*A model is a physical, mathematical, or logical representation of a system entity, phenomenon, or process. *A simulation is the implementation of a model over time.
*A simulation brings a model to life and shows how a particular object or phenomenon will behave. -Useful for testing, analysis or training where real-world systems or concepts can be represented by a model. *Modeling and simulation (M&S) provides virtual duplication of products and processes -Represents those products or processes in readily available and operationally valid environments. *Use of models and simulations can reduce the cost and risk of life cycle activities. WHY USE MODELING?
*Modeling and simulation have become very important tools across all acquisition-cycle phases and all applications: requirements definition; program management; design and engineering; efficient test planning; result prediction; supplement to actual test and evaluation; manufacturing; and logistics support. *Four major benefits; cost savings, accelerated schedule, improved product quality and cost avoidance. M&S is now capable of prototyping full systems, networks, interconnecting multiple systems and their simulators so that simulation technology is moving in every direction conceivable. CLASSES OF MODELS & SIMULATIONS
*Virtual simulations represent systems both physically and electronically. Examples are: - Aircraft trainers, the Navy’s Battle Force Tactical Trainer, Close Combat Tactical Trainer, and built-in training. *Constructive simulations represent a system and its employment. They include: - Computer models, analytic tools, mockups, IDEF, Flow Diagrams, and Computer-Aided Design/ Manufacturing (CAD/CAM). * Live simulations are simulated operations with real operators and real equipment. Examples are: -Fire drills, operational tests, and initial production run with soft tooling. VIRTUAL SIMULATION
*Virtual simulations put the human-in-the-loop.
*The operator’s physical interface...