197 results about "Mathematical simulation" patented technology

A semi-physical simulation testing system of moon soft-land guidance, navigation and control consists of a three-dimensional translation analog module, a three-dimensional turning analog module, a control computer, a simulation computer and a ground survey and master-control computer. The three-dimensional translation analog module and the three-dimensional turning analog module adopt a practicality modeling. Wherein, the three-dimensional translation analog module is used to imitate an orbit motion of a lander relative to the moon surface. A sand table of the moon surface is used to imitate ground features of the moon. The three-dimensional turning analog module is used to imitate an attitude motion of the lander. And other well-developed regular sensors, executing agencies, lander dynamics and kinematics can be replaced by accurate mathematical models built up by the computer. Compared with mathematical simulation, the system can make a GNC proposal and algorithm more effectively and truly verified. Compared with full-practicality analogue system, the system has advantages of low development costs and easy operation.

A test bench for testing a shield machine control system comprises a shield machine function simulation system and a sensing device arranged in the function simulation system, wherein the sensing device is communicated with the shield machine control system to be tested, and the function simulation system can be a physical simulation system, a mathematical simulation system or a combination of the physical simulation system and the mathematical simulation system. The test bench for testing the shield machine control system can completely simulate various functions of various types of shield machines, so as to test the correctness of the shield machine control system in design, assembly and debugging, avoid the risk arising from direct communication with the shield machine when the design of the control system is faulty, and shorten the circle of developing a new machine. Meanwhile, the invention is helpful for optimization and modification of the shield machine control system and remote fault diagnosis on the shield machine operated in a tunnel.

A force feedback and interactive system is provided in the present invention, wherein the force feedback and interactive system utilizes a mechanism for detecting weight or center of gravity and reacted force from an operator on a multi-axis motion platform, and a main controller which is a kernel of data processing and motion simulating of the multi-axis motion platform. Besides having complete mathematical simulation model for calculating reaction force variation according to the received operating command, force status and weight of the operator and having algorithm for simulating the motion of multi-axis motion platform so as to calculate the motion and instantaneous position of the multi-axis motion platform in space, the system can also provide function of force feedback for enhancing the virtual reality while being applied in various Human-Machine Interaction simulating field.

A system with automatic positioning controls for the holographic display of three-dimensional objects interacting in real time with objects of the real world. The person observing the screen (18) has the sensation that the objects are real, which is achieved thanks to a real time perspective correction system (1). The system is used in particular to simulate bowling pins (9). It is positioned on the lane required by means of a dolly (6). The system determines a relation between the information received from the sensors: video cameras (1) (3), dimensions (26), weight (14) (27) and the mathematical simulation models. When the ball is bowled, its physical features are measured and when it hits the pin deck, some holographic pins are displayed on the screen (19). The screen holographically arranges the projected objects over what the bowler (18) sees behind the screen (19). The simulated movements of the pins and the physical interactions with the real objects are determined by exploiting the theory of mechanics in three-dimensional space.

The invention discloses a system of satellite attitude control integrated simulation and an implement method. The system comprises a simulation computer and an interface expansion board; simulation application under five working modes of complete mathematical simulation, component-level semi-physical simulation, component-level semi-physical simulation, whole-spacecraft semi-physical simulation, satellite-ground united simulation and in orbit attitude visualization can be realized through the combining connection of the simulation system and tested hardware; the system integrates a number of functions in one set to reduce the repeated simulation software development work to achieve the universality and generalization of the simulation system; the visualization and operability of a simulation process is enhanced; the whole flow comparison simulation analysis from scheme design to in orbit test of the satellite attitude control system is supported.

The invention discloses a method for optimizing reliability and maintenance strategy of a piece of chemical refining equipment. The method comprises the following steps of collecting the historical testing and maintaining data of equipment inside a chemical refining device; carrying out the regression analysis by a failure distribution function for the historical data to obtain the characteristic parameters of the reliability and maintenance of single equipment; establishing a mathematical simulation model of system reliability of the chemical refining device, and collecting the relevant economic parameters of the device; carrying out the system simulation analysis for the chemical refining device by using the mathematical simulation model of system reliability, then obtaining the characteristics parameters of system reliability, usability and maintenance of the device, and then further obtaining the testing and maintaining scheme of the optimized system equipment, such as inspecting and maintaining order, frequency and cost; and obtaining the spare part stock scheme of the optimized system equipment, such as purchasing quantity, purchasing cycle and spare part stock, thus adjusting the equipment managing strategy of the device. The method for optimizing the reliability and maintenance strategy of the chemical refining equipment reduces the unplanned fault rate of the chemical refining equipment, and provides guarantee for long-period safety operation of the chemical refining equipment.

The invention discloses an electromagnetic environment analog simulation system of a radio fuse. A mathematical simulation calculation subsystem simulates and generates an electromagnetic environment echo model base according to a working environment, a test condition and actually measured data; an analog simulation control subsystem controls the working state of the radio fuse to be tested and collects the state parameter of the fuse and realizes controlling the simulation process of a semi-physical simulation device; the semi-physical simulation device converts the data of the electromagnetic environment echo model base into corresponding radio frequency echo signal so as to realize echo signal semi-physical closed feed simulation. The invention ensures the integrality and the uniformity of the system and has good expansibility and applicability; different electromagnetic environment analogs are realized through modifying software and models, the simulation flexibility and repeatability are greatly improved, and the invention has high environment applicability and good economic benefit.

The invention relates to a force analysis method of a single point buoy mooring system of an extra-large ship under the coupling action of stormy waves and provides a mooring force mathematical model suitable for a single point buoy anti-typhoon mooring system of the extra-large ship, which are used for performing identification modeling on a non-steady motion strained condition under a typhoon environment and performing a mathematical simulation test and actual measurement verification on the force motion of the ship without power and interference effects of the typhoon environment. Required input and output data are provided for the identification modeling of the mathematical model through a ship motion physical model test of a single point mooring ship model under the action of wind, currents and waves; and a mooring curve of a buoy type anti-typhoon single point mooring system is deduced and the influence of all component parts on the mooring curve is analyzed by researching a ship-buoy motion law based on catenary and cubic parabola theories, so that the key technical problem of the design of the single point buoy anti-typhoon mooring system is solved.

The invention relates to a structure design method of a free curved surface lens for outdoor LED (light-emitting diode) illumination, comprising three main steps: 1, analysis of an LED light source; 2, establishment of a light-emitting model; and 3, analysis of a mathematical model, wherein firstly, the LED light-emitting model is established by computer simulation and analysis of the energy distribution characteristic; then the corresponding relationship between the original transmission ray emitted by the light source and the modulated ray is determined to establish the mathematical model by taking the shape and the size of specific transmission light spots and the installation and distribution characteristics of the LED lamp as variants; finally, by combining with the actual engineering requirements, a dependent equation set is solved by adopting mathematical simulation software to obtain surface type space distribution point coordinate data, so that a free curved surface of a secondary light distribution lens meeting the engineering requirements is fit. In the structure design method, the conception is scientific, a secondary light distribution lens structure of a streetlamp meeting the requirements is designed, and uniform distribution of light energy is realized to a great degree. The structure design method has better practical value and a wide application prospect in the technical field of LED illumination applications.

The invention relates to a radio altimeter signal simulation system. The radio altimeter signal simulation system comprises a mathematical simulation calculation subsystem used for simulation to generate a model database required by simulation conditions and realizing conversion and management of the model database, and control and treatment of simulation process; an echo simulation subsystem which is connected with the mathematical simulation calculation subsystem, and is used for receiving model data and control instructions, and realizing conversion and output of model data into intermediate frequency signals; an altimeter equivalent unit which is connected with the echo simulation subsystem and the mathematical simulation calculation subsystem, and is used for simulating an actual altimeter, evaluating simulation capacity of the radio altimeter signal simulation system, and realizing retroconversion of signals into height values. The radio altimeter signal simulation system has flexible, economical, lifelike, and complex function simulation capacity, is capable of realizing real-time simulation operation and experimental verification of radio altimeters on total work environment, and is capable of providing support for testing experiments and performance evaluation of radio altimeters, and especially navigation control systems.

The invention relates to a control method for realizing an overload autopilot by using an accelerometer. The control method comprises the following steps of: firstly, calculating a functional relation between the attitude angular rate and the overload of a missile body under an inertial coordinate system; secondly, obtaining a damping circuit grain Kg and a stable circuit gain KA of the overload autopilot at a characteristic point of a missile track by adopting a root locus method of a classical control theory; and finally, constructing a damping circuit by using an accelerometer signal under the missile body coordinate system according to the result obtained in the first step and realizing the overload autopilot by using the accelerometer. According to the control method disclosed by the invention, aiming at the dynamic characteristic of a guide missile, by using the function relation between the overload and the angular rate and using a method of constructing the damping circuit by repeatedly using the accelerometer through the overload autopilot, the mathematical simulation validation can be carried out and a corresponding engineering realization scheme is provided.

The invention relates to a flexible mechanical arm control simulation platform and a working method thereof. The simulation platform comprises a flexible mechanical arm mathematical model, a simulation platform main interface, a control scheme selection and implementation module, a desired trajectory setting module, a control parameter setting module and a parameter status display module. A human-computer interaction interface of the simulation platform is designed by utilizing the GUI language of constructing a graphical interface, and a data interaction channel is established with a controlsimulation system based on Simulink. A user inputs various control parameters and model parameters of the simulation platform on the human-computer interaction interface, and clicks each function button to achieve parameter setting, mathematical simulation running and simulation image display.

The method relates to the field of hydraulic fracturing of subsurface formations. A mathematical simulation model of a pressure pulse propagation inside a wellbore and inside a fracture is created. Pressure pulses are sent to the wellbore, and the response of the well to the pressure pulses is registered. Then, a bottom-hole pressure corresponding to each pulse is determined. An average fracture width is derived by using the mathematical simulation model of pressure pulse propagation inside the wellbore and inside the fracture, and a ratio between the simulated average fracture width and the determined bottom-hole pressure is determined. The said ratio is extrapolated to a zero-width point, and the closure pressure is determined as the bottom-hole pressure corresponding to the zero width.

The invention discloses a DRX device based on an LTE system and a control method thereof, which belong to the field of mobile communication. The device comprises a service data buffer, a control module, an initial sleep interval calculation module and a sleep interval calculation module, wherein the control module is respectively connected with the service data buffer, the initial sleep interval calculation module and the sleep interval calculation module. The device and the control method thereof realize the variable exponential growth of a sleep period and determine the next initial sleep interval according to the state order of the former sleep mode. A mathematical simulation model is established according to an algorithm, the performance of which is analyzed in the aspects of energy consumption and time delay, and the result of the simulation shows that the improved device and the control method thereof have better performance. The device and the control method thereof has simple structure, low construction cost and stabile and reliable running.

The invention provides a method for carrying out visual simulation test on the dielectric loss of a current transformer. The method comprises the following steps of: by utilizing a visual reality technique, establishing a current transformer three-dimensional model, introducing a current transformer mathematical simulation model of the tested current transformer and establishing a corresponding relation of the current transformer three-dimensional model and the current transformer mathematical simulation model; by utilizing the visual reality technique, establishing an instrument three-dimensional model for detecting the tested current transformer, introducing an instrument mathematical simulation model of a current transformer dielectric loss test instrument and establishing a corresponding relation of the instrument three-dimensional model and the instrument mathematical simulation model; and operating a simulation system and calling the current transformer model and the instrument model to carry out visual simulation test. According to the technology provided by the invention, the accuracy and the working efficiency of the simulation test operation are improved, the visual requirement on the power system, which is increased day by day, is met, and the method has ultrahigh popularization value.

Provided is a switch reluctance motor memory inductor equivalent model. Two second-generation current transmitters AD844-U1 and AD844-U2, two operation amplifiers TL084-U3 and TL084-U4, and a multiplying unit AD633-U5 are used for forming a memory inductor which does not comprise a memristor passive two-terminal element, so that the switch reluctance motor equivalent model is quick in real simulation and control and can reflect the non-linear relationship of magnitude of phase currents and the position angles of a switch reluctance motor flux linkage and a rotor thereof in real time, quick direct mathematical simulation of a switch reluctance motor system can be achieved, important application value is achieved on real-time simulation and real-time control of a switch reluctance motor, and the switch reluctance motor memory inductor equivalent model can be effectively used for real-time simulation and real-time control of the switch reluctance motor. The equivalent model lays a solid foundation for real-time simulation and real-time control of the switch reluctance motor system and has wide application prospect.

The invention relates to an AODV protocol wireless intelligent network-based satellite attitude control simulation system. The satellite attitude control simulation system includes a physical simulation system and a mathematical simulation system; the mathematical simulation system is provided with an optical fiber gyroscope mathematical mode and a reaction flywheel mathematical model; the physical simulation system performs physical simulation of satellite pitching channel attitude control; the mathematical simulation system performs mathematical simulation of satellite rolling and yaw channel satellite control; the physical simulation system includes a single-axis air bearing table, wireless intelligent network nodes, a spaceborne computer, an optical fiber gyroscope, a reaction flywheel and a power source; and the optical fiber gyroscope, the spaceborne computer, the reaction flywheel and a simulation computer are respectively with one or a plurality of wireless intelligent network nodes and can communicate with each other through the wireless intelligent network nodes. The AODV protocol wireless intelligent network-based satellite attitude control simulation system of the invention has the advantages of high simulation flexibility, low cost and high implementation performance, and can improve the flexibility and the feasibility of a small satellite attitude control simulation test.

A computer-implemented system is disclosed for producing a design for a rotating machine assembly. It comprises a data module (10) configured for receiving data relating to one or more components of the rotating machine assembly; a user interface module (20 configured for specifying data to be received by the data module and for receiving from a user a type of analysis to be performed on the data; and an analysis module (30) configured for analysing a performance of the rotating machine assembly according to the type of analysis selected and selected features of the data to be used. It further includes a recognition module (40) configured for identifying and selected features of the data be used for the analysis according to the type of analysis selected. It provides an approach for managing and coordinating the data in the design of driveline systems so that the most accurate and informative insight on the driveline's performance is delivered to the engineer at the earliest possible point in the design process, hence product design and optimisation can be carried out as quickly and efficiently as possible. More aspects of product performance are coordinated together and the engineering insight is greater, hence the methodology becomes a platform for making engineering decisions rather than mathematical simulation.

The invention discloses a semi-physical simulation method and a simulation device for the aerodynamic effect in a high-altitude and high-speed environment. The method comprises the following steps: in a high-altitude and high-speed working environment of an airborne camera, pressure and temperature data of the surface of an optical window is calculated through a mathematical method, and the optimal thickness of the optical window is optimized; then, the pressure and temperature data and the optimal thickness of the optical window directly act on an aerodynamic effect physical simulation device, differential pressure and temperature adjustment is carried out directly on the surface of the optical window, and physical simulation experiment is carried out; and finally, feedback to a mathematical simulation model is formed based on the physical experiment result. By adjusting pressure and temperature systems of inside-cabin and outside-cabin environment simulation chambers, a differential pressure environment and a high-temperature environment are established on the surface of the optical window, and an aerodynamic effect caused by high-altitude and high-speed air flowing across the surface of the optical window is simulated. Scientific experiment basis and conditions are created for the ground research of the influence of aerodynamic pressure and aerodynamic heating effect in a high-altitude and high-speed environment on the performance of the optical window.

The invention discloses a semi-physical simulation synchronization evaluation system and method for a launch vehicle control system. The method comprises: S1, when a semi-physical simulation system is used for carrying out semi-physical simulation of a launch vehicle control system, a synchronization simulation system carries out mathematic simulation, output data of all links of semi-physical simulation and mathematic simulation are compared in real time, and the operation situation of the semi-physical simulation system is evaluated in real time based on the deviation situation of the output data to control operation or stopping of the simulation process; and S2, after testing, the output data of all links of semi-physical simulation and mathematical simulation during the whole period are analyzed to realize evaluation of the whole semi-physical simulation process. Therefore, real-time monitoring of the semi-physical simulation system can be realized; and reliability of the system can be improved.

An anti-blocking design method based on two-phase stream simulation for the drip irrigator features that according to the mathematical simulation about the two-phase stream in the flow field of said drip irrigator, the region in the flow channel, where the solid is easily deposited, is analyzed out and the influence of the flow channel structure to the delivery and deposition of solid is further analyzed. On this basis, the structure parameters of flow channel are modified and said simulation is repeated until no obvious deposition of solid.

The invention provides a semi-physical simulation method of an inertially stabilized platform control system. Pure mathematics simulation is real difficultly in the design of the inertially stabilized platform control system, the cost of real object experiments is high, and models are difficult to change. A digital model portion and a real object portion are used in the method, wherein the digital model portion is used for modeling detection feedback links of a kinetic model, a posture control law, revolving speed and an angular position of a stabilized platform and converting the detection feedback links into real-time procedures; a current value measured by the real object portion is corrected into output torque of an executing mechanism; the output torque is substituted into a digital model to obtain an armature voltage expected value of the next moment; the armature voltage expected value is transmitted to a hardware portion; and the real object portion comprises a controller, a driving circuit and a current detecting circuit. The problem that a real effect is difficult to achieve when mathematical simulation is carried out by the real object portion is solved. The semi-physical simulation method of the inertially stabilized platform control system has advantages of high instantaneity of the real object experiments, high degree of confidence and convenience, flexibility and economy in mathematical simulation. A design period of the inertially stabilized platform control system can be shortened, and the cost is reduced.

The invention relates to a rapid prototype design and semi-physical simulation method and system for a flight control system and belongs to the field of flight control. The rapid prototype design and semi-physical simulation system comprises a flight dynamic model operation module, a three-axis rotating table, an attitude sensor, a pressure conversion device, a pressure sensor, an analog computer, a lifting steering engine, an auxiliary wing steering engine, a direction steering engine and a balancing steering engine. By designing and building a prototype and semi-physical simulation system for the flight control system, flight control system design, mathematical simulation and a prototype system can be realized on the basis of the model, performance testing and software verification carried out on the flight control system can be finished in real time through semi-physical simulation, and integration of flight control system design, mathematical simulation, the prototype system and semi-physical simulation can be realized.

The invention discloses a top drive simulation system and a method. The simulation system comprises top drive simulation operation equipment, a PLC (programmable logic controller) and a control unit, wherein the control unit comprises a main control machine, a parameter machine and a graph processing machine; the top drive operation equipment is connected with the PLC; the PLC is connected with the parameter machine through a serial port, and the parameter machine and the graph processing machine are respectively connected with the main control machine through a communication network. The simulation method comprises the following steps that S1, switch and knob state data are collected; S2, the data are sent to the main control machine; S3, the main control machine carries out calculation; S4, virtual showing is carried out. The invention provides the top drive simulation system and the method. The system has the advantages that the occupied ground is small, the maintenance cost is low, the damage cannot easily occur, the full-dimension and full-physical operation environment can be provided, the strict underground mathematical simulation is adopted, so the system and the method conform to the real process requirements, and meanwhile, the system has the top drive work principle 3D (3-dimensional) animation display function, so that trainees can better understand the top drive work principle and a wearing part maintenance method.

The invention discloses a magnetic survey microsatellite attitude determination method based on a simplified self-adaptive filter, comprising the following steps of: firstly, establishing a satellite attitude motion model; secondly, improving a magnetometer measurement model; thirdly, measuring the self-adaptive correction of a noise model; and fourthly, calculating the filter. The invention simplifies the calculation on a filter grain array on the basis of analyzing and improving the magnetometer measurement model. Under the condition of not obviously influencing precision, the invention remarkably lowers the calculation amount; mathematical simulation indicates that the algorithm is effective; and a three axis magnetometer attitude scheme can meet the requirement for moderate attitude precision. The invention has favorable engineering significance and application potential.

The invention relates to a method for representing the component and isotope fractionation effect in the natural gas adsorption and desorption process of shale and belongs to the technical field of instruments used for analyzing materials by aid of measuring physical properties of the materials. The problem that in the prior art, due to the fact that a large amount of gas is lost in the drilling and sampling process, the experiment result cannot completely reflect the desorption process of shale gas is solved. According to the method, a competitive adsorption experiment is carried out in the shale gas adsorption and desorption process under high temperature and high pressure conditions, qualitative analysis is conducted on component fractionation in the process, qualitative analysis is conducted on isotope fractionation, and meanwhile a Langmuir model and an adsorption model are adopted for conducting numerical simulation on the adsorption quantity and the isotope value. Thus, elaborate description of the competitive adsorption effect in the shale gas adsorption and desorption process is realized, and it is beneficial for guiding gas-driven exploitation of the shale gas. The method can be widely applied to mathematical simulation research, gas-driven exploitation of the shale gas and other occasions.

An earth-boring system for generating a fluid flow model of a borehole may include a drill string, and a model generation system. The model generation system may include a memory device and a processor. The memory device may store a plurality of mathematical simulations of a borehole. The processor may receive real-time operational data, analyze the real-time operational data via one or more of the mathematical simulations, identify a mathematical simulation that most closely matches the real-time operational data, and generate a simplified mathematical fluid flow model utilizing both the mathematical simulation and the real-time operational data.

The invention discloses a comprehensive test system of failure satellite control in space. The comprehensive test system comprises a central control unit, a measurement and control unit, a motion andenvironment simulation unit, a control mechanical arm unit, a remote operation unit and a scene simulation unit, wherein the measurement and control unit is a central link of each unit information interaction, the central control unit is used for developing and downloading a dynamics and control and control model of the space failure target operation, and data storage and monitoring are carried out in the simulation process; and the measurement and control unit is used for operating various dynamics and control software, data acquisition and processing software and measurement and control software, and completing the real-time generation and transmission of the control instructions; the motion and environment simulation unit is used for simulating the motion of a serving satellite and a target satellite in the space; the control mechanical arm unit is used for simulating the space capture of the failure target satellite; the remote operation unit is used for controlling an operation platform and mechanical arms to move through remote operation to complete a specified task; and the scene simulation unit is used for driving a scene model according to the mathematical simulation and the actually-measured data to reproduce a spatial operation process.

In order to overcome the problem that the current theory is not very capable of perceiving battlefields, the invention provides a method for assisting battlefields to perceive by a computer and fulfills the accuracy of the method process of assisting battlefields to perceive by the computer. The battlefield environment simulation refers to the description of battlefield environment through the simulation technique. Simulation refers to the study of an existing system or a system in design through the experiment of a system module. Computer simulation (also called mathematical simulation) refers to that the system module is applied to doing experiment on a real system or a system in design by the assistance of a computer so as to fulfill the purpose of analyzing, researching and designing the system. The system hereby refers to an organic integrity of a group of several factors which have specific functions and mutual connection for a certain purpose. The simulation of a system relates to three factors: a system, a system module and a computer, and the basic action linking the three factors are module building, simulation module building and simulation experiment.

The invention relates to a method for the continuous casting of a metal strand in a continuous casting plant, a strand being withdrawn from an in-line die, supported in a strand support unit, cooled by a coolant and optionally metallurgically reduced, thermodynamic changes in the entire strand being calculated in a mathematical model containing a thermal conduction equation. The aim of the invention is to provide a method which can be used to improve the product quality of a metal strand, for example by reducing the porosity and / or liquation and by improving the surface quality and form stability. Said aim is achieved by a method, according to which the natural shrinkage of the strand is calculated in real time in the mathematical simulation model, taking into consideration the physical parameters of the metal, the temperature in the casting distributor, the frequently measured withdrawal speed, the cooling of the strand and the thickness of the strand and strand guide rollers of the strand support unit, said rollers being placed against the strand, are set by taking into consideration the natural shrinkage of the metal strand.