21 results about "Simulation methods" patented technology

The invention provides an OpenStack based software defined network simulation system. The system comprises a virtual machine creating module, a simulation network setting module and a test module, wherein the virtual machine creating module creates multiple virtual machines according to requirements, the simulation network setting module arranges at least one software defined network controller and at least one software defined network switch in the created virtual machines according to requirements so as to establish a corresponding network topology network, and the test module tests whether the arranged software defined network controller and software defined network switch satisfy requirements according to the established network topology structure. The system uses the test module to test whether the arranged software defined network controller and software defined network switch satisfy requirements, so that the needed controller and switch can be developed according to requirements, the setting flexibility of the software defined network is improved, and the design cost is reduced. The invention also provides a software defined network simulation method.

The invention belongs to numerical simulation of discharge of a Tokamak device in the field of magnetic confinement controlled nuclear fusion, and relates to a simulation method for controlling a newclassic tearing mode through resonance magnetic disturbance in Tokamak. According to the current data in the Tokamak upper coil assembly, the Biot-Savart law is used for solving an induced magnetic field; integrating is performed to obtain an expression of a polar magnetic flux corresponding to the induced magnetic field according to approximation of a large ring diameter ratio; a Fourier transform pseudo-spectrum method is utilized to transform magnetic flux into components of different moduli to obtain three-dimensional distribution of the components in a tokamak median form, the three-dimensional distribution is coupled into a magnetofluid equation, and the Crank-Nicosolson method is utilized to solve the evolution of the magnetic field with the resonance magnetic disturbance along with time, so that the influence of the magnetic field on the new classical tearing mode is studied. The method can simulate the physical processes of new classic mode locking, inhibition, field penetration and the like of the tearing mode, is high in calculation efficiency and relatively good in numerical stability, and is an efficient numerical method capable of accurately simulating an experiment.

The invention discloses a crowd behavior simulation method and a crowd behavior simulation system guided by a safety evacuation mark. The method comprises the following steps of: creating a three-dimensional building model of a scene to be simulated; determining the quantity and the position of the exit corresponding to the scene to be simulated in the three-dimensional building model; marking thelocation of safety evacuation signs corresponding to the scene to be simulated in the three-dimensional building model; according to the number of exits, the location of exits and the location of safety evacuation signs, the road markers in the three-dimensional building model being set in advance, and then PRM algorithm being used to generate all the available evacuation paths, and the paths inthe planning direction of safety exit being marked as one-way paths, paths beyond the planning direction of the safe exit being marked as one-way paths to the outbound exit; importing characteristic data of initializing evacuation crowd; a Dijkstra algorithm being used to find the shortest escape path from the one-way path for the evacuated individuals; in the process of crowd evacuation, an RVO obstacle avoidance strategy being used to simulate crowd evacuation.

Embodiments of the disclosure relate to a test simulation method and apparatus, a computer storage medium, and an electronic device. In the embodiments of the disclosure, a feedback result of a firstcontroller is collected, the position change amount of a vehicle is determined according to the feedback result and the corresponding position update is performed. In this way, the corresponding testprocess can be completed only on a specific platform, without requiring a vehicle under test to actually travel on the road.

The invention provides a partitioned simulation method for a nuclear power unit condenser. The method comprises the steps of (1), partitioning simulation objects, wherein the simulation objects comprise general condensers and shared condensers, and partitioning comprises uniform partitioning and non-uniform partitioning; (2), inputting structure sizes, physical properties, boundary parameters and calculation initial values of the condensers; (3), carrying out thermal-transfer calculation on one-to-one correspondence partitions at a shell side and a pipe side; (4), carrying out thermal parameter calculation; and (5), outputting a simulation result. Compared with an actual device, the simulation model established by the method has the advantages that the output data under steady state and transient state condition can satisfy a device simulation precision demand, and the operation characteristic research can be carried out through utilization of the simulation method.

The invention belongs to the technical field of analogue integrated circuits and particularly relates to an error amplifier used for a switching power supply. According to the error amplifier, a circuit structure of turning-back output under-voltage protection is additionally arranged in a high-voltage clamping circuit; based on a feedback principle, the output range of the error amplifier is limited through a simulation method, and therefore a system is more stable; the situation that for a traditional structure, a long-time adjusting process is needed is avoided, and the functions of output short circuit protection and power-on stable starting are achieved. The error amplifier is especially suitable for the switching power supply.

The invention provides an environment simulation test case and an environment simulation method. The environment simulation test case comprises a case body forming a work cavity inside, a heat exchanging device communicated with the work cavity via an air inlet and an air outlet to change the temperature of the work cavity, a vacuum generation device communicated with the work cavity via a pumping port to reduce air pressure of the work cavity, an ozone generation device communicated with the work cavity via an ozone outlet to provide ozone air to the work cavity, and a sample installation bench and a ultraviolet radiation lamp set both disposed in the work cavity, wherein samples can be placed on the sample installation bench; and the ultraviolet radiation lamp set can illuminate the sample. The environment simulation test can meet demands for reliability test for near space aerocrafts indoor.

The invention is applicable to the field of data processing, and provides a method for simulating drill beam assembly, a system and equipment thereof. The method comprises the following steps: establishing a beam model according to stored model data; analyzing precision and verticality of a guide way mounting surface of the beam model according to stored model material, working temperature and an analysis parameter so as to obtain an analysis result; determining that whether the analysis result meets a stored design objective or not; modifying the stored analysis parameter and/or the model data according to the analysis result, when the analysis result does not meet the stored design objective. In the invention, the method for simulating the drill beam assembly can be realized by analyzing the precision and the verticality of the guide way mounting surface of the beam model, and modifying the stored analysis parameter and the model data according to the analysis result. The method can discover and solve problems as early as possible before manufacturing a sample, thereby improving product quality, shortening development period, and reducing cost.

The invention discloses a stochastic production simulation method of combined heat and power of an integrated energy system, Installations and equipment, Considering that energy sources other than power units, such as renewable energy, can also have an impact on integrated energy systems. At first, that net power sequential load data is separated from the power sequential load data, according to the net power sequential load data and the heat load data, the initial joint probability density function of thermoelectricity is constructed, to ensure the accuracy of the initial thermoelectric jointprobability density function, by simulating the operation of the unit in the integrated energy system, according to the unit performance index, the initial combined thermoelectric probability densityfunction is modified to obtain the equivalent combined thermoelectric probability density function, Finally, the reliability index and economic index of the integrated energy system calculated by theequivalent thermoelectric joint probability density function are more consistent with the characteristics of multi-energy coordination and coexistence of the integrated energy system, and the accurate evaluation of the reliability and economic value of the integrated energy system is realized.

The invention relates to the technical field of experiment equipment for an environment engineering laboratory and particularly relates to a laboratory drainpipe network simulation system and a simulation method. A water storage device of the system is connected with a spraying device and supplies quantitative water for the spraying device, the spraying device sprays water to an experiment table arranged below the spraying device, the experiment table is used for simulating a distribution structure of a road drainpipe network and comprises at least two experiment zones, adjustable height difference exists among the experiment zones, the experiment zones are communicated with the water storage device through a water drainage device to return rainwater dropping onto the experiment table to the water storage device through the water drainage device, and a controller is respectively connected with the water storage device, the spraying device, the experiment table and the water drainage device, is used for controlling opening/closing, position adjustment and water flows of the water storage device, the spraying device, the experiment table and the water drainage device and can simulate operation states of underground drainpipe networks with different rain intensities and different surface differences.

A technique for enhancing the execution efficiency of simulation of a hybrid system. A continuous system simulator receives a request for evaluation of an event generating conditional expression for an event to be processed by a discrete system simulator, from the discrete system simulator. The event generating conditional expression is evaluated by referring to the value of a first variable describing a continuous system. Until evaluation of the event generating conditional expression indicates true, the continuous system simulator repeats simulation of advancing the current time by a step time interval and evaluation of the event generating conditional expression. When evaluation of the event generating conditional expression indicates true, the continuous system simulator sends current time data and the value of a second variable describing the continuous system which is referred to by the discrete simulator, to the discrete simulator.

The invention provides a key simulation method, a double-screen terminal and a computer readable storage medium. The key simulation method comprises the steps of obtaining a role of a display screen,facing a user currently, of the double-screen terminal; when it is determined that the display screen facing the user is a second display screen, the function type of a preset entity key on the outerside of the double-screen terminal is obtained; wherein the setting position of the entity key is suitable for a terminal operation habit of a user when the first display screen faces the user; and simulating a virtual key of which the function type is the same as that of the entity key on the other side opposite to the outer side where the entity key is located. When the double-screen terminal isin a non-conventional use posture, the double-screen terminal is in a non-conventional use posture; and according to the setting position of the entity key, the opposite side of the terminal is provided. Compared with the prior art, the virtual key with the function the same as that of the entity key is simulated according to the operation position of the double-screen terminal, so that the usercan control the terminal through the same operation position under two different use postures of the double-screen terminal, the development of terminal operation habits of the user is facilitated, the operation accuracy and convenience are improved, and the user experience is improved.

The invention discloses a charging demand calculation method for an electric automobile. The method includes the following steps: 1) describing a changing condition of a state of charge of a power battery of the electric automobile during a one-day trip process of a user through a Markov chain; 2) considering the influence of a time-consuming coefficient corresponding to a traffic index on the driving time and the probability of the trip time of the electric automobile at each time period corresponding to each of destinations during the trip process of the user, and determining a distributioncondition of the charging demand at each time of one day; and 3) obtaining time and spatial distribution of the charging demand of the electric automobile by using a Monte Carlo simulation method. Themethod considers the influence of the traffic time-consuming coefficient on the driving process of the electric automobile, and can more accurately reflect the spatial-temporal distribution of the charging demand.

A 5G millimeter wave power amplifier linearization simulation method is disclosed, which exhibits universality. When a digital predistortion algorithm adopted by engineers or researchers is not suitable for the power amplifier model or some parameters in the digital predistortion algorithm are unreasonable, the simulation results of power amplifier circuit in ADS will directly and concretely get the result that the linearity is not improved or even deteriorated. By using ADS and MATLAB, the invention helps engineers to check the capability of the designed power splitting amplifier and the corresponding digital predistortion algorithm, and helps them to optimize the digital predistortion algorithm.

The invention provides a bus information extraction device of a rudder system in a loop and a semi-physical simulation method. The extraction device comprises an industrial personal computer, a 1553Bbus acquisition and optical fiber transmission interface board, a matched cable and an optical fiber; the industrial personal computer and the 1553B bus acquisition and optical fiber transmission interface board are jointly accessed into a CPCI/PCI bus; the 1553B bus acquisition and optical fiber transmission interface board is used for connecting the bus information extraction device into a 1553Bbus in a bus monitor mode through a matched cable; the 1553B bus is connected with a plurality of RT terminals including a rudder system and a guidance machine, and the 1553B bus acquisition and optical fiber transmission interface board is connected with the simulation system through an optical fiber. According to the invention, via the control of the FPGA transmission scheduling control module,the real-time rapid extraction and synchronous conversion of 1553B bus information can be realized and transmitted to an optical fiber network; the invention is small in time delay and stable in frame period, and solves the problems that the existing master-slave 1553B bus interface computer software is large in data acquisition and forwarding time delay and easily causes divergence of a simulation test.

The invention discloses a GIS equipment temperature field reduced-order rapid simulation method and device, and the method comprises the following steps: S1, building a three-dimensional geometric simulation model of an inspection object according to the physical structure of the inspection object, performing multi-group working condition simulation on the established three-dimensional simulation model by utilizing finite element simulation software to obtain multi-group three-dimensional temperature field simulation analysis results; s2, according to the established three-dimensional geometric simulation model and the temperature field three-dimensional simulation result, extracting the temperature field three-dimensional simulation result as a temperature field one-dimensional data set through feature point extraction and temperature information data association on feature points; and S3, different input conditions are changed, simulation is carried out through the step S1, a training sample library is constructed according to the corresponding input one-dimensional data set and the corresponding temperature field one-dimensional data set obtained through extraction in the step S2, a training model is constructed, learning is carried out through machine learning software by utilizing samples of the training sample library, and a reduced-order model is generated.

The invention discloses an integrated energy system event-driven simulation method based on a decomposition method, and belongs to the field of energy system simulation. The integrated energy system event-driven simulation method based on the decomposition method comprises: S1, establishing an electric, gas and heat energy network model and an equipment model; S2, establishing an integrated energy system model, and dividing the model into different modules according to the energy network type and the equipment characteristics; and S3, obtaining system parameters, system normal state loads and system fault conditions, determining a solving sequence of each module according to different fault types, independently solving the module, and transmitting parameters to the next module until the system is solved. According to the method, the characteristics of strong coupling of the integrated energy system and frequent parameter interaction between equipment and networks in dynamic simulation are fully considered, the whole system is divided into different modules by adopting a decomposition method, the solving sequence of the modules is determined according to different fault positions, an event-driven simulation strategy is realized, and the simulation efficiency is effectively improved.