Simulation

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Simulasi nyaeta tironan tina sababaraha alat atawa tina kaayaan nu sabenerna. Percobaan simulasi dipake keur ngagambarkeun kaayaan nu penting tina paripolah system sacara fisik atawa abstrak ku paripolah sistem sejenna.

Simulasi dipake dina sababaraha hal, kaasup pa-model-an sistim alami, sarta sistim manusa keur mikanyaho leuwih teleb kana sistim operasina; sarta simulasi dina teknologi sarta rekayasa kaamanan numana hasilna bakal dipake keur nguji hal-hal nu pakait dina kaayaan nu sabenerna. Simulasi, make hiji simulator atawa percobaan sejenna nu dijieun dina kaayaan fiktif ahirna bisa nembongkeun efek nu sabenerna tina sababaraha kaayaan nu mungkin.

[édit] Physical and interactive simulation

Physical simulation refers to simulation in which physical objects are substituted for the real thing, these physical objects are often chosen because they are smaller or cheaper, than the actual object or system.

Interactive simulation, which is a special kind of physical simulation, and often referred to as human in the loop simulations, are physical simulations that include humans, such as the model used in a flight simulator.

[édit] Simulation in training

Simulation is often used in the training of civilian and military personnel. This usually occurs when it is prohibitively expensive or simply too dangerous to allow trainees to use the real equipment in the real world. In such situations they will spend time learning valuable lessons in a "safe" virtual environment. Often the convenience is to permit mistakes during training for a safety-critical system.

Training simulations typically come in one of three categories:

"live" simulation (where real people use simulated (or "dummy") equipment in the real world);
"virtual" simulation (where real people use simulated equipment in a simulated world (or "virtual environment")), or
"constructive" simulation (where simulated people use simulated equipment in a simulated environment). Constructive simulation is often referred to as "wargaming" since it bears some resemblance to table-top war games in which players command armies of soldiers and equipment which move around a board.

[édit] Flight simulators

Main article: Flight simulator

A flight simulator is used to train pilots on the ground. It permits a pilot to crash his simulated "aircraft" without being hurt. Flight simulators are often used to train pilots to operate aircraft in extremely hazardous situations, such as landings with no engines, or complete electrical or hydraulic failures. The simulator is normally cheaper to operate than a real trainer aircraft.

[édit] Engineering simulation

Simulation is an important feature when engineering systems. For example in electrical engineering, delay lines may be used to simulate propagation delay and phase shift caused by an actual transmission line. Similarly, dummy loads may be used to simulate impedance without simulating propagation, and is used in situations where propagation is unwanted. A simulator may imitate only a few of the operations and functions of the unit it simulates. Contrast with: emulate.

Source: Federal Standard 1037C

[édit] Computer simulation

Main article: Computer simulation
Related article: Model

Computer simulation, has become a useful part of modeling many natural systems in physics, chemistry and biology, and human systems in economics and social science (the computational sociology) as well as in engineering to gain insight into the operation of those systems. In such simulations the model behaviour will change according to a set of initial parameters such as a meteorological model. Computer simulations are often considered human out of the loop simulations.

Traditionally, the formal modeling of systems has been via a mathematical model, which attempts to find analytical solutions to problems which enables the prediction of the behaviour of the system from a set of parameters and initial conditions. Computer simulation is often used an adjunct to, or substitution for, modeling systems for which simple closed form analytic solutions are not possible. There are many different types of computer simulation, the common feature they all share is the attempt to generate a sample of representative scenarios for a model in which a complete enumeration of all possible states of the model would be prohibitive or impossible.

It is increasingly common to hear simulations of many kinds referred to as "synthetic environments". This label has been adopted to broaden the definition of "simulation" to encompass virtually any computer-based representation.

[édit] Simulation in computer science

In computer science, simulation has an even more a specialized meaning: Alan Turing uses the term "simulation" to refer to what happens when a digital computer runs a state transition table (runs a program) that describes the state transitions, inputs and outputs of a subject discrete-state machine. The computer simulates the subject machine.

In computer programming, a simulator is often used to execute a program that has to run on some inconvenient type of computer. For example, simulators are usually used to debug a microprogram. Since the operation of the computer is simulated, all of the information about the computer's operation is directly available to the programmer, and the speed and execution of the simulation can be varied at will.

Simulators may also be used to interpret fault trees, or test VLSI logic designs before they are constructed. Many video games are also simulators, implemented inexpensively. These are sometimes called "sim games".

In theoretical computer science the term simulation represents a relation between state transition systems. This is useful in the study of operational semantics.