Journal articles: 'General Purpose Simulation System'

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Acs, Gabor, Sandor Doleschall, and Eva Farkas. "General Purpose Compositional Model." Society of Petroleum Engineers Journal 25, no. 04 (August 1, 1985): 543–53. http://dx.doi.org/10.2118/10515-pa.

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Abstract A direct sequential method has been developed to simulate isothermal compositional systems. The solution technique is the same as that of the implicit pressure, explicit saturation (IMPES) method: one pressure is treated implicitly and (instead of the phase saturation) the component masses/moles are treated explicitly. A "volume balance" equation is used to obtain the pressure equation. A weighted sum of the conservation equations is used to eliminate the nonlinear saturation/concentration terms from the accumulation term of the pressure equation. The partial mass/mole volumes are used as "constants" to partial mass/mole volumes are used as "constants" to weight the mass/mole conservation equations. The method handles uniformly a range of cases from the simplified compositional (i.e., black-oil) models to the most complicated multiphase compositional models of incompressible and compressible fluid systems. The numerical solution is based on the integrated finite-difference method that allows one- (1D), two- (2D), and three-dimensional (3D) grids of regular or irregular volume elements to be handled with the same ease. The mathematical model makes it possible to develop modular versatile computer realizations; thus the model is highly suitable as a basis for general-purpose models. Introduction During the last three decades reservoir simulators have been well developed. The enormous progress in computer techniques has strongly contributed to the development of increasingly effective and sophisticated computer models. The key numerical techniques of modeling conventional displacement methods had been elaborated upon by the beginning of the 1970's, and it was possible to develop a single simulation model capable of addressing most reservoir problems encountered. Since the 1970's, however, because of the sharp rise in oil prices, the need for new enhanced recovery processes has forced reservoir-simulation experts to develop newer computer models that account for completely unknown effects of the new displacement mechanisms. The proliferation of recovery methods since the 1970's has resulted in a departure from the single-model concept because individual models tend to be developed to simulate each of the new recovery schemes. This proliferation of models, however, seems to be a less than ideal situation because of the expense involved in the development, maintenance, and applications training for the multiple new models. In addition, when different models are applied to simulate various enhanced recovery methods, no common basis exists to help survey, compare, and thus understand the different recovery mechanisms. The importance of a single, general simulator capable of modeling all or most recovery processes of interest was emphasized by Coats, who worked out a model as a step in this direction. Economic restrictions have also forced various companies to develop multiple-application reservoir models. The multiple-application reservoir simulator (MARS) program presented by Kendall et al. is one realization of the goal: a single program for multiple application. From a mathematical point of view, reservoir simulators consist of a set of partial differential equations and a set of algebraic equations, both with the appropriate initial and boundary conditions. In isothermal cases the partial differential equations, taking into account Darcy's law, describe the mass/mole/normal-volume conservation for each component of the reservoir fluid system. Phase and/or component transport caused by capillarity, gravity, and/or diffusion also can be taken into account. The algebraic equations describe the thermodynamic properties of the reservoir fluid/rock system. The existence of properties of the reservoir fluid/rock system. The existence of local and instant thermodynamic equilibria is a generally accepted assumption of reservoir simulation. This means that the number of mass/mole/normal-volume conservation equations is equal to the number of components used to describe the reservoir fluid/rock system. During the simulation the reservoir examined is divided into volume elements by a 1D, 2D, or 3D grid. Each of the volume elements is characterized by the appropriate reservoir properties and the displacement process is described by properties and the displacement process is described by a series of thermodynamic equilibria for each volume element. The difference between the simulators of conventional and enhanced recovery methods essentially arises from how many components are chosen as a means of appropriately describing the displacement process, and how the thermodynamic equilibria (thermodynamic properties) of the reservoir fluid/rock system are characterized. In cases of conventional technologies a simplified (black-oil) approach of the hydrocarbon system by a pseudogas and a pseudo-oil component generally is accepted, and the pseudo-oil component generally is accepted, and the thermodynamic properties of the given system depend only on the pressure. This approximation made it possible to develop the direct sequential IMPES solution technique, taking into account the advantage of black-oil models wherein the number of components is equal to the number of phases and thus the number of phases is equal to the number of conservation equations. SPEJ P. 543

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Martinez, Julio C., and Photios G. Ioannou. "General-Purpose Systems for Effective Construction Simulation." Journal of Construction Engineering and Management 125, no. 4 (August 1999): 265–76. http://dx.doi.org/10.1061/(asce)0733-9364(1999)125:4(265).

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Baratella, P., B. Cova, M. Damonte, E. Gaglioti, R. Marconato, and P. Scarpellini. "Fast simulation of power system dynamics in a general-purpose simulator." Control Engineering Practice 5, no. 1 (January 1997): 123–29. http://dx.doi.org/10.1016/s0967-0661(96)00216-x.

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Ohmura, Itta, Gentaro Morimoto, Yousuke Ohno, Aki Hasegawa, and Makoto Taiji. "MDGRAPE-4: a special-purpose computer system for molecular dynamics simulations." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2021 (August 6, 2014): 20130387. http://dx.doi.org/10.1098/rsta.2013.0387.

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We are developing the MDGRAPE-4, a special-purpose computer system for molecular dynamics (MD) simulations. MDGRAPE-4 is designed to achieve strong scalability for protein MD simulations through the integration of general-purpose cores, dedicated pipelines, memory banks and network interfaces (NIFs) to create a system on chip (SoC). Each SoC has 64 dedicated pipelines that are used for non-bonded force calculations and run at 0.8 GHz. Additionally, it has 65 Tensilica Xtensa LX cores with single-precision floating-point units that are used for other calculations and run at 0.6 GHz. At peak performance levels, each SoC can evaluate 51.2 G interactions per second. It also has 1.8 MB of embedded shared memory banks and six network units with a peak bandwidth of 7.2 GB s −1 for the three-dimensional torus network. The system consists of 512 (8×8×8) SoCs in total, which are mounted on 64 node modules with eight SoCs. The optical transmitters/receivers are used for internode communication. The expected maximum power consumption is 50 kW. While MDGRAPE-4 software has still been improved, we plan to run MD simulations on MDGRAPE-4 in 2014. The MDGRAPE-4 system will enable long-time molecular dynamics simulations of small systems. It is also useful for multiscale molecular simulations where the particle simulation parts often become bottlenecks.

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Oh, Kwang-Jin. "Development of a general purpose molecular simulation system from microscopic to mesoscopic scales." KIPS Transactions:PartD 12D, no. 6 (December 1, 2005): 921–30. http://dx.doi.org/10.3745/kipstd.2005.12d.6.921.

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Laurén, Mika, Giota Goswami, Anna Tupitsina, Suraj Jaiswal, Tuomo Lindh, and Jussi Sopanen. "General-Purpose and Scalable Internal-Combustion Engine Model for Energy-Efficiency Studies." Machines 10, no. 1 (December 30, 2021): 26. http://dx.doi.org/10.3390/machines10010026.

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Hybrid powertrains that combine electric machines and internal-combustion engines offer substantial opportunities to increase the energy efficiency and minimize the exhaust emissions of vehicles and nonroad working machines. Due to the wide range of applications of such powertrains, simulation tools are used to evaluate and compare the energy efficiency of hybrid powertrains for application-specific working cycles in virtual environments. Therefore, the accurate modeling of the powertrain components of a hybrid system is important. This paper presents an agile calculation tool that can generate realistic fuel consumption data of a scalable diesel engine. This method utilizes a simple efficiency model of the combustion and crank train friction model to generate the fuel consumption map in the operating area of a typical diesel engine. The model parameters are calibrated to produce accurate fuel consumption data in the initial phase of system-level simulations. The proposed method is also validated by using three real engine datasets, and the comparison of results is presented.

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Rubin, Barry, and W. Lloyd Buchanan. "A General Purpose Thermal Model." Society of Petroleum Engineers Journal 25, no. 02 (April 1, 1985): 202–14. http://dx.doi.org/10.2118/11713-pa.

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Abstract This paper describes a fully implicit four-phase (oil, water, gas, solid fuel) numerical reservoir model for simulating hot water injection, steam injection, dry combustion, and wet combustion in one, two, or three dimensions and in either a Cartesian, radial, or curvilinear geometry. The simulator rigorously models fluid flow, heat transfer (convective and conductive), heat loss to formation, fluid vaporization/condensation, and chemical reactions. Any number of oil or gas phase components may be specified, along with any number of solid phase components (fuel and catalysts). The simulator employs either D4 Gaussian elimination or powerful incomplete factorization methods to solve the often poorly conditioned matrix problems. An implicit well model is coupled to the simulator, where reservoir unknowns and well block pressures are primary variables. This paper includescomparisons of the numerical model's results with previously reported laboratory physical models' results for steam and combustion and physical models' results for steam and combustion andanalytical solutions to a hot waterflood problem. In addition, an actual field-scale history match is presented for a single-well steam stimulation problem. Introduction Recent papers by Crookston et al., Youngren Rubin and Vinsome, and Coats have outlined the current trend in thermal process simulation. The trend has been the development of more implicit, more comprehensive finite-difference simulators. Youngren describes a model based on a highly implicit steam model. The components representing air and combustion gases are treated explicitly. Burning reactions are handled not through rates but through the assumption of 100% oxygen utilization at the combustion front. Crookston et al. describe a linearized implicit combustion model that can describe the reaction of a predetermined set of gases and oils. Both of these models are predetermined set of gases and oils. Both of these models are multidimensional and do not handle wellbore-reservoir coupling fully implicitly. Rubin and Vinsome describe a fully implicit one-dimensional (ID) combustion tube simulator. Coats 4 describes a fully implicit four-phase multicomponent multidimensional combustion simulator. This model is general in nature except for the wellbore-reservoir coupling. This work describes a general, fully implicit, four-phase, multicomponent, multidimensional steam and combustion simulator that includes a fully implicit well model and a suite of powerful iterative techniques that can be used for the solution of large-scale thermal problems. The following sections of this paper describe the model's fluid and energy flow equations, property package, powerful iterative techniques capable of reliable package, powerful iterative techniques capable of reliable use with steam and combustion problems, fully implicit well model, and equation substitution formulation. Further, a section considering the applications of the model is presented. Mathematical Model The simulator ISCOM rigorously models fluid flow, vaporization/condensation phenomena, and heat transfer and is efficient enough to allow the simulation of realistically large reservoir problems. The formulation allows for any number of chemical components and reactions. The components can exist in any of four phases: oil, water, gas, or solid. A reaction also can occur in any of the above phases. Furthermore, water and any of the oil components can vaporize. The simulator development is based on the following assumptions.The model can operate in one, two, or three dimensions (1D, 2D, or 3D) with variable grid spacing.Cartesian, radial, non-Cartesian (variable-thickness grids), and specific curvilinear grids corresponding to the commonly used well patterns can be used. patterns can be used.The number of components existing in each phase is variable, and the components can be distributed among four phases.The number and type of chemical reactions can be varied.Each layer, well, or block in the reservoir can exhibit different properties (e.g., viscosities, relative permeabilities, and properties (e.g., viscosities, relative permeabilities, and compressibilities) at different times.Wells can operate under specified fluid rates or flowing pressures and are subject to a hierarchy of user-specified constraints.The simulator must be reasonably efficient to handle field-scale simulation economically, without sacrificing accuracy. Grid Generation The model defines a block-centered grid system in 1-, 2-, or 3D, normally based on Cartesian xyz coordinates. Radial geometries are accommodated by internal modification of the gridblock volumes and interblock transmissibilities. For rectangular grids with variable thickness layers, the interblock transmissibilities and gravity head terms are derived from gridblock dimensions and depth from reference. Curvilinear grids are generated by the method of conformal transformation, which yields analytical formulae for potential and stream functions. Two simple patterns are considered: one-eighth of a five-spot and one-eighth of a nine-spot. SPEJ P. 202

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TADA, YASUYUKI. "Real-Time Digital Simulation for Power System. 3-4. FlexRS. A Challenge to Reduce Power System Real-time Simulation Costs by Using General Purpose System." Journal of the Institute of Electrical Engineers of Japan 122, no. 5 (2002): 301–3. http://dx.doi.org/10.1541/ieejjournal.122.301.

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Zeid, Ashraf A., James L. Overholt, and Ronald R. Beck. "Modeling Of Multibody Systems For Controls Using General Purpose Simulation Languages." SIMULATION 62, no. 1 (January 1994): 7–19. http://dx.doi.org/10.1177/003754979406200102.

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Sivachandran R. Perumal, Faizal Baharum, Mohd Nasrun Mohd Nawi, and Mohd Faizal Omar. "Photovoltaic Potential Analysis - Fuel Cell Hybrid Energy System for General-Purpose Building of Laboratory and Offices Using HOMER Software." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 84, no. 2 (July 17, 2021): 63–81. http://dx.doi.org/10.37934/arfmts.84.2.6381.

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This paper presents a performance analysis of the potential study in complementing grid utility supply with the renewable energy system. A general-purpose building consisting of office and laboratory facility has been chosen as a test case with a hybrid system of fuel cell and solar photovoltaic cells installed in addition to the existing grid power supply. HOMER simulation software was used to run the simulations, and the results showed that only the photovoltaic system is more economical to be integrated into the system. Cost-saving from the feed-in-tariff point of view was observed spanning over several years after the initial capital cost was returned.

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Roberts, James W., Savvas G. Chamberlain, and John R. F. McMacken. "Energy-momentum transport-based simulator adapted to the general purpose semiconductor device simulation development tool CHORD." Canadian Journal of Physics 69, no. 3-4 (March 1, 1991): 217–23. http://dx.doi.org/10.1139/p91-036.

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Application of the conventional drift–diffusion model to certain submicrometre devices may be inappropriate owing to hot carrier effects. These may include localized velocity saturation overshoot and impact ionization. Silicon device models based on the conservation of carrier momentum and energy have been shown to model such effects more accurately. However, to date, these energy-momentum transport (EMT)-based simulators have been limited in scope or designed for specific device application only. This paper describes the implementation of an EMT model into the modular semiconductor device simulation tool CHORD. The simulator fully couples energy-momentum transport equations for electrons and holes with the lattice heat equation in two space dimensions and time. The EMT model is designed to be consistent with the general purpose nature of the CHORD simulation system and thus can accommodate arbitrary device structure and bias conditions. A major strength in the CHORD system is that it allows for the addition of new models with minimal interface between the user and the simulator infrastructure. The addition of the EMT model to the existing set of models, already available to CHORD users, is a representative example of the procedures involved. The equations that define the EMT model are included along with results from simulations of an ultrashort channel MOSFET (metal oxide semiconductor field effect transistor) intended to highlight carrier heating and velocity saturation overshoot.

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Purton, J. A., J. C. Crabtree, and S. C. Parker. "DL_MONTE: a general purpose program for parallel Monte Carlo simulation." Molecular Simulation 39, no. 14-15 (December 2013): 1240–52. http://dx.doi.org/10.1080/08927022.2013.839871.

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O'NEILL, M. A., and I. J. DOWMAN. "A simulation study of the ASTER sensor using a versatile general purpose rigid sensor modelling system." International Journal of Remote Sensing 14, no. 3 (February 1993): 565–82. http://dx.doi.org/10.1080/01431169308904357.

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SZCZESNY, ROMUALD, and MIECZYSLAW RONKOWSKI. "MODELING AND SIMULATION OF CONVERTER SYSTEMS PART II: SIMULATION PACKAGE TCAD." Journal of Circuits, Systems and Computers 05, no. 04 (December 1995): 669–97. http://dx.doi.org/10.1142/s0218126695000400.

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The methods, models and techniques — presented in the companion paper — have been used as a basis for the evaluation of popular general-purpose electrical circuit simulation programs, in particular, their applicability in the analysis of power electronic circuits. As a result of this critical evaluation, the general requirements for the simulation program adequate for converter systems studies and design have been formulated. On this basis the algorithm of TCAD — a general-purpose converter system simulation program — has been elaborated. In presentation of the TCAD program three parties have been distinguished: the first one emphasizes the applications of modern simulation methods for converter systems, the second describes briefly the features of the main modules of the TCAD package, and the third presents some simulation examples of practical converter systems. Three simulation examples are presented: two resonant converters and an induction motor drive fed by a full-bridge voltage source PWM inverter at normal and fault operation conditions. A good agreement between simulation and experimental results has proved that this simulation package is a power tool for research, teaching and engineering practice.

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Yuh-Ming Cheng, Lih-Shyang Chen, Hui-Chung Huang, Sheng-Feng Weng, Yong-Guo Chen, and Chyi-Her Lin. "Building a General Purpose Pedagogical Agent in a Web-Based Multimedia Clinical Simulation System for Medical Education." IEEE Transactions on Learning Technologies 2, no. 3 (July 2009): 216–25. http://dx.doi.org/10.1109/tlt.2009.18.

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ABELSON, HAROLD, ANDREW A. BERLIN, JACOB KATZENELSON, WILLIAM H. McALLISTER, GUILLERMO J. ROZAS, GERALD JAY SUSSMAN, and JACK WISDOM. "THE SUPERCOMPUTER TOOLKIT: A GENERAL FRAMEWORK FOR SPECIAL-PURPOSE COMPUTING." International Journal of High Speed Electronics and Systems 03, no. 03n04 (September 1992): 337–61. http://dx.doi.org/10.1142/s0129156492000138.

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The Supercomputer Toolkit is a family of hardware modules (processors, memory, interconnect, and input-output devices) and a collection of software modules (compilers, simulators, scientific libraries, and high-level front ends) from which high-performance special-purpose computers can be easily configured and programmed. Although there are many examples of special-purpose computers (see Ref. 4), the Toolkit approach is different in that our aim is to construct these machines from standard, reusable parts. These are combined by means of a user-reconfigurable, static interconnect technology. The Toolkit’s software support, based on novel compilation techniques, produces extremely high-performance numerical code from high-level language input. We have completed fabrication of the Toolkit processor module, and several critical software modules. An eight-processor configuration is running at MIT. We have used the prototype Toolkit to perform a breakthrough computation of scientific importance—an integration of the motion of the Solar System that extends previous results by nearly two orders of magnitude. While the Toolkit project is not complete, we believe our results show evidence that generating special-purpose computers from standard modules can be an important method of performing intensive scientific computing. This paper briefly describes the Toolkit’s hardware and software modules, the Solar System simulation, conclusions and future plans.

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Mutmansky, Jan M., and Paul P. Mwasinga. "An analysis of SIMAN as a general-purpose simulation language for mining systems." International Journal of Surface Mining, Reclamation and Environment 2, no. 1 (January 1988): 1–6. http://dx.doi.org/10.1080/09208118808944130.

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Aloui, Abdelouhab, Arezki Zioui, Megdouda Ourbih-Tari, and Amine Alioui. "A general purpose module using refined descriptive sampling for installation in simulation systems." Computational Statistics 30, no. 2 (December 24, 2014): 477–90. http://dx.doi.org/10.1007/s00180-014-0545-7.

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SZCZESNY, ROMUALD, and MIECZYSLAW RONKOWSKI. "MODELING AND SIMULATION OF CONVERTER SYSTEMS PART I: METHODS, MODELS AND TECHNIQUES." Journal of Circuits, Systems and Computers 05, no. 04 (December 1995): 635–68. http://dx.doi.org/10.1142/s0218126695000394.

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In this paper a critical analysis of the methods, models and techniques applied in modeling and simulation programs of converter systems is presented. The three principal components of the converter system, i.e. converter, electrical machine and control are considered. Different approaches to modeling of power semiconductor elements are described. A general switch model and the approach, based on the Petri net, to development of switch macromodel is presented. Electrical machine modeling based on its multiport dynamic network representation are considered, and chosen as adequate for simulations of converter/machine interactions. A basic structure and features of a general-purpose simulation program are considered. Pertinent features for its five basic stages, i.e. input/pre-processing, description of component models, equation formulation, numerical solution and output/post-processing is developed. Theoretical considerations presented in this paper, should enable, depending on a given problem to be solved, both the correct development of a special program or a rational choice of a general purpose simulation program. The practical implementation of the described methods, models and techniques into a general purpose simulation program, particularly into a TCAD package, is the topic of a companion paper.

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Verburg, Joost Mathijs, Clemens Grassberger, Stephen Dowdell, Jan Schuemann, Joao Seco, and Harald Paganetti. "Automated Monte Carlo Simulation of Proton Therapy Treatment Plans." Technology in Cancer Research & Treatment 15, no. 6 (July 9, 2016): NP35—NP46. http://dx.doi.org/10.1177/1533034615614139.

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Simulations of clinical proton radiotherapy treatment plans using general purpose Monte Carlo codes have been proven to be a valuable tool for basic research and clinical studies. They have been used to benchmark dose calculation methods, to study radiobiological effects, and to develop new technologies such as in vivo range verification methods. Advancements in the availability of computational power have made it feasible to perform such simulations on large sets of patient data, resulting in a need for automated and consistent simulations. A framework called MCAUTO was developed for this purpose. Both passive scattering and pencil beam scanning delivery are supported. The code handles the data exchange between the treatment planning system and the Monte Carlo system, which requires not only transfer of plan and imaging information but also translation of institutional procedures, such as output factor definitions. Simulations are performed on a high-performance computing infrastructure. The simulation methods were designed to use the full capabilities of Monte Carlo physics models, while also ensuring consistency in the approximations that are common to both pencil beam and Monte Carlo dose calculations. Although some methods need to be tailored to institutional planning systems and procedures, the described procedures show a general road map that can be easily translated to other systems.

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Csapo, Adam B. "The Spiral Discovery Network as an Automated General-Purpose Optimization Tool." Complexity 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/1947250.

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The Spiral Discovery Method (SDM) was originally proposed as a cognitive artifact for dealing with black-box models that are dependent on multiple inputs with nonlinear and/or multiplicative interaction effects. Besides directly helping to identify functional patterns in such systems, SDM also simplifies their control through its characteristic spiral structure. In this paper, a neural network-based formulation of SDM is proposed together with a set of automatic update rules that makes it suitable for both semiautomated and automated forms of optimization. The behavior of the generalized SDM model, referred to as the Spiral Discovery Network (SDN), and its applicability to nondifferentiable nonconvex optimization problems are elucidated through simulation. Based on the simulation, the case is made that its applicability would be worth investigating in all areas where the default approach of gradient-based backpropagation is used today.

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Saad, Mohammed Adel Elsayed, Mohammad El Bardini, and Mohammad Ibrahim Mahmoud. "Multi-Purpose Simulation and Testing Model Of the (Electronic Gas Turbine Control Unit) (EGTCU)." International Journal of System Dynamics Applications 2, no. 3 (July 2013): 36–57. http://dx.doi.org/10.4018/ijsda.2013070103.

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This paper describes a modified modeling and simulation of the measurement and control system of the single shaft Gas Turbine (GT). This GT is used in electrical power generation in Khalda Petroleum Company. The main objective of this paper is to obtain a multi-purpose controller modeling and simulation that can be used in future testing. This controller controls the GT under heavy disturbance; considering the monitored variable is the mechanical torque. That is to obtain a general GT controller which can drive either a compressor or a generator. Then a testing procedure is done to test the Electronic Gas Turbine Control Unit (EGTCU). The system response and stability are considered to modify controller parameters and validate the controller before installation in real gas turbine system.

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Rahnejat, H. "Simulating for ‘Resource Optimization’ in Robot-Assisted Automatic Assembly." Proceedings of the Institution of Mechanical Engineers, Part B: Management and engineering manufacture 200, no. 3 (August 1986): 181–86. http://dx.doi.org/10.1243/pime_proc_1986_200_069_02.

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In most manufacturing systems emphasis is now given to resource flexibility in operation. The aim is to respond swiftly to changes in product mix and/or market demands. Discrete event computer simulation is seen as a tool in defining a suitable system configuration at the preliminary design stage. Furthermore, simulation in dynamic form can represent the interactions between the system components and provide a detailed prediction of its performance. Although many existing computer simulation packages have reached a good level of general purpose modelling, by and large they lack the required versatility to deal with some specific features of manufacturing systems. One such important area is the robot-assisted automatic assembly where minimization of non-productive activities in the product assembly cycle is of vital interest. This paper introduces a flexible modelling technique which identifies the resource utilization and optimization levels during the individual processes of a product assembly cycle. Within the working constraints of an assembly system, an ‘optimal’ robot sequential cycle is obtained by implementing this modelling technique in GPSL (general purpose simulation language).

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Pinto, Felipe, and Ioannis Vourkas. "Robust Circuit and System Design for General-Purpose Computational Resistive Memories." Electronics 10, no. 9 (May 1, 2021): 1074. http://dx.doi.org/10.3390/electronics10091074.

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Resistive switching devices (memristors) constitute a promising device technology that has emerged for the development of future energy-efficient general-purpose computational memories. Research has been done both at device and circuit level for the realization of primitive logic operations with memristors. Likewise, important efforts are placed on the development of logic synthesis algorithms for resistive RAM (ReRAM)-based computing. However, system-level design of computational memories has not been given significant consideration, and developing arithmetic logic unit (ALU) functionality entirely using ReRAM-based word-wise arithmetic operations remains a challenging task. In this context, we present our results in circuit- and system-level design, towards implementing a ReRAM-based general-purpose computational memory with ALU functionality. We built upon the 1T1R crossbar topology and adopted a logic design style in which all computations are equivalent to modified memory read operations for higher reliability, performed either in a word-wise or bit-wise manner, owing to an enhanced peripheral circuitry. Moreover, we present the concept of a segmented ReRAM architecture with functional and topological features that benefit flexibility of data movement and improve latency of multi-level (sequential) in-memory computations. Robust system functionality is validated via LTspice circuit simulations for an n-bit word-wise binary adder, showing promising performance features compared to other state-of-the-art implementations.

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Chang, Kow C., Robert F. Gordon, and Edward A. MacNair. "An architecture for integrating logical and physical animations for general-purpose graphical simulation systems." Annals of Operations Research 53, no. 1 (December 1994): 343–56. http://dx.doi.org/10.1007/bf02136834.

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Omar, Mohamed A. "Static Analysis of Large-Scale Multibody System Using Joint Coordinates and Spatial Algebra Operator." Scientific World Journal 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/409402.

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Initial transient oscillations inhibited in the dynamic simulations responses of multibody systems can lead to inaccurate results, unrealistic load prediction, or simulation failure. These transients could result from incompatible initial conditions, initial constraints violation, and inadequate kinematic assembly. Performing static equilibrium analysis before the dynamic simulation can eliminate these transients and lead to stable simulation. Most exiting multibody formulations determine the static equilibrium position by minimizing the system potential energy. This paper presents a new general purpose approach for solving the static equilibrium in large-scale articulated multibody. The proposed approach introduces an energy drainage mechanism based on Baumgarte constraint stabilization approach to determine the static equilibrium position. The spatial algebra operator is used to express the kinematic and dynamic equations of the closed-loop multibody system. The proposed multibody system formulation utilizes the joint coordinates and modal elastic coordinates as the system generalized coordinates. The recursive nonlinear equations of motion are formulated using the Cartesian coordinates and the joint coordinates to form an augmented set of differential algebraic equations. Then system connectivity matrix is derived from the system topological relations and used to project the Cartesian quantities into the joint subspace leading to minimum set of differential equations.

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Glenn, Floyd. "The Case for Micro-models." Proceedings of the Human Factors Society Annual Meeting 33, no. 18 (October 1989): 1228–32. http://dx.doi.org/10.1177/154193128903301813.

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This paper examines the appropriate role of human performance micro-models in simulations of human-machine system operations. Requirements for general human micro-models are considered relative to the objectives of simulation studies, the conditions under which simulations are constructed and used, the status of human performance data bases and models, and the features provided with general-purpose simulation software. This investigation focuses particularly on a new simulation tool for simulating human-machine systems; it is known as the Human Operator Simulator – Version V (HOS-V). A general design principle of HOS-V has been to provide embedded human performance micro-models for the basic performance processes that seem most pervasive and interactive with other processes. These include representations for processes of body movement, cognition, and attention. Key to these representations are the substructures in each area. Body movement models describe locations of body parts and constraints on their movement. Cognition models describe how the human processes information through perception, memory, decision-making, and action initiation. The attention model describes how a limited attentional resource is allocated to the various body movement and cognition processes, each of which has a defined attentional requirement. Plans for implementation of micro-model components of HOS-V are discussed.

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Rao M., Srinivasa, and V. N. A. Naikan. "Availability modeling of repairable systems using Markov system dynamics simulation." International Journal of Quality & Reliability Management 32, no. 5 (May 5, 2015): 517–31. http://dx.doi.org/10.1108/ijqrm-11-2013-0184.

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Purpose – The purpose of this paper is to propose a novel hybrid approach called as Markov System Dynamics (MSD) approach which combines the Markov approach with system dynamics (SD) simulation approach for availability modeling and to study the dynamic behavior of repairable systems. Design/methodology/approach – In the proposed approach the identification of the single unit repairable system all possible states has been performed by using the Markov approach. The remaining stages of traditional Markov analysis are highly mathematically intensive. The present work proposes a hybrid approach called as MSD approach which combines the Markov approach with SD simulation approach to overcome some of the limitations of Markov process in a simple and efficient way for availability modeling and to study the dynamic behavior of this system. Findings – The proposed framework is illustrated for a single unit repairable system. The worked out example shows the steady state point and also it gives the point, interval and steady state availabilities and also the dynamic behavior of the system. However this methodology can be extended easily for more complex multi-state maintainable systems. The results of the simulation when compared with that obtained by traditional Markov analysis clearly validate the proposed approach as an alternative approach for availability modeling of repairable systems. Practical implications – In many practical situations we require to find the time at which our system reaches steady state conditions for planning maintenance activities. The proposed MSD method in this paper is capable of finding this steady state point very easily. Originality/value – The proposed approach clearly indicates the time at which the system reaches its steady state and calculates the point, interval availabilities for planning maintenance activities. The different parties, i.e., engineers and machine operators, can jointly work with this model in order to understand the dynamic behavior of repairable systems.

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Sakairi, Takashi, Eldad Palachi, Chaim Cohen, Yoichi Hatsutori, Junya Shimizu, and Hisashi Miyashita. "Model Based Control System Design Using SysML, Simulink, and Computer Algebra System." Journal of Control Science and Engineering 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/485380.

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The Systems Modeling Language (SysML) is a standard, general-purpose, modeling language for model-based systems engineering (MBSE). SysML supports the specification, analysis, and design of a broad range of complex systems such as control systems. The authors demonstrate how they can integrate a SysML modeling tool (IBM Rational Rhapsody) with a proprietary simulation tool (MathWorks Simulink) and a Computer Algebra System (CAS) to validate system specification. The integration with Simulink enables users to perform systems engineering process in a SysML model, while designing continuous control algorithms and plant behavior in Simulink, and to validate the behavior by simulating the overall composition in Simulink. The integration with a CAS enables the evaluation of mathematical constraints defined in SysML parametric diagrams. The authors also show the overall approach using a Dual Clutch Transmission (DCT) and a Cruise Control System as examples.

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Zhu, Zhi, Yonglin Lei, and Yifan Zhu. "Model Driven Combat Effectiveness Simulation Systems Engineering." Defence Science Journal 70, no. 1 (February 10, 2020): 54–59. http://dx.doi.org/10.14429/dsj.70.12777.

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Model-driven engineering has become popular in the combat effectiveness simulation systems engineering during these last years. It allows to systematically develop a simulation model in a composable way. However, implementing a conceptual model is really a complex and costly job if this is not guided under a well-established framework. Hence this study attempts to explore methodologies for engineering the development of simulation models. For this purpose, we define an ontological metamodelling framework. This framework starts with ontology-aware system conceptual descriptions, and then refines and transforms them toward system models until they reach final executable implementations. As a proof of concept, we identify a set of ontology-aware modelling frameworks in combat systems specification, then an underwater targets search scenario is presented as a motivating example for running simulations and results can be used as a reference for decision-making behaviors.

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Wang, Zhong, Hongbo Sun, and Baode Fan. "A novel steady-state maintenance simulation framework for multi- information disseminations in crowd network." International Journal of Crowd Science 4, no. 3 (April 27, 2020): 273–82. http://dx.doi.org/10.1108/ijcs-02-2020-0003.

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Purpose The era of crowd network is coming and the research of its steady-state is of great importance. This paper aims to establish a crowd network simulation platform and maintaining the relative stability of multi-source dissemination systems. Design/methodology/approach With this simulation platform, this paper studies the characteristics of “emergence,” monitors the state of the system and according to the fixed point judges the system of steady-state conditions, then uses three control conditions and control methods to control the system status to acquire general rules for maintain the stability of multi-source information dissemination systems. Findings This paper establishes a novel steady-state maintenance simulation framework. It will be useful for achieving controllability to the evolution of information dissemination and simulating the effectiveness of control conditions for multi-source information dissemination systems. Originality/value This paper will help researchers to solve problems of public opinion control in multi-source information dissemination in crowd network.

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Suresh, H., A. M. Vaibhav, and H. N. Suresh. "Power converters for three phase electric locomotives." Linguistics and Culture Review 5, S2 (November 9, 2021): 1083–92. http://dx.doi.org/10.21744/lingcure.v5ns2.1714.

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This paper is about the simulation study of auxiliary converters used in 6000 HP electric locomotives used in India. Simulation is a mirror of the operation of a real-world method or system. The process of simulating a system first requires that a model be designed. This model represents the key behaviors, characteristics, and functions of the selected physical or abstract system. It helps to analyze the behavior of the system without even building it. The results obtained are accurate in general when compared to the analytical model. It also helps to find unexpected errors and behavior of the system. Simulation is easy to perform “What-If” analysis. For this purpose, MATLAB/Simulink was used.

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Richard, M. J. "Dynamic Simulation of Multibody Mechanical Systems Using the Vector-Network Model." Transactions of the Canadian Society for Mechanical Engineering 12, no. 1 (March 1988): 21–30. http://dx.doi.org/10.1139/tcsme-1988-0004.

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Pressing technological problems have created a growing interest in the development of dynamic models for the digital simulation of multibody systems. This paper describes a new approach to the problem of motion prediction. An extension of the “vector-network” method to rigid body systems in three-dimensional space is introduced. The entire procedure is a basic application of concepts of graph theory in which laws of vector dynamics are combined. The analytical procedure was successfully implemented within a general-purpose digital simulation program since, from a minimal definition of the mechanism, it will automatically predict the behavior of the system as output, thereby giving the impression that the equations governing the motion of the mechanical system have been completely formulated and solved by the computer. Simulations of the response of a rail vehicle which demonstrate the validity, applicability and self-formulating aspect of the automated model are provided.

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Kruger, P. S., P. Lindeque, and K. Adendorff. "Simulation and the simulation language SLAM II as a systems analysis tool." South African Journal of Business Management 20, no. 3 (September 30, 1989): 154–62. http://dx.doi.org/10.4102/sajbm.v20i3.955.

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This paper provides a general introduction to the simulation technique and the simulation language SLAM II. The use of simulation modelling and in particular SLAM II is demonstrated by way of an illustrative example consisting of the building and manipulation of a simulation model of a materials handling subsystem of a beer brewing and packaging plant. The purpose of the model is to investigate the influence of the number of loading and unloading docks on various measures of system performance.

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Garre, Carlos, Domenico Mundo, Marco Gubitosa, and Alessandro Toso. "Real-Time and Real-Fast Performance of General-Purpose and Real-Time Operating Systems in Multithreaded Physical Simulation of Complex Mechanical Systems." Mathematical Problems in Engineering 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/945850.

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Physical simulation is a valuable tool in many fields of engineering for the tasks of design, prototyping, and testing. General-purpose operating systems (GPOS) are designed for real-fast tasks, such as offline simulation of complex physical models that should finish as soon as possible. Interfacing hardware at a given rate (as in a hardware-in-the-loop test) requires instead maximizing time determinism, for which real-time operating systems (RTOS) are designed. In this paper, real-fast and real-time performance of RTOS and GPOS are compared when simulating models of high complexity with large time steps. This type of applications is usually present in the automotive industry and requires a good trade-off between real-fast and real-time performance. The performance of an RTOS and a GPOS is compared by running a tire model scalable on the number of degrees-of-freedom and parallel threads. The benchmark shows that the GPOS present better performance in real-fast runs but worse in real-time due to nonexplicit task switches and to the latency associated with interprocess communication (IPC) and task switch.

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Kaufmann, Dorit, and Juergen Rossmann. "Integration of structural simulations into a real-time capable Overall System Simulation for complex mechatronic systems." International Journal of Modeling, Simulation, and Scientific Computing 10, no. 02 (April 2019): 1940002. http://dx.doi.org/10.1142/s1793962319400026.

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To meet the rising demand of performing complex tasks in a highly technologized world, the development of mechatronic systems faces two major challenges: First, the system is integrated in a fast changing environment and has to cope with dynamically modified tasks and circumstances. At the same time, the development of new methods has to be fast, cost-effective and efficient. By taking care of both aspects simultaneously, simulations have become an acknowledged tool to cost-effectively and rapidly test and optimize new solutions for complex mechatronic systems, as they are common in, e.g., robotics. Mostly, simulation methods are specialized for one purpose and thus used as a stand-alone tool to analyze the behavior of single components or certain aspects of the whole system. But with size and complexity of the system, the susceptibility to errors rises when the interaction between components fails. If a component shows minimal deviations to its nominal behavior, huge interdependencies between components of complex systems might cause system failure. The structural behavior of a single component is therefore as crucial to the functionality of the whole system as the interplay of all components. Both aspects have to be analyzed in parallel, which is nowadays barely considered. Consequently, this work presents the integration of structural simulations into the overall picture. The developed approach consists of a concept, an implementation and the validation for an automated bidirectional interaction to integrate results from Finite Element Analysis (FEA) into an existing, real-time capable Overall System Simulation for mechatronic systems in general and robotics in particular.

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Pi, Chen-Huan, Yi-Wei Dai, Kai-Chun Hu, and Stone Cheng. "General Purpose Low-Level Reinforcement Learning Control for Multi-Axis Rotor Aerial Vehicles." Sensors 21, no. 13 (July 2, 2021): 4560. http://dx.doi.org/10.3390/s21134560.

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This paper proposes a multipurpose reinforcement learning based low-level multirotor unmanned aerial vehicles control structure constructed using neural networks with model-free training. Other low-level reinforcement learning controllers developed in studies have only been applicable to a model-specific and physical-parameter-specific multirotor, and time-consuming training is required when switching to a different vehicle. We use a 6-degree-of-freedom dynamic model combining acceleration-based control from the policy neural network to overcome these problems. The UAV automatically learns the maneuver by an end-to-end neural network from fusion states to acceleration command. The state estimation is performed using the data from on-board sensors and motion capture. The motion capture system provides spatial position information and a multisensory fusion framework fuses the measurement from the onboard inertia measurement units for compensating the time delay and low update frequency of the capture system. Without requiring expert demonstration, the trained control policy implemented using an improved algorithm can be applied to various multirotors with the output directly mapped to actuators. The algorithm’s ability to control multirotors in the hovering and the tracking task is evaluated. Through simulation and actual experiments, we demonstrate the flight control with a quadrotor and hexrotor by using the trained policy. With the same policy, we verify that we can stabilize the quadrotor and hexrotor in the air under random initial states.

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Tenaglia, C. A., and D. E. Orin. "Design of a Roller Coaster System Through Graphical Simulation." Journal of Mechanical Design 121, no. 4 (December 1, 1999): 640–46. http://dx.doi.org/10.1115/1.2829511.

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This paper presents a roller coaster system model for the purpose of developing a graphical simulation of a roller coaster system. A foundational set of track elements with constant curvature and constant bank angle is developed. For these elements, a general parameterization scheme is proposed and equations are developed to generate the spatial location of the track and train. Kinematic equations of train motion are also developed, and results are presented for a test track which features many of the elements presented in this paper. Speed and acceleration data which are generated provide important information concerning the ride performance of the roller coaster system.

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Wang, Chong. "RGB Primary Color LED Backlight System Based on MCU." Advanced Materials Research 779-780 (September 2013): 1719–22. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.1719.

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A solution was proposed for the purpose of backlight. According to the principle of three primary color£¬A kind of RGB led backlight was designed with ncp6223 chip dedicated to the RGB illumination or backlight LCD display when ncp5623 was controlled by MCU. The realization of I2C bus which was used to control ncp5623 was taken the measure of direct driving of ncp5623 Using two arbitrary general-purpose IO pin of MCU. In respect of communication protocol, the software simulation was taken. Moreover only minimum system was needed for MCU. This method mentioned above simplified design and cut the cost because of absence of master I2C controller. In respect of software design, every template which realized a function of ncp5623 in the manner of software simulation of I2c protocol was given. In another word, a general method was given. From these templates, a lot of design such as Gradual intensity Dimming, RGB function and so on can be realized. This has a great signification for teaching and practice.

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He, Ping, Seyed Arefifar, Congshan Li, Fushuan Wen, Yuqi Ji, and Yukun Tao. "Enhancing Oscillation Damping in an Interconnected Power System with Integrated Wind Farms Using Unified Power Flow Controller." Energies 12, no. 2 (January 21, 2019): 322. http://dx.doi.org/10.3390/en12020322.

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The well-developed unified power flow controller (UPFC) has demonstrated its capability in providing voltage support and improving power system stability. The objective of this paper is to demonstrate the capability of the UPFC in mitigating oscillations in a wind farm integrated power system by employing eigenvalue analysis and dynamic time-domain simulation approaches. For this purpose, a power oscillation damping controller (PODC) of the UPFC is designed for damping oscillations caused by disturbances in a given interconnected power system, including the change in tie-line power, the changes of wind power outputs, and others. Simulations are carried out for two sample power systems, i.e., a four-machine system and an eight-machine system, for demonstration. Numerous eigenvalue analysis and dynamic time-domain simulation results confirm that the UPFC equipped with the designed PODC can effectively suppress oscillations of power systems under various disturbance scenarios.

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Song, Dengwei, Hongmei Liu, Le Qi, and Bo Zhou. "A General Purpose Adaptive Fault Detection and Diagnosis Scheme for Information Systems with Superheterodyne Receivers." Complexity 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/4763612.

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A superheterodyne receiver is a type of device universally used in a variety of electronics and information systems. Fault detection and diagnosis for superheterodyne receivers are therefore of critical importance, especially in noise environments. A general purpose fault detection and diagnosis scheme based on observers and residual error analysis was proposed in this study. In the scheme, two generalized regression neural networks (GRNNs) are utilized for fault detection, with one as an observer and the other as an adaptive threshold generator; faults are detected by comparing the residual error and the threshold. Then, time and frequency domain features are extracted from the residual error for diagnosis. A probabilistic neural network (PNN) acts as a classifier to realize the fault diagnosis. Finally, to mimic electromagnetic environments with noise interference, simulation model under different fault conditions with noise interferences is established to test the effectiveness and robustness of the proposed fault detection and diagnosis scheme. Results of the simulation experiments proved that the presented method is effective and robust in simulated electromagnetic environments.

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Bowles, David E., and Lorraine R. Gardiner. "Supporting process improvements with process mapping and system dynamics." International Journal of Productivity and Performance Management 67, no. 8 (November 12, 2018): 1255–70. http://dx.doi.org/10.1108/ijppm-03-2017-0067.

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Purpose The purpose of this paper is to study the effectiveness of combining process mapping and system dynamics (SD) in an organization’s ongoing business process improvement projects. Design/methodology/approach Norfield Industries, designer and manufacturer of prehung door machinery, used process mapping and SD in a project targeting the improvement of its design document control process. The project team first used process mapping to document its current process and identify potential improvements. The team then developed an SD model to investigate the potential impacts of proposed process changes. Findings The case study supports the communication and transparency benefits of process mapping reported in earlier studies. Consistent with other case studies using simulation, SD provided useful insights into possible results of proposed process changes. Research limitations/implications The findings have limitations with respect to generalizability consistent with the use of a case study methodology. Practical implications Organizational managers desiring to include simulation modeling in process improvement efforts have a choice between discrete event simulation and SD. SD may prove able to consume less organizational resources than discrete-event simulation and provide similar benefits related to reducing the risks associated with process changes. Originality/value The current case study adds to the existing literature documenting the use of process mapping combined with simulation modeling in process improvement efforts. The case study supports existing literature regarding the value of process mapping in making system processes more transparent. The results also support previous findings regarding the value of SD for simulating the possible results associated with scenarios under consideration for process improvements.

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Wang, Xiang Jin, Guo Dong Li, Zhi Lu Zhang, and Zhe Li. "Design on Light Geodesic Instrument Semi-Physical Simulation Training System Based on Virtual Scene." Advanced Materials Research 926-930 (May 2014): 1517–21. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1517.

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This paper takes the light geodesic instrument as the research object, puts forward a design idea of the semi-physical simulation training system based on the virtual scene and realizes three-dimensional modeling, real-time scene drawing and real-time data driving display through Virtools and Visual C++. ARM7 and the general-purpose single-chip microcomputer are adopted to realize the function simulation of the equipment. This simulation training system has the characteristics of low cost, low power consumption and high simulation degree.

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Lv, Chao, Shuang Liu, Shi Ming Wang, and Bei Cai. "The Production System Automatic Layout Based on Simulation." Advanced Materials Research 819 (September 2013): 393–97. http://dx.doi.org/10.4028/www.scientific.net/amr.819.393.

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The U-Shaped layout and function of production system is studied, the purpose is showing how the layouts and their main function influence each other, thus to provide enlightenments and references to improve the design of the production system layout. The simple automatic arrangement system is presented based on Plant Simulation software and focused on an equipment layout problem. The automatic layout system is an automatic layout system of workshop layout according to data; adopt the method of simulation modeling combined with optimization of the workshop layout. According to the different optimization objectives, the user can get a different optimal solution. Through simulation, we can get the default layout of the carrying amount, size and arrangement, combined with the enterprise's actual situation. The appropriate adjustments and production efficiency of production workshop are improved, and the operation time of manual modeling is shortened.

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Akahoshi, Yutaro, Sinya Aoki, Tatsumi Aoyama, Issaku Kanamori, Kazuyuki Kanaya, Hideo Matsufuru, Yusuke Namekawa, Hidekatsu Nemura, and Yusuke Taniguchi. "General purpose lattice QCD code set Bridge++ 2.0 for high performance computing." Journal of Physics: Conference Series 2207, no. 1 (March 1, 2022): 012053. http://dx.doi.org/10.1088/1742-6596/2207/1/012053.

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Abstract Bridge++ is a general-purpose code set for a numerical simulation of lattice QCD aiming at a readable, extensible, and portable code while keeping practically high performance. The previous version of Bridge++ is implemented in double precision with a fixed data layout. To exploit the high arithmetic capability of new processor architecture, we extend the Bridge++ code so that optimized code is available as a new branch, i.e., an alternative to the original code. This paper explains our strategy of implementation and displays application examples to the following architectures and systems: Intel AVX-512 on Xeon Phi Knights Landing, Arm A64FX-SVE on Fujitsu A64FX (Fugaku), NEC SX-Aurora TSUBASA, and GPU cluster with NVIDIA V100.

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Srinivasa Rao, Meesala, and V. N. A. Naikan. "A Markov System Dynamics Approach for Repairable Systems Reliability Modeling." International Journal of Reliability, Quality and Safety Engineering 23, no. 01 (February 2016): 1650004. http://dx.doi.org/10.1142/s0218539316500042.

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The study and analysis of repairable systems is an important topic in reliability. Analytical techniques become very complicated and unrealistic especially for modern complex systems. There have been attempts in the literature to evolve more realistic techniques using simulation approach for reliability analysis of systems. The purpose of this paper is to develop a novel Markov system dynamics (MSD) simulation framework for the reliability modeling and analysis of a repairable system. This paper proposes a hybrid approach called as MSD approach which combines the Markov approach with system dynamics simulation approach for reliability modeling. This approach will have the advantages of both Markov as well as system dynamics methodologies. The proposed framework is illustrated for a repairable two component system. The results of the simulation obtained in this work when compared with that obtained by traditional Markov analysis clearly validate that this novel MSD approach is an alternative approach for reliability modeling and analysis.

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Sova, Oleg, Andrii Shyshatskyi, Oleksii Nalapko, Oleksandr Trotsko, Nadiia Protas, Halyna Marchenko, Artem Kuvenov, Viktor Chumak, Yaroslav Onbinskyi, and Illia Poliak. "Development of a simulation model for a special purpose mobile radio network capable of self-organization." Technology audit and production reserves 5, no. 2(61) (September 23, 2021): 49–54. http://dx.doi.org/10.15587/2706-5448.2021.239472.

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The object of research is the military radio communication system. Effective operation of routing protocols is possible only if there is reliable information about the network topology for each of the network nodes. Construction of special purpose radio networks with the possibility of self-organization is possible only in the presence of adequate and reliable models of their work in different applications and the impact nature. It necessitates the development of new and adequate algorithms (methods, techniques) for modeling routing algorithms in special purpose radio networks with the possibility of self-organization. This work solves the problem of developing a simulation model of a mobile radio network for special purposes with the possibility of self-organization. In the course of the research, the authors used the main provisions of the queuing theory, the theory of automation, the theory of complex technical systems and general scientific methods of cognition, namely analysis and synthesis. This simulation model was developed to assess the effectiveness and adequacy of the developed scientific and methodological apparatus for routing management in special purpose radio networks with the possibility of self-organization. The research results will be useful in: ‒ development of new routing algorithms; ‒ substantiation of recommendations for improving the efficiency of the route selection process in networks with the possibility of self-organization; ‒ analysis of the electronic situation during hostilities (operations); ‒ while creating promising technologies to increase the efficiency of mobile radio networks; ‒ assessment of adequacy, reliability, sensitivity of routing algorithms; ‒ development of new and improvement of existing simulation routing models. Areas of further research will focus on the development of a methodology for the operational management of interference protection of intelligent military radio communication systems.

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Benmoussa, Mohamed, and Laurent Gauthier. "Computer-based System for Dynamic Control of Greenhouse Tomato Grown in NFT System." HortScience 30, no. 4 (July 1995): 847F—847. http://dx.doi.org/10.21273/hortsci.30.4.847f.

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To achieve high yield and better quality of soilless greenhouse tomato, it is necessary to keep the nutrient concentrations in the root environment at the target levels. Dynamic control of the nutrient solution composition can be used for this purpose. We developed a computer program that dynamically adjusts nutrient solution compositions based on various climatic and agronomic characteristics. The program integrates nutrient uptake and crop transpiration models and is part of a general-purpose greenhouse management and control software system developed at Laval University (GX). The architecture of the system and some simulation results comparing the effect of various control scenarios on the evolution of the composition of nutrient solutions are presented.

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Uspenskyi, Valerij Borisovich, and Mariia Vladimirovna Nekrasova. "Mathematical description of a hybrid quadrocopter for the purpose of computer simulation of controlled motion." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 2 (December 31, 2021): 78–85. http://dx.doi.org/10.20998/2078-9130.2021.2.249532.

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The problem of constructing the most complete mathematical model of the movement of a hybrid-type quadcopter, which, in addition to electric motors, is also equipped with an internal combustion engine, is considered. The relevance of this development is due to the desire to create a control system for a quadcopter of relatively new design, and the feasibility of development is due to the desire to use integrated design, improving the design of the device and elements of navigation and control. The developed mathematical model of the motion of the center of mass of the quadcopter and around the center of mass includes control variables and takes into account the gyroscopic moments from the rotors of the engines - carriers of kinetic moments. This model can be used in the process of designing and debugging control algorithms for such aircraft. The main method of modeling is the numerical integration of the system of differential equations. The given modeling complex will allow to carry out researches on influence of perturbing factors and imperfection of elements of a control system; test and improve management laws; to modernize the design of the quadcopter to increase the efficiency of operation. The advantage of the model is its validity, openness, versatility, as it is easy to adapt to any other design of the quadcopter.

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Li, xiu, hao jie Yang, pei lin Dou, and shi fa Zhao. "Analysis on water hammer protection of FPSO ballast water system." Journal of Physics: Conference Series 2029, no. 1 (September 1, 2021): 012125. http://dx.doi.org/10.1088/1742-6596/2029/1/012125.

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Abstract In practical engineering, the protection of FPSO water hammer is very important. Through simulation analysis, the relevant data are obtained to provide reference for relevant engineering practice. A general-purpose FPSO ballast water pipe network system was established by aft impulse software, and water hammer simulation calculation and analysis were carried out to find out the maximum pressure position of water hammer phenomenon. According to the water hammer generation mechanism, the simulation research was carried out by two-stage valve closing and adding surge tank into the pipeline. It was found that water hammer was easily caused by quick closing valve; the protection method of two-stage valve closing and installation of surge tank has a very objective protective effect, which provides a reference for related projects.

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Journal articles on the topic 'General Purpose Simulation System'

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