125 results about "Conservation law" patented technology

A design process first determines a desired aperture distribution, then converts the electric power conservation law, Snell's law on the rear face side of a dielectric lens, and the formula representing light-path-length constraint, into simultaneous equations, and computes the shapes of the surface and rear face of the dielectric lens depending on the azimuthal angle θ of a primary ray from the focal point of the dielectric lens to the rear face of the dielectric lens, and then reduces the light path length in the formula showing light-path-length constraint by an integral multiple of the wavelength when the coordinates on the surface of the dielectric lens reach a predetermined restriction thickness position. A dielectric lens is designed by sequentially changing the lazimuthal angle θ from its initial value, and also repeating the second and third steps. Thus, downsizing and quantification is realized by zoning while keeping antenna properties at the time of constituting a dielectric lens antenna in a good condition.

A general, computational-mathematical modeling method for the solution of large, boundary-coupled transport problems involving the flow of mass, momentum, energy or subatomic particles is disclosed. The method employs a modeling processor that extracts a matrix operator equation (or set of equations) from a numerical transport code (NTC). The outputs of software codes, available for modeling physical problems governed by conservation laws in the form of differential equations, can be processed into closed-form operator equations with the method. Included is a numerical transport code functionalization (NTCF) model which can be determined numerically, based on a system of solutions of an NTC, evaluating outputs for a given set of inputs. The NTCF model is a linear or nonlinear, multi-variable operator equation or set of such equations. The NTCF model defines relationships between general, time-variable inputs and outputs, some known and some unknown, considered as boundary values. The user of an NTCF model can directly work with the processed model output, instead of running the original numerical code in general applications of a boundary-value problem. The numerical transport code functionalization model can be employed as a surrogate for representing the numerical transport code to provide a solution to the transport problem. The invention enables modeling efficiency and availability to be increased, while computational complexity and cost decreased. Computational times for complex modeling problems can, in some cases, be dramatially reduced, for example by several orders of magnitude.

A computer system and method of simulating the behavior of an oil and gas reservoir including changes in the margins of frangible solids. A system of equations including state equations such as momentum, and conservation laws such as mass conservation and volume fraction continuity, are defined and discretized for at least two phases in a modeled volume, one of which corresponds to frangible material. A material point model technique for numerically solving the system of discretized equations, to derive fluid flow at each of a plurality of mesh nodes in the modeled volume, and the velocity of at each of a plurality of particles representing the frangible material in the modeled volume. A time-splitting technique improves the computational efficiency of the simulation while maintaining accuracy on the deformation scale. The method can be applied to derive accurate upscaled model equations for larger volume scale simulations.

The invention discloses a method for calculating a non-steady state yield of a volume fractured horizontal well of a shale gas reservoir. The method comprises the following steps of dividing the reservoir into a volume fractured region and a non-transformed matrix region, and collecting basic parameters of the volume fractured region, the non-transformed matrix region and the horizontal well, wherein the volume fractured region is Darcy flow, and the non-transformed matrix region is Knudson flow; according to a mass conservation law, establishing a steady-state yield formula of the volume fractured horizontal well of the shale gas reservoir; based on a pressure propagation formula, the steady-state yield formula and a matter balance equation, calculating the non-steady state yield of the volume fractured horizontal well of the shale gas reservoir by applying a continuous quasi-steady method; and repeating the previous step, and performing calculation to obtain the non-steady state yield of the volume fractured horizontal well of the shale gas reservoir. The method fully considers a process that a pressure is propagated to a boundary gradually in a production process of the volume fractured horizontal well of the shale gas reservoir, different seepage laws of shale gas in a volume transformation region and the non-transformed matrix region, and adsorption and desorption effects of the shale gas, so that actual conditions are better met.

The invention relates to a test method and a test device for obtaining saturated solubility and diffusion coefficients of a solid solute in a liquid phase simultaneously. According to solute mass conservation law and Archimedes law in the process of dissolution, a physical model in the process of dissolving the solid solute is established and mathematical description of the physical model is determined so as to establish an experiment characterization method and a measurement device. In the test method and the test device, the saturated solubility and the diffusion coefficients of the solid solute in the liquid phase at a certain temperature and under certain pressure are calculated from the measured real-time dissolved amount through a specific inversion model (physical and mathematical model). The test device has the advantages of simple operation, short measuring time and capability of measuring large quantity of data; and the solubility and the diffusion coefficients are obtained simultaneously, and the measured data can be verified mutually, so the measuring accuracy is improved and the data consistency is ensured well.

The invention provides a method for arranging network traffic flow detectors based on a road network topological relation. Firstly, road sections in a road network are divided into road network inlet road sections, road network outlet road sections and road network internal road sections, traffic generation road sections are determined, and the number of needed least detection road sections is the sum of the number of the road network inlet road sections and the number of traffic generation road sections; then according to the intersection traffic flow conservation law, a road network flow conservation equation set is built; then detection priority ordering is carried out according to road levels and costs, and the reversed order of the priority order is used as a detection weight; finally the highest priority of a detection road section set is used as an optimization target, a detector arranging optimization model is built with the number of arranged detectors and the order of a detector optimization coefficient matrix as restraint conditions, and the greedy algorithm is used for solving to determine the optimal arranging positions of the detectors. Construction and maintenance cost of a road network traffic flow detection system can be lowered, and OD matrix investigation high cost and distortion assumption of a traveler path choice motion are avoided.

The invention discloses a standard flow micro wind velocity calibration device which is characterized in that: a wind inlet port is a standard flow tube connected with a diverging rectification wind tube; the diverging rectification wind tube is connected with a standard air duct that is connected with a static pressure box; the static pressure box is connected with the suction inlet of a centrifugal fan by a hose; an inverter is connected with the motor of the centrifugal fan by an electrical wire; the standard flow tube is provided with a static pressure acquisition hole connected with a micropressure difference meter by a rubber tube; the standard air duct is provided with a wind velocity measuring hole, connected with the static pressure box by a flange and adopts a negative pressure manner to introduce air; the whole device is fixed on a wheelbarrow. According to the law of conservation of mass, the standard average wind velocity of the standard air duct can be calculated by standard flow and then tube axis wind velocity can be obtained by theoretical arithmetic according to the distribution and flow characteristic of flow in tubes and is taken as the wind velocity of a standard point. The device of the invention has the advantages of convenient operation, high precision, strong stability, stable adjustment velocity and convenient movement, etc.

The invention discloses a macrosegregation prediction method of a continuous casting slab. The method is characterized by including the following steps: step 1, establishing a macrosegregation model of continuous casting solidification to obtain solute concentration distribution and temperature distribution situations which are in the continuous casting slab and of not considering inclusion precipitation; step 2, introducing an inclusion precipitation calculation model to calculate and acquire an inclusion precipitation distribution situation in the casting slab, solute consumption amounts ofinclusion precipitation and the like according to an inclusion precipitation thermodynamics theory and a solute mass conservation law, and step 3, recalculating and correcting solute concentration distribution, which is calculated and obtained by the macrosegregation model of continuous casting, according to solute concentration after inclusion precipitation, and finally, predicting and acquiringsolute macrosegregation distribution which is in the continuous casting slab and of considering inclusion precipitation. The macrosegregation prediction method of the continuous casting slab of the invention has the advantages that costs are lower, efficiency is higher, and a solute macrosegregation distribution situation in the continuous casting slab can be more accurately predicted. A prediction result can be used for optimizing continuous casting technology and improving quality of the continuous casting slab.

The invention provides a regional-decomposition based coupling fast-calculation method for a high-precision DG (discontinuous Galerkin) and WENO (weighted essentially non-oscillatory) method to solve a hyperbolic conservation law equation and an Euler equation set. In the method, original problems are firstly subjected to regional decomposition, in other words, the structural or non-structural DG method is adopted in nearby regions of a physical boundary, and a finite element differential type WENO format under the structural grid is used in other regulation areas. During handling a regional coupling interface, two handling methods are adopted, and one is a conservative coupling handling method while the other one is a nonconservative coupling handling method. In the process of actual calculation, a bad unit indicator is used for judging whether decomposition nearby the interface is sufficiently smooth or not, if yes, the nonconservative coupling method is adopted at the position of the outer interface, and if not, the conservative coupling method is adopted.

A renewable energy electric power generating system consisting of Renewable Energy Wave Pumps, located under water, anchored to the sea bed, auto regulating to variable sea elevations and undulation heights, efficient, simple construction and resistant to storms, operate by using the law of conservation of energy to change, a large quantity of water at low head found in a surface undulation, into a lower water quantity at a much higher head, collecting this high head water into a piping network and a common header anchored to the sea bed, provided with a stand pipe and reservoir, and feeds directly into a hydro-turbo generator located on or off shore to produce renewable cheap electric power with zero emissions and independent of oil prices, optimizing land use for power plants, and providing a navigation-safe and a free Floating Break Water Structure for shore line protection

The invention discloses an ultrasonic condensing and separating device with multiple air inlet nozzles, which is mainly applied in the field of gas separation. Multiple air inlet nozzles are uniformly arranged in an air inlet cavity for making gas tangentially enter in a flow channel; the radius of the section of a contraction flow channel is reduced gradually, so that the rotational flow is enhanced according to the angular momentum conservation law, and huge centrifugal force is generated; a central body is arranged in the center of the flow channel, and constructs an annular contraction-expansion spray pipe with a variable sectional area together with a contraction section and a straight pipe section; a subsonic contraction flow channel, a throat part and a supersonic rotational flow separation flow channel are formed; after gas is accelerated to an ultrasonic speed, and low temperature and low pressure are formed, condensable components are condensed; at an ultrasonic rotational flow separation section, rotational flow separation of gas and liquid is realized by using huge centrifugal force; and the liquid enters a liquid accumulating cavity, and dry gas is collected in the center of the flow channel, enters a diffuser for returning pressure, and flows out. The device has the advantages of simple structure, no movable component, high processing accuracy, small occupied space, no need of adding any chemical medicament and support of unmanned operation, and is particularly suitable for use on offshore platforms.

The invention relates to a multi-colored tree anti-cold, anti-freezing and thermal-insulation coat which is provided with an outer cone colored layer made from thermal-insulation material, an inner cone self-colored layer made from thermal-insulation material and an interlayer that has even thickness and is made from thermal-insulation foam material. The interlayer is arranged between the outer colored layer and the inner self-colored layer. The coat is characterized in that: the upper external diameter and the lower external diameter of the cone are larger than the upper external diameter and the lower external diameter of a trunk requiring thermal-insulation so as to achieve the effects of being anti-cold, anti-freezing and thermal-insulation; an overlapping position larger than the trunk reserves length and width easy for sticking which are determined according to the height and width of the thermal-insulation coat; the coat has the advantages of good anti-cold, anti-freezing and thermal-insulation effects, convenient assembly and disassembly and use, beautiful appearance due to good matching of colors with the color of the tree, being capable of recycling, excellent environmental protection effect, low production cost, easy investment and production, wide application range, being applicable to various places needing thermal insulation for trees in different areas, meeting the requirements of industrial policy planning such as national forest conservation law and the like, low use cost and easy use and promotion.

A device with models constructed based on thermodynamics laws and fluid dynamics laws including the energy conservation law, momentum conservation law and mass conservation law. Compressor outflow flow rate calculation section calculates the flow rate of air that flows out of a compressor based on a relationship between an in-cylinder intake air flow rate during steady-state operation in an internal combustion engine system and supercharging pressure, which is pressure of air compressed by the compressor, and a value of the in-cylinder intake air flow rate calculated by in-cylinder intake air flow rate calculation section.

The invention discloses a magnetic levitation guide rail used for verifying momentum conservation law in high school physics, belonging to the technical field of high school physics experiment equipment. The magnetic levitation guide rail includes a base, the upper end of the base is fixedly connected with a fixed guide rail, the fixed guide rail is sleeved with a pair of sliding blocks matched with the fixed guide rail, the two sliders have the same mass, There is a gap between the stationary guide and the slider, the lower end of the fixed guide rail is fixedly connected with a pair of firstsuspension magnets, the slider is fixedly connected with a second suspension magnet matched with the first suspension magnet, the principle of magnetic levitation can be realized, The invention replaces the air cushion guide rail of the external air pump in the high school experiment, is simple in operation and convenient in handling, solves various complicated assembly steps of the air pump usedin the prior art to a great extent, eliminates various potential safety hazards, greatly improves the teaching efficiency of teachers, and facilitates students to learn knowledge through the experiment quickly and accurately.

The invention belongs to the nuclear power plant control technology field and especially relates to an active disturbance rejection control method used for fast reactor power and a coolant outlet temperature. The method comprises the following steps of establishing point reactor dynamic equation according to a neutron characteristic in a reactor, establishing the average temperature equation of afast reactor fuel and a coolant outlet temperature equation according to the law of conservation of macroscopic energy, and establishing the reaction equation of a control rod and a reactor overall reactivity equation; acquiring a fast reactor power and coolant outlet temperature second-order differential equation; designing an active disturbance rejection controller based on linear extended stateobserver; determining an extended state observer bandwidth range, and determining a PD bandwidth range by using deviation and executing mechanism motion speed allowing range; giving a coolant outlettemperature during the balance of a system and the fast reactor power during the balance of the system, carrying out LADRC parameter setting, acquiring a controller bandwidth and an observer bandwidth, determining a reactor power control system and a coolant outlet temperature control system, and completing active disturbance rejection control.

The embodiment of the invention discloses an establishment method and device of three-dimensional wake model, equipment and a storage medium. Firstly, prediction is performed based on a preset wake model and a mass conservation law; gaussian distribution of the wake flow wind speed at the initial vertical height is obtained; then a wind shear curve of an incoming flow wind speed is obtained; the rotation angle is calculated according to the wind shear curve; rotation correction is performed on the Gaussian distribution of the wake flow wind speed at the initial vertical height according to therotation angle; Gaussian distribution of wake flow wind speed with the corrected vertical height is obtained, then the wake flow speed of the horizontal plane is predicted to obtain Gaussian distribution of the wake flow wind speed of the horizontal plane, and finally a three-dimensional wake flow model is estqblished according to the Gaussian distribution of the wake flow wind speed with the corrected vertical height and the Gaussian distribution of the wake flow wind speed of the horizontal plane. The method for establishing the three-dimensional wake model provided by the embodiment of theinvention can improve the accuracy of predicting the wake area wind speed distribution by the wake model, and can be further applied to layout optimization and wind power prediction of a wind power plant.

The invention relates to a presentation device for angular momentum conservation, comprising a base, a main shaft rotationally installed on the base and a flexible assembly installed at the upper end of the main shaft, wherein a motor driving the main shaft to rotate and a detection processor detecting the angle speed of the main shaft are installed on the base; the flexible assembly comprises a flexible driver fixed at the upper end of the main shaft as well as an upper flexible end and a lower flexible end installed at the upper and lower ends of the flexible driver and movably sleeved on the main shaft, the upper end of the upper flexible end is fixedlyinstalled with an upper anchoring angle, an upper support arm is movably installed on the upper anchoring angle, the lower end of the lower flexible end is fixedly installed with a lower anchoring angle, a lower supporting arm is movably installed on the lower anchoring angle, the upper end of the lower supporting arm is hinged with the lower end of the upper supporting arm, and the lower end of the upper supporting arm is provided with a heavy ball. With rational structure design, simple structure and convenient use, the presentation device can help students know and understand angular momentum conservation rule, and the teaching demonstration of teachers are convenient.

The invention discloses a special-shaped blank design method for a high-temperature alloy F-type section ring. The special-shaped blank design method includes the steps: designing a blank according to an F-type ring volume distribution characteristic curve; setting equal overall heights of an ideal blank and the ring according to metal axial flow characteristics in the rolling process of the ring; determining the height between two steps according to the height of the corresponding step of the ring. A mathematical model is built according to selected rolling ratio and space conservation laws, and the radial size of the ideal blank is determined. The size of the ideal blank is simplified according to the volume splitting complementary principle. The size of a fillet in the blank is optimized according to section filling conditions obtained by finite element simulation, and the shape and the size of an actual blank are finally determined. By the method, the shortcoming of filling incompleteness in the rolling process of the F-type ring can be effectively overcome, production cost is saved while material utilization rate is increased, and damage of machining to the internal streamline of a forging is avoided.