile body-in-white as target functions; performing experiment design and simulation calculation on each design variables to obtain response function values corresponding to each design variable and according to the response function values, establishing a simulation model; based on the simulation model, performing multiple discipline and multi-target optimization on the design variables to obtain Pareto solution set of the variables. According to the automobile body-in-white light weighting analysis method of the invention, through selecting proper design variables, analysis methods and technical routes, the light weighting of automobile body-in-white is realized and at the same time, on the basis of satisfying multiple discipline and multi-target, the optimized size parameters of the automobile body-in-white among all performances can be found.

The invention provides a multifunctional gear transmission testboard, which includes an electric motor, a torque revolving speed sensor, a gearbox and a brake, wherein the gearbox includes one input shaft, two intermediate shafts and one output shaft which are all mounted in parallel. According to the invention, shafts at different positions and corresponding gears in the gearbox can be dismounted on a base of a testing platform, so as to form a stand-alone power two-branch gear transmission wheel train structure, a two-stage expanded gear transmission wheel train structure, a single-stage independent torsion type gear transmission wheel train structure and a single-stage gear transmission wheel train structure; gears with web boards of different thicknesses and shafts of different diameters can be replaced to vary the rigidity of web boards of the gears and the torsional rigidity of the shafts, so that the dynamic performances of the power two-branch transmission system under different rigidity of the web boards of the gears and the torsional rigidity of the shafts can be studied, and testing support for rigidity of the web boards and the shafts can be provided.

A tilting rotor of a convertible aircraft comprises, between the mast and the hub, a constant velocity drive mechanism and pivoting arrangement comprising two gimbals, each of which is driven by the mast and pivots about one respectively of two diametral axes by two diametrically opposite bearings. Each gimbal is also hinged to the hub by ball joint connections diametrically opposite and centred respectively in a radial plane passing through the axis of the mast and through the diametral axis about which the other gimbal pivots. The two resulting trains transmitting torque between the mast and the hub have substantially the same torsional rigidity, and one at least of the components of each torque transmission train exhibits a flexibility in deformation about the axis of rotation of the hub.

The invention discloses a streamlined steel-concrete superimposed box girder, which relates to the technical field of bridge engineering and is used for a long-span bridge girder. Two sides of the superimposed box girder are provided with tuyere structures, and a bridge panel adopts a superimposed structure consisting of prefabricated concrete slabs and a post-poured concrete layer. When the box girder is in use, the superimposed box girder is a streamlined single-box single-chamber or single-box multi-chamber cross section; the tuyere structures are polygonal open thin-walled structures; and longitudinal-transverse prestress is applied in the superimposed bridge panel. The box girder effectively improves the torsional rigidity and wind-resistant stability of the section of the girder, remarkably improves the integrity and durability of the bridge panel, and expands the application of superimposed girders in cable-stayed bridges and other long-span bridges.

The invention provides an aeroelastic flutter generator, which comprises a wing panel, a platform, a translation return mechanism which is coupled between the platform and the wing panel, and a torsion return mechanism which is coupled between the platform and the wing panel. The aeroelastic flutter generator can make the aeroelastic phenomenon easy to be observed by naked eyes and make the sinkage rigidity and the torsional rigidity adjustable, and has limitation protection.

The invention provides an optimum design method of a non-bearing frame structure of a light vehicle. The optimum design method comprises the steps of establishing a three-dimensional geometrical model of the original frame structure of the light vehicle by use of SolidWorks software and outputting the model in the IGES (Initial Graphics Exchange Specification) data file format, thereby obtaining the IGES model of the frame structure, next, reading the IGES model of the frame structure in Hypermesh software, performing geometrical processing and dividing finite element meshes by use of the Hypermesh software, and performing topological optimization on the cross beam structure of the frame by use of the structure optimization function of the Hypermesh software without changing the structural forms of the longitudinal beam and the attached seats of the frame, thereby realizing the optimum design of the arrangement position and the structural form of the cross beam structure. The optimum design method of the non-bearing frame structure of the light vehicle is capable of improving the bending rigidity and torsional rigidity of the frame of the light vehicle and the inherent frequency of the frame structure without increasing the weight of the frame structure, thereby ensuring that the frame has relatively high overall rigidity and improving the reliability, security, operation stability and vibration property of the vehicle.

A vehicle suspension provides increased auxiliary roll stiffness by utilizing spring assemblies having a thick truncated half-leaf, a thin full-leaf, and a thin truncated half-leaf located opposite the thick truncated half-leaf. The thick truncated half-leaf increases the torsional rigidity of the spring assembly in order to increase the leaf twist sub-component of auxiliary roll stiffness and increases the bending rigidity of half of the spring assembly in order to increase the axle torsion sub-component of auxiliary roll stiffness. The thin full-leaf provides structural integrity, and the thin half-leaf allows tuning of the overall vertical spring rate of the suspension and limits the leaf stresses in the thin full-leaf.

The invention discloses an RV reducer comprehensive test bench, which can test multiple performance parameters such as the angle transfer error, the return difference, the torsional rigidity, the service life, the temperature rise, the efficiency and the torque of the high-precision RV reducer. The RV reducer comprehensive test bench comprises a base, and a servo motor, a linear motor, a first torque sensor, a first high-precision angle encoder, a to-be-tested RV reducer bracket, a mounting flange disc, a temperature sensor, a second torque sensor, a second high-precision angle encoder, a diaphragm coupling and a brake arranged above the base. The mounting flange disc can be replaced, and thus, test on reducers of multiple types can be realized. compared with other test instruments, the RV reducer comprehensive test bench of the invention has the advantages that the test efficiency and the test precision are greatly enhanced; the performance is reliable; the test repetition is good; the operation for replacing a tested object is simple; the mounting and positioning precision is high; and the cost is low.

A device for cutting tissue including (a) an elongated shaft body defining a drive lumen, (b) a cutting head extending from a distal end of the elongated shaft body and being rotatable via a drive shaft disposed within the drive lumen, and (c) a retainer for keeping the cutting head attached to the shaft body if the cutting head becomes detached from the drive shaft or if the drive shaft breaks. A flexible drive shaft including (i) a core configured for resisting helixing, and (ii) at least one outer layer configured for transferring torque. A method of producing a flexible drive shaft including providing a core configured for resisting helixing, and wrapping the core with at least one outer layer of wires configured for maintaining high torsional rigidity. Related apparatus and methods are also described.

A wheelhouse reinforcement bracket is provided for the rear wheelhouses of an automotive vehicle to increase torsional rigidity for the vehicle. The wheelhouse bracket is positioned in alignment with the location on the vehicle body where the shock absorber is located, and in alignment with the rear suspension cross member to create a structural ring formed by the wheelhouse bracket, the C-pillar and the rear suspension cross member. The wheelhouse bracket is formed with a mounting flange positionable within the inside of the U-shaped rear side rail to facilitate welding thereto instead of being welded to the top of the underbody floor structure. The mounting flange has a first portion configured to be mated against a first generally vertically extending wall of the rear side rail and a second portion configured to be mated against a generally horizontally extending wall of the rear side rail.

The invention discloses a torsion quasi-zero stiffness vibration isolator. The torsion quasi-zero stiffness vibration isolator is mainly composed of a negative-stiffness cam-roller-radial spring mechanism and a positive-stiffness rubber spring vulcanized on a first coupling and a second coupling, and is further provided with a radial spring supporting component used for supporting a radial spring and guaranteeing that the radial spring only deforms in the radial direction. When the first coupling and the second coupling rotate relative to each other, the cam-roller-radial spring mechanism generates negative torsion stiffness, the rubber spring has positive torsion stiffness; under the parallel combination of the positive-stiffness element and the negative-stiffness element, the vibration isolator has the high static stiffness and low dynamic stiffness characteristic that the vibration isolator can bear large static loads, namely, the vibration isolator can transmit large static torque. The stiffness is zero at the static balance position, and the micro stiffness characteristic is shown near the static balance position. Thus, the vibration isolator can isolate ultralow-frequency torsion vibration of a shaft system.

Improved splitboard boot bindings for backcountry splitboarding are disclosed. Each of a pair of soft-boot bindings is provided with an integral boot binding lower that conjoins the two halves of a splitboard without the additional weight or height of an adaptor mounting plate, upper binding baseplate or “tray”, and extra fasteners of the prior art. The boot binding lower is formed as a modified sandwich box girder or modified monolithic box girder and provides improved torsional stiffness for splitboard riding. When subjected to a torque applied by the rider, the bottom mediolateral flanges of the box girders are configured to contactingly engage the top face of the splitboard, thereby dynamically coupling the rider's boot sole and the board via a single rigid structure. In a preferred embodiment, the web or “spacer” members are characterized by an aspect ratio or contour height that is varied from heel to toe.

The invention relates to the technical field of computer aided engineering (CAE), in particular to a CAE (computer aided engineering)-based car body rigidity analysis method used for analyzing the bending rigidity and the torsional rigidity of a front longitudinal beam, a threshold and a rear longitudinal beam of the car body. The CAE-based car body rigidity analysis method comprises the following steps: establishing a finite element mesh model of the car body and a coordinate system; carrying out a simulation test by applying load and constraints; obtaining a processing result, and generating a curve; then, judging whether the processing result meets requirements; if the processing result meets the requirements, storing the processing result, and otherwise, establishing a finite element mesh model of the car body again to conveniently carry out a simulation test. In the method, the displacement and the torsion angle of a node are analyzed by the finite element mesh model of the car body to carry out rigidity analysis instead of calculating by selecting the node by experience, and therefore the result is more accurate; an analysis result is automatically obtained, the workload of engineers is lightened, and project development time is saved; the result can be returned to zero to make the result to be normalized, the result has high compatibility, and comparison and analysis can be conveniently carried out.

The invention provides a battery mounting and fixing structure of a purely electric automobile, which comprises a rear floor front cross beam assembly, a rear floor rear cross beam, left and right rear longitudinal beams and rear longitudinal beam battery left and right mounting frames. The rear floor front cross beam assembly is mounted on the front ends of the left and right rear longitudinal beams by bolts and connected with a rear floor; the two ends of the rear floor rear cross beam are arranged on the rear ends of the left and right rear longitudinal beams by bolts and connected with the rear floor; and the rear longitudinal beam battery left and right mounting frames are welded with the middle parts of the let and right rear longitudinal beams respectively. The rear floor front cross beam assembly, the rear floor rear cross beam and the rear longitudinal beam battery left and right mounting frames are provided with battery mounting holes respectively. The fixing structure is a frame structure, can reasonably bear the weight of a battery pack and optimize the torsional rigidity of the vehicle body, and is excellent in assembly process and convenient in mounting and detachment.

A method for producing a silicon torsion spring capable, for example, of reading the rotation rate in a microstructured torsion spring / mass system. The system that is produced achieves a low torsional stiffness compared to a relatively high transverse stiffness in the lateral and vertical directions. The method proceeds from a wafer or wafer composite and, upon suitable mask coverage, a spring with a V-shaped cross section is formed by anisotropic wet-chemical etching which preferably extends over the entire wafer thickness and is laterally delimited only by [111] planes. Two of the wafers or wafer composites prepared in this way are rotated through 180° and joined to one another oriented mirrorsymmetrically with respect to one another, so that overall the desired X-shaped cross section is formed.