63 results about "Stress functions" patented technology

The invention relates to a dental implant, comprising an implant part, an abutment part and a central positioning bolt, which is characterized in that a peripheral cylindrical spiral body of the implant part is divided into three sections of an implant shoulder part, an implant main body part and an implant cone part, a self-tapping slot is formed on the cone part, an inner hole which can be inserted in the abutment part to form the inner intubation sleeve type connection is formed therein; the inner hole is divided into the upper section of a conical part, the middle section of an implant inner hole deep part and the lower section of an implant inner thread with the diameter less than that of the middle section; the abutment part is a rotary body which is sequentially reverse conical, positive curved, positive conical and cylindrical from top to bottom at the periphery, the abutment part can be a solid body and can also be the rotating body with a through hole which can be equipped with the central positioning bolt at the center, and the periphery thereof is a circular table which is sequentially reverse conical, positive curved, positive conical and cylindrical. The dental implant of the invention has rapid implantation, great strength, tight positioning and early retention, which can prevent the rotation, transfer the scattered bite force and scatter the stress function of the central bolt.

The invention provides a bendable base shell. The base shell comprises a first semi-shell body, a second semi-shell housing and a bending part used for connecting the first semi-shell body and the second semi-shell body. The bending part comprises multiple connection plates whose long edges are successively attached to each other. The connection plates are successively connected through hinging pieces. Each hinging piece comprises a fixed plate, a fixed shaft vertically arranged on the surface of the fixed plate and a pin shaft. The fixed shafts are fixedly connected with the connection plates. The pin shafts are rotatably connected with adjacent connection plates. The beneficial effects are that when the base shell is bent, the connection plates allow the bending parts of a display panel to have uniform stress functions, so wrinkles at the bending parts of the display panel are prevented from affecting display effects.

A method of predicting distortion in a workpiece may include measuring residual stress induced in a coupon surface of a plate coupon by a selected manufacturing operation. The induced residual stress measurements may be fitted to a curve shape function. A moment coefficient may be calculated based upon the fitted induced residual stress measurements. The moment coefficient may be used to calibrate a stress function and corresponding stress magnitude. The calibrated stress function may be applied to a model of the workpiece such that the distortion of the workpiece may be predicted.

The invention provides a well cementation cement sheath integrity analysis and forecast method and device. The method comprises the steps that under a homogeneous crustal stress field, and based on the elastic thick wall cylinder theory and Mohr-Coulomb plastic yield guidelines respectively, the stress distribution and the displacement distribution of an elastic area of the well pitshaft and the stress distribution and the displacement distribution of the plasticity of the pitshaft area are calculated and obtained, the pitshaft area comprises a casing pipe, a cement ring and the surrounding rocks distributed from the inside to the outside; the stress distribution and the displacement distribution of the well pitshaft under the inhomogeneous stress field using the Airy stress function are calculated and obtained, the homogeneous stress field and inhomogeneous stress field are linearly overlaid and the result is the original stress field; the stress distribution and the displacement distribution of the pitshaft plastic area, and the stress distribution and displacement distribution of the pitshaft under the inhomogeneous stress field are utilized and linearly super-imposed to obtain the total stress distribution and displacement distribution in the pitshaft, which is used for the analysis and forecasting of cement sheath integrity. The well cementation cement sheath integrity analysis and forecast method and device take into account the cement sheath elastic plasticity, to reflect the work conditions of the real well bottom.

The invention discloses a high-accuracy conversion method for ground stress calculation result among different scale models. In the method, according to a finite element fundamental theory, a stress conversion calculation formula among different models is deduced, and high-accuracy conversion from a large-range stress inversion model stress calculation result to a fine calculation model is realized on the basis of the back calculation of a result data file. The method does not need to carry out regressive calculation of the initial stress of new grid points again due to the calculation of thechange of a calculation model, and a foundation is laid for subsequent calculation and research. The beneficial effects of the scheme can be obtained by narration for the above scheme, and calculationefficiency is improved. Compared with a traditional method that a mathematical statistics method is adopted to fit an initial stress function in an engineering area, the method is characterized in that calculation accuracy and reliability can be improve.

The invention discloses a glass guardrail double-layer inhaul cable supporting system pedestrian bridge structure. According to the structure, upper prestress inhaul cables (1), lower prestress inhaul cables (2), guardrail glass panels (3) and bridge floor glass boards (4) are combined, shearing force is transmitted through the guardrail glass panels (3), and a new pedestrian bridge supporting system is composed of the guardrail glass panels (3) and the prestress inhaul cables and is reasonable in stress, light and attractive. The guardrail glass panels (3) are fixed between the upper prestress inhaul cables (1) and the lower prestress inhaul cables (2) through prefabricated joint fasteners (5), and the guardrail glass panels (3) can serve as pedestrian bridge guardrails and meanwhile serve as structural stressed components to transmit the shearing force. The bridge floor glass boards (4) are connected with the lower portions (3) of the guardrail glass panels (3) on the two sides through L-shaped connecting pieces (6). The novel structure integrates permeability, ornamental value and a stress function and has wide application prospects in construction of an urban street-crossing pedestrian bridge.

The invention discloses a large deformation flexible body dynamic stress measurement information conversion method based on neural networks, and belongs to the field of parachute measurement technologies and computer machine learning. The method is applied to the stress measurement in the movement process of a large deformation flexible body and especially applied to the stress measurement information conversion in the inflation process of parachutes, hovercrafts and the like. The method mainly includes the following steps of firstly, conducting voltage-stress calibration; secondly, filtering calibration data; thirdly, establishing a voltage-stress function; fourthly, obtaining voltage data under the actual environment and conducting filtering; fifthly, establishing the large deformation flexible body dynamic measurement data conversion neural network; sixthly, using the data training neural network under the actual environment; seventhly, obtaining and outputting stress information obtained through conversion. The voltage-stress information conversion is conducted through the neural networks, the calculation complexity is low, the conversion accuracy is high, and the method can be effectively applied to the dynamic stress measurement information conversion of the large deformation flexible body.

The invention relates to a structure and a method of using step electrodes to realize nanometer beam drive and pressure resistance detection, which are characterized in that a metal electrode on the upper part of the nanometer beam is of step-shape; the clearance between the two ends of the electrode and the nanometer beam is smaller than 100 nanometers; while the electrode clearance in the middlepart is between 1 and 2 microns. An MIS capacitor structure is formed between the two ends of the step electrode and the nanometer beam. When the voltage between the step electrode and the nanometerbeam exceeds the threshold voltage of the MIS capacitor, a space charge area below the MIS capacitor achieves the maximum value; and the resistance under the space charge area is only a stress function, which can be used for detecting the pressure resistance of the nanometer beam. The central part of the step electrode has small effect on the resistance value of the nanometer beam due to the largeclearance; the drive efficiency of the central part to the nanometer beam is high; and the central part is used for realizing static drive on the nanometer beam.

The invention relates to a method for evaluating reliability of a straight gear transmission system. According to the method, the numbers of teeth of all gears, the static strength probability density functions of all the gears and the stress functions of all the pairs of meshing gears in the straight gear transmission system are acquired, the load spectrum of loads borne by the straight gear transmission system is obtained, and the probability density function of the stress amplitude of the load courses is obtained according to the load spectrum of the loads borne by the straight gear transmission system; the straight gear transmission system bearing the loads successively along with time evolution serves as a series system, namely, a time-domain series system in four-dimensional space-time, the reliability of all the pairs of meshing teeth is expanded to the reliability of the meshing gears, a reliability model of the meshing gears of the straight gear transmission system under the different load courses is established through a statistical averaging method, the reliability of all the pairs of meshing gears of the straight gear transmission system is calculated through the reliability model of the meshing gears of the straight gear transmission system under the different load courses according to the obtained load spectrum of the loads borne by the straight gear transmission system, and then the reliability of the straight gear transmission system is evaluated.

The invention discloses a stress-dependent coarse-grained soil seepage deformation characteristic tester and a test method, and belongs to the field of rock-soil body seepage deformation parameter test. The stress-dependent coarse-grained soil seepage deformation characteristic tester aims to solve the technical problem that the change rule of a coarse-grained soil seepage deformation hydraulic slope and the measurement of a seepage coefficient after seepage deformation is carried out under the function of different stresses are investigated, wherein applied pressure is controlled through the air pressure of a pressure chamber, and the quick saturation of the coarse-grained soil can be achieved by an air extractor through the injection of air-free water. In a test process, the hydraulic slopes under different stress functions are obtained through a specific value of the reading difference of two piezometer tubes and the distance, and the change rule of the hydraulic slope along with stress change is analyzed. Flow changes in a testing process are recorded to obtain the seepage coefficient after the seepage deformation is carried out. The device has the advantages of simple and reasonable structure and convenience in operation and is mainly used for fields including civil engineering, water conservancy engineering and the like.

The invention provides a material point method-based stochastic dynamics analysis method applied to explosion shock engineering. The method comprises the steps of building an engineering physical model; determining stochastic variables and performing discretization; dividing a background grid for a calculation domain; calculating a node load of the background grid, solving a momentum equation, andcalculating first-order and second-order partial derivatives of an accelerated speed of a grid node and an accelerated speed of a material point to basic stochastic variables; updating the position and speed of the material point and first-order and second-order partial derivatives of the position and speed of the material point to the basic stochastic variables; calculating a strain increment and a spin rate increment of the material point; calculating the density of the material point; according to a constitutive model, updating a stress of the material point and first-order and second-order partial derivatives of a stress function to the basic stochastic variables; according to a state equation model, updating a pressure and first-order and second-order partial derivatives of a pressure function to the basic stochastic variables; and calculating a structure stochastic response result. The defects of a conventional numerical calculation method in researching nonlinear problems of explosion, impact and the like are overcome.

The invention relates to a method for preparing niobium magnesium acid lead-lead titanate single crystal longitudinal-vibration energy exchanger. Wherein, it comprises: using Ansys software to design front radiator, tail load and piezoelectric crystal pile, to be assembled; using table clamper to position the front radiator; functioning -12.0MPa prestress on the tail load; welding the positive copper electrodes via one wire, as the anode of energy exchanger; welding the passive copper electrodes via one wire as the cathode; putting it into low-temperature oven at 30-60Deg. C to be solidified for 20-72 hours; sealing and vulcanizing. The invention has low working temperature, simple stress function, to express the high electromechanical couple property of PMNT single crystal material, to control the receiving sensitivity of longitudinal vibration energy exchanger.

The embodiment of the invention discloses a residual stress prediction method, a residual stress prediction device, a server and a storage medium. The method comprises the following steps: constructing a stress function; symmetrically extending the stress function to construct a periodic function; expanding the periodic function by using a group of preset-order trigonometric series; respectively calculating a first deformation profile of the cutting surface by taking each order of trigonometric series as a residual stress value; fitting the first deformation profile with a second deformation profile obtained by experimental measurement to determine a coefficient corresponding to each triangular series; confirming the expression of the stress function according to the coefficient corresponding to each order of trigonometric series; and calculating by taking the distance between the point to be measured and the notch end of the test part as the input value of the stress function so as topredict the residual stress of the point to be measured. According to the technical scheme provided by the embodiment of the invention, the problem of inaccurate profile data obtained by measurementis solved. The batch calculation can be realized for residual stress distribution of test parts with the same geometrical shape.

The invention discloses a member residual stress field prediction method based on limited test points. The method comprises the following steps: 1, carrying out structural discretization; 2, classifying unit nodes, establishing a displacement shape function matrix and a unit stress function matrix, and then solving a unit matrix; 3, according to the unit matrix, establishing a stress shape particle residual stress vector array and an integral node load array, and solving an integral matrix; 4, according to the rank of the integral matrix, determining the number, distribution and testing of experiment test points; 5, according to a tested residual stress experiment result as a residual stress boundary condition, solving all stress shape particle residual stress; and 6, according to the stress shape particle residual stress and the unit stress function matrix, solving non-stress shape particle residual stress so as to obtain a residual stress field of a member. According to the invention, the residual stress of the member can be accurately predicted without restrictions of the material and the structural shape of the member, and the method has obvious advantages especially in a manufacturing process of an unknown member and residual stress prediction of a complex member.

The distribution of chemical compounds in high-dimensional molecular descriptor space can be viewed in two dimensions by applying the projection method of this invention. This method has particular usefulness for viewing the relationships of a large number of compounds such as found in a large scale HTS or virtual combinatorial library. After selecting a representative subset of the larger data set of compounds, initially components from the high-dimensional descriptor space are determined by PCA. In order to relax an NLM projection using the PCA components as a start, the stress function is modified to reflect a local horizon beyound which the separation of the compounds is not meaningfully measureable. The resulting two dimensional projections provide a clear insight into the distribution of the chemical compounds in the higher dimensional space. The method is clearly generalizable to viewing descriptor space in three dimensions and to using high dimensional descriptors other than those used to describe molecular structure.

The invention provides a rolling stock axle interference assembly contact stress analysis method based on simulation. The method includes taking a CRH2-type high-speed train trailer wheels as prototypes, and creating a three-dimensional digital model for axle interference assembly by SolidWorks software; converting the three-dimensional digital model for axle interference assembly into a SolidWorks finite element analysis module simulation, and creating a finite element model; setting the contacting mode of a contact surface group of wheel set-wheel axle interference assembly to be shrink fit,and performing interference contact stress analysis; selecting a plurality of different axle interference values within a specific range in an equal difference mode to perform analysis. The rolling stock axle interference assembly contact stress analysis method has the advantages that yield strength limits of axle materials are compared on the basis of multiple finite element analysis data, reasonableness and reliability of the interference range are judged and illustrated, and an interference-stress function model for axle interference assembly is determined.

The invention belongs to the field of biological medicine and particularly relates to an application of a FoxO1 gene in drug preparation. According to the invention, the function of the FoxO1 gene in osteoblast proliferation differentiation under high sugar condition is researched so as to research the function of the FoxO1 gene in bone injury and osteoporosis induced by diabetes, in order to provide theoretical basis and experimental data for clinical treatment of diabetic bone injury and osteoporosis disease. The invention verifies that the FoxO1 gene can promote osteoblast proliferation, FoxO1 is used as a factor used for mainly regulating and controlling bone mass and has an antioxidant stress function on osteoblast, the FoxO1 gene generates a certain protection function on osteoporosis no matter in environment with increased oxidative stress level caused by ageing or diabetes or high blood sugar, and provides a new target for research and development of new anti-osteoporosis drugs.

An application program and method for determining the strength of electronic products exposed to mechanical shock, including application program steps of (i) describing the mechanical configuration of the electronic product; (ii) describing the stock response; (iii) calculating natural response modes of the circuit card; (iv) calculating stress functions for each component, each response mode; (v) using stress functions to determine modal component stresses at peak response; (vi) removing computer calculation error by comparing the stresses for all components to expectations; (vii) expectations numerically defined by performing equivalent analyses on test experience.

The invention provides a discrimination method of the stability potential energy of an overburden strata in metal mine supported by artificial pillars. A goaf overburden strata model is established, when the width of a goaf is larger than the length, the model is simplified to a thin section simply supported beam model, and stress distributions generated by the support force and tectonic stress ofa beam are calculated respectively; when the strata only supported by the beam, a plane-coordinate system is built, the stress function on a plane is calculated, and components of stress are obtained; when the strata is only subjected to the tectonic stress, the components of stress are calculated; when the strata is subjected to the combined action of the supporting force and the tectonic stress, the generated total stress distribution is calculated when the strata is subjected to the combined action of the supporting force and the tectonic stress, the potential energy of the whole strata is calculated, and the stability potential energy of the overburden strata in metal mine supported by artificial pillars is discriminated. The method can be used for analyzing the stress distribution and concentration degree, changing by the artificial pillars, of the goaf overburden strata, and meanwhile the stability of the goaf overburden strata is judged under supporting of the artificial pillars.

The invention provides a compound preparation with anti-hypoxia stress function, which is mainly used for preventing and treating various pathological or physiological states caused by hypoxic injuries and belongs to the field of medicine. The compound preparation with anti-hypoxia stress function is an oral preparation prepared from valerian extract, luteolin, camomile flower extract, conjugated linoleic acid and ginseng extract used as active pharmaceutical ingredients by using pharmaceutically conventional adjuvants and technique. The animal experiment indicates the anti-hypoxia compound preparation has favorable hypoxia resistance, and can effectively improve various hypoxic pathological states caused by lower oxygen content in the external environment. After the preparation is used by nearly 300 people, including soldiers rushing into the plateau, in-plateau troops and tourists and working personnel entering the plateau, the field experiment data indicates that the compound preparation can effectively the mental work capacity and physical endurance of the human body in a hypoxia environment.

The invention discloses a formation pressure correction method based on curvature. The method comprises the following steps: 1, a formation pressure 3D data volume P is acquired; 2, in view of a seismic interpretation horizon in the same range as the 3D data volume P, curvature attributes are extracted, and the curvature attributes are normalized as a contribution rate a of an extrusion structureto the formation pressure; 3, based on formation data, an extrusion structure stress function sigmaT is fit; and 4, a formation pressure 3D data volume PM after correction is calculated according to the following formula: PM=P+a.sigmaT. The curvature attributes are introduced during the formation pressure correction process, the contribution of the extrusion structure to the formation pressure canbe effectively reflected in the space, and a more accurate formation pressure prediction result can be acquired.

The invention relates to a vaginal mold for vaginal reconstruction comprising a collapsible and expandable dome assembly (1) and a lower support assembly (2) snapped to the dome assembly (1). The vaginal mold prevents the vaginal mold from contacting the vaginal tip when the mold is squeezed into the vagina so that the mold is in close contact with the vaginal tip, The vaginal top skin graft receives the biggest stress function, causes the vaginal top skin graft to be too thin, produces the rupture, the inflammation and so on question as well as the vaginal top skin graft closely joins with the vaginal mold top surface, produces the skin graft and the mold top adhesion, causes the skin graft the peeling off question again when takes out the mold.

The invention discloses a thermal stress crack initiation method of a surface annular groove root of bar blanking. Before crack initiation, an annular groove is prefabricated in the surface of a metal bar, a deep cooling device is rapidly charged with liquid nitrogen, and the temperature in the deep cooling device is kept between -196 DEG C and -130 DEG C. Then, the metal bar is fed into the deep cooling device to be subjected to segmented rapid deep cooling. At the moment the cooling starts, due to the fact that the surface temperature is lower than the core temperature, the surface of the metal bar is sharply cooled and shrunk, large stress concentration is generated at the bottom of the annular groove under the instant tensile stress and the notch effect, and a microcrack cluster is produced. After crack initiation is ended, the metal bar is fed into a blanking machine to be subjected to segmented blanking. The notch effect and the thermal stress function are utilized, dynamic cracks generated in the later blanking process can enter the expanding stage more rapidly, and the overall blanking efficiency is improved.

The invention is applied to the technical field of optics, and provides a method and apparatus for detecting a relation between an evanescent field and Goos-Hanchen displacement, and an optical device. The method comprises the following steps: according to physical meanings of a stress function and a potential field function of light in the evanescent field, obtaining a potential field function of the evanescent field for total-reflection light; through combination with the potential field function of the evanescent field for the total-reflection light, obtaining a wave function of the total-reflection light after perturbation through a Schrodinger equation; and comparing the wave function of the total-reflection light after the perturbation with a wave function of free total-reflection light without an evanescent field effect, and the total-reflection light obtaining momentum having the same momentum property as the evanescent field under the effect of the evanescent field. According to the invention, better regulation and control of the Goos-Hanchen displacement can be realized, and the Goos-Hanchen displacement can be better applied to such fields as optical sensors, all-optical switches, light beam displacement modulators and the like.