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Model-Free Adaptive Control of Lab Systems

Lab Applications
MFA Controller Types
MFA Benefits
• High-speed adaptive control at one millisecond rate
• Rapid thermal processing - RTP
• Ultrasonic wind-tunnels
• Lab chemical or bio-tech reactors
• Lab distillation columns
• Water treatment - pH control
• Prototyping and testing of engines, turbines, compressors, motion systems, semiconductor equipment, mechanical systems, and robotics.
SISO MFA to replace PID
Nonlinear MFA to control extremely nonlinear processes
Anti-Delay MFA to control processes with large time delays or with large t/T Ratios
Feedforward MFA to deal with measurable disturbances
MFA pH to control pH processes
MIMO MFA to control multivariable processes.
• Using no process models delivers lower development costs and faster time to market
• More robust and precise control delivers better lab test results
• No manual tuning delivers lower operating costs and longer up time
• User friendly - MFA is easier than PID to launch and maintain
• Use of MFA as enabling control technology in final products.

The Inside of Model-Free Adaptive (MFA) Control

MFA Features
MFA Inside Story
Key Points
Description
Controls complex systems
Adaptive
Adaptive weighting factors are updated in every sample interval to minimize error e(t).
Requires no precise process models Robust
Provides a wider robust range than PID and many other controllers.
Requires no process identification Speed
No time consuming model training; controls process immediately.
Requires no controller design Stability
Guarantees closed-loop stability for passive processes.
Requires no complicated manual tuning Ease of Use
Easy to configure, launch, and maintain.

Item
PID
Model-Based
MFA Control
General purpose
Yes
No
Yes
Needs Models
No
Yes
No
Needs controller design
No
Yes
No
Manual tuning
Yes
No
No
Controls complex systems
No
Yes
Yes

Left: When MFA (top) and PID (bottom) start from the same oscillating control condition, PID will continue to oscillate while the MFA will quickly adapt to an excellent control condition.

 

 

 
     
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