Simulation is often used:
- no suitable theoretical model exists
- the problem is so complex that a theoretical model cannot represent the interrelationships properly.
Simulation is ’the imitative representation of the functioning of one system or process by means of the functioning of another’
- Simulation is “the modeling of a process or system in such a way that the model mimics the response of the actual system to events that take place over time.”
- By studying the behavior of the model, insight about the behavior of the actual system can be gained.
- In practice,
- Simulation is performed using commercial simulation software.
- Performance statistics are gathered during the simulation
- Modern simulation software provides a realistic, graphical animation of the system being modeled.
- During the simulation, the user can interactively adjust the animation speed and change model parameter values to do “what-if” analysis on the fly.
- State-of-the art simulation technology provides optimization capability
Why we choose to simulate?
- Simulation provides a way to validate whether or not the best decisions are being made.
- Simulation avoid the expensive, time-consuming, and disrupted nature of traditional trial-and-error techniques.
- The power of simulation lies in the fact that it provides a method of analysis that is not only formal and predictive, but is capable of accurately predicting the performance of a system.
- By using a computer to model a system before it is built or to test operating policies before they are actually implemented, many of the pitfalls can be avoided
When Simulation is Appropriate
- Not all system problemsthat could be solved with the aid of simulation should be solved using simulation,
- It is important to select the right toolfor the task.
- Simulation has certain limitationsof which one should be aware before making a decision to apply it to a given situation.
- As a general guideline, simulation is appropriate if:
- An operational (logical or quantitative) decision is being made.
- The process being analyzed is well defined and repetitive.
- Activities and events are interdependent and variable.
- The cost impact of the decision is greater than the cost of doing the simulation.
- The cost of experiment on the actual system is greater than the cost of simulation.
The process of simulation experimentation