1. Introduction to Systems Engineering
- Objectives:
To analyze the dynamic operation of a process- Incentives for automatic process control
To investigate and implement changes in system
in order to improve performanceTo minimize the effect of disturbance- Feedback control
To ensure that operation remains within constraints
To optimize performance
- see page 249 for different sensors
- see page 253-256 for discussion on control valves
2. Process Modeling:
- Modeling Questions:Which way? (does increasing flow rate in decrease temperature?,etc.)
How fast? (how much time does it take to reduce pressure by 50% ?)
What is the behavior of the response? (does it oscillate?, etc.)
Will it even get there? (is it stable?)
One effective way to model dynamic behavior: differential equations
- Steady State Analysis:
- Final form of models depends on specific objectives of the modeler
- Models can be generated using basic principles from physics and chemistry, e,g,