Control Theory

Control Tutorials for Matlab: PID Tutorial - Introduction to the theory with focus on PID control. Includes background and examples with source code.
http://www.engin.umich.edu/group/ctm/PID/PID.html

System-Specific PI Control Theory for Fluid and Motion Systems - Scientific summary about analytical PI and PID control tuning methods.
http://www.control-innovation.com

Classical Feedback Control with Matlab - Scientific article on the closed loop control. Addresses system design, filtering, control optimization, stability, Bode and Nyquist diagrams.
http://www.luriecontrol.com/CFC/ch4/C4.htm

Wikipedia: Control Engineering - Definition of control engineering. Includes modelling approaches and application fields.
http://en.wikipedia.org/wiki/Control_engineering

Control Theory 101 - Describes the basics of PID algorithms. Addresses proportional, integral and derivative components and their effects.
http://www.flightgear.org/Docs/XMLAutopilot/node2.html

Signals, Systems and Control Demonstrations - Resource of applets and interactive lectures dedicated the control theory from the Johns Hopkins University.
http://www.jhu.edu/~signals/

Wikipedia: Control Theory - Comprehensive overview and glossary about the theory. Includes definitions, mathematical aspects, historical background and examples.
http://en.wikipedia.org/wiki/Control_theory

Brief History of Feedback Control - Comprehensive article about the historical aspects of the theory and its development. Includes applications and references.
http://www.theorem.net/theorem/lewis1.html

The Nyquist Criterion Using Bode Plots - Explains the controller stability criteria based on the Nyquist frequency response. Includes mathematical formulations and diagrams.
http://virtual.cvut.cz/dynlabmodules/syscontrol/node45.html

Adjusting PID Gains - Describes the adjustment procedure of PID gains. Includes transient plots.
http://www.ctc-control.com/customer/elearning/servotut/adjus.asp

Nyquist Stability - Explains the basics of the Nyquist controller stability criteria. Includes diagrams and Bode plots.
http://www.facstaff.bucknell.edu/mastascu/eControlHTML/Freq/Nyquist3.html

Feedback and Temperature Control - Scientific article about temperature controller. Addresses controller types, algorithms, transient responses and simulations.
http://newton.ex.ac.uk/teaching/CDHW/Feedback/

FAQ on PID Controller Tuning - Introduction to PID feedback controller. Includes mathematical background, tuning aspects, implementations and tutorials.
http://www.tcnj.edu/~rgraham/PID-tuning.html

Control Theory and Engineering Links from Theorem.Net - List of resources, applets and publications.
http://www.theorem.net/control.html

PID Controller - Description of the PID control loop. Includes transient diagrams and source codes.
http://www.ecircuitcenter.com/Circuits/pid1/pid1.htm

Digital Control Tutorial - Explains the digital control theory and its applications in microprocessor-based controllers. Addresses z-transformation, stability and transient response.
http://www.engin.umich.edu/group/ctm/digital/digital.html

PID Without a PhD - Overview of the PID control theory in plain text. Addresses mathematical background, tuning and transient response.
http://www.embedded.com/2000/0010/0010feat3.htm

Bode and Nyquist Using Excel - Explains how spreadsheets can be used to obtain Bode and Nyquist Diagrams, from the University of Michigan, USA. Includes several illustrated examples.
http://www.chem.mtu.edu/~tbco/cm416/freqexcel.html

Model Order Reduction - Topic connected to dynamical systems in application to reducing complexity of a dynamical control system. Includes introduction to this field, documents and codes.
http://web.mit.edu/mor/

Russian Systems and Control Archive - Information about Russian specialists, groups, institutes, foundations, conferences, journals and books related to systems and control. [English, Russian]
http://www.rusycon.ru/english/rusycon.html

Tuning a PID Controller - Describes the different types of controller. Addresses efficiency and stability aspects.
http://www.newportus.com/Products/Techncal/techncal.htm

Design and Analysis of Control Systems Research Laboratory - Department of the University of Massachusetts, USA, concerned with control research. Includes publications, research topics and contact information.
http://www.ecs.umass.edu/mie/labs/dacs/

Web-Based Control System Analysis and Design - Applets to generate Bode diagrams, Nichols chart and Nyquist diagrams.
http://www.softintegration.com/chhtml/toolkit/control/FDAnaly.html