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67 results about "Conservation principle" patented technology
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Oil and gas reservoir numerical simulation calculation method
InactiveCN103246820AGood calculation stabilityImprove stabilitySpecial data processing applicationsFluid phaseGas phase
The invention provides an oil and gas reservoir numerical simulation calculation method. The method includes calculating oil phase pressure, water phase pressure and gas phase pressure of a spatial dispersion post simulation process at any moment, calculating total volume flow of fluid in the flowing direction according to the oil phase pressure, water phase pressure and gas phase pressure of the spatial dispersion post simulation process at any moment, calculating oil saturation, gas saturation and water saturation according to the total volume flow of the fluid in the flowing direction and correcting the oil saturation, the gas saturation and the water saturation according to the substance conservation principle. In the method, the pressure is calculated in one step, the speed is calculated in one step, and branch flow and saturation are calculated in multiple steps, velocity item calculation is introduced, and calculation misconvergence caused by factors such as anisotropy, fluid phase change and unreasonable production systems is avoided. The numerical simulation stability is better, the convergence condition is easy to judge, and the method is suitable to be applied when a common oil and gas reservoir numerical simulation method sinks into misconvergence.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Coal/shale isothermal adsorption experiment method
InactiveCN103994960AReduce the number of gas injectionsShorten adsorption experiment timePermeability/surface area analysisAdsorption equilibriumConservation principle
The invention provides a coal / shale isothermal adsorption experiment method. The method is carried out by a reference kettle, a sample kettle and a middle region of an experiment device; a sample to be detected is placed in the sample kettle and an experiment temperature is set to be constant according to actual stratum conditions; the sample kettle is calibrated to obtain a free space volume of the sample kettle; the reference kettle and the sample kettle are vacuumized to obtain the initial pressure of the sample kettle; the middle region is communicated with the reference kettle and the middle region is separated from the sample kettle; enough amount of adsorbate gas is injected into the reference kettle one time; after the pressure in the middle region is balanced with the pressure in the reference kettle, the initial pressure of the reference kettle is obtained; an adsorption experiment is carried out to obtain the pressure of the reference kettle and the pressure of the sample kettle after adsorption is balanced; according to a mass conservation principle before and after each time of adsorption, the adsorption amounts under different sample kettle pressures after a plurality of times of adsorption balance are obtained by using the initial pressure of the sample kettle, the initial pressure of the reference kettle, the free space volume of the sample kettle and the pressure of the reference kettle and the pressure of the sample kettle in an adsorption process.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Harmonic current detection method for novel active power filter
ActiveCN106501574AAvoid the disadvantages of needing to detect voltage amplitudeAccurate detectionCurrent/voltage measurementControl signalHarmonic
The invention discloses a harmonic current detection method for a novel active power filter (APF). According to the method, for the acquired voltage of a common connection point in a three-phase power grid voltage unbalanced system, the relationship between the grid-side voltage and the compensated grid-side current is represented through introducing an electrical conductance factor. The effective value of a fundamental positive sequence voltage is calculated according to the power conservation principle of the active power filter. Meanwhile, a lagrangian function between the harmonic content of the power grid current and the power grid voltage is constructed, and a target power grid current is obtained through the method of seeking extreme values. Meanwhile, the difference between the target power grid current and a load current is figured out and then is inverted, so that a compensating current command value is obtained. Therefore, the power control of the active power filter is realized, and a control signal is generated based on the PWM technique. The output of the active power filter is controlled. According to the technical scheme of the invention, the phase voltage in the traditional algorithm is replaced by the fundamental wave positive sequence component of the voltage, so that the compensated current waveform of the system is kept to change synchronously along with the fundamental wave positive sequence component of the voltage. Therefore, the defect in the prior art that harmonics cannot be completely eliminated during the power grid voltage distortion process can be overcome.
Owner:XUZHOU UNIV OF TECH
Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain
The invention provides a pressure bearing water level determining method for constant-flow water pump of a lower foundation pit of a suspension type waterproof curtain. According to the method, the ground water level when the waterproof curtain doesn't enter an aquifer and the ground water level change caused by the waterproof curtain are determined in a constant-flow water pumping process based on obtained soil layer information and water pumping information of the pressure bearing aquifer and according to the Darcy law and the water volume conservation principle. Thus, pressure bearing water levels in and out the lower foundation pit of the suspension type waterproof curtain in constant-flow water pump can be determined. By means of combination of the Darcy law, the water volume conservation principle and the ground water percolation theory, the distribution of pressure bearing water levels in and out the foundation pit can be visually reflected in foundation pit dewatering. Therefore, basis for analyzing effects of foundation pit dewatering on the surroundings is provided. The method is simple, practical, convenient to popularize and large in application value.
Owner:SHANGHAI JIAO TONG UNIV
Low-pressure economizer energy saving assessment method applied to power plant thermal system
ActiveCN104732451AEasy and reasonable installationEasy to installData processing applicationsSystems intergating technologiesPower capabilityPower station
The invention discloses a low-pressure economizer energy saving assessment method applied to a power plant heat system. The method includes the steps that step1, the heat balance diagram parameters, generated before a low-pressure economizer is installed, of the power plant heat system are obtained; step2, the heat balance diagram parameters, generated after the low-pressure economizer is installed in a parallel connection or series connection mode, of the power plant heat system are obtained, and in combination with the step1, the change of extraction flow of each stage of is obtained; step3, according to the change, obtained in the step2, of the extraction flow of a heater of each stage, based on the extraction flow conservation principle, the variation of the power capability of a turbine is calculated; step4, the variation of the coal consumption of a power plant is calculated and used for assessing the energy saving quantity of the low-pressure economizer, wherein the larger the variation of the coal consumption of the power plant is, the larger the energy saving quantity of the low-pressure economizer will be. According to the method, the low-pressure economizer can be reasonably installed; the load change of the heater of each stage can be displayed, the influence on the coal consumption of the system from the power of an auxiliary engine can be displayed as well, and therefore calculation results are more real and more reliable.
Owner:STATE GRID CORP OF CHINA +1
Method and device for measuring viscosity of high-temperature high-pressure fluid
InactiveCN102305753AOvercoming Inherent Flaws in Measuring Fluid ViscosityEasy to operateDirect flow property measurementAutomatic controlCapillary Tubing
The invention discloses a method and a device for measuring the viscosity of a high-temperature high-pressure fluid. A tube bank length capillary tube measurement method which is applicable to viscosity measurement of various fluids at different temperature and under different pressure is obtained by extending a classical method for measuring the viscosity of a fluid by using a capillary tube on the basis of a constant flow conservation principle in fluid mechanics. The viscosity of the fluid is mainly calculated by utilizing the difference of pressure drops generated when fluids to be measured which have the same mass flow, temperature and pressure flow through capillary experimental tubes with different lengths under laminar flow conditions. The device which applies the method heats thefluid and preserves heat through external world and a temperature controller is used for automatic control to compensate the heat loss of heat dissipation of the fluid in the flowing process, so thatmore accurate experimental data of the viscosity is obtained. The method and the device are easy to operate, and are applicable to the measurement of the viscosity of fluids under different pressure and at different temperature.
Owner:BEIHANG UNIV
Passenger flow forecasting method for combined transportation of integrated passenger transport hubs
InactiveCN109034506AAvoid Consulting UncertaintyAvoid problems such as broadness of analogyForecastingTraffic predictionMode of transport
The invention discloses a passenger flow prediction method for integrated passenger transport hub intermodal transport, comprising the following steps: first, dividing the integrated passenger transport hub transport mode; second, dividing the integrated passenger transport hub transport mode; 2, predicting the passenger flow of the main body of the passenger transport; 3, predicting the transferproportion of the connecting traffic; 4, predicting the passenger flow of the connecting traffic; 5, predicting the traffic transfer quantity of the combined transport: according to the arrival-departure conservation principle, the traffic transfer proportion distribution table of the combined transport is obtained through matrix calculation, and the traffic transfer quantity of each combined transport is calculated by multiplying the daily average passenger transfer quantity of each transportation mode by the transfer proportion distribution table. The method standardizes the passenger flow forecasting method of integrated passenger transport hub and fills in the blank of the industry; performs quantitative data analysis, standardized prediction process, avoids the interference of subjective factors, improves design efficiency, shortens the design cycle; conforms to the regional socio-economic and transportation development law, improves the applicability and accuracy of the design results.
Owner:CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
Original meter reading data processing method for remote calibration of operating errors of intelligent electric energy meter
ActiveCN107741578ARealize remote detectionDoes not change meter structureElectrical measurementsSpecial data processing applicationsData integritySimulation
The invention relates to an original meter reading data processing method for remote calibration of operating errors of an intelligent electric energy meter. The original meter reading data processingmethod comprises the processing steps that 1, real-time checking is performed; 2, data integrity is checked; 3, data integration is adding of electric energy meter reading data to historical meter reading data of the electric energy meter based on original meter reading data; 4, missing items are processed; 5, data analysis is performed to find out abnormal data; 6, orthogonal checking is performed. The original meter reading data processing method utilizes a flow conservation principle and a big data analysis technology to achieve remote detection of massive online operating electric energymeter errors without standard device adding, meter structure change and electric energy meter cluster topology change. By adopting the method, a correction topology model based on virtual branch circuits is established, wire loss is a variable value, calculation results and change are concerned, 100% reliability of electric energy meter error measurement is achieved, and the electric energy meteris more accurately guided to change work.
Owner:TIANJIN ELECTRIC POWER TECH DEV CO LTD
Optimization method of gold hydrometallurgy displacement process
ActiveCN104199389AGuaranteed RecoveryReduce processing costsProgramme total factory controlChemical reaction kineticsDynamic equation
The invention provides an optimal control method of a gold hydrometallurgy displacement process. The optimal control method comprises the steps of process data acquisition, auxiliary variable selection and data preprocessing, replacement process optimization model building, replacement process optimizing and the like; the optimal control method is characterized in that a replacement rate mechanism model is built by virtue of a chemical reaction dynamics equation and the material conservation principle, a gold mud grade data model is built by use of a KPLS algorithm, and the replacement process is optimized by use of a self-adaptive iterative optimization algorithm with a correction term. The invention also provides a software system for implementing the replacement process optimization; the software system comprises a main program, a database and a human-computer interaction interface; the system software operates on the model computer of a hydrometallurgy synthesis process control system as a hardware platform. The optimal control method of the gold hydrometallurgy displacement process is applied to the replacement process of a gold hydrometallurgy factory to optimize the additive amount of zinc powder, and the result indicates that the method succeeds in guaranteeing the recovery rate of gold, reducing the treatment cost of subsequent steps and increasing the economic benefits.
Owner:NORTHEASTERN UNIV LIAONING
Inductive energy storing type pulse power supply for electromagnetic emission
ActiveCN104617807AStrong current amplification capabilityIncrease the current levelEngineeringInductor
The invention relates to an inductive energy storing type pulse power supply for electromagnetic emission, and belongs to the technical field of electromagnetic emission. The pulse power supply comprises a primary power supply Us, a first inductor L1, a second inductor L2, a first thyristor T1, a second thyristor T2, a third thyristor T3, a fourth thyristor T4, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first capacitor C1, a second capacitor C2 and n inducting modules; each inducting module comprises an inductor, a thyristor, a plurality of diodes and a capacitor. According to the inductive energy storing type pulse power supply for electromagnetic emission, the inductors can be highly coupled; the inductor current is multiplied according to the magnetic flux conservation principle and can be also amplified due to series charging and parallel discharging of each inductor, and therefore, high-current multiplying is achieved; the variation rate of the current can be reduced to lower down the withstand voltage of a main pipe; meanwhile, the inductive energy storing type pulse power supply has the advantages of being high in energy storing density, high in structure expandability, and suitable for electromagnetic emission.
Owner:TSINGHUA UNIV
Method for automatically acquiring initial reeling and unreeling radius of reel material printing equipment
InactiveCN104512093ASolve efficiency problemsSolve the errorRotary pressesPrinting press partsColor printingEngineering
The invention discloses a method for automatically acquiring initial reeling and unreeling radius of reel material printing equipment. The method for automatically acquiring the initial reeling and unreeling radius of the reel material printing equipment includes that feeding manually, guaranteeing that there is no material belt redundancy between an unreeling traction unit, an n-color printing unit and a reeling traction unit, eliminating the material belt redundancy of the unreeling region and the reeling region, emptying encoder values of servo motors of each unit, forwardly rotating the servo motor of the unreeling unit by one circle, recording the encoder value thereof, re-eliminating the material belt redundancy of the unreeling region and the reeling region, respectively recording the encoder values of the servo motor of the unreeling traction unit and the servo motor of the unreeling unit, and calculating the initial radius of an unreeling and reeling roller according to a material belt length conservation principle. The method for automatically acquiring the initial reeling and unreeling radius of the reel material printing equipment solves the problems of low efficiency and obvious error of a direct measurement method, improves the equipment control precision, and improves the automatic degree and production efficiency of the equipment.
Owner:XIAN UNIV OF TECH
Power-driven unicycle
The invention provides a power-driven unicycle which mainly changes the steering mode of the existing unicycle product in the market; a left steering handlebar rod and a right steering handle rod are arranged under a seat and are fixedly connected with a supporting frame in a matching way so as to lead the steering mode of the power-driven unicycle to be similar to a conventional bicycle; and as the steering mode is well known by a majority of persons, a beginner is easy to learn and master the driving technique of the power-driven unicycle. In addition, according to the conservation principle of angular momentum, a legrest connecting rod which extends to the front of a wheel is arranged so as to increase the rotating radius of a body of an operator around a vertical axis and improve the capacity of preventing the undesirable spinning or rotation. In addition, the invention also proposes a structure installation method which can lead the seat of the operator to tend to the non-steering position returning to the center and facing the front. Therefore, the stability and the operating performance of the power-driven unicycle are improved.
Owner:南通凯奥净化科技有限公司
Combined exploitation gas mixed source proportion quantitative determination method of coal seam group
InactiveCN110286003AGuarantee production safetyOvercoming problems that cannot be quantitatively determinedComponent separationWithdrawing sample devicesChemical compositionNoble gas
The invention discloses a combined exploitation gas mixed source proportion quantitative determination method of a coal seam group. The combined exploitation gas mixed source proportion quantitative determination method comprises the steps of dividing master control gas constituents of representing different target coal layers by measuring conventional gas constituent content, an isotope value thereof, rare gas constituent content and an isotope value thereof in a gas of each target coal layer control point in a control region and by an isotope geochemistry method; performing fitting to obtain master control gas constituent content and an isotopic contour map; obtaining main control gas constituent content and an isotope value thereof of each target coal layer of a combined exploitation driving hole by an interpolation method; and building a calculation model according to a chemical composition mass conservation principle, and quantitatively determining a mixing ratio of each target coal layer in the mixed source gas. By the method, the mixed source proportion of different target coal layers in the combined exploitation gas can be accurately calculated, the problem that the mixed source gas under a coal mine cannot be quantitatively determined is solved, a theoretical basis is provided for standard-reaching evaluation of coal layer gas exploitation, and the mine production safety is effectively guaranteed.
Owner:CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
Calculation method suitable for transfer rate matrix of composite state spatial model
ActiveCN105893332AAvoid manual creationVersatilityComplex mathematical operationsResearch ObjectState space
The invention discloses a calculation method suitable for a transfer rate matrix of a composite state spatial model. The calculation method comprises the following steps: 1: dividing a research object into subsystems, and determining a composite sequence; 2: establishing the state spatial model of each subsystem, and listing and writing the transfer rate matrix; 3: adopting a transfer frequency conservation principle to carry out state merging on the subsystems to obtain the transfer rate matrix after subsystem is simplified; 4: according to a composite sequence, successively combining, correcting and simplifying the subsystems to finally obtain the transfer rate matrix corresponding to the state spatial model of the research object; and 5: substituting the transfer rate matrix of the research object into a state space method calculation formula to obtain each steady-state probability of the research object. The calculation method can adopt the formula to directly list and write the transfer rate matrix corresponding to the combined state spatial model, so that the combination and simplification process of the state spatial model can be realized through programming software including Matlab and the like, and a state spatial algorithm is convenient and universal.
Owner:HEFEI UNIV OF TECH
Cellular ad hoc network radio resource optimization and allocation method
InactiveCN102170700AReduce overheadImprove utilizationHigh level techniquesWireless communicationQuality of serviceDecomposition
The invention relates to a cellular ad hoc network radio resource optimization and allocation method which comprises the following steps: for a given system model and parameters, obtaining a performance objective function which can be realized under a cooperative relay protocol and can select a monotonic increasing function reflecting the generation speed of application layer data required by users; giving the following constraint conditions required to be met by realizing performance indexes: different QoS (quality of service) requirements of end-users, a flow conservation principle, maximum and minimum transmission power requirements and attainable speed requirements; carrying out Lagrangian dual decomposition according to the objective function and the constraint conditions, respectively decomposing to a physical layer, a network layer and an application layer of OSI (open system interconnection), and respectively carrying out the optimized solution on each layer by using a sub-gradient mathematical method; and after respectively solving the optimization sub-problems of the physical layer, the network layer and the application layer, obtaining the optimal flow distribution, relay selection, transmission power and data generation speed distribution of each sub-carrier. The method provided by the invention ensures better stability and reality, and is suitable for the next generation of cellular ad hoc cooperative networks.
Owner:GUANGZHOU UNIVERSITY
Metho for evaluating dynamic stability of foam in rock core oil-displacing process
ActiveCN108548835AOvercoming the Difficulty of Dynamic StabilityIn line with actual productionAnalysis using nuclear magnetic resonanceNMR - Nuclear magnetic resonanceRock core
The invention relates to a method for evaluating the dynamic stability of foam in a rock core oil-displacing process, and belongs to the technical field of improvement of oil recovery through foam flooding. In the prior art, foam flooding can significantly improve crude oil recovery, and the stability of foam is a key factor affecting the wide use of the foam flooding technology; the current method for evaluating the stability of foam is mainly a static evaluation method; and in the actual oil displacing process, the foam is subjected to the dynamic process comprising continuous defoaming andcontinuous foam generating, such that the stability of the foam during the oil displacing cannot be truly reflected by using the static evaluation method. According to the present invention, based onthe nuclear magnetic resonance technology and the mass conservation principle, the gas-liquid mass ratio relationship between the inlet end and the outlet end of the rock core is established, and thedynamic instability factor of the foam is defined, wherein the dynamic instability factor of the foam can evaluate the dynamic stability of the foam during the oil displacing of the rock core, and theproblem that the dynamic stability of the foam cannot be evaluated during the oil displacing of the rock core for a long time can be solved.
Owner:SHANGHAI UNIV
Method for determining retention rate of fluorescent whitening agent in pulp fiber system
InactiveCN101561390AThe measurement principle is easy to understandEasy to masterColor/spectral properties measurementsFiberWhitening Agents
The invention discloses a method for determining the retention rate of a fluorescent whitening agent in a pulp fiber system by utilizing an ultraviolet spectrophotometer, namely the amount of the fluorescent whitening agent in a filtrate is quantified through the ultraviolet spectrophotometer, and the retention rate of the fluorescent whitening agent in the fiber system is calculated based on a mass conservation principle. The determination method comprises the following steps of production of a standard curve, collection of the filtrate, pretreatment on the filtrate, determination of the ultraviolet spectrophotometer, determination of a blank sample, and calculation, and a determined result has smaller deviation and good reproducibility. The invention is the method with simplicity, easy operation and good reproducibility for determining the retention rate of the fluorescent whitening agent on the surface of pulp fiber.
Owner:TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
PWM rectifier fuzzy sliding mode variable structure control method when three-phase network voltage is unbalanced
InactiveCN105406741AImprove anti-interference abilityThe mathematical model is not demandingAc-dc conversionVoltage vectorDecomposition
The invention discloses a PWM (Pulse-Width Modulation) rectifier fuzzy sliding mode variable structure control method when the three-phase network voltage is unbalanced, and belongs to the field of power electronics application. The method comprises the following steps of firstly sampling the direct current side voltage of a rectifier; obtaining a rated active power through a PI (Proportional-Integral) controller; sampling the network voltage and the rectifier current, and using a trap filter for performing positive and negative sequence decomposition on the sampling data; listing and writing the power matrix of the rated values by using the rated power conservation principle; obtaining the rated current through a generalized inverse matrix conversion formula; and finally, obtaining a space voltage vector by the fuzzy sliding mode variable structure control method on an electric current loop. The control method has the advantages that the current loop uses the variable structure control, so that the robustness and the dynamic performance of a system can be enhanced; meanwhile, the variable structure coefficient is regulated through fuzzy operation on state points; the adverse influence due to buffeting is reduced; and the stability of the system is improved.
Owner:JIANGSU UNIV
Power-driven unicycle
The invention provides a power-driven unicycle which mainly changes the steering mode of the existing unicycle product in the market; a left steering handlebar rod and a right steering handle rod are arranged under a seat and are fixedly connected with a supporting frame in a matching way so as to lead the steering mode of the power-driven unicycle to be similar to a conventional bicycle; and as the steering mode is well known by a majority of persons, a beginner is easy to learn and master the driving technique of the power-driven unicycle. In addition, according to the conservation principle of angular momentum, a legrest connecting rod which extends to the front of a wheel is arranged so as to increase the rotating radius of a body of an operator around a vertical axis and improve the capacity of preventing the undesirable spinning or rotation. In addition, the invention also proposes a structure installation method which can lead the seat of the operator to tend to the non-steering position returning to the center and facing the front. Therefore, the stability and the operating performance of the power-driven unicycle are improved.
Owner:南通凯奥净化科技有限公司
Method and device for measuring high-temperature and high-pressure wet steam flow
The invention provides a method and device for measuring the high-temperature and high-pressure wet steam flow. The flow of fluid, the flow of a gas phase and the flow of a liquid phase can be obtained through the device without the requirement for separating the gas phase and the liquid phase of wet steam in advance. When the fluid passes through two V cone flowmeters with different diameters, pressure drop will be generated, and the mass flow rate of the fluid passing through a V cone can be calculated through the leant fluid knowledge. On the basis of the mass conservation principle, a basic equation can be derived, and the wet steam dryness can be obtained through the obtained equation. The wet steam flow can be worked out through the wet steam dryness and the flow of the liquid phase, wherein the flow of the liquid phase is measured through an ultrasonic Doppler flowmeter. The flow of the gas phase under the non-standard condition can be converted into the flow of the gas phase under the standard condition through a pressure and temperature sensor. The obtained data are connected with an ADAM data acquisition module, and finally the data are output.
Owner:LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
Method for calculating organic carbon recovery coefficient of biogenic gas source rock
InactiveCN108802337ACalculation formula is reasonable and credibleEasy to getEarth material testingBiogenic gasConservation principle
The invention relates to a method for calculating an organic carbon recovery coefficient of biogenic gas source rock. The method includes steps: firstly, methane is taken as a main component in biogenic gas, carbonic molecules in other components include heavy hydrocarbon and carbon dioxide, the heavy hydrocarbon low in content is negligible according to a carbon element conservation principle, and to be simplified, organic carbon consumed in original hydrocarbon source rock is completely converted into generated methane and carbon dioxide; secondly, a carbon element conservation relation is established, and the original organic carbon content is equal to the amount of residual organic carbon content, generated methane carbon content and generated carbon dioxide carbon content; thirdly, acalculation relation among the organic carbon recovery coefficient, organic carbon gas generating rate and carbon dioxide content in products is established, and a calculation formula of the organic carbon recovery coefficient is obtained. The method is helpful to accurate calculation of biogenic gas resource quantity and planar resource abundance and has guiding significance to determination of favorable exploration areas.
Owner:NORTHEAST GASOLINEEUM UNIV +1
Single gas well liquid production capacity determining method
The invention belongs to the technical field of natural gas development and aims to solve the problems caused by the Sulige gas field interwell concatenation and low-cost development mode, that is, multiple single well gas production pipelines are connected to a main pipe for gathering and transportation, only natural gas flowmeters are arranged at well heads without liquid production capacity metering devices, single well liquid production capacity cannot be obtained, and accordingly many problems occur to the gas field development. The concrete content of the single gas well liquid production capacity determining method is determination of a calculation method for the natural gas single well liquid production capacity, the characteristics of single well water quality stability and uniqueness are used, existing gas field dynamic monitoring single well water composition data are combined, a multivariate first-order equation is established by measuring the main pipe total flow and water compositions according to the natural substance conservation principle and parameters such as single well water ions, and finally the single well liquid production capacity is measured rapidly, so that accurate bases are provided for the evaluation of effectiveness of gas recovery measures through water drainage and well site deployment in areas with the complex gas-water distribution relation.
Owner:PETROCHINA CO LTD
A gyro-type energy conversion device and method for space docking
ActiveCN106347716BRealize rendezvous and dockingReduce the requirement of docking relative speedCosmonautic vehiclesCosmonautic component separationSpace rendezvousMechanical energy
The invention discloses a device and method for gyroscopic type energy conversion for space docking. The energy conversion device can convert kinetic energy generated by a relative speed into rotating kinetic energy of the device through gyroscopic rotation when spacecrafts which have a large speed difference in space docking collide and are combined to be a whole, and thus this part of redundant energy is stored. The energy conversion process of the device is based on the mechanical energy conservation principle, it is guaranteed that the relative linear speeds of the two spacecrafts in rendezvous and docking in the space rendezvous and docking process are small enough, and the device and the method can be applied to rendezvous and docking tasks between the spacecrafts having large relative speeds.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Direct power predictive control method based on load current observation of three-phase six-switch rectifier
ActiveCN105450057BImprove reliabilityImplementation processAc-dc conversionPhase currentsVoltage vector
The invention provides a direct power prediction control method based on three-phase six-switch rectifier load current observation, and discloses a direct power prediction control technology for three-phase rectifier load current observation. The direct power prediction control method comprises the steps of: A, measuring three phases of currents, a three-phase power grid voltage and a DC side capacitor voltage through a current sensor and a voltage sensor respectively; B, calculating voltage vectors corresponding to eight kinds of switch combinations (000, 001, 010, 100, 011, 101, 110, 111) through the measured DC side capacitor voltage; C, passing a given DC voltage through a filter to obtain an instantaneous reference voltage of a sampling period at present, and acquiring an instantaneous reference value of active power according to a DC side and AC side power conservation principle, wherein the reference value of active power is calculated by adopting an observer to estimate a load current; D, predicting active power, reactive power and capacitor voltages corresponding to eight voltage vectors of a rectifier according to the measured phase currents and the phase voltages; E, and calculating a corresponding cost function F, and applying a switching state corresponding to the voltage vector with the minimal cost function value to the rectifier. The direct power prediction control method is applicable to various kinds of three-phase rectifiers and active filters.
Owner:HUAZHONG UNIV OF SCI & TECH
Minimum wetted perimeter volute section numerical value solving method based on speed moment conservation principle
InactiveCN105138840AUniform stress distributionReduce wall thicknessPump componentsPumpsImpellerStress distribution
The invention discloses a minimum wetted perimeter volute section numerical value solving method based on a speed moment conservation principle. When all section of a volute are solved through the speed moment conservation principle, the target of reducing the wetted perimeter, namely the friction area, of the sections is persisted, and thus the hydraulic efficiency of the volute can be easily improved. Two symmetrical straight lines are still used on the lower portions of the sections of the volute on the axis face to form an axis face stream line without a turn, compared with a traditional trapezoid section, the difference that a circular arc in tangent to the two straight lines replaces the structure of two transition circular arcs exists, and the perimeter of the volute is obviously reduced than that of the traditional structure. By means of the two-straight-line type waist at the lower portion of the section mode, water flow entering the volute from an impeller can be prevented from disengaging, the arch formed by the upper single circular arc reduces the section wetted perimeter, and the friction loss of the water flow along the pass is reduced. The numerical value solving method and process for calculating and acquiring all geometric dimensions of the novel section are provided, meanwhile, the stress distribution in the volute becomes more even through the structure, and a possibility is provided for reducing the wall thickness of the volute.
Owner:XIHUA UNIV
Variable-working-condition side-flowing compressor operation space determining method and system
ActiveCN104763662AReduce operating energy consumptionAvoid damagePump componentsPump controlHeat conservationEngineering
The invention discloses a variable-working-condition side-flowing compressor operation space determining method and system. The method comprises performing calculation according to a preset mass flow formula and preset parameters obtained through measurement elements in a side-flowing compressor and obtaining side-flowing compressor second-stage actual mass flow values according to a mass conservation principle; obtaining the side-flowing compressor second-stage actual inlet temperature according to the heat conservation principle ad a first preset formula; obtaining the simplified flow square to outlet pressure ratio according to preset side-flowing compressor second-stage flow coefficients and a preset normalization formula, and obtaining a normalization side-flowing compressor operation and control curve by simplifying the flow square to outlet pressure ratio; obtaining side-flowing compressor operation space through a second preset formula according to side-flowing compressor second-stage actual work condition parameters. By the aid of the method and the system, the safety and operation efficiency of side-flowing compressors can be controlled and improved.
Owner:HANGZHOU HOLLYSYS AUTOMATION
Method of calculating reduction factor of fresh air quantity of air supply vertical shaft for tunnel opened circulatory ventilation
ActiveCN108979697AAvoid cumbersome calculationsEstimated Energy Saving PotentialMining devicesData processing applicationsFresh airReduction factor
The invention discloses a method of calculating a reduction factor of fresh air quantity of an air supply vertical shaft for tunnel opened circulatory ventilation. The method mainly includes: an equivalent fresh air quantity calculation formula for a circulatory flow that flows through a dust remover and is purified; in a controllable circulatory ventilating system, allowing quantity of fresh airinto the air supply vertical shaft to be equal to quantity of discharged polluted air from a discharge vertical shaft, and determining a calculation formula for equivalent quantity of fresh air sent by the air supply vertical shaft; in the controllable circulatory ventilating system, determining a calculation formula for equivalent quantity of fresh air discharged by the discharge vertical shaft;applying the three formulas above in the controllable circulatory ventilating system according to the conservation principle of physics so as to obtain a calculation formula of equivalent quantity offresh air for an ejector segment of a circulatory air duct; acquiring, from the calculation formula, a calculation formula for a reduction factor of fresh air quantity of the air supply vertical shaftin the controllable circulatory ventilating system. When the reduction factor of the fresh air quantity of the air supply vertical shaft in the open controllable circulatory ventilating system is less than 1, the controllable circulatory ventilating system can be executed to reduce actual air supply-discharge quantity.
Owner:HUNAN UNIV OF SCI & TECH
Heat-exchange dehumidification method of tobacco baking device
PendingCN110285651AImprove dehumidification effectIncrease temperatureTobacco preparationDrying gas arrangementsCooking & bakingCooling tower
The invention relates to a heat-exchange dehumidification method of a tobacco baking device, and relates to the technical field of tobacco baking. According to electric power consumed in the running process of a sealed dehumidification heat pump, due to a power conservation principle, one part of energy is finally converted into heat so as to be carried into a drying room along air circulation, so that the temperature of a drying room is improved; and in addition, according to a tobacco drying process, constant temperature and constant humidity need to be kept in a specific time period, a surface air cooler is additionally arranged in a drying system, and heat is taken away through circulating water in the surface air cooler and a cooling tower, so that on one hand, the temperature in the drying room is ensured to be adjustable and a baking process of tobacco leaves is met, and on the other hand, most sensible heat of return air is taken away, the cooling capacity of a dehumidification system is indirectly increased, and finally the dehumidification efficiency of the dehumidification heat pump is improved.
Owner:FOSHAN RUIHAI REFRIGERATION EQUIP
A Coal/Shale Isothermal Adsorption Experimental Method
InactiveCN103994960BReduce the number of gas injectionsShorten adsorption experiment timePermeability/surface area analysisAdsorption equilibriumPressure balance
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Power system probabilistic power flow calculation method based on probability conservation principle
InactiveCN110048428AShort calculation timeImprove efficiencyAc networks with different sources same frequencyProbit modelStatistical analysis
The invention discloses a power system probabilistic power flow calculation method based on the probability conservation principle. The method comprises the following steps of: obtaining various dataof a power system network containing new energy; performing statistical analysis on the historical data of the conventional generator output, the new energy output and the load power, and generating aprobability model of injection power of all nodes of the power system; establishing a linearization model of a power system power flow calculation equation; establishing relational expressions amongprobability density functions of different random variables based on a principle of the probability conservation principle in a probability theory according to a relation of a linear equation; and processing the relational expressions among the probability density functions of different random variables by utilizing the definition and the property of the delta function to generate probability density functions of node voltage, branch power flow and branch active loss in the power system. According to the method, an accurate probability power flow calculation result can be obtained, the probability characteristics of node voltage, branch power flow and branch active loss in the system are reasonably reflected, and the calculation efficiency is high.
Owner:HEBEI UNIV OF TECH
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