emgr - Empirical Gramian Framework
- Empirical gramians can be computed for linear and nonlinear control systems for model order reduction or or system identification. The emgr framework is a compact open source toolbox for GRAMIAN-based model reduction and compatible with OCTAVE and MATLAB.
- http://gramian.de

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

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

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

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

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

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

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

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/

Review of Classical Control Theory
- Review of the control theory from the University of Arizona, USA. Addresses feedback control, steady state errors, transient and frequency response.
- http://classes.engr.arizona.edu/ame558/public_html/topic1/page1.html

Resource Center for Engineering Laboratories on the Web
- Resource center dedicated to the control and process dynamics of the University of Tennessee. Includes interactive experiments, tutorials and publications.
- http://chem.engr.utc.edu/

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

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

PID Control - System Characterization – Stability
- Comprehensive article about PID control and related stability aspects.
- http://zone.ni.com/devzone/devzone.nsf/webcategories/29533F539B47A15B8625696B00744C42

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

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

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

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

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/

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

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

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

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

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

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