1784 results about "Internal forces" patented technology

A system for percutaneous fixation and stabilization of a fracture with a spanning, expandable structural frame placed in the intramedullary canal of the bone, comprising a column of surgical fluid such as bone cement, within which the structural frame acts as a reinforcing cage, and a sheath positioned at the fracture site and at least partially surrounding the frame and fluid. The fluid may be supported by a restrictor and may be agitated with a vibrating probe to remove entrapped air. The structural frame may be self-expanding or opened by an internal force, and it may be retrievable. The frame, fluid, or sheath may contain antibiotics, pharmaceuticals, or other therapeutic compounds to be delivered to the fracture site.

A stent delivery system comprising a guide having a retention member configured to exert either an internal force or an external force on the stent to assist in retaining the stent on the guide.

Embodiments of the present invention provide methods and apparatus wherein physics models are integrated with motion capture animation to allow for variability in animations, dynamic response, such as animating events different from those for which motion capture data was obtained, including changes in character purpose and collisions. The physical model may include sets of internal forces and/or external forces. To facilitate the integration of mo-cap animation data with physics models, mo-cap animation data is played back using forces on physical models rather than directly setting joint angles or positions in a graphical skeleton, which allows the animation to be dynamically altered in real-time in a physically realistic manner by external forces and impulses.

A seismic energy dissipation system for use with structures such as buildings, bridges and the like. The system includes a gravity frame, at least one reaction frame, and connection apparatus for connecting the gravity frame and the reaction frame. The connection apparatus includes springs for setting a period of response and energy dissipation units for dissipating energy within the structure, thus controlling the response of a structure with respect to internal forces, accelerations and deformations due to external excitations such as wind or earthquake.

The invention provides a finite element analysis method for the temperature action on a prestressed reinforced concrete continuous rigid frame bridge. The finite element analysis method is used for analyzing and calculating the stress and displacement distribution in the construction and finished bridge stage under different temperature gradient models, and provides references for designing and optimizing the prestressed reinforced concrete continuous rigid frame bridge. Through calculational analysis based on finite elements and the structural mechanics, the forward-calculation method is adopted for structural distortion and stress analysis according to the actual construction loading sequence of the bridge structure, so that the complex mechanics problem of box girder temperature self-stress, temperature secondary internal force in a prestressed reinforced concrete statically indeterminate structure and secondary stress of the temperature secondary internal force is solved easily, conveniently and efficiently, and the finite element analysis method has important practical value.

The invention belongs to the building support component technology field including the stress automatic control and monitoring as well as the structural safety, and relates to a steel tube supporting internal force automatic compensating and displacement controlling system. The system comprises an upper system, a PLC control system module and a field executive system. A steel support is arranged on a reinforced concrete diaphragm wall, a hydraulic jack is arranged on the steel support, and real time pressure monitoring values are fed back through a pressure sensor. The steel support and the hydraulic jack form a pre-stressed steel support structure, the hydraulic jack is connected with a hydraulic pump station through an oil circuit, and is connected with the PLC control system module through the pressure sensor, the hydraulic pump station is connected with the PLC control system module, and a PLC controlling device is connected with the upper system. Through auto-control software and a PLC control system, the automatic control to the axial force of the steel support is realized, thereby controlling the displacement and the settlement of the deep excavation supporting structure and the adjacent basic facilities.

The invention discloses a real-time bridge load identification method based on an influence matrix. The method includes: according to bridge monitoring aims and precision requirements, setting displacement, angle and strain sensors on a bridge; according to bridge structural form and load features, equaling bridge load into a feature load combination; establishing a finite element analysis model for the bridge, and separately calculating measured values of each sensor caused by each unit feature load; combining the measured values of the sensors caused by the unit feature loads into the influence matrix; according to the measured values of the sensors, calculating the magnitude of the feature load, as current actual load of the bridge; and calculating deformation and stress mechanical parameters of a concerned position of the bridge, and evaluating safety state of the bridge according to the mechanical parameters. The method is applicable to various types of identifiable or equivalent basic loads and various type of measurement information, including absolute or relative displacement, absolute or relative angle, strain, internal force, external force and the like.

The invention discloses a tunnel construction informatization dynamic monitoring system and a monitoring method thereof. The system comprises an industrial personal computer, a PLC (programmable logic controller) wireless controller, a high-configuration digital camera, a deformation monitoring sensitization part, digital display acquisition equipment, wireless transmission equipment and a dynamic design feedback device. The method includes: 1), controlling commands to be transmitted to the PLC wireless controller by a computer control main station and controlling the digital camera and the digital display acquisition equipment; 2), acquiring internal force monitoring data by the aid of the digital display acquisition equipment; and acquiring a deformation monitoring image via the deformation monitoring sensitization part by the digital camera; 3), transmitting a monitored value to the computer control main station by the aid of the wireless transmission equipment; 4), analyzing results by the computer control main station via a real-time analysis module; and 5), transmitting the analyzed results to the dynamic design feedback device, analyzing relative difference of the really monitored value and a standard value, and early warming in real time by an early warning module. The tunnel construction informatization dynamic monitoring system is scientific, safe and practical, the method is convenient, instant, fast and effective, and safety problems in construction monitoring of tunnels are avoided.

The invention discloses a design method for longitudinal pre-stressing tendons of a variable-cross-section pre-stressed concrete continuous bridge. The optimization design method for the longitudinal pre-stressing tendons of the pre-stressed concrete continuous bridge is built based on the design principle of the pre-stressed degree and through combining an analytic method with a finite element method and compressively considering dead load and live load action effects. A three moment equation of the variable-cross-section pre-stressed concrete continuous box girder bridge is established to solve the internal force of the structure under the action of the self weight on the basis of the average bending moment method. A calculation formula of pre-stressed effective pre-pressure is built through a load equal effect method and a unit load method; a creep effect calculation formula is built through a force method; the temperature effect and the automobile load effect are calculated through the finite element method; and a variable-cross-section statically indeterminate structure pre-stressing tendon reinforcement calculation formula is obtained through combination of the stress ratio with the definition of the competitive pre-stressed degree.

The invention discloses a widening and reinforcing structure for a concrete box girder bridge and a method for constructing the same. The widening and reinforcing structure comprises a new box girder I and a new box girder II which are parallel with the original box girder bridge and are positioned at two sides of the original box girder bridge; and the box girder of the new box girder I and the box girder of the new box girder II are in rigid connection with box girder flanges of the original box girder bridge. The new box girders share part of the load of the original box girder so that the internal force and the deformation (or the stress of a control point) of a controlled cross section of the original box girder bridge are reduced by about 20 percent; and the generation and the development of cracks on a crest slab, a bottom plate and a web plate of the original box girder bridge can be effectively inhibited. The widening and reinforcing structure is simple, has slight damage to the original box girder bridge, and does not increase obvious structure deadweight substantially. The method for widening and reinforcing constructions is simple and convenient; the reinforced concrete box girder bridge has a reliable structure; the construction period is relatively short; the impact on the road traffic is relatively small; and the damage to the natural environment and the bad social impact caused by the demolition of an old bridge are avoided, thus the method has good comprehensive technical, economic and social benefits.

A comprehensive monitoring system for a side slope and a landslip is capable of comprehensively monitoring surface displacement and depth displacement of a slope body, soil pressure of a retaining structure, and internal force of an anchoring structure, and realizing high-efficient acquisition and automation treatment of data. The comprehensive monitoring system for the side slope and the landslip comprises a side slope surface displacement monitoring unit, a side slope supporting structure stress monitoring unit, a side slope interior deformation monitoring unit and a data acquisition and transmission device, wherein the side slope surface displacement monitoring unit is arranged on a side slope surface and adopts a stay cord type fiber bragg grating displacement sensor; and two ends of the side slope surface displacement monitoring unit are respectively fixed on the side slope surface and the top of a slope body retaining structure; the side slope supporting structure stress monitoring unit consists of fiber bragg grating pressure boxes vertically embedded on the back of the slope body retaining structure at intervals, and a fiber bragg grating force gauge arranged on a slope body anchoring component; the side slope interior deformation monitoring unit is a fiber bragg grating intelligent anchoring rod embedded in the slope body by drilling a hole; and the data acquisition and transmission device consists of a multi-channel wavelength demodulator and a monitoring computer.

The invention discloses a pin tool used for friction stir welding, which integrates an electromagnetic vibration system, an electromagnetic action system, an internal forced cooling system, a gas-shielded forced cooling system, a temperature induction system and a sealing and insulation system, and is an integrated pin tool used for friction stir welding, which has the functions of electromagnetic vibration in-situ composite electromagnetic action, forced temperature control, gas shielding and temperature detection, and a device thereof is further disclosed, and can be applied in electromagnetic vibration in-situ composite electromagnetic action friction stir welding and the preparation of ultrafine grain materials with large thickness and large area by severe plastic deformation.

Interactive system provides training and assessments relating to joint stabilization capabilities and reaction-based performance for diverse populations. This system may enhance the subject's ability to generate and deliver power as a direct byproduct of properly timed decelerations originating with the effectors and supported by the verticality of the spine. Said decelerations also provide functional means for improving joint stabilization capabilities via improved co-contraction of the shoulder(s) joints and other anatomical locations on the subject. The resulting data may serve as the basis for predictive analytics relating to joint stabilization and the associated risk of orthopedic injuries. This system may also train/improve the dampening of internal forces resulting from aggressive weight bearing movements, and more effectively dissipate the force of received physical impacts.

The invention discloses a tunnel structure monitoring system and a tunnel structure monitoring method based on a distributed long-gauge fiber bragg grating. The system comprises distributed long-gauge fiber bragg grating sensors which are comprehensively distributed in a monitored range along the axial direction and the cross section of a tunnel; and longitudinal sedimentation of the tunnel and change conditions of various ring joints of the shield tunnel are monitored. The method comprises the following steps of arranging the distributed long-gauge fiber bragg grating sensors; and acquiring, transmitting and processing data. By the tunnel structure monitoring system and the tunnel structure monitoring method based on the distributed long-gauge fiber bragg grating, full-life monitoring on a tunnel structure in a construction period and a running period can be carried out, and longitudinal sedimentation, convergence deformation, joint deformation, duct piece internal force, strain and the like of the tunnel structure are dynamically monitored in real time.

An operator and related method for adjusting an internal force setting for a motorized garage door operator is disclosed. The operator checks for the presence of a secondary entrapment safety feature and automatically increases a force threshold setting from a first value to a second value if the secondary entrapment safety feature is detected. If the safety feature is not detected or it is later disconnected, then the operator automatically sets the force threshold to a more sensitive value.

The invention discloses a section-variable metal lattice structure and a machining method thereof. The section-variable metal lattice structure comprises a plurality of section-variable lattice units arranged in the space. Each section-variable lattice unit is formed by connecting a plurality of section-variable rod pieces. The section-variable metal lattice structure is formed by conducting sintering layer by layer through a laser melting technology. A working bin of a metal powder sintering machine is kept sealed before machining with nitrogen being protection gas. For the internal force characteristics of all parts of the rod pieces, the rod pieces of the metal lattice units are optimized. Compared with an even lattice structure formed by weaving and welding metal wires, the section diameter of the section-variable rod pieces in the section-variable lattice structure is accurately determined by the internal force condition needing to be met under the load condition, materials forming the section-variable rod pieces are increased or decreased according to the stress gradient in the section-variable rod pieces, powder materials are saved, and the light characteristic is improved.

An underpin method of building beam column, which is added with a strain instrument and a computer control device in the beam column underpin construction. The computer control device is connected to the strain gauge affixed on the support structure and surface of displaced structure or component, when adopting mechanical jack pair structure or component to exert jack lift force value in the unloading process, the strain of structure is transported to the computer control system by the strain gauge, which can exactly response to the internal force of the underpinned structure, deformation of structure, residual deformation of structure, internal force of the supporting structure and so on, thereby the operator can know actual stressed state of the structure and adopt the dial gauge to monitor structure displacement to provide reliable reference for loading, at last achieving purpose of structure unloading and ensuring safety of the operator and structure in the beam column underpin construction.

The invention belongs to the technical field of pile foundation quality detection in civil engineering, in particular to a method for measuring pile shaft internal force and cross section displacementin vertical dead-load test of a foundation pile. In the method, firstly, a casing is embedded on a pile shaft lengthways or holes are directly drilled on the pile shaft lengthways; a measuring systemis arranged in the casing or the drilling hole and is composed of an anchor head, a multiple position extensometer, an extension bar and a pressure pipe, wherein, the pressure pipe pressurizes to expand the anchor head so as to ensure that the anchor head is fixed in the casing or the drilling hole; after the anchor head is fixed, the multiple position extensometer measures vertical deformation between two adjacent anchor heads by the extension bar; according to a vertical displacement observation result and vertical deformation between two adjacent anchor heads, the layering frictional resistance of each soil layer, pile end supporting force and the vertical displacement of anchor head embedding cross section are calculated, and the relation of pile soil relative displacement and pile side frictional resistance is built so as to realize pile shaft internal force and cross section vertical displacement measurement. The invention has high test accuracy and favorable reliability, can replace traditional method using strain or string-wire sensors and displacement rods to measure pile shaft internal force and cross section vertical displacement.

The invention relates to an assembled reinforced-concrete framework beam-column joint adopting cover plate connection. The joint comprises a corbel of a precast column and a precast beam, wherein the end face of the corbel and the end face of the precast beam are respectively provided with a concave groove and a convex block which are matched with each other and are used for carrying out embedded fixing, steel plates are pre-buried in facades of the two sides of the connection part between the corbel and the precast beam, and steel cover plates are arranged at the outer sides of the steel plates pre-buried in facades of the two sides of the corbel and the precast beam and are fixedly welded to the steel plates pre-buried in the facades of the two sides of the corbel and the precast beam after the corbel and the precast beam are fixed in an embedding manner. A corresponding construction method comprises the steps of precasting, mounting and filling mortar in gaps. The joint and the corresponding construction method have the advantages that the strength of an assembled segment is enabled not to become a weak link of a structure under the action of a load, and the assembled segment has adequate earthquake resistance; the assembled segment is enabled to smoothly carry out internal force transmission and exert a connecting function; and the on-site assembling time is minimized, and the construction process is simple, convenient, fast and safe.

The invention discloses a structural design method for a load-bearing section of a miniature anti-slip compound pile. The method comprises the following steps: 1, performing a field geological survey, and determining mechanical properties of a geotechnical slope body through tests; 2, evaluating the stability of a slope, and calculating the residual slide thrust of the slope; 3, considering the adjustment and the distribution of the slide force among piles of the miniature anti-slip compound pile, and determining the distribution ratio of the slide force under each pile; 4, calculating to obtain the residual slide thrust borne by each pile; 5, calculating the bending moment, the shearing force, corners and the displacement of the load-bearing section of each pile; 6, performing reinforcement design on the miniature anti-slip pile according to the calculated bending moment; and 7, rechecking designed reinforcing bars according to the calculated shearing force. According to the design method, the residual slope slide thrust distribution conditions of each pile of the miniature anti-slip compound pile are determined, the reinforcing function of each pile body in the combined pile consisting of multiple piles is determined, the distribution of the anti-slip effect on each pile is obtained, the structure effect and the pile-soil action effect of the miniature anti-slip compound pile are considered, and the internal force calculation result is accurate and scientific, so that the bending resistance, the shearing resistance and the safety of the miniature anti-slip compound pile are guaranteed.

The invention discloses a suspension rod force and main cable shape combined calculation method for a suspension bridge. The method comprises the following steps of (1) establishing a coordinate system by taking a mid-span left tangent point and suspension points of the suspension bridge as coordinate origins, and representing catenaries of main cable sections; (2) supposing a group of suspensionrod forces, namely endowing each suspension force with an initial value; (3) calculating a completed bridge cable shape and an internal force of a mid-span main cable by utilizing an analysis method;(4) according to the numerical values calculated in the step (3), building a suspension bridge finite element model, calculating the suspension rod force, checking an error between a value of the suspension rod force and an assumed value of the suspension rod force by using a Euclidean norm, and if the error exceeds a limit value, returning to the step (2) together with the newly calculated suspension rod force, otherwise, obtaining the mid-span main cable shape and the accurate suspension rod force of the suspension bridge; and (5) calculating a side-span main cable shape by utilizing a horizontal component of the internal force of the mid-span main cable as an existing condition. According to the method, the accurate suspension rod force and the corresponding completed bridge main cableshape of the suspension bridge can be obtained, wherein the completed bridge main cable shape comprises accurate position of the tangent point.

The invention discloses a method for forecasting the displacement of surrounding rocks of a tunnel by utilizing a neural network, which comprises the following steps: an appropriate neural network model is selected, a training sample of the displacement data of the surrounding rocks is input, training is carried out to the neural network , the neural network model with the precision which meets the requirements is obtained, the forecast of the displacement of the surrounding rocks is further carried out by utilizing the trained neural network, the neural network calculates and outputs the forecasted displacement of the surrounding rocks within the following 3 to 5 days of the construction time according to the input measuring point input vector, thereby realizing pre-warning of the displacement of the surrounding rocks. The method utilizes the credible monitoring data in the actual construction, considers the geological features and the related influencing factors of the construction region and carries out the forecast of the deformation and the internal force, etc., of the rocks in the next stage by the feedback analysis of the neural network, thereby guiding the construction, optimizing the construction parameters and reasonably arranging the working procedure.

The invention provides a fiber bragg grating sensor network based large-scale structure body deformation measurement method which aims to detect the condition of deformation of a large-scale structure body which is stressed by an external force or an internal force and real-timely monitors health conditions of the large-scale structure body. The fiber bragg grating sensor network based large-scale structure body deformation measurement method includes arranging a fiber bragg grating sensor network on a structure body to be detected, using a fiber bragg grating strain sensor to detect strain borne by the structure body, using a fiber bragg grating temperature sensor as temperature compensation of the strain sensor, interpolating detected disperse strain data into polynomials, performing twice integration, and bringing in initial conditions to obtain a deformation curve of the structure body. The fiber bragg grating sensor network based large-scale structure body deformation measurement method is mainly used for monitoring health conditions of the large-scale structure body and is suitable for large-scale networking; compared with traditional resistance strain gages for measuring strain of the structure body, the fiber bragg grating sensor network based large-scale structure body deformation measurement method has the advantages that defects that resistance strain gages are difficult to network and prone to be interfered by electromagnets and many shield cables are heavy are overcome.