We ask Greg:
What role do you see dynamic simulation playing in the future of developing the best fluidized bed gas reactor temperature control?
Greg's Response:
For gas reactants and a gas product, a pressure loop controls the material balance and provides the time available for...
We ask Greg:
What role do you see dynamic simulation playing in the future of developing the best multiphase reaction completion control?
Greg's Response:
For both batch and continuous reactors, reaction completion control seeks to provide a complete conversion of all reactants and...
We ask Greg:
What role do you see dynamic simulation playing in the future of developing the best liquid single phase continuous reactor composition control?
Greg's Response:
For reactions that are all in one phase (gas, liquid, or solid), inventory control (pressure or level control) cannot...
We ask Greg:
What role do you see dynamic simulation playing in the future of developing the best liquid single phase continuous reactor temperature control?
Greg's Response:
Temperature loops control the energy balance and the reaction rate through the Arrhenius equation. A cascade...
We ask Greg:
What role do you see dynamic simulation playing in the future of developing the best Flow Measurement Specifications?
Greg's Response:
Lack of recognition of the adverse effects of changes in process stream composition and operating conditions, upstream and downstream piping, and...
We ask Greg:
What role do you see dynamic simulation playing in the future of developing the best Temperature Measurement Specifications?
Greg's Response:
Process efficiency and capacity are often determined by a temperature control loop performance’s effect on the formation and...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive pH Control?
Greg's Response:
In my 50+ year career in process automation, dynamic first principle simulations have played a more extensive and critical role in pH system design than any other process...
We ask Greg:
What role do you see dynamic simulation playing in defining the best Control Valve Specifications?
Greg's Response:
The biggest problem facing nearly all control loops stems from control valve specifications not requiring the control valve internal closure member to actually move...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive state-based control?
Greg's Response:
Abnormal operating conditions not only pose process safety and performance issues but also potentially cause equipment damage and environmental violations. Often...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive procedure automation?
Greg's Response:
Startups and product or raw material mix transitions performance is particularly nonrepeatable because of manual actions, operator skill limitations and variations,...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive Cascade Control?
Greg's Response:
Dynamic first principle simulations with instrumentation dynamics included can help find, test, and tune the inner loop for cascade control so that it can correct for...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive Override Control?
Greg's Response:
Override control is considerably challenging because the controllers that are not selected tend to windup, the takeover of control is difficult to make bumpless, controller...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive Ratio Control?
Greg's Response:
Ratio control is much more effective than flow feedforward control if there are good flow measurements. Ratio control enables the operator to see and if necessary, adjust a...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive Feedforward Control?
Greg's Response:
There are many measured and unmeasured disturbances to process inputs (load disturbances). A feedforward correction needs to arrive at the same point in the process at...
We ask Greg:
What role do you see dynamic simulation playing in the future of adaptive PID Tuning?
Greg's Response:
Essentially all processes are nonlinear where the open loop gain, time constants, and dead times change with operating conditions. These changes are generally quite large for...
