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motivation for control with 2 examples
- 1 CSTR polymerization
- 1.1 Diagram first.
- 1.2 Chemistry
- 1.3 Basic Control Strategies
- 1.4 Recipie Based Operation
- 2. Distillation Column
- 2.1 Diagram
- 2.2 Basic Theory and what is optimized?
Discuss Constraint issue in general and result of tight process control with respect to constraints.
- Draw the basic automation hierarchy layer.
- Describe in 1-2 lines each level.
Feed Forward and
Feed Backward controller
- 1. Draw and explain both with an example.
- 2. Basic Usage,facts and consequences for feed backward controller.
- IDEAL - Time series and laplace form.
- REAL - PID
- PID with D-part only for the process variable.
Why PID is used so
- 5 important points.
- one solution to multiple problems
- linearity issues
- based on system response
Effect of control
parameters on step response and PID tuning
KP, TN, TV varied either too large or too small.
PID tuning methods
at least 5
- Ziegler and Nichols
- Chien, Hrones and Reswick
- Time summation Constant
- Optimum Absolute Value
- Bode Diagram
- Root Locus curves
Usability of PID
from practical prespective
profiles for a binary mixture
Schematc View on
- Describe the diagram
- steam consumption Y axis
- Feed Flow X axis
- efficient zone, comfort zone and optimal curve.and doing what produces an efficient column.
Measured variables? Manipulated Variables? Problem from control point of
traditional purity measurements
heuristic rules - 7 in all
- 1. Mass balance
- 2. Level control
- 3. T control
- 4. Dynamics
- 5. Decoupling
- 6. Fixed flow rate caution
- 7. Fluid Dynamics
Control Concept application(no quality measurements). Do it on the printed diagrams.
2. Where exactly should the controller and sensor be placed and for what kind of feed??
3. When there is no profile what should be done?
pressure Control Concepts.Do it on the printed diagrams.
explain also the strategy and alternatives.