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66 results about "Coupling equation" patented technology
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Multi GPU calculation based reverse time migration imaging method of 3D TTI medium
ActiveCN105717539AIncrease occupancyGood energy focusSeismic signal processingReverse timeWave field
The invention discloses a multi GPU calculation based reverse time migration imaging method of a 3D TTI medium. According to the method, a stable second-order coupling equation set serves as a calculation model, finite SV wave components are given to enhance the wave field spreading stability, an anisotropy parameter matching method is used to suppress interference of pseudo-transverse waves, uniform anisotropy boundaries corresponding to a random speed boundary and other parameters are introduced, storage of large amount of wave field data and frequency disk reading and writing are avoided, and a GPU-based CUDA platform is used to realize high-performance parallel calculation. According to the invention, a second-order coupling quasi-acoustic equipment in the TTI medium is solved in a difference method on the basis of multi-GPU parallel calculation technology, wave field spreading is stable, pseudo-transverse waves are suppressed effectively, application of the random boundary reduces wave field storage and disk reading and writing, a multi-asynchronous-flow high parallel strategy of multi GPU calculation is used, the calculation efficiency is improved obviously, and the imaging method meets requirements for industrialization of anisotropy reverse time migration.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
Method and system for optimizing artificial fracture parameters of shale gas reservoir
InactiveCN109472037AEfficient combinationFluid removalDesign optimisation/simulationPorous mediumNetwork model
The invention discloses a method and a system for optimizing artificial fracture parameters of shale gas reservoir, which comprises the following steps: establishing a fracture network model after shale gas reservoir is fractured; The coupled equations of flow and deformation in matrix and fracture are determined. Establish shale gas horizontal well productivity model after fracturing; The shale gas productivity of the post-pressure productivity model is calculated, and the artificial fracture parameters are optimized based on the principle of maximizing the productivity. The invention provides a productivity calculation method after shale gas reservoir fracturing considering the coupling of deformation and flow of porous media, and an optimal combination of artificial fracture parametersof shale gas reservoir can be obtained according to the principle of maximizing productivity.
Owner:CHINA PETROLEUM & CHEM CORP +1
Energy internet collaborative optimization operation method
ActiveCN110046750AFast convergenceThe optimization results are in line with realitySingle network parallel feeding arrangementsForecastingIntegrated energy systemCoupled carrier
The invention discloses an energy internet collaborative optimization operation method. The method mainly comprises the following steps that a heat supply network and a power grid distributed energy optimization model are established with the lowest operation cost of a power grid and the lowest operation cost of the heat supply network as targets; a gas turbine is used as a coupling carrier of a heat supply network and a power grid, and the two regions are coupled through a coupling equation to form a distributed energy optimization model of the electricity-heat interconnection integrated energy system; the distributed energy optimization model of the electricity-heat interconnection integrated energy system is solved by adopting an improved synchronous ADMM algorithm, and the optimal distribution of controllable resources of a heat supply network and a power grid is obtained through repeated iteration. According to the invention, the gas turbine is used as electricity-heat coupling link, a node temperature transient equation is introduced on the basis of considering the existence of time scale difference in different energy utilization, the synchronous ADMM is used for carrying out collaborative optimization on electric energy and heat energy, the algorithm has good convergence, and the optimization result better conforms to the reality.
Owner:STATE GRID JIANGSU ECONOMIC RES INST +3
Medium rough surface finite element electromagnetic simulation method based on integral boundary
InactiveCN103279600AImprove accuracyAvoid incomplete absorptionSpecial data processing applicationsRough surfaceFunctional methods
The invention discloses a medium rough surface finite element electromagnetic simulation method based on integral boundary. The medium rough surface finite element electromagnetic simulation method based on the integral boundary mainly solves the problem that similarity of inhomogeneous media and approximate absorbing boundary are difficult to solve by integral equation class methods. The medium rough surface finite element electromagnetic simulation method based on the integral boundary comprises the achieving steps of using a monte carlo method for obtaining a medium rough surface, carrying out truncation processing and scattering on the medium rough surface through an artificial boundary, acquiring a finite element equation of a simulation area according to a functional method inside the simulation area, using an integral equation method for obtaining integral boundary conditions outside the simulation area, forming an electromagnetic coupled equation through continuous conditions, and finally obtaining radar scattering parameters of the medium rough surface by solving an electromagnetic coupled matrix equation. Compared with the prior art, the medium rough surface finite element electromagnetic simulation method based on the integral boundary can be more easily used for simulating inhomogeneous medium electromagnetic problems than the integral equation class methods, can improve electromagnetic simulation precision compared with the approximate absorbing boundary, and can be used for acquiring the electromagnetic scattering parameters of medium rough surface unbounded area problems.
Owner:XIDIAN UNIV
Design method for inner side and outer side air layer thickness of condensation-preventing external thermal insulation wall body
InactiveCN103088937AAvoid enteringWallsClimate change adaptationMathematical modelThermal insulation
The invention discloses a design method for the inner side and the outer side air layer thickness of a condensation-preventing external thermal insulation wall body, and belongs to the technical field of wall body structures. The design method comprises the steps of (1) building a heat transmission and humidity transmission mathematical model of the external thermal wall body, (2) identifying a humidity accumulation rate, and (3) solving a heat and humidity coupled equation by utilizing a finite volume method. The design method fundamentally overcomes the fatal defects that the interior of a building wall body is easy to humidify, condense and mildew, and airtight, and is capable of comprehensively improving heat-insulating and energy-saving properties and an indoor living comfort level of a building space enclosing structure in a breakthrough mode.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Method of evaluating power grid power purchasing combination revenue and risk under peak regulation constraint
The invention relates to a method for evaluating the income and risk of power grid power purchase portfolio under the constraints of peak regulation. The weighted conditional risk value is used to measure the power purchase risk of provincial power grid companies, and a multi-objective optimization model for power grid companies to maximize expected revenue and minimize risks is established. . Under the background of implementing peak-valley time-of-use electricity price on the electricity sales side, taking into account the constraints of the provincial power grid’s peak regulation and the power-quantity coupling equation of inter-provincial power purchases, the multi-objective quantum particle swarm algorithm is used to solve the problem, and different benefits and risks are obtained. The horizontal inter-provincial and intra-provincial optimal power purchase combination sets for various markets allow power purchase decision makers to make rational power purchase decisions based on their own risk preferences and allocate power purchases reasonably. The method proposed by the invention reflects the profit and risk level of power grid companies participating in inter-provincial power purchase transactions in the regional power market environment, and uses intuitive economic signals to reflect the risk value. Provide reference for power grid companies to coordinate and optimize inter-provincial and intra-provincial power purchases.
Owner:STATE GRID FUJIAN ELECTRIC POWER CO LTD
Calculation method for predicting ship resistance based on CFD
InactiveCN105955928ASave computing resourcesReduce computing timeComplex mathematical operationsGravity centerDiscretization
Owner:SHANGHAI LINGYAO SHIP ENG CO LTD
Lost foam casting analysis method
Owner:GM GLOBAL TECH OPERATIONS LLC
Optical fiber parameter calculating method and device, full-optical phase regeneration device and PSA
ActiveCN105867045AReduce power consumptionLarge phase sensitivityNon-linear opticsVibration amplitudePhase sensitive
The invention provides an optical fiber parameter calculating method and device, and aims to obtain optical fiber parameters via calculation. The invention further provides a phase sensitive amplifier and a full-optical phase regeneration device, wherein the phase sensitive amplifier is used for regeneration of full-optical phase; the involved optical fiber is obtained by using the calculating method and the calculating device. The optical fiber parameter calculating method comprises the following steps: acquiring signal optical waves, first pumping optical waves and second pumping optical waves, performing four-wave mixing in an optical fiber of double-pump degeneracy PSA so as to generate four sideband-idle optical waves, establishing a 7-wave value model, and dissolving a coupling equation of the signal optical waves, and calculating so as to obtain vibration amplitude phase of the regenerated optical waves; adjusting non-linear phase shift and optical second-order dispersion coefficients, so as to obtain the minimum and optimal optical second-order dispersion coefficient corresponding to non-linear phase shift. The optical fiber is manufactured according to the parameter, the optical fiber is applied to PSA, then the PSA has relatively large GER and works in relatively small non-linear phase shift, and furthermore, a regeneration device of low power consumption and full optical phase can be obtained.
Owner:SUZHOU UNIV
Four-hydraulic-motor-driven self-synchronizing vibrating hammer and structural parameter determining method thereof
InactiveCN104278675AImprove synchronicityGeometric CADSpecial data processing applicationsHydraulic motorDynamic models
The invention provides a four-hydraulic-motor-driven self-synchronizing vibrating hammer and a structural parameter determining method thereof. The four-hydraulic-motor-driven self-synchronizing vibrating hammer comprises four hydraulic motors, an upper rotating beam, a lower rotating beam, a transmission shaft, a pile clamp, an upper plate, a lower plate, an upper cabinet and a lower cabinet. The structural parameter determining method includes building a same-direction rotation dynamic model of the four-hydraulic-motor-driven self-synchronizing vibrating hammer; acquiring a dimensionless coupling equation of four eccentric rotors; acquiring conditions for the eccentric rotors to realize synchronization; acquiring stability conditions for the eccentric rotors to realize synchronous running so as to determine structural parameters of the four-hydraulic-motor-driven self-synchronizing vibrating hammer. Effect, of system vibrating coupling characteristics, on improving synchronicity is taken into consideration, a mode of hydraulic motor driving and self-synchronizing transmission is adopted for creative designing of structure of the vibrating hammer, and the objective of four-hydraulic-motor driving and self-synchronizing is achieved by controlling the structural parameters of the vibrating hammer.
Owner:NORTHEASTERN UNIV
Method for simulating vulcanization process of rubber product
InactiveCN101996272AMaterial thermal analysisSpecial data processing applicationsChemical reactionVulcanization
The invention discloses a method for simulating the vulcanization process of a rubber product, which comprises the following steps of: measuring a rubber flow curve and thermal physical parameters through tests; establishing a hybrid dynamic model and a thermal physical function of the rubber; establishing a heat transfer-chemical reaction coupled equation of the rubber product; performing numerical calculation on the equation based on a Newton iteration method; and acquiring at least one physical parameter related to the rubber product model. The method can more accurately simulate the heat transfer process and the crosslinking process of the rubber vulcanization.
Owner:JIANGSU UNIV OF SCI & TECH
Method for optimizing provincial new energy purchasing quantity under peak and valley electricity prices
InactiveCN106651224APromote digestionBroaden the thinking of power purchase decision-makingForecastingResourcesElectricity priceNew energy
The invention relates to a method for optimizing the provincial new energy purchasing quantity under peak and valley electricity prices. By considering a power and electric quantity coupled equation for provincial electricity purchasing, peak shaving surplus in a provincial power grid, and upper limit and lower limit standby constraints for power grid operation and the like, in the background of implementing the peak and valley electricity prices at the electricity selling side of the power grid, a peak and valley electricity price and provincial new energy purchasing integrated optimal model is established by taking the maximal purchasing and selling electricity price difference of a power grid company, namely the purchasing social benefit, as the target. A peak and valley electricity price optimization method based on the consumer psychology is adopted; a load response curve is changed by changing a peak and valley electricity price scheme; therefore, influence at the requirement side is brought into the provincial new energy purchasing; and solving is carried out through a quantum-behaved particle swarm optimization algorithm, so that the optimal peak and valley electricity price scheme, the provincial new energy purchasing quantity and the total purchasing quantity in the province are obtained. By means of the method disclosed by the invention, influence of the peak and valley electricity price on the provincial new energy purchasing benefit, and influence of the provincial new energy purchasing on the purchasing economy and energy conservation and emission reduction benefit of the provincial power grid can be reflected; and a new thought is provided for a purchasing decision of the provincial power grid.
Owner:STATE GRID FUJIAN ELECTRIC POWER CO LTD
Fluid-solid coupling numerical simulation method for evaluating effect of wellbore strengthening in fractured formation
ActiveUS20220012389A1Provide supportSurveyDesign optimisation/simulationClassical mechanicsFluid solid coupling
A fluid-solid coupling numerical simulation method for evaluating the effect of wellbore strengthening in a fractured formation includes steps of: establishing an elastic deformation equation of rocks around the wellbore; establishing and solving the fluid flow equations within fractures and plugging zone, respectively; substituting the discretized elastic deformation equation of the rocks around the borehole wall into the fluid flow equations of fractures to obtain a fluid-solid coupling equation set for wellbore strengthening in a fractured formation; and finally solving the fluid-solid coupling equation set; and substituting basic parameters into the fluid-solid coupling equation set, and simulating mechanical response characteristics, width evolution characteristics and flow distribution characteristics of plugged fractures under different parameter combinations. The present invention systematically considers the complex flow states of plugged fractures during wellbore strengthening, as well as the deformation and seepage characteristics plugging zone under multi-force coupling.
Owner:SOUTHWEST PETROLEUM UNIV
Method for simulating vulcanization of all-steel radial tire
ActiveCN102218840AImprove product qualityImprove vulcanization processTyresVulcanizationChemical reaction
The invention discloses a method for simulating the vulcanization of an all-steel radial tire, comprising the following steps of: obtaining flow curves and thermal physical parameters of all kinds of rubbers in the tire and vulcanization torque-time change curves of crude rubbers in the tire and thermal physical parameters of a water bag to obtain a corresponding vulcanization degree-time change relationship curve, a vulcanization degree-vulcanization reaction speed change curve and induction times under three constant temperatures of 135 DEG C, 145 DEG C and 160 DEG C; then defining the thermal physical property and / or vulcanization dynamics characteristic of the material in each part of the tire, wherein the vulcanization dynamics characteristic of the rubber in the tire is defined by using a hybrid dynamics model; then rapidly dividing grids on the tire by using a grid dividing method; establishing a heat transfer-chemical reaction coupling equation for the vulcanization of the tire; carrying out numerical calculation on the coupling equation based on a Newton iteration method; and more accurately and efficiently simulating a heat transferring process and an interlinking process for the vulcanization of the tire via a computer and predicting the temperature and the vulcanization degree of each point in the tire.
Owner:JIANGSU UNIV OF SCI & TECH
Power and time joint allocation method in D2D wireless power supply communication network
InactiveCN108462975AIncrease profitNetwork traffic/resource managementInformation transmissionData transmission
The invention provides a power and time joint allocation method in a D2D wireless power supply communication network. The method includes the following steps: step 1, constructing a D2D wireless powersupply communication network; step 2, calculating the energy absorbed by a D2D transmission node, a signal to interference and noise ratio of a D2D receiving node, and an achievable data transmissionrate of D2D users based on the D2D wireless power supply communication network; step 3, deriving a coupling equation of the transmission power and information transmission time of the D2D users basedon the data transmission requirements of the D2D users; and step 4, performing joint iterative calculation on the transmission power and information transmission time of the D2D users based on the coupling equation and the energy constraints and time constraints of the D2D users. According to the method provided by the invention, multiple pairs of D2D users are allowed to perform communication atthe same time, the utilization rate of time resources can be improved, a method for jointly calculating the transmission power and transmission time of the D2D users can be proposed, and a guidance method can be provided for the resource allocation based on a concurrent transmission model in the D2D wireless power supply communication network.
Owner:SHANGHAI JIAO TONG UNIV
Hybrid microgrid optimization operation method considering harmonic and voltage imbalance constraints
ActiveCN110601198AGuarantee power qualityPolyphase network asymmetry elimination/reductionPolyphase network asymmetry reductionMicrogridEngineering
Owner:NINGBO POWER SUPPLY COMPANY STATE GRID ZHEJIANG ELECTRIC POWER
CFD calculation method for forecasting ship resistance
InactiveCN105243203ASave computing resourcesReduce computing timeComplex mathematical operationsDiscretizationSmall unit
The invention provides a CFD calculation method for forecasting ship resistance. The method comprises: S1: adopting a two-phase incompressible RANS as a control equation, wherein the control equation comprises a continuity equation and a momentum equation; S2: processing a free surface by using a single-phase level set method; S3: discretizing a computational domain into a series of small units by using a finite volume method, calculating flow field information, and storing the information in a grid unit gravity; S4: obtaining a value of a unit surface according to an interpolation value of the unit gravity; S5: obtaining a volume integral of a unit body by summing the value of the unit surface; and S6: performing iterative solution on a pressure and velocity coupling equation obtained after discretization by adopting a PISO implicit separation algorithm, and finally obtaining a convergent numerical solution, wherein the calculation of each time step comprises momentum estimation, pressure solution and velocity correction. The calculation method is relatively small in amount of calculation and high in accuracy.
Owner:SHANGHAI LINGYAO SHIP ENG CO LTD
Plate structure-sound field coupling analysis method and device and computing device
ActiveCN104951596AUnit quality requirements are lowReduce roughnessSpecial data processing applicationsEngineeringAnalysis method
The invention discloses a plate structure-sound field coupling analysis method. The method includes the steps that a finite element method and a radial point interpolation method are combined, and dispersing is conducted on a system kinetic equation of a plate structure; a boundary integral equation of a sound field domain is established according to a boundary element method; a structure-sound field coupling equation is established according to a dispersed system kinetic equation, the boundary integral equation and the structure-sound field coupling boundary condition. The invention further discloses a plate structure-sound field coupling analysis device corresponding to the plate structure-sound field coupling analysis method and a computing device with the plate structure-sound field coupling analysis device.
Owner:HUNAN UNIV
Kinetic analysis method of underground perforation tool under effect of multiple absorbers
PendingCN107844666AOvercoming the paradox between injuriesReduce risk of sabotageGeometric CADDesign optimisation/simulationStructure analysisEngineering
The invention discloses a kinetic analysis method of an underground perforation tool under effect of multiple absorbers, which includes steps of S1, structure analysis and perforation technique analysis according to the underground perforation tool; S2, establishment of kinetic models of two absorbers; S3, establishment of oscillatory differential equation of the underground tool; S4, establishment of a coupling condition of an oil pipe pillar-absorbers-perforation gun, wherein the pipe pillar kinetic model based on the effect of two absorbers has two coupling borders, the border at the coupling place adopts a force continuity condition, thus the coupling equation can be acquired; S5, solution of the kinetic model of the pipe pillar. The kinetic analysis method has the beneficial effects of reducing the accidents of unsealing failure of a packer for excessive stress, reducing the risk of tester damage caused by excessive acceleration, and avoiding unstability and damage of the oil pipepillar.
Owner:SOUTHWEST PETROLEUM UNIV
Hydrocarbon saturation evaluation method based on rock electrical structure coefficient
ActiveCN104181090AMulti-solutionImprove saturation calculation accuracyPermeability/surface area analysisOperabilityCoupling equation
The invention provides a hydrocarbon saturation evaluation method based on a rock electrical structure coefficient, and belongs to the hydrocarbon saturation evaluation field. The method comprises the following steps: (1) determining the rock electrical structure coefficient tau; (2) determining a coupling equation of the rock electrical structure coefficient tau and an m index; and (3) determining the hydrocarbon saturation. By using the method, the calculation accuracy of the hydrocarbon saturation of a fractured-vuggy reservoir is greatly improved; and the method has good maneuverability and practicability, and changes a situation that a result is calculated according to experience or complex numerical simulation at present when an Archie theory is corrected.
Owner:CHINA PETROLEUM & CHEM CORP +1
Coil current switching algorithm based on motion system of magnetic levitation planar motor of photo-etching machine
ActiveCN109639197AAvoid sudden changes in currentReduce heat lossElectronic commutation motor controlVector control systemsRange of motionEngineering
The invention provides a coil current switching algorithm based on the motion system of the magnetic levitation planar motor of a photo-etching machine. Firstly, a coupling equation between the six-degrees-of-freedom force and the coil current of a planar motor mover is established. Secondly, mover coils are divided into a switching group and a non-switching group according to whether the mover coils will leave directly above a magnetic steel array during the motion of the planar motor mover, and the switching group is further divided into a sudden switching group and a gradient switching group according to the way the coils leave the magnetic steel array. An S function is used as a current switching weight function for the sudden switching group, and a cosine function is used as a currentswitching weight function for the gradient switching group. With the minimum 2-norm of all coil current vectors as the objective, the coupling equation of force and current is solved to obtain the current value of each coil. The heating loss of the coils of the planar motor can be reduced as much as possible, and smooth switching of the coil currents in the full motion range of the mover of a moving coil type magnetic levitation planar motor can be realized.
Owner:TSINGHUA UNIV +1
Data-dependent physically-real restoration method of object deformation sequences
InactiveCN104361633AImprove efficiencySimple calculation3D modellingPhysical realityLagrange's theorem (number theory)
The invention provides a data-dependent physically-real restoration method of object deformation sequences. According to the method, with a key model of sparse sampling on a time axis being used as input, a whole deformation sequence of the model can be quickly generated. The method includes: subjecting the key model to modal analysis, using an obtained mode as module base to reduce dimensionality of a kinetic equation which describes object deformation, and decomposing mutually-coupled equations into multiple equations mutually independent; converting a continuous deformation problem of solving time into a problem of solving a minimum of time integration, and acquiring an analytical expression according to the Euler-Lagrange theorem; finally, solving a linear equation set to obtain a complete deformation sequence. The mode and data dependence obtained in the modal analysis process allow deformation of an input model to be well described and also allows data dimensionality to be greatly reduced; the results include analytical expressions, allowing real-time interaction; the results meet the kinetic equation of object deformation and are of physical reality.
Owner:BEIHANG UNIV
Reactive power adjustment scheme of series transformer in unified power flow controller under DC magnetic bias
InactiveCN106532723AAccurate calculationImprove applicabilityFlexible AC transmissionAc network voltage adjustmentDecompositionTransformer
The invention belongs to the technical field of transformers, and particularly relates to a reactive power adjustment scheme of a series transformer in a unified power flow controller under DC magnetic bias. The reactive power adjustment scheme comprises the steps of firstly building a magnetic circuit model according to a spatial geometry structure of the series transformer; calculating magnetic resistance of iron cores in different areas by adopting effective magnetic permeability and listing a magnet circuit equation; obtaining a coupled equation by combining a circuit equation of an external port of the transformer; carrying out discretization processing on a differential equation by adopting a theta integral method and calculating exciting current under asymmetric magnetic bias by adopting a Newton-Raphson method; carrying out harmonic decomposition on the exciting current; calculating reactive power of the series transformer under the asymmetric DC magnetic bias by combining subharmonic components of the exciting current and winding induction voltage; and feeding back a change of the reactive power of the series transformer in a magnetic bias state to a converter valve and improving the precision of voltage regulation through adjusting output of the reactive power. The reactive power adjustment scheme is high in calculation speed and wide in application range, and has very high practical application value.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
Stem-stern joint steering depth control strategy of underwater vehicle and PID controller thereof
ActiveCN109144080ASolving Strong Nonlinear Coupling ProblemsDepth effectAltitude or depth controlAutomatic controlSteering control
The invention, which belongs to the field of automatic control, discloses a stem-stern joint steering depth control strategy of an underwater vehicle and a PID controller thereof. In order to solve aproblem of strong non-linear coupling between a depth channel and a longitudinally inclined channel during underwater vehicle controlling by using a stem rudder and a stern rudder, the invention putsforward a stem-stern joint steering control strategy based on the nonlinear coupling characteristic with full consideration of the strong nonlinear coupling characteristic between the stem rudder andthe stern rudder. A stem-stern joint control law of a depth channel and a stem-stern joint control law of a longitudinally inclined channel are extracted; a coupled equation set is established; and then the coupled equation set is solved to obtain respective control laws of the stem rudder and the stern rudder, thereby realizing depth controlling of an underwater vehicle having the stem rudder andthe stern rudder. Therefore, a problem of strong non-linear coupling between a depth channel and a longitudinally inclined channel during the depth controlling of the stem rudder and the stern rudderis solved theoretically; the designed controller is close to the engineering reality; and the good control effect is realized.
Owner:HUAZHONG UNIV OF SCI & TECH
Well wall reinforcement condition determining method and system, and well wall reinforcement method and system
ActiveCN110541703ARealize fine controlImprove pressure bearing capacityConstructionsBorehole/well accessoriesWell drillingHeat stress
The invention relates to the field of bored well exploration, and discloses a well wall reinforcement condition determining method and system, and a well wall reinforcement method and system. The wellwall reinforcement condition determining method comprises the steps that according to a well wall reinforcement model, preset bearing pressure of a well wall, and a fluid-solid-heat coupling equation, the target temperature, needing to be reached through cooling, of the well wall and fracture aperture distribution of fractures, extending towards the stratum, of the well wall are calculated; the temperature of drilling fluid is obtained according to the target temperature, needing to be reached through cooling, of the well wall; and particle size distribution of a reinforcement material is obtained according to the fracture aperture distribution and particle size matching criterion. According to the well wall reinforcement condition determining method, on the one hand, quantitative representation can be conducted on the required temperature of the drilling fluid in the well wall reinforcement process and particle size distribution of the reinforcement material, and accordingly, precisecontrol over the well wall reinforcement process is achieved; and on the other hand, through heat stress generated through temperature change, the influence of reinforcement material filling on the peripheral stress of a well is improved, and accordingly, the pressure bearing capacity of the well wall is improved.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Solar sail attitude orbit coupling control method based on model prediction control
ActiveCN109164817AImprove High Par Value Ratio FeaturesAvoid quality problemsAttitude controlKinematicsDynamic equation
The invention provides a solar sail attitude orbit coupling control method based on model prediction control. The method comprises the following steps: step 1: establishing a control torque and a control force model of RCDs in solar sail attitude orbit control; step 2: establishing a relative kinematics and dynamics equation of solar sail orbit motion of an earth-moon system; step 3: establishinga relative kinematics and dynamics equation of solar sail attitude motion of the earth-moon system; step 4: establishing a solar sail relative motion coupling equation in combination with the equations of the step 2 and the step 3; and step 5: designing a control rate by using the coupling equation obtained in the step 4 and using a model prediction control method. According to the solar sail attitude orbit coupling control method provided by the invention, the RCDs is used as an attitude orbit drive of the active control of the solar sail, the control rate of the solar sail attitude orbit isdesigned by using the model prediction control method, so that the coupling and saturation of the driver and the output limit of a solar sail attitude angle in an attitude orbit coupling control process can be conveniently solved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Lost foam casting analysis method
ActiveUS20060000577A1Overcome viscous resistanceCasting safety devicesFoundry mouldsEngineeringAnalysis method
Parameters specifying properties of the materials used in the lost foam casting process are input at an input step. Numerical methods may be used to simultaneously solve a set of coupled equations relating thermal properties, flow properties, and other physical properties of the metal and foam. A profile number Ω and an engulf number E may be evaluated using the values of physical quantities determined during the numerical solution step. Once values for the profile number Ω and engulf number E have been determined, these values may be checked to see if they lie within appropriate ranges.
Owner:GM GLOBAL TECH OPERATIONS LLC
Method for measuring three-dimensional displacement by high-speed photography
ActiveCN109099845AEasy to handleEasy to installUsing optical meansVideokymographyVertical displacement
The invention discloses a method for measuring three-dimensional displacement by high-speed photography, comprises the following steps of measuring the vertical displacement of one end of a rod usinga wire displacement sensor, and capturing a mark at the other end of the rod using a high speed camera; listing a coupled equation between the physical quantities measured by the two devices by usingthe coupling relationship between the linear displacement sensor and the high-speed photography in measuring the rod; squaring and adding the two sides of the equation multiple times in the solution,eliminating a azimuth angle and a zenith angle in the three-dimensional motion of the rod, and transforming the coupling equation into a quadratic equation with only the unknown lambda (t); finally, transforming the three-dimensional displacement in the high-speed camera coordinates into a three-dimensional displacement in the world coordinate system by using the relationship between a world coordinate system and the high-speed camera coordinate system, and realizing the three-dimensional displacement measurement of the free end of the rod. The invention has the advantages that the data processing is simplified, the equipment installation is simple, the equipment is not affected by the impact during the measurement process, and the safety of the equipment is protected.
Owner:JIANGXI HONGDU AVIATION IND GRP
Heating adjusting and controlling method and system
InactiveCN108613250AImprove effective utilizationStrong data supportHeating fuelLighting and heating apparatusEngineeringNetwork topology
The invention discloses a heating adjusting and controlling method and system. The method comprises the following steps that a hydraulic and thermal coupled equation is built in a preset heat-supply network topology model according to preset heating parameters, wherein the heating parameters comprise heating parameters of a heating station, heating parameters of all users, parameters of a heat-supply network, parameters of a heat insulation layer, physical property parameters of a heating medium, climatic information and geographic position; temperature loss and hydraulic loss in the heating process are calculated according to the coupled equation, energy consumption is analyzed, and a first heating allocation scheme is obtained according to an optimization method; and the first heating allocation scheme is sent to the heating station so as to guide staff to adjust and control heating. The problems that hydraulic distribution is not reasonable and heat is imbalanced in the heating process are solved, and the heating reliability and effective use rate of energy are improved.
Owner:SOUTH CHINA UNIV OF TECH
Method for simulating unfreezing process and optimizing unfreezing process by adopting COMSOL software
ActiveCN110309530AOptimize the thawing processImprove thawing uniformityDesign optimisation/simulationSpecial data processing applicationsThree levelMathematical model
The invention discloses a method for simulating an unfreezing process and optimizing an unfreezing process by adopting COMSOL software. The method comprises the following steps: carrying out dynamic numerical simulation on a minced fillet thawing process by adopting COMSOL Multiphysics software, carrying out numerical solution on a coupling equation of electromagnetic wave dissipation and heat transfer by using a finite element method, and verifying a temperature value through an experiment; exploring the influence of the size of the minced fillet sample, the position of the minced fillet sample in the heating cavity, the radio wave power, the polar plate spacing and the heating intermittent time on the unfreezing uniformity of the minced fillet sample through a mathematical model established by COMSOL Multiphysics software; and finally designing a three-factor three-level orthogonal test by taking radio wave power, pole plate spacing and heating interval time as factors and taking time and temperature standard deviation required by thawing of a minced fillet sample as evaluation indexes of thawing effects according to the numerical value simulation result, determining the proper radio wave power, pole plate spacing and heating interval time, optimizing a thawing process, and improving the thawing uniformity.
Owner:FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI
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