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46results about How to "Easy to program and calculate" patented technology
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Quantum-behaved particle swarm optimization (QPSO) recurrent predictor neural network (RPNN) method for financial time series prediction
InactiveCN107194460AIncrease diversityFast convergenceFinanceChaos modelsOptimal weightTheoretical computer science
The invention discloses a quantum-behaved particle swarm optimization (QPSO) recurrent predictor neural network (RPNN) method for financial time series prediction, which relates to analysis and prediction on a time sequence. Chaos and phase space reconstruction theories are firstly applied, through a saturation correlation dimension (G-P) method, a chaotic financial time series attractor dimension is calculated, and the structure of the RPNN is determined; then, the RPNN is trained by the QPSO algorithm; and finally, the dynamic optimal weight and the threshold of the network are determined, and thus, the simulation prediction value of the RPNN and the actual value can reach the minimum error precision. The problem that optimization of the RPNN based on a gradient algorithm is easy to fall into local minimum can be solved, and the built QPSO-RPNN optimization prediction method can be widely applied in financial investment and social economy, and has the advantages that the convergence rate is quick, the searching is global, the programming is simple and efficient, and the prediction precision is high.
Owner:XIAMEN UNIV
Combined loaded pile bearing capacity transfer matrix general solution method
ActiveCN106650131ATroubleshoot load bearing issuesEasy to program and calculateGeometric CADCAD numerical modellingTransfer matrixMatrix method
Owner:CEEC JIANGSU ELECTRIC POWER DESIGN INST
Method for computing infrared radiation and reflection radiation heat flows on surface of lunar orbit spacecraft
InactiveCN105740594ASolve the low calculation accuracyImprove calculation accuracySpecial data processing applicationsEngineeringMechanical engineering
The invention provides a high-precision method for computing infrared radiation and reflection radiation heat flows on the surface of a lunar orbit spacecraft. The method disclosed by the invention is based on integral computation formulas for the infrared radiation heat flows and the reflection radiation heat flows caused by the lunar surface to the surface of the lunar orbit spacecraft and is characterized in that lunar surface infinitesimal elements are divided through a uniform simulation method, discretization is carried out to the integral computation formulas, and accumulation of radiation heat exchange among infinitesimal element faces is converted; and according to energy balance of infrared heat flows and absorbed solar heat flows of each infinitesimal area of a lunar sunlight face, a computation method of lunar infinitesimal element face infrared radiation intensity is obtained. Through coordinate conversion and vector expression, computation of the infrared radiation heat flows and the reflection radiation heat flows caused by the lunar surface to the surface of the lunar orbit spacecraft is finally converted to vector (matrix) computation, so that programming computation becomes convenient. Meanwhile, the method is extensively universal and has the advantages that star infrared radiation heat flows and reflection radiation heat flows based on any star, any orbit and a spacecraft with any geometric shape can be computed.
Owner:SHANGHAI AEROSPACE SYST ENG INST
Tunnel geological karst risk evaluation method based on fuzzy judgment
The invention discloses a tunnel geological karst risk evaluation method based on fuzzy judgment. Karst cave water burst evaluation standard and risk rating are quantified. The method mainly comprises the following steps: (1) carrying out tunnel geological survey to obtain formation lithology information of a tunnel and surrounding rock nearby the tunnel; (2) if lithology is soluble rock types comprising limestone, dolomites, gypsum salts or soluble conglomerate rock or is positioned nearby an insoluble rock contact zones and the water level is lower than underground water level and is higher than karst development lower limit, then evaluating the tunnel geological karst risk as high risk; (3) acquiring hydrogeological information of the tunnel and the surrounding rock nearby the tunnel, establishing an index hierarchy table, and calculating a risk grade value according to the index hierarchy table and fuzzy mathematics; and (4) determining the karst cave water burst grade according to the risk grade value. The karst cave water burst evaluation standard and the risk rating are quantified, and are visible; and the degree of the influence factor can be clearly judged according to scores.
Owner:长江三峡勘测研究院有限公司(武汉) +1
Method and equipment for solving bivariate error-containing straight line fitting problem
PendingCN110222299ASolve the problem of straight line fitting with errorsSolve the straight line fitting problemComplex mathematical operationsAlgorithmLine fitting
The invention provides a method and equipment for solving bivariate error-containing straight line fitting problem. The method comprises the following steps: establishing a function model and a randommodel of indirect adjustment; initializing X0 and solving a parameter correction amount; updating the parameter estimation value and carrying out iterative solution until convergence; and performingprecision assessment. By means of the scheme, the problem of optimal estimation of the linear slope and the intercept under the condition that bivariates contain errors is solved, and precision evaluation is completed. According to the method, a complex model and an iteration format of a weighted overall least squares (WTLS) method are avoided, the model is clear, the mathematical form is simple,and programming calculation is easy.
Owner:NO 63921 UNIT OF PLA
Chaotic time sequence prediction method based on particle swarm optimization and auto-encoder
PendingCN111222706AImprove generalizationWell-posedForecastingNeural architecturesFeature extractionOriginal data
The invention discloses a chaotic time sequence prediction method based on particle swarm optimization and an auto-encoder, and belongs to the field of chaotic time sequence modeling analysis of complex systems. Aiming at the defects of a traditional simple model during chaotic time sequence prediction, the prediction method improves the mode of directly predicting the acquired data by the traditional model by combining the characteristics that the stack self-encoding network can perform unsupervised feature extraction for multiple times and the intelligent optimization algorithm does not require strict mathematical conditions. The method comprises the following steps: firstly, mapping original data to a high-dimensional space by applying chaos and phase space reconstruction theories, revealing evolution information contained in the hybrid power system, then carrying out feature extraction by utilizing a stack self-encoding network, and finally, carrying out prediction; optimizing theoutput weight of the prediction model through the particle swarm optimization algorithm, so that the model has better generalization performance, and finally, the prediction precision of the chaotic time sequence model is effectively improved.
Owner:DALIAN UNIV OF TECH
Coal bearing property logging sensitive parameter evaluating method
The invention provides a coal bearing property logging sensitive parameter evaluating method and belongs to the field of unconventional oil and gas exploration and development. The coal bearing property logging sensitive parameter evaluating method is based on coal core scale logging and comprises extracting and establishing coal bearing property logging rapid evaluation indexes and forming an expository mode by combining natural gamma logging value and density logging value with limetone stratum density logging mean value. The coal bearing property logging sensitive parameter evaluating method achieves rapid and intuitional explanation of gas reservoir of coal seams.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for solving lateral oscillation frequencies of inhaul cables under any boundary constraint condition
ActiveCN107808038AHigh precisionSimplify the solution processGeometric CADDesign optimisation/simulationOmegaComputer science
The invention discloses a method for solving lateral oscillation frequencies of inhaul cables under any boundary constraint condition. The method comprises the following steps of: firstly establishinga lateral oscillation functional of an inhaul cable; solving the lateral oscillation functional of the inhaul cable by adoption of a Chebyshev series method so as to obtain a lateral oscillation circular frequency of the inhaul cable; and finally calculating a lateral oscillation frequency f of the inhaul cable through a formula f=<omega> / 2<pi>. In the process of constructing the lateral oscillation functional, boundary constraint parameters at two ends of the inhaul cable are set; after boundary constraint conditions at the two ends of the inhaul cable are obtained, the boundary constraint parameters at the two ends of the inhaul cable can be obtained to be used in the lateral oscillation functional of the inhaul cable; and in the process of solving the lateral oscillation functional ofthe inhaul cable by adoption of the Chebyshev series method, a feature matrix equation of the inhaul cable is obtained through selecting a proper inhaul cable lateral oscillation displacement distribution function, and the lateral oscillation circular frequency of the inhaul cable is obtained through solving the feature matrix equation. The method has the advantages of being relatively small in error and relatively high in precision on the basis of a simple solution process.
Owner:NINGBO UNIV
Fine carving machining method for patterns on bottom surface of mould cavity
ActiveCN104462639ASmooth transfer speedSave storage spaceSpecial data processing applicationsEngravingAfter treatmentEngineering
The invention discloses a fine carving machining method for patterns on the bottom surface of a mould cavity. A relatively independent pattern program is cut through the most appropriate machining range, and then an actual machining program is obtained. The machining method avoids the phenomena of over-cutting, cutter bouncing and cutter jumping in the machining process. The program is simple, the calculation amount of after-treatment is not large, and the storage space occupied by the program is small. In the actual machining process, the transmission speed of data is smooth, the phenomena of pause and nesting of data transmission are avoided, and the accuracy of the machined patterns on the bottom surface of the mould cavity is high. For some irregular patterns on the bottom surface of the mould cavity, the machining rules can be better found after the machining range is enlarged and are not damaged when the program after calculation is cut, and the machining effect is better.
Owner:江苏文光模具技术有限公司
A clinker phase recognition method in cement-based material CT images based on Sobel edge detection
InactiveCN109255766AEasy to program and calculateImage enhancementImage analysisPattern recognitionImaging condition
The invention relates to a clinker phase recognition method in cement-based material CT images based on Sobel edge detection, which is used for recognition and processing of cement-based material CT images. The method comprises the following steps of: cutting a CT image of a cement-based material and selecting a representative region; for the region to be identified, using the Sobel operator to calculate the gradient in the horizontal and vertical directions, and calculating the global gradient. According to the image condition, the threshold value is selected and binarized to obtain the clinker phase in the CT image of cement-based material. The invention is simple in operation, low in calculation consumption, and can achieve good CT image recognition effect, and has strong practical value.
Owner:TSINGHUA UNIV
Crack identification method and system of tight sandstone formation
ActiveCN108627878ARelationship is clearEasy to program and calculateElectric/magnetic detection for well-loggingDesign optimisation/simulationLithologyPhysical property
The invention discloses the crack identification method and system of tight sandstone formation. The method comprises the following steps of based on deep induction logging data and medium induction logging data, acquiring a deep induction response value and a medium induction response value and acquiring a deep induction response average value and a medium induction response average value; basedon the deep induction response value, the medium induction response value, the deep induction response average value and the medium induction response average value, acquiring a first regression coefficient; based on the first regression coefficient, the deep induction response average value and the medium induction response average value, acquiring a second regression coefficient; based on the deep induction response value, the medium induction response value, the deep induction response average value, the first regression coefficient and the second regression coefficient, acquiring a doubleinduction difference coefficient; and setting a threshold, comparing the threshold and the double induction difference coefficient and identifying a crack. In the invention, through calculating the double induction difference coefficient and comparing with the threshold, a high angle crack in tight sandstone can be effectively identified, and the identification is not affected by changes in formation lithology, a physical property, oiliness and the like.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for evaluating cleaning condition of secondary water supply tank
ActiveCN110619488ACleaning is convenient and timelyConvenient and timely evaluationService pipe systemsWater mainsAttenuation coefficientUltrasound attenuation
The invention discloses a method for evaluating the cleaning condition of a secondary water supply tank. The method comprises the following steps: step 1, calculating a sample attenuation coefficientin an evaluation analysis time range and a water temperature corresponding to the sample attenuation coefficient; 2, calculating a theoretical attenuation coefficient and a risk attenuation coefficient corresponding to the sample attenuation coefficient, wherein the theoretical attenuation coefficient is obtained by calculating a regression equation of the clean attenuation coefficient along withthe change of the water temperature and the initial residual chlorine concentration, which is obtained by using a regression analysis method; and 3, pairing and comparing the sample attenuation coefficients with the corresponding risk attenuation coefficients, and if the mean value of the sample attenuation coefficients is significantly greater than the mean value of the corresponding risk attenuation coefficients, judging that the cleaning condition of the water tank is significantly worsened. The technical problem to be solved by the invention is how to conveniently and timely evaluate the cleaning condition of the water tank so as to ensure that qualified tap water is provided for users.
Owner:重庆昕晟环保科技有限公司
Method for calculating curved surface stress distributed in fluid based on numerical simulation
ActiveCN108021760AAccurate calculationEasy to program and calculateDesign optimisation/simulationSpecial data processing applicationsSurface stressStress distribution
The invention discloses a method for calculating curved surface stress distributed in fluid based on numerical simulation. In a calculating model, virtual faces and grid interfaces both have grid elements such as coordinates, sizes and pressure differences and both have the same mathematical and physical significance. The difference between the virtual faces and the grid interfaces relies on whether the face is generalized into a curved face or not. When iterative solution is conducted on the whole model, the grid interfaces not generalized into curved faces allow water flow to pass through, and the virtual faces generalized into curved faces do not allow water flow to pass through. That is, in model calculating, the virtual faces are curved surfaces. Thus, the stress of the curved faces can be obtained after obtaining the stress of the virtual faces. The stress distribution of the curved faces in a mathematical model can be accurately calculated and fine analyzed; in addition, for thecharacteristic that the curved face stress distribution calculation amount is large, a calculating logic conforms to a computer programming logic, and programming calculating is easy.
Owner:POWERCHINA ZHONGNAN ENG
Method for solving surrounding rock stress and displacement of shallow-buried tunnel in cavern-containing stratum under action of gravity
ActiveCN110377990AThe solution steps are clearEasy to understandDesign optimisation/simulationSpecial data processing applicationsSurface forceMutual influence
The invention provides a method for solving surrounding rock stress and displacement of a shallow-buried tunnel of a cavern-containing stratum under the action of gravity. The method comprises the following steps: calculating a complex potential analytic function of surrounding rock stress and displacement of the shallow-buried tunnel under the action of gravity field stress release load; calculating additional surface force caused by the tunnel on the boundary of the cavity; calculating a surrounding rock stress and displacement complex potential analytic function of the cavity under the action of the additional surface force; calculating an additional surface force caused by the cavity on the tunnel boundary; calculating a surrounding rock stress and displacement complex potential analytic function of the tunnel under the action of the accessory surface force; repeatedly executing the processing process until a set stop condition is met; and superposing the complex potential analyticfunction obtained by previous iteration to obtain a final complex potential analytic function of the surrounding rock stress and displacement of the shallow-buried tunnel and a final calculation formula of the surrounding rock stress and displacement. According to the method, the mutual influence between the tunnel and the cavity can be considered; gravity field stress release in the tunnel excavation process can be considered, the solving efficiency is high, and the solving precision is good.
Owner:BEIJING JIAOTONG UNIV
Acoustic coupling method of coupling acoustic fields
ActiveCN104918184ASolve difficult problemsHigh precisionTransducer circuitsCouplingInterface impedance
The invention discloses an acoustic coupling method of coupling acoustic fields. The method comprises setting a coupling interface impedance of two coupling acoustic fields, selecting a sound pressure function of each acoustic field, determining a Lagrange functional of each acoustic field according to a variational method, determining coupling energy of the two coupling acoustic fields, determining a coupling rigidity matrix of a coupling acoustic space coupling interface and a rigidity matrix corresponding to each acoustic field and a quality matrix corresponding to each acoustic matrix, performing combinations according to the rigidity matrixes of the two acoustic fields, the quality matrixes of the two acoustic fields and the coupling rigidity matrix, determining a coupling acoustic field characteristic equation, and obtaining coupling acoustic field acoustic forecast information. The acoustic coupling method has the advantages of rapid convergence of a forecast information and less resources needed by calculation.
Owner:HARBIN ENG UNIV
Steady state calculating method of ground fault of undercurrent grounding electric power system
ActiveCN107037321AEasy to program and calculateAccurate calculationFault location by conductor typesDecompositionElectric power system
The invention discloses a steady state calculating method of a ground fault of an undercurrent grounding electric power system. The steady state calculating method of a ground fault of an undercurrent grounding electric power system is characterized in that: when a ground fault occurs in the undercurrent grounding electric power system, each operation parameter has asymmetric components, and as the positive sequence and negative sequence impedance and the zero sequence impedance of part of elements are different, a node admittance equation set cannot be listed directly to calculate; and through the method, decomposition is carried out in the node admittance equation set according to the symmetrical component method, and the positive sequence, negative sequence and zero sequence components are respectively calculated, and then a equation set is formed to calculate, so that the steady state voltage of each node and the steady state current of each branch can be solved when the ground fault occurs in the undercurrent grounding electric power system. The steady state calculating method of a ground fault of an undercurrent grounding electric power system can provide quantified data support for analyzing the ground fault of the electric power system.
Owner:STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
Thermal chemical balance ablation database construction method of multi-component thermal protection material
ActiveCN106844440AAvoid repeated callsImprove versatilityStructured data retrievalSpecial data processing applicationsEngineeringThermal protection
The invention provides a thermal chemical balance ablation database construction method of a multi-component thermal protection material. The method puts forward an ablation characteristic database construction method of the multi-component thermal protection material filtered based on ablation master control components in an aerodynamic heating environment. The method has relatively good applicability on materials with a composition of any two or more components and any incoming flow gas components, has the characteristics of being convenient and fast in construction method, low in research and development cost, can provide direct data support for ablative heat response prediction and ablation performance evaluation of thermal protection structures.
Owner:CHINA ACAD OF AEROSPACE AERODYNAMICS
Transfer matrix calculation stability optimization method based on dimensionless analysis
ActiveCN110807225AEasy to implementIncreased number of degrees of freedomGeometric CADSustainable transportationTransfer matrixEngineering
The invention aims to provide a transfer matrix calculation stability optimization method based on dimensionless analysis. The transfer matrix calculation stability optimization method comprises the following steps: substituting a fourteen-equation tubular beam model through a method of setting dimensionless parameters, and establishing a straight tube dimensionless model; expressing the fourteen-equation dimensionless model in the form of a matrix equation, then solving the matrix equation by utilizing a Laplace transformation method, and finally obtaining a frequency domain dimensionless transfer matrix model; introducing boundary conditions, external acting force and other definite solution conditions , calculating the pipeline dynamics problem, and drawing response curves of the torsional vibration velocity and the transverse vibration velocity ; obtaining the upper limit frequency and the maximum pipe length of stable calculation of the transfer matrix, carrying out segmentation processing on the pipeline exceeding the maximum pipe length, and eliminating the phenomenon of unstable calculation in a segmentation dimension expansion mode. According to the method, the optimization process does not cause great increase of the variable freedom degree number, and high calculation efficiency is ensured while the problem of unstable calculation is solved.
Owner:HARBIN ENG UNIV
A method for finely engraving patterns on the bottom surface of a mold cavity
ActiveCN104462639BSmooth transfer speedSave storage spaceSpecial data processing applicationsEngravingSurface patternData transmission
The invention discloses a finely carved processing method for a pattern on the bottom surface of a mold cavity, which cuts relatively independent pattern programs through the most appropriate processing range, thereby obtaining the most realistic processing program. This kind of processing method avoids the phenomenon of over-cutting, springing and jumping of the knife during the processing. Because the program is relatively simple and the amount of calculation for post-processing is not too large, the storage space occupied by the program is relatively small. In actual processing, the data transmission speed is relatively smooth, and there is no pause and nesting phenomenon in data transmission, which makes the pattern precision of the processed cavity bottom surface higher. For some irregular patterns on the bottom surface of the cavity, after enlarging the processing range, you can better find out the processing rules and rules, and cutting the calculated program will not destroy the rules and rules, making the processing effect better. it is good.
Owner:江苏文光模具技术有限公司
Calculation method for surrounding rock stress and displacement of shallow tunnel with cavity under gravity
ActiveCN110377990BThe solution steps are clearEasy to understandDesign optimisation/simulationSpecial data processing applicationsGravitational forceSurface force
Owner:BEIJING JIAOTONG UNIV
A method for constructing and using a mathematical model for saving hot water for bathing
ActiveCN112685896BEasy to program and calculateImprove work efficiencyDesign optimisation/simulationMathematical modelEngineering
Owner:电子科技大学成都学院
A Method for Tunnel Geological Karst Risk Assessment Based on Fuzzy Judgment
The invention discloses a tunnel geological karst risk evaluation method based on fuzzy judgment. Karst cave water burst evaluation standard and risk rating are quantified. The method mainly comprises the following steps: (1) carrying out tunnel geological survey to obtain formation lithology information of a tunnel and surrounding rock nearby the tunnel; (2) if lithology is soluble rock types comprising limestone, dolomites, gypsum salts or soluble conglomerate rock or is positioned nearby an insoluble rock contact zones and the water level is lower than underground water level and is higher than karst development lower limit, then evaluating the tunnel geological karst risk as high risk; (3) acquiring hydrogeological information of the tunnel and the surrounding rock nearby the tunnel, establishing an index hierarchy table, and calculating a risk grade value according to the index hierarchy table and fuzzy mathematics; and (4) determining the karst cave water burst grade according to the risk grade value. The karst cave water burst evaluation standard and the risk rating are quantified, and are visible; and the degree of the influence factor can be clearly judged according to scores.
Owner:长江三峡勘测研究院有限公司(武汉) +1
Fracture Identification Method and System for Tight Sandstone Formation
ActiveCN108627878BRelationship is clearEasy to program and calculateElectric/magnetic detection for well-loggingDesign optimisation/simulationLithologyComputer science
The invention discloses the crack identification method and system of tight sandstone formation. The method comprises the following steps of based on deep induction logging data and medium induction logging data, acquiring a deep induction response value and a medium induction response value and acquiring a deep induction response average value and a medium induction response average value; basedon the deep induction response value, the medium induction response value, the deep induction response average value and the medium induction response average value, acquiring a first regression coefficient; based on the first regression coefficient, the deep induction response average value and the medium induction response average value, acquiring a second regression coefficient; based on the deep induction response value, the medium induction response value, the deep induction response average value, the first regression coefficient and the second regression coefficient, acquiring a doubleinduction difference coefficient; and setting a threshold, comparing the threshold and the double induction difference coefficient and identifying a crack. In the invention, through calculating the double induction difference coefficient and comparing with the threshold, a high angle crack in tight sandstone can be effectively identified, and the identification is not affected by changes in formation lithology, a physical property, oiliness and the like.
Owner:CHINA PETROLEUM & CHEM CORP +1
Construction method of thermochemical equilibrium ablation database for multi-component thermal protection materials
ActiveCN106844440BAvoid repeated callsImprove versatilityStructured data retrievalSpecial data processing applicationsThermodynamicsProcess engineering
The invention provides a thermal chemical balance ablation database construction method of a multi-component thermal protection material. The method puts forward an ablation characteristic database construction method of the multi-component thermal protection material filtered based on ablation master control components in an aerodynamic heating environment. The method has relatively good applicability on materials with a composition of any two or more components and any incoming flow gas components, has the characteristics of being convenient and fast in construction method, low in research and development cost, can provide direct data support for ablative heat response prediction and ablation performance evaluation of thermal protection structures.
Owner:CHINA ACAD OF AEROSPACE AERODYNAMICS
An Acoustic Coupling Method for Coupling Sound Fields
ActiveCN104918184BSolve processing problemsHigh precisionTransducer circuitsInterface impedanceCoupling
The invention discloses an acoustic coupling method of coupling acoustic fields. The method comprises setting a coupling interface impedance of two coupling acoustic fields, selecting a sound pressure function of each acoustic field, determining a Lagrange functional of each acoustic field according to a variational method, determining coupling energy of the two coupling acoustic fields, determining a coupling rigidity matrix of a coupling acoustic space coupling interface and a rigidity matrix corresponding to each acoustic field and a quality matrix corresponding to each acoustic matrix, performing combinations according to the rigidity matrixes of the two acoustic fields, the quality matrixes of the two acoustic fields and the coupling rigidity matrix, determining a coupling acoustic field characteristic equation, and obtaining coupling acoustic field acoustic forecast information. The acoustic coupling method has the advantages of rapid convergence of a forecast information and less resources needed by calculation.
Owner:HARBIN ENG UNIV
Method for forecasting inherent frequency of liquid-filled cylindrical shell
ActiveCN110795783AIncreased number of degrees of freedomEasy to implementGeometric CADThin shellsState vector
The invention aims to provide a method for forecasting the inherent frequency of a liquid-filled cylindrical shell. The method comprises the following steps: establishing a free vibration equation ofthe cylindrical shell by adopting a Kennard thin shell theory; solving a Helmholtz wave equation under a cylindrical coordinate system, fluid acts on a cylindrical shell as a radial load, and a hydrodynamic model of the cylindrical shell is established; selecting an improved state vector; obtaining the relationship between the element displacement, the rotation angle, the force and the like of thetraditional state vector and the middle surface displacement according to the Kennard thin shell theory, so as to establish a conversion matrix between the improved state vector and the traditional state vector; introducing boundary conditions at two ends of the liquid-filled cylindrical shell to forecast the inherent frequency of the liquid-filled cylindrical shell. According to the method, thederivation workload of the first-order derivative equation and the transfer matrix and the possibility of derivation errors are reduced, the application range is wide, the implementation process is simple and convenient, and programming calculation is facilitated. The prediction precision is high, the whole solving process does not cause increase of the variable freedom degree number, and high prediction efficiency is ensured.
Owner:HARBIN ENG UNIV
General Solution Method of Bearing Capacity Transfer Matrix of Composite Loaded Pile
ActiveCN106650131BTroubleshoot load bearing issuesEasy to program and calculateGeometric CADCAD numerical modellingAxial forceSoil resistance
The invention discloses a combined loaded pile bearing capacity transfer matrix general solution method. The method comprises the following steps that a combined loaded pile general solution stress analysis model is built, and a general expression convenient for finding pile-soil interaction relation during the general solution is provided; according to the one-dimensional linear characteristics of a transfer matrix, discretization, uniformization and constant processing are conducted on the soil resistance coefficient, the distribution of axial force of a pile and horizontal load distribution of the pile; analytical general solutions of the transfer matrix coefficient of a free section of the pile, the transfer matrix coefficient of a flexible section of the pile and the transfer matrix coefficient of a plasticity section of the pile are obtained by means of the Laplace direct-inverse transform derivation; based on the principle of the transfer matrix method, boundary conditions of the pile top and the pile end are substituted, and accordingly the combined loaded pile bearing capacity general solution is obtained. In the method, the analytical expression of the transfer matrix coefficients is very simple, programming calculation is convenient, the method is very good in adaptability and universality, and the problem of combined loaded pile bearing characteristics under various working conditions in the geotechnical engineering can be well solved.
Owner:CEEC JIANGSU ELECTRIC POWER DESIGN INST
A Method of Finding Feature Points of Irregular Shaped 3D Parts
ActiveCN105665922BFind quicklyPrecise positioningLaser beam welding apparatusComputer scienceIrregular shape
The invention discloses a searching method for feature points of an irregular-shape three-dimensional workpiece. The searching method comprises the following steps that the workpiece is arranged in the mode that the diameter face of a round hole in the workpiece is horizontal; a first starting point B is found on the diameter face of the round hole; coordinates of a first X-axis stop point B1 and coordinates of a second X-axis stop point B2 are obtained; coordinates of the X-axis central point B3 of the first X-axis stop point B1 and the second X-axis stop point B2 are calculated; a second starting point A is found on the diameter face of the round hole, coordinates of a first Y-axis stop point A1 and coordinates of a second Y-axis stop point A2 are obtained; coordinates of the Y-axis central point A3 of the first Y-axis stop point A1 and the second Y-axis stop point A2 are calculated; coordinates of the circle center C are determined; the radius r of the round hole is measured through the circle center C, and two quadrantal points N and P are found; coordinate transformation is carried out based on the found circle center C and the found quadrantal points N and P. By means of the searching method, feature points can be quickly found, and a base is provided for machining the workpiece.
Owner:SHANGHAI PURUIMA INTELLIGENT TECH CO LTD
A Calculation Method for Lateral Vibration Frequency of Cables with Arbitrary Boundary Constraints
ActiveCN107808038BHigh precisionSimplify the solution processGeometric CADDesign optimisation/simulationOmegaDistribution function
Owner:NINGBO UNIV
An evaluation method of coal-bearing logging sensitive parameters
ActiveCN104234706BQuick explanationIntuitive explanationBorehole/well accessoriesUnconventional oilDensity logging
The invention provides a coal bearing property logging sensitive parameter evaluating method and belongs to the field of unconventional oil and gas exploration and development. The coal bearing property logging sensitive parameter evaluating method is based on coal core scale logging and comprises extracting and establishing coal bearing property logging rapid evaluation indexes and forming an expository mode by combining natural gamma logging value and density logging value with limetone stratum density logging mean value. The coal bearing property logging sensitive parameter evaluating method achieves rapid and intuitional explanation of gas reservoir of coal seams.
Owner:CHINA PETROLEUM & CHEM CORP +1
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