Theory of Modeling and Simulation: Integrating Discrete Event and Continuous Complex Dynamic Systems

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References Related Information. Close Figure Viewer. Browse All Figures Return to Figure. Previous Figure Next Figure. Email or Customer ID. Forgot password? Old Password. New Password. Password Changed Successfully Your password has been changed. Simulation of fluid dynamics problems often require both mathematical and physical simulations. In these cases the physical models require dynamic similitude. Physical and chemical simulations have also direct realistic uses, rather than research uses; in chemical engineering , for example, process simulations are used to give the process parameters immediately used for operating chemical plants, such as oil refineries.

Simulators are also used for plant operator training. This created a safe and realistic virtual environment to train board operators and engineers. Mimic is capable of providing high fidelity dynamic models of nearly all chemical plants for operator training and control system testing. Ergonomic simulation involves the analysis of virtual products or manual tasks within a virtual environment. In the engineering process, the aim of ergonomics is to develop and to improve the design of products and work environments.

DHMs are recognized as evolving and valuable tool for performing proactive ergonomics analysis and design. The software tools typically calculate biomechanical properties including individual muscle forces, joint forces and moments. Some simulations also analyze physiological measures including metabolism, energy expenditure, and fatigue limits Cycle time studies, design and process validation, user comfort, reachability, and line of sight are other human-factors that may be examined in ergonomic simulation packages.

Modeling and simulation of a task can be performed by manually manipulating the virtual human in the simulated environment. Some ergonomics simulation software permits interactive, real-time simulation and evaluation through actual human input via motion capture technologies. However, motion capture for ergonomics requires expensive equipment and the creation of props to represent the environment or product. Some applications of ergonomic simulation in include analysis of solid waste collection, disaster management tasks, interactive gaming, [76] automotive assembly line, [77] virtual prototyping of rehabilitation aids, [78] and aerospace product design.

Theory of Modeling and Simulation

Using engineering data, the simulations assist evaluation of assembly ergonomics. The company uses Siemen's Jack and Jill ergonomics simulation software in improving worker safety and efficiency, without the need to build expensive prototypes. In finance , computer simulations are often used for scenario planning. Risk -adjusted net present value , for example, is computed from well-defined but not always known or fixed inputs. By imitating the performance of the project under evaluation, simulation can provide a distribution of NPV over a range of discount rates and other variables.

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Simulations are also often used to test a financial theory or the ability of a financial model. Simulations are frequently used in financial training to engage participants in experiencing various historical as well as fictional situations. There are stock market simulations, portfolio simulations, risk management simulations or models and forex simulations.

Such simulations are typically based on stochastic asset models. Using these simulations in a training program allows for the application of theory into a something akin to real life. As with other industries, the use of simulations can be technology or case-study driven. In comparison to training in an actual aircraft , simulation-based training allows for the training of maneuvers or situations that may be impractical or even dangerous to perform in the aircraft while keeping the pilot and instructor in a relatively low-risk environment on the ground.

For example, electrical system failures, instrument failures, hydraulic system failures, and even flight control failures can be simulated without risk to the pilots or an aircraft. Instructors can also provide students with a higher concentration of training tasks in a given period of time than is usually possible in the aircraft. For example, conducting multiple instrument approaches in the actual aircraft may require significant time spent repositioning the aircraft, while in a simulation, as soon as one approach has been completed, the instructor can immediately preposition the simulated aircraft to an ideal or less than ideal location from which to begin the next approach.

Flight simulation also provides an economic advantage over training in an actual aircraft. Once fuel, maintenance, and insurance costs are taken into account, the operating costs of an FSTD are usually substantially lower than the operating costs of the simulated aircraft.

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For some large transport category airplanes, the operating costs may be several times lower for the FSTD than the actual aircraft. Some people who use simulator software, especially flight simulator software , build their own simulator at home. Some people—to further the realism of their homemade simulator—buy used cards and racks that run the same software used by the original machine. While this involves solving the problem of matching hardware and software—and the problem that hundreds of cards plug into many different racks—many still find that solving these problems is well worthwhile.

Some are so serious about a realistic simulation that they will buy real aircraft parts, like complete nose sections of written-off aircraft , at aircraft boneyards. This permits people to simulate a hobby that they are unable to pursue in real life. Bearing resemblance to flight simulators, marine simulators train ships' personnel. The most common marine simulators include:.

Simulators like these are mostly used within maritime colleges, training institutions, and navies. They often consist of a replication of a ships' bridge, with the operating console s , and a number of screens on which the virtual surroundings are projected. Military simulations, also known informally as war games, are models in which theories of warfare can be tested and refined without the need for actual hostilities. They exist in many different forms, with varying degrees of realism.

In recent times, their scope has widened to include not only military but also political and social factors for example, the NationLab series of strategic exercises in Latin America. Simulation techniques have also been applied to payment and securities settlement systems. Among the main users are central banks who are generally responsible for the oversight of market infrastructure and entitled to contribute to the smooth functioning of the payment systems.

Central banks have been using payment system simulations to evaluate things such as the adequacy or sufficiency of liquidity available in the form of account balances and intraday credit limits to participants mainly banks to allow efficient settlement of payments.

Another application is to evaluate risks related to events such as communication network breakdowns or the inability of participants to send payments e. A common way to conduct these simulations is to replicate the settlement logics of the real payment or securities settlement systems under analysis and then use real observed payment data.

In case of system comparison or system development, naturally, also the other settlement logics need to be implemented. To perform stress testing and scenario analysis, the observed data needs to be altered, e. To analyze the levels of liquidity, initial liquidity levels are varied. System comparisons benchmarking or evaluations of new netting algorithms or rules are performed by running simulations with a fixed set of data and varying only the system setups. An inference is usually done by comparing the benchmark simulation results to the results of altered simulation setups by comparing indicators such as unsettled transactions or settlement delays.

Project management simulation is simulation used for project management training and analysis. It is often used as a training simulation for project managers.


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In other cases, it is used for what-if analysis and for supporting decision-making in real projects. Frequently the simulation is conducted using software tools. A robotics simulator is used to create embedded applications for a specific or not robot without being dependent on the 'real' robot. In some cases, these applications can be transferred to the real robot or rebuilt without modifications. Robotics simulators allow reproducing situations that cannot be 'created' in the real world because of cost, time, or the 'uniqueness' of a resource.

A simulator also allows fast robot prototyping. Many robot simulators feature physics engines to simulate a robot's dynamics. Simulation of production systems is used mainly to examine the effect of improvements or investments in a production system.

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Most often this is done using a static spreadsheet with process times and transportation times. For more sophisticated simulations Discrete Event Simulation DES is used with the advantages to simulate dynamics in the production system. A production system is very much dynamic depending on variations in manufacturing processes, assembly times, machine set-ups, breaks, breakdowns and small stoppages. They differ in usability and markets but do often share the same foundation.

Such simulations can help predict the impact of how improvements in methods might impact variability, cost, labor time, and the number of transactions at various stages in the process. A full-featured computerized process simulator can be used to depict such models, as can simpler educational demonstrations using spreadsheet software, pennies being transferred between cups based on the roll of a die, or dipping into a tub of colored beads with a scoop.

In sports, computer simulations are often done to predict the outcome of events and the performance of individual sportspeople. They attempt to recreate the event through models built from statistics. The increase in technology has allowed anyone with knowledge of programming the ability to run simulations of their models. The simulations are built from a series of mathematical algorithms , or models, and can vary with accuracy.

Accuscore, which is licensed by companies such as ESPN , is a well-known simulation program for all major sports. It offers a detailed analysis of games through simulated betting lines, projected point totals and overall probabilities. With the increased interest in fantasy sports simulation models that predict individual player performance have gained popularity.

Companies like What If Sports and StatFox specialize in not only using their simulations for predicting game results but how well individual players will do as well. Many people use models to determine who to start in their fantasy leagues. Another way simulations are helping the sports field is in the use of biomechanics. Models are derived and simulations are run from data received from sensors attached to athletes and video equipment. Sports biomechanics aided by simulation models answer questions regarding training techniques such as the effect of fatigue on throwing performance height of throw and biomechanical factors of the upper limbs reactive strength index; hand contact time.

Computer simulations allow their users to take models which before were too complex to run, and give them answers. Simulations have proven to be some of the best insights into both play performance and team predictability.

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