88 results about "Continuous simulation" patented technology

A method and apparatus wherein complex physical interactions and collisions are modeled at a high level of detail while reducing the computational demands placed on the processing system. In one embodiment the method comprising the steps of defining a first object and a second object, each object adapted for colliding with the other object; assigning an interaction type for at least one of the first and second object in response to an object parameter; and selecting between a continuous simulation of a collision and a discrete simulation of the collision in response to the interaction type.

System and method for managing a biofuel production process. An integrated dynamic multivariate predictive model is provided that includes a continuous process model representing a continuous process of the biofuel production process, a batch process model representing a batch process of the biofuel production process, and a continuous simulation framework. The batch process model interacts with the continuous process model as a nonlinear continuous process via the framework using bridging equations. An objective is received, as is constraint information specifying constraints for the biofuel production process, where the constraints are in terms of the framework, and process information related to the batch and continuous processes. The integrated model is executed per the objective using the process information as input, generating target values for variables related to the batch and continuous processes per the objective and subject to the constraints, and used to control the batch and continuous processes substantially optimally.

A system is disclosed that provides a distributed continuous simulation of a three dimensional simulation space. The simulation space is partitioned into a set of regions. The system includes a set of simulation servers. In one embodiment, each simulation server is responsible for simulating one of the regions of the simulation space. Users interacting with the simulation communicate directly with the simulation server responsible for simulating the region that the user is currently interacting with.

The invention discloses an urban rainstorm waterlogging assessment and modeling method. The method comprises the steps that an urban earth's surface runoff producing model is established, a time-integration method is adopted to calculate accumulated infiltration and accumulated produced runoff at a moment t, wherein t represents rainfall time; according to the calculated accumulated infiltration and accumulated produced runoff at the moment t, hour-by-hour continuous simulation is conducted on a ponding zone and ponding depth of rainstorm waterlogging by obtaining the rainfall capacity hour by hour and utilizing an equal-volume method, and an urban earth's surface confluence model is established to obtain urban rainstorm waterlogging simulation result at corresponding moment. The time-integration method is adopted to respectively process a water permeable zone and a water non-permeable zone, hour-by-hour continuous simulation can be performed by inputting hour-by-hour rainfall capacities, and real-time forecasting and estimation of the rainstorm waterlogging are achieved through butt joint with rainfall forecasting. According to the method, the whole urban waterlogging and water receding process is considered, and hour-by-hour elaborate simulation of urban waterlogging can be achieved, so that real-time operation influencing the model in forecasting becomes possible.

The invention discloses a finite-element-based machine tool important part residual stress multi-process continuous modeling simulation method. The method comprises the steps of important part model simplification and casting system three-dimensional modeling, important part casting process finite element simulation, important part casting stress field coefficient correction, important part machining residual stress simulation, and important part thermal aging process residual stress finite element simulation. Accordingly, multi-process continuous simulation of casting, cutting and thermal aging processes are implemented; a blind hole method test measurement value serves as a reference, a stress value of an important part casting simulation corresponding point is extracted, a test value ofthe corresponding point and a correction coefficient with the minimum simulation value error are fitted by applying a least square method through MATLAB, and then the whole casting stress field datais corrected; the calculation accuracy of finite element simulation is improved, and the technical purpose that the casting stress field obtained after a beam is corrected is guided into an ABAQUS accurately is achieved.

The invention discloses a multi-unmanned aerial vehicle cooperative air combat maneuver decision-making method based on multi-agent reinforcement learning. The problem of autonomous decision-making of maneuver actions in multi-unmanned aerial vehicle cooperative air combat in simulation of many-to-many air combat is solved. The method comprises the following steps: creating a motion model of an unmanned aerial vehicle platform; analyzing a state space, an action space and a reward value of a multi-machine air combat maneuvering decision based on multi-machine air combat situation assessment of an attack area, a distance and an angle factor; designing a target distribution method and a strategy coordination mechanism in a collaborative air combat, defining behavior feedback of each unmanned aerial vehicle in target distribution, situation advantages and safe collision avoidance through distribution of reward values, and achieving strategy coordination after training. According to the method, the ability of multiple unmanned aerial vehicles to carry out collaborative air combat maneuvering autonomous decision making can be effectively improved, higher collaboration and autonomous optimization are achieved, and the decision making level of unmanned aerial vehicle formation in continuous simulation and learning is continuously improved.

A driver fatigue realtime detection method based on the vision, belongs to the application technical field of the electronic technology, characterized in that, the continuous simulation signals through the infrared filter collected by the pick-up head are converted into the digital image signals through the A / D conversion of the image collection module; the image collection module completes the operating process on the digital image signals, including the pretreatment of the image, the image division, the feature extraction and the fatigue recognition; finally the processing result is displayed through the output module. The hardware in divided into three large modules: an image collection module, an image process module and an image output module. The image collection module includes an infrared sensitive black and white CCD camera, an infrared band-pass filter, an infrared source with a cradle head; the image process module is composed of the TMS320DM642 of the American TI company as the central part; the image output module is a LCD; the system is arranged in the inner of the cab. The invention has the advantages of easy realization, good realtime, higher accuracy of the judgment result, which provides the basis for the real application.

The invention discloses a power distribution network reliability evaluation method considering an opportunity maintenance strategy. The power distribution network reliability evaluation method includes the steps of 1, subjecting fault rates and reliability of power distribution network elements to modeling; 2, analyzing all maintenance modes of a power distribution network, recording blackout influence of each maintenance mode on each load point, and forming a report; 3, setting initial simulation data; 4, generating N uniformly-distributed random numbers within an interval (0, 1), and acquiring N non-fault operation times according to a fault parameter lambda in each element state model; 5, seeking the minimal non-fault operation time; 6, calculating reliability R(tR) of each element at a moment t; 7; if t<TTFi and R(tR)>Rp, executing a step 8, and if t> / =TTFi or Rj(tRj)< / =Rp, subjecting an element i to fault maintenance or subjecting an element j to preventive maintenance; 8, subjecting the simulation step to addition by 1, namely K=k+1, and if K<Kmax, and a reliability clock tR=tR+H, returning back to the step 4 for continuous simulation; if K> / =Kmax, executing a step 9; 9, ending a simulating process and calculating a reliability index of the power distribution network according to formula (4) to formula (11). The power distribution network reliability evaluation method considering the opportunity maintenance strategy has the advantage that influence of the opportunity maintenance strategy on the reliability of the power distribution network can be evaluated precisely.

The invention discloses a guided missile pitching channel simple sliding-mode control method based on overload and angular velocity measurement. The method comprises the steps of processing overload signal and angular velocity signal measurement and amplitude limiting; establishing an integral sliding-mode face and selecting simplified sliding-mode control law parameters; performing continuous simulation verification on a simplified missile body model; performing robustness checkout and parameter adjustment under aerodynamic parameter perturbation. The guided missile pitching channel simple sliding-mode control method is a simple sliding-mode control method based on a gyroscope measurement attitude angle and rate gyroscope measurement guided missile attitude angular velocity technology, enables control parameter adjustment and selection to be simple and concise compared with similar control methods. The guided missile pitching channel simple sliding-mode control method is simple in control law composition and good in control low robustness, does not rely on accurate model information and has not high requirements for the overload measurement accuracy, angular velocity measurement accuracy and an on-missile computer sampling period.

The invention discloses a resonant optical gyroscope simulation method, comprising steps of 1) initializing a global time signal required by simulation; 2) providing the global time signal in the step 1) to various data signals on a computer simulation platform; 3) setting parameters involved in data signal process in the simulation task; 4) setting a simulation time length of simulation system; 5) starting system simulation to process signals; 6) observing and storing simulation results; 7) analyzing simulation result in the step 6) 8) changing simulation parameters for continuous simulation or simulation realized. The invention uniforms optical process and electrooptical process in resonant optical gyroscope by packaging optical and electric apparatus as modules, which greatly reduces work load of constructing system during simulation and overcomes problem that traditional method can not reproduce various optical phenomena. The optical noise is described by compute language and influence of optical noise in simulation is added, which enhances process of optical noise.

The invention relates to an unmanned plane cluster cooperation patrol tracking locus programming method based on an upper limit confidence interval algorithm; the method comprises the following steps: inputting a patrol area, an unmanned plane number and a gas station position; building a target probability model; using the upper limit confidence interval algorithm to solve the next motion direction of the unmanned planes, i.e., randomly selecting a motion direction, using a team mate model to predict a team mate motion direction, obtaining present step bonus and updating the target probability model; selecting the most worthy trying next direction for continuous simulation when the simulation step reaches the maximum simulation duration, continuously simulating until reaching the maximum simulation time, and selecting the direction with the highest average bonus as the unmanned plane real motion direction; allowing the unmanned plane to update the team mate model according to the team mate real motion direction and the maximum probability direction after each decision. The method can adjust according to the unmanned plane hardware performances, is good in robustness, can automatically refuel, patrol and track, and can be widely applied to the unmanned plane automation area patrol and tracking fields.

The invention relates to an air floating platform with follow-up cable tables, belonging to the technical field of simulation testing equipment of spacecrafts and solving the problem that the existing air floating platform runs for a short time due to the limited capacity of an air supplying high pressure gas cylinder. The air floating platform comprises five parts, namely, air flotation, measurement, follow-up cable tables, an object stage and an upper computer, wherein all parts on a base are in air flotation state, the two follow-up cable tables are used for providing interfaces for an external gas circuit and an external circuit, so as to guarantee the continuous simulation work without limitation to running time, two position sensors are respectively used for detecting relative position relationship between two parts, the upper computer controls air injection of the nozzle of each part so as to keep the equipment synchronization. The air floating platform is the simulation testing air flotation platform of the spacecraft.

The invention relates to an integral dropper vibration fatigue tester, comprising a rack and a body in the rack, wherein the rack comprises a main rack and a dragging rack fixed above the main rack; the body comprises an installation base plate, a driving device fixed to the dragging rack and a plurality of test units fixed between the dragging rack and the installation base plate. The integral dropper vibration fatigue tester can simulate running condition of the integral dropper and realize continuous simulation of vibration test.

The invention relates to a multi-channel multi-target satellite-borne AIS (Automatic Identification System) reconnaissance signal simulation system, and is a system for simulating a multi-target aliasing dynamic AIS signal received when a satellite-borne AIS multi-channel reconnaissance system carries out in-orbit operation. All filtering and frequency conversion of four channels of AIS signals and two paths of signals generated by the system can be subjected to all-digital calculation, interchannel consistency is good, signal straying is small, and a harmonic component is good; a clock sampling rate is high, the time resolution of the generated AIS signal is high, and the control accuracy of time delay can achieve about a 8us order of magnitude; a quantity of AIS targets which can be generated is large, continuous simulation time is long (which is longer than five minutes), and any scene of 0-10000 ships in the same field of view can be simulated. By use of the system, a purpose that the dynamic-change multi-target aliasing AIS radio frequency signal which receives Doppler frequency shift, amplitude fluctuation and the like caused by relative movement during satellite-borne reconnaissance can be vividly generated is realized.

The invention discloses a temperature control method for a heating furnace based on a heat accumulating type nozzle. When the flow of air and gas is larger than that of a balance point, a continuous simulation control mode is adopted for controlling; when the flow of air and gas is smaller than that of the balance point, the adopted continuous simulation control is stopped; burning and stopping controls are carried out on partial nozzles in the heating furnace; the heating furnace is roughly adjusted to the temperature 30 DEG C lower than a set temperature, heating is carried out by reutilizing the continuous simulation control mode to the set temperature while the gas flow starts to be increased based on PID adjustment, and a stable feedback control state is realized. The method provided by the invention can adapt to the temperature control requirements of the heating furnace based on the heat accumulating type nozzle, utilize an organic DCS system to perform digital discrete control programming, make full use of the original system, and save investment, thus having good application and promotion prospects.

The invention discloses a multi-infeed power transmission system fault partition current limiter installation method based on a graph theory. The method comprises the steps that an alternating-current network with a direct-current drop point is extracted to be a graph, all generatrices form a vertex set of the graph, and all alternating-current lines form a frontier set of the graph. Two weights w1 and w2 are given to each edge of the graph and correspond to a relative value of a tide mode and a serial number of the edge; sorting is performed according to the size of all the weights w1, and fault current limiters are installed on the edges with the w1 larger than 1 for grouping. A direct-current system inversion side extinction angle is used as the judgment standard, and step-by-step optimization is performed through a continuous simulation method to obtain the minimum current limiter combination meeting the requirement. According to the method, power grid partitioning and fault isolation can be effectively achieved after a fault occurs, it is ensured that no simultaneous commutation failure occurs on a multi-infeed power transmission system, and the effectiveness of the method is verified.

The invention provides a navigation information simulation system for a tunnel. The system comprises at least one satellite signal simulator for generating an artificial navigation signal and transmitting the signal to a target train through a leaky cable, and an integrated control system which is used for sending a start simulation command, ephemeris information and real-time time to the at leastone satellite signal simulator through a fiber optic cable, wherein two adjacent satellite signal simulators are connected through a fiber optic cable group. The continuous simulation of navigation and positioning is carried out in the tunnel, and therefore, the problems of positioning result loss and time discontinuity of the train in the tunnel can be solved with low cost.

The invention provides a cobalt-indium bimetal loaded mordenite catalyst used for catalytic decomposition of nitrous oxide and a preparation method thereof. Under the circumstances of a space velocity of 30,000h<-1>, a reaction temperature of 400-500DEG C, an N2O concentration of 0.1-30%, an H2O content of 2-10%, the catalyst can decompose most or all of N2O in a pollutant discharge system into N2 and O2. With high stability, the catalyst does not weaken in activity after a continuous simulation of nitric acid plant tail gas discharge for 100h. The catalyst of the invention has the advantages of simple preparation process, low cost, high activity in catalytic decomposition of nitrous oxide, and good stability. With wide applicability, the technology in the invention can be used in a lot of discharge reduction processes (like nitric acid production, adipic acid production and other processes) of N2O from industrial sources, thus boasting very wide application prospects.

The invention provides a technical proposal for performing effective performance evaluation on a complex embedded system. In order to handle the performance evaluation problem of the embedded system becoming more complex, the invention provides a thought, a method and a technical proposal for performance analysis and evaluation of the complex embedded system according to a verification result after a novel interactive Markov chain (IMC) performance model is adopted to abstract the complex embedded system, an improved formal language namely action based continuous simulation language (aCSL) is adopted to describe performance specification, and IMC model detector software is utilized to automatically verify the performance specification of the embedded system. The thought is novel and practical, the method solves problems at high speed, has not high requirement on computation space, and saves computation cost, and the proposal has clear and definite process and strong operability; and the automatic verification and analysis functions of a model detector can give an accurate performance index range of the embedded system. The invention provides an accurate quantizing proposal for evaluating the complex embedded system, and has good assistance for evaluation and improvement of a development model of the embedded system.

The invention discloses a rainfall test box, comprising a box body, a transparent glass door, an air inlet cylinder, a first transparent glass plate, a first scale line, a material mixing cylinder, amaterial mixing motor, a burdening cylinder, a second transparent glass plate, an air inlet fan, a filtering plate, a spray component, a leakage plate, a water inlet, a stirring rod and a discharge valve. The rainfall test box disclosed by the invention is provided with the material mixing cylinder and the burdening cylinder, and is provided with the first scale line and a second scale line, so that matching simulation can be performed according to the pH of the rainwater, the simulation effect is improved, the rainfall test box is provided with the spray component to perform movable spray, sothat multi-angle movable spray can be performed, the rainwater spray state in a natural state can be simulated, the simulation state is diversified, the simulation effect is good, the rainfall test box is provided with the air inlet fan to achieve a cooperative simulation state of the wind power of the spray, so that the test effect is improved, and the rainfall test box is provided with a transfer water pump to achieve the self-circulation of the water in the test box, so that a lot of water resources are saved under a long-term experiment, and long-term continuous simulation can be performed.

The invention discloses an urban lake eutrophication simulation method and an urban lake eutrophication simulation system based on FVCOM and remote sensing inversion, which belong to the field of lakewater environment simulation. The urban lake eutrophication simulation method comprises the steps of: constructing a plurality of remote sensing inversion models by employing remote sensing image data and a plurality of machine learning algorithms, and combining the plurality of remote sensing inversion models; performing remote sensing inversion on eutrophication indexes by means of the remote sensing inversion model obtained through combination; simulating and predicting the lake eutrophication indexes based on an FVCOM model; correcting parameters and an output result of the FVCOM model torealize assimilation of a FVCOM model prediction result and a remote sensing inversion result; and carrying out dynamic continuous simulation and eutrophication prediction on a lake eutrophication process to be simulated by adopting the corrected and assimilated FVCOM model. The urban lake eutrophication simulation method and the urban lake eutrophication simulation system effectively improve theprecision of a water quality remote sensing inversion result by utilizing the set modeling technology, assimilate the water quality remote sensing inversion optimization value and the FVCOM model, and effectively improves the lake eutrophication simulation and prediction precision.

The invention relates to a continuous positioning system and method for navigation signals inside and outside a tunnel. A radar velocity measuring and distance measuring instrument is used for measuring the arrival velocity and distance of a target, and marking a local time scale; a time service receiver is used for resolving TOD time and a satellite ephemeris, outputting 1PPS and 10MHz signals, and transmitting the signals to a satellite navigation signal simulator; a satellite navigation signal simulator and a leakage cable are alternately connected with each other, and used for performing simulation and transmitting satellite signals to the target in the tunnel; and a comprehensive control subsystem is used for reading the TOD time, the satellite ephemeris, speed and distance information with the local time scale as well as the position coordinates of the radar velocity measuring and distance measuring instrument, the satellite navigation signal simulator and the leakage cable, andcalculating a target trajectory and a simulation moment that the satellite navigation signal simulator needs to simulate. The radar velocity measuring and distance measuring instrument is erected outside the tunnel in combination with the existing leakage cable and optical fiber routing in the tunnel, and a navigation and positioning continuous simulation system is erected in the tunnel, so that the problems of loss of positioning results and time discontinuity caused by train entering and leaving the tunnel can be solved with low cost and high accuracy.

The invention relates to an in-vitro hemodynamic characteristic test device. The in-vitro hemodynamic characteristic test device mainly comprises a constant-temperature control box, a peristaltic pump, a pressure sensor, a non-contact microscope velocity-measuring system and the like. The constant-temperature control box is connected through a pipeline and forms a closed circulation loop, simulation blood containing tracer particles is placed in the constant-temperature control box, and an outlet of the constant-temperature control box penetrates through the peristaltic pump through a silica gel hose and is connected with an inlet of the constant-temperature control box through a testing region transparent elastic hose; valves are installed at the connecting positions of the silica gel hose and the testing region transparent elastic hose respectively on the front and rear portion of a testing region, and the testing region transparent elastic hose is connected with the silica gel hose through silica gel connectors; the pressure sensor and the non-contact microscope velocity-measuring system are installed at the test section position of the testing region transparent elastic hose. The test device can provide continuous simulation pulsation blood flow, is provided with a hemodynamic characteristic parameter testing system and is capable of testing hemodynamic characteristic parameters such as blood flow velocity, wall pressure and wall shear stress in different vessels.

A text method simulating video signal processing circuit includes sending continuous simulation video signal of said circuit to data sampling module through isolation modulo, sending a group of collected discrete voltage signal to data measurement module by data sampling module, converting said discrete voltage signal to be a group of digital signal being sent to control module by data measurement module and storing said digital signal in control module, sending data to test computer after test of a group is finished and waiting for start-up of next test.

The invention discloses a simulation method for high dynamic target characteristics of an onboard responder. An unmanned aerial vehicle and an airborne responder are used for simulating a high dynamictarget, and a measurement and control experimental verification and training test is completed by combining a ground measurement and control station: the unmanned aerial vehicle is controlled to enable the unmanned aerial vehicle to be in a straight line where the position of the simulated high dynamic target flight path at the moment is connected with the ground measurement and control station;when the flight path of the unmanned aerial vehicle is limited by limit parameters and continuous simulation cannot be completed, a flight path segmentation simulation and splicing processing mode canbe adopted; the transmitting and receiving frequency forwarding ratio of the onboard responder is adjusted in real time and round-trip doppler frequency introduced by the high dynamic target in a continuous wave measuring system is restored, so as to complete the simulation of a high dynamic target speed measuring element; and the transmitting and receiving signal delay time of the onboard responder is adjusted in real time, and signal round-trip propagation and forwarding delay introduced by the high dynamic target in a pulse measuring system is reduced, so as to complete the simulation of ahigh dynamic target distance measuring element.

The invention provides a depth domain imaging simulation method and system. The depth domain imaging simulation method comprises the following steps: dividing an initial density model into windows, and setting density disturbance points in each window; determining a disturbance point density model according to the initial density model under the influence of the density disturbance points; obtaining point scattering wave field data according to the disturbance point density model and the initial density model; carrying out offset processing on the point scattering wave field data to obtain a point spread function; and obtaining depth domain simulation imaging according to the point spread function and the reflectivity model. According to the method and the system, stable and continuous simulation imaging matched with actual migration imaging can be obtained.