212 results about "Bending beam" patented technology

A cassette-based power measuring apparatus includes a power sensing arrangement mounted within a cavity defined by a hollow bicycle cassette. The power sensing arrangement includes a torque sensing assembly including torque sensing elements configured to measure a user applied torque. The torque sensing elements are in communication with an electronics assembly configured to process the measured data and transmit it to a receiver. The torque sensing assembly may comprise a torque tube or a series of bending beams secured between a rear plate of the cassette and a freehub. The torque tube or bending beams may include strain gauges bonded thereto for measuring strain induced by application of forces in response to user-applied power.

A 3D acceleration / vibration sensor for fiber grating comprises three measurement probes respectively fixedly arranged on a right plane, an upper plane and a front plane of a pedestal vertical to each other and corresponding to x, y and z axes to form a mutually vertical position relationship, wherein each measurement probe is connected with an optical splitter through a single-mode fiber at one end, and the other end of the optical splitter is respectively connected with a light source and wavelength demodulation equipment through a single-mold fiber. The measurement probe comprises a bending beam fixed on the pedestal plane, fiber gratings adhered on the surface of the bending beam along the axial direction of the bending beam and a mass block fixed on the free end of the bending beam, wherein one ends of the fiber gratings are connected with the optical splitter through a single-mold fiber. The invention adopts a fiber Bragg grating as the sensor, and adopts three fiber gratings for measuring three mutually vertical components of a spatial 3D acceleration, thus achieving measurement of the spatial 3D acceleration by vector superposition of the three components. The sensor can be used for sensing spatial 3D acceleration or vibration parameters.

A slide clamp includes a slot formed in a plate though which a fluid tube is mounted. The tube may be moved to a flow section of the slot or to an occluding section of the slot. Interconnecting the flow and occluding sections is a pinch zone in which the slot is narrower than the occluding section. Because of this narrow slot, the pinch zone resists movement of the tube from either the occluding or the flow sections into another section. The pinch zone includes a pair of curved beams that are formed as a result of apertures formed in the plate at locations laterally outward from the slot of the pinch zone. As a tube is forced from the occluding section to the flow section the curved beams flex outwardly permitting the tube to pass. However, if enough force is not applied to the tube, it will not overcome the curved beams and they will stop movement of the tube. After the tube has passed, the curved beams resiliently return to their rest position once again providing a stop. The beams are symmetrically shaped and will permit movement of the tube in either direction. The apertures also provide identification markers for the slide clamp.

The invention relates to a vehicle frame with full load, wherein the whole vehicle, via front surround skeleton, back surround skeleton, left surround skeleton, right surround skeleton, top cover skeleton and bottom support, forms one integrated frame, to improve the fastness of frame. Via each node, upright post, longitudinal beam, incline support, horizontal bema, bended beam, or plates, the front and back of frame are through, the upper and lower are through, and the left and right are connected to form a closed force loop; therefore, the force can be distributed to everywhere of frame, to be functioned uniformly and avoid supporting on one point; and the structure is formed by rectangle steel tubes whose strength is 3-6 times of common vehicle with reduced weight. With said invention, the deformation of impacted vehicle is minimum to protect passengers.

A bending beam load cell can be compensated for side-to-side off center load sensitivity by simple electrical adjustments if a pair of shear sensing strain gages are bonded to each bending beam midway between axial strain gages used to measure bending strains. The shear sensing strain gages measure torque on the load cell, and are incorporated in bridge circuits that make it possible to vary the amount of torque sensitivity correction by changing the value of a trimming resistor. The bridge circuits also include circuit components for compensation of front-to-back off center load error and for zero adjustment. Four strain gages on each bending beam can be part of a single composite strain gage element, so the shear sensing strain gages do not add any cost to the load cell. Such a load cell can also be hermetically sealed before any compensation of offset load errors is done.

The invention discloses a distributed fiber optic sensing technology and a system for monitoring of deformation of a high arch dam, which relate to the field of crossing of a dam safety monitoring technology and a fiber optic sensing technology and are used for overcoming the defect of a conventional means for the monitoring of the deformation of the high arch dam and filling the blank of using distributed fiber optic sensing for the monitoring of the deformation of a dome dam. Aiming at the characteristics and the difficulties of the dome dam, two kinds of unique curved fiber optic packaging structures, namely, fiber optic monitoring panels in a weakly curved beam type and a micro-bending beam type, are provided. Based on error analysis and curved beam height control-camber beam segmentation construction, excellent performance, high reliability, long service life, convenience and practicability of monitoring of fiber optic deformation are ensured. A convenient and practical layout installation mode in an arch dam and a gallery, a vertical shaft and a footrill of a dam foundation is provided, so that online remote metering on multi-dimensional and large-scale time-space broad coverage of three components (radial horizontal displacement, tangential horizontal displacement and vertical displacement) of internal deformation of the arch dam, the dam foundation and a dam abutment is realized. An optical demodulation instrument is multifunctional and can be used for metering concrete temperature, reservoir water temperature, slit level in front of a dam, reservoir sedimentation and the like.

A new and useful load-limiting device for a vehicle occupant restraint is provided. The load-limiting device comprises a longitudinal, load-limiting member connected between the vehicle occupant restraint and an anchor point such as a vehicle seat or a structural part of the vehicle. The load-limiting member is configured to deform plastically to dissipate forces applied to the load-limiting member by the vehicle occupant during a crash. Moreover, according to the preferred embodiments, the design of the load-limiting member provides a new and useful form of plastic deformation to dissipate forces applied to the load-limiting member by the vehicle occupant restraint. Specifically, in one embodiment the load-limiting member comprises a deformable strip with a pattern of perforations disposed in staggered rows extending transverse to the strip. In another embodiment the load-limiting member comprises a deformable tube with a pattern of perforations disposed in staggered rings extending about the central axis of the tube. The configuration of the load-limiting member provides a plurality of beam like segments that deform progressively, and with bending beam characteristics, to dissipate forces applied to the load-limiting member by the vehicle occupant during a crash.

Microelectromechanical (MEM) buckling beam thermal actuators are disclosed wherein the buckling direction of a beam is constrained to a desired direction of actuation, which can be in-plane or out-of-plane with respect to a support substrate. The actuators comprise as-fabricated, linear beams of uniform cross section supported above the substrate by supports which rigidly attach a beam to the substrate. The beams can be heated by methods including the passage of an electrical current through them. The buckling direction of an initially straight beam upon heating and expansion is controlled by incorporating one or more directional constraints attached to the substrate and proximal to the mid-point of the beam. In the event that the beam initially buckles in an undesired direction, deformation of the beam induced by contact with a directional constraint generates an opposing force to re-direct the buckling beam into the desired direction. The displacement and force generated by the movement of the buckling beam can be harnessed to perform useful work, such as closing contacts in an electrical switch.

The present invention relates to a self-weight influence-free concrete material fracture toughness testing method, and belongs to the technical field of physical measurements. The determination method comprises: 1) erecting a test beam on two rolling bearings of the current three-point bending beam test device, and arranging a load measurement device and a strain measurement device on the test beam; 2) measuring the applied maximum load Fmax through the load measurement device, and measuring an initiation fracture load FQ through the strain measurement device; and 3) calculating an unstable toughness and an initiation fracture toughness. With the self-weight influence-free concrete material fracture toughness testing method, influence of the member self-weight on the testing result is eliminated so as to accurately determine the concrete initiation fracture and unstable toughness and meet the initiation fracture and unstable toughness determination requirements of the concrete material (including hydraulic concrete) of the high crack-depth ratio or large size specimen.

A motor vehicle has at its front end a pair of passing or dipped beam headlights and a separate pair of headlights which are cruising or main beam headlights. The passing lights and cruising lights produce, respectively, a regulation, short range, dipped passing beam and a regulation, long range, main or cruising beam. The lighting apparatus which comprises the four headlights further includes a control unit which, when the vehicle is negotiating a bend in passing beam mode, causes at least one of the main beam lights to emit an additional bend beam for lighting into the bend. This bend beam increases the light intensity generally in the direction of the bend.

A low cost, pendulous, capacitive-sensing Micro Electro-Mechanical Systems (MEMS) accelerometer is provided. The accelerometer includes a pendulous proof mass, one or more securing pads, and one or more flexures coupled with the pendulous proof mass and the one or more securing pads. The flexures flex linearly with respect to motion of the pendulous proof mass. First and second capacitor plates are positioned relative to the pendulous proof mass for detecting motion of the proof mass according to a sensed difference in capacitance. One or more strain isolation beams are connected between the one or more flexures and the pendulous proof mass or the securing pads. The strain isolation beams protect the flexures from mechanical strain.

The invention relates to a damping tester of three-point bended beam large-scale material, which can solve the problem of present device that can not test the damping property of large-scale material. Wherein, two ends of three-point bended beam (5-2) are fixed on each hinge base of base; each hinge base is vertically fixed via press beam (5-3); the middle part of three-point bended beam (5-2) is fixed with a load head; the force sensor (4-1) is connected to the load head, the actuator (3-3) and the charge amplifier (4-3); the power amplifier (3-2) is connected to the actuator (3-3) and the signal generator (3-1); the displacement sensor (4-2) is connected to the voltage amplifier (4-4); the charge amplifier (4-3) and the voltage amplifier (4-4) are connected to the data collector (4-5). The invention can complete the damping test of large-scale material.

The invention provides a method of determining a load-displacement complete curve of concrete I-II composite cracks, which belongs to the technical field of concrete fracture test. In the new test method, a right-angled broken line crack is cut in the midspan of the traditional three-point bending beam concrete specimen, an improved three-point bending beam concrete specimen is obtained, the crackhas the same lengths in a horizontal direction and a vertical direction, and the break point is subjected to arc treatment; the initial crack height ratio a / h is 0.2 to 0.5, and the value of the curvature pho of the arc has a range of 1 / a to 15 / a; and the test adopts three-point loading, load is applied to the midspan of the improved three-point bending beam concrete specimen by a test machine, apredetermined loading scheme is realized, and a load-displacement complete curve is obtained. The initial crack tip of the test piece has large KII / KI, the load-displacement complete curve can be tested under simple test operation, a numerical value simulation result can be verified accurately and effectively, and a certain reference value is provided for testing accuracy of the concrete I-II composite fracture analysis model and the numerical value analysis theory.

The invention relates to the field of microphones, in particular to a capacitor MEMS (Micro-Electro-Mechanical System) microphone diaphragm with sensitivity applied on electronic equipment. The capacitor MEMS microphone diaphragm comprises a diaphragm unit forming a capacitor system together with a backboard, wherein the diaphragm unit comprises an inner diaphragm piece suspended in a center position and an outer diaphragm piece, wherein the outer diaphragm piece comprises at least four pairs of uniformly distributed annular bending beams formed by outwards deviating and extending the edge of the inner diaphragm piece to reduce the restriction of an insulating layer to the edge part at the peripheral side of the diaphragm unit, thereby effectively improving the sensitivity. Meanwhile, the diaphragm unit can prevent plane torsion when the diaphragm unit shakes and effectively release the stress, thereby further improving the stability of the microphone property.

The invention discloses a method for evaluating a cooperative transformation of an asphalt pavement material and an optical fiber grating sensor, and relates to a method for evaluating the cooperative transformation of the pavement material and the optical fiber grating sensor. The method solves the problem that data acquired by optical fiber grating sensors embedded in the prior asphalt pavements cannot be directly used for evaluating the stress state of asphalt pavement structures. The method implants the sensor into three middle subsections of a beam specimen by utilizing the characteristics of simple stress of a four-point bending beam specimen, calculates to obtain the theoretical calculation strain according to the deflection and the geometric dimension of a beam based on the assumption of a small-deformation pure elastic beam, modifies acquired data of the implanted optical fiber grating sensor through the theoretical strain obtained by the calculation, provides an evidence for the processing of the acquired data of the optical fiber grating sensors embedded in the prior actual asphalt pavements, and provides an evidence for determining the real stress state of pavement structures, exploring a pavement damage mechanism, perfecting a pavement design theory and a mechanical model, and performing preventative maintenance on the pavement structures.

The invention discloses a white car body frame assembly. The white car body frame assembly comprises a car body frame body, a front end frame and two side wall frames, wherein the front end frame is fixed to the front side of the car body frame body; the two side wall frames are fixed onto the left and right side faces of the car body frame body respectively; the left and right ends of the front end frame are fixedly connected with the front ends of the two side wall frames respectively; the front end frame comprises two upper bending beam upright post reinforced plates; and the two upper bending beam upright post reinforced plates extend from top to bottom respectively to be fixed to the rear sides of corresponding car body upper bending beam upright posts. The white car body frame assembly disclosed by the invention solves the problem that the connection between the upper bending beam upright posts and front longitudinal beams is weak, front face column collision longitudinal beams do not collide, the front face column collision performance is improved, moreover, the rigidity of headlamp mounting points is increased, and the safety of passengers is improved.

The flat loop-shaped wire binding element is bent into a C-shape in a segment fashion. Bending is carried out using a device (90) with two bending units (95, 95), each with at least one retaining part (91, 91), at least one support (92, 92) and at least one bending beam (93, 93), the two bending units being individually movable along the wire loops in a controlled manner. Two O-shaped dies (94, 94) are used to bend the C-shapes into O-shapes, which are used to hold brochure sheets together.

The invention relates to a tree animation simulation method based on a simplification modal analytical method. According to the simulation method, modal analysis is carried out on independent leaves and leaf stalks but not on a whole tree, then a dynamical model of the broad leaves is combined, and a new dynamical model of the tree is set up through matrix transformation according to the hierarchical structure of the tree. The method comprises the specific steps: a dynamical model of a three-dimensional bending cantilever beam is set up, dynamical equations of the bending beam are respectively expressed as a time domain equation and a space domain equation by adopting a variable separation method, an air dynamical model is set up to determine the sum of the external force applied on branches, the dynamical model of the leaves is set up to solve the sum of the external force applied on blades, and a tree model and the dynamical model of the whole tree are set up. The tree animation simulation method can be used for developing three-dimensional tree animation simulation engines, serves as a support for development of virtual reality, game and three-dimensional animation core technologies, and has the important application prospect.

The invention discloses a forming mold for asphalt test pieces of a bent beam rheometer. The forming mold comprises a bottom plate, inner molds and side molds, wherein a semi-closed cavity formed among the bottom plate, each two adjacent inner molds and the side molds is a forming region of the asphalt test pieces. The inner molds and the side molds of the forming mold are convenient to assemble and disassemble, and cooled molded asphalt is easy to release from the mold. By the adoption of the mold, a mixture of glycerol and talcum powder as an isolating agent in specification is avoided, resources and time are saved, a plurality of test pieces can be formed at one time, the labor intensity is low, and the forming efficiency is greatly improved; moreover, after the test pieces are formed through the mold, the situation of attachment of asphalt to the mold is avoided, the mold does not need to be cleaned and is unlikely to be damaged, the dimension accuracy of the test pieces is ensured, and the service life of the mold is greatly prolonged.

The invention discloses a low temperature performance analysis method for rock asphalt-modified asphalt. The low temperature performance analysis method for the rock asphalt-modified asphalt specifically comprises the following steps: preparing the rock asphalt-modified asphalt; measuring the needle penetration of the prepared rock asphalt-modified asphalt, calculating an equivalent brittle point,and analyzing the low temperature performance of the rock asphalt-modified asphalt according to the equivalent brittle point; performing a ductility test on the rock asphalt-modified asphalt, calculating the breaking work and the compliance in extension according to a test result, and analyzing the low temperature performance of the rock asphalt-modified asphalt according to the breaking work andthe compliance in extension; performing a low temperature bending beam test to obtain the flexural creep stiffness of the rock asphalt-modified asphalt, calculating a comprehensive index according tothe flexural creep stiffness, and analyzing the low temperature performance of the rock asphalt-modified asphalt according to the flexural creep stiffness. By adopting the low temperature performanceanalysis method disclosed by the invention, the low temperature performance of the rock asphalt-modified asphalt can be reflected more scientifically, accurately and comprehensively; moreover, the method is simple and is wide in application range.

The invention provides a medical lifting type transfer mechanical arm and a transfer method thereof. The transfer mechanical arm comprises a base, a hollow bending stand column and an electric controlsystem, wherein the bending stand column is in an inverted L shape, the suspended end of the bending stand column is connected with a soft rope belt with the adjustable length, and the electric control system comprises a storage battery set, a control circuit, a direct current motor, a rising button and a falling button; the inner side wall of the bending stand column is provided with a soft ropebelt reel and a direct current motor, one end of the soft rope belt reel is connected with a worm wheel, the direct current motor is connected with a worm, the side wall of the bending stand column is provided with a hand wheel insertion hole, one end of the soft rope belt winds round the soft rope belt reel, and the other end of the soft rope belt is exposed from the bending stand column and isconnected with a transfer bed sheet structure; the transfer bed sheet structure comprises a bending beam and a transfer bed sheet, the bending beam is provided with a plurality of hooks, the two sidesof the transfer bed sheet are provided with a plurality of cloth pull rings, and the cloth pull rings are hung on the hooks to connect the transfer bed sheet and the bending beam. The medical liftingtype transfer mechanical arm and the transfer method thereof can solve the problem that a patient is transferred between a sickbed and a transfer bed in narrow space.

A splice plate for a faceted curved beam formed in the field from a straight beam. The splice plate can be used to fix the bends of either a convex or a concave curved beam used in the grid of a curved suspended drywall ceiling.

The invention discloses a general roof bend beam clamp used for the laser cutting technology, and belongs to the field of a general bend beam clamp device used for a rail vehicle roof bend beam laser cutting technology. The clamp comprises a bend beam outer side circular-arc curve face limiting mechanism, an end plate center support, two end plate side square supports, a plurality of transverse ejecting mechanisms, a bend beam supporting rail, a plurality of connecting plates and a base; the clamp can protect the roof bend beam outer side circular-arc curve face, and deformation of the curve face due to excessive extrusion is avoided; circular-arc limiting end faces parallel to the circular-arc curve face of the inner side wall of a circular-arc plate are arranged on two circular-arc curve face inner rib plates of the clamp and are specially used for carrying out matching and limiting on two ends of a circular-arc groove of a cap-shaped bend beam, and therefore positioning precision is improved; when the circular-arc curve face inner rib plates are not used, the circular-arc curve face inner rib plates can be detached, clamping of the roof bend beam cannot be disturbed and affected, and the application flexibility and generality of the clamp can be further expanded.

A large-span and special-shaped arch bridge, comprising a main girder (2), a center abutment (11) served as a central bearing point and two auxiliary abutments (12,13) served as bearing points at two ends, wherein further comprising an arch-axis combination (3) and two arch-axis bending beams (4,5) presented as arcs projected upwards, the arch-axis combination being built on the center abutment (11) with two ends connected to the inner ends of the two arch-axis bending beams (4,5), the outer ends of the two arch-axis bending beams (4,5) being built on the two auxiliary abutments (12,13), the two arch-axis bending beams (4,5) being connected to the main girder (2) via a plurality of inhaul cables. A method for constructing said arch bridge is also disclosed. Through the dual-arch axis of two arch-axis bending beams, the bending strength of the cross-section of the arch bridge is significantly increased, the bending moment of the cross-section of the arch at the central bearing point is decreased, the vertical displacement at the haunch of the arch is lesser, and the deformation of the main girder is reduced, thus the force of the entire bridge is more reasonable, the construction cost can effectively be reduced and the construction period can be shortened.

The invention relates to a frame of bend beam motorcycle and relative fitting mounting structure, wherein said fittings comprise a tail lamp, a tail cover and left and right side covers; the tail lamp via metal support is fixed on the frame which is arranged with a bar hole for adjusting the distance between the tail lamp and the frame; the mounting bolts are through the tail cover mounting hole, the left and right side cover mounting holes, and the bar hole to mount the tail lamp, the tail cover and the left and right side covers on the frame; the tail lamp via the metal support is mounted on the frame. The invention can reduce the mounting space between the tail lamp and the cover element.

A roof steel structure pairing device in a railway vehicle comprises a TC vehicle location frame body, an MC vehicle location frame body, an accompanying frame body, support legs, a support, bending beam location bodies and press blocks. The device is characterized in that the TC vehicle location frame body and the MC vehicle location frame body are both divided into two halves and disconnected from the middle to form a channel, and the accompanying frame body penetrates the channels. An original roof bending beam location device is divided into two halves and disconnected from the middle to form a channel, the surplus 10-meter-long site is utilized to remanufacture a set of roof bending beam location device which is also divided into two halves, a beam on the 20-meter-long accompanying frame penetrate the channels to achieve the effect that the 30-meter-long site can be provided with two sets of 20-meter-long tools, namely, a TC vehicle bending beam location device and the MC vehicle bending beam tool location device, the two sets are installed onsite, and the problem of frequent adjusting of two vehicle types is solved. The two sets of independent tool location bending beams are adopted, the tool stability is ensured, labor intensity of workers is reduced, factory utilization rate is improved, and production efficiency is greatly improved.

The invention relates to a vehicle frame with full load, wherein the whole vehicle, via front surround skeleton, back surround skeleton, left surround skeleton, right surround skeleton, top cover skeleton and bottom support, forms one integrated frame, to improve the fastness of frame. Via each node, upright post, longitudinal beam, incline support, horizontal bema, bended beam, or plates, the front and back of frame are through, the upper and lower are through, and the left and right are connected to form a closed force loop; therefore, the force can be distributed to everywhere of frame, to be functioned uniformly and avoid supporting on one point; and the structure is formed by rectangle steel tubes whose strength is 3-6 times of common vehicle with reduced weight. With said invention, the deformation of impacted vehicle is minimum to protect passengers.

The invention relates to a test method for measuring fracture energy of concrete based on a four-point bending beam. The test method comprises the steps of mounting a test device and a test piece, applying a load for testing, recording test data, calculating fracture energy and the like. The test method ensures that a stress state of the test piece is simply supported, and complete load-deflectioncurve can be obtained when an initial seam height ratio is greater than or equal to 0.4 according to a test result of an applicant, wherein an initial seam height ratio for measuring fracture energyby adopting a three-point bending beam test piece recommended by a Technical Committee on Fracture Mechanics of Concrete (TC-50FMC) of an International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM) is 0.5.

A toothed sprocket hub with elastic centering element comprising an input shaft having a receiving portion and a cylindrical outer surface, a sprocket engagable with the input shaft, the sprocket comprising at least two first surfaces each disposed on a bending beam such that each first surface is elastically moveable in a radial direction, the two first surfaces bearing upon the outer surface, the two first surfaces each having a radius d that is less than a radius D of the outer surface, at least one second surface that is radially moveable to a lesser extent than a first surface, the second surface engaging the receiving portion to prevent a relative rotation of the sprocket with the input shaft, and a third surface in cooperative relation to the second surface, the third surface bearing upon the outer surface of the input shaft, the third surface having a clearance fit with the outer surface.