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  2. Feedback - Wikipedia

    en.wikipedia.org/wiki/Feedback

    A feedback loop where all outputs of a process are available as causal inputs to that process. Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause and effect that forms a circuit or loop. [1] The system can then be said to feed back into itself. The notion of cause-and-effect has to be handled ...

  3. William T. Powers - Wikipedia

    en.wikipedia.org/wiki/William_T._Powers

    Living control systems differ from those specified by Engineering control theory (a thermostat is a simple example), for which the reference value (setpoint) for control is specified outside the system by what is called the controller, [6] whereas in living systems the reference variable for each feedback control loop in a control hierarchy [7 ...

  4. Control theory - Wikipedia

    en.wikipedia.org/wiki/Control_theory

    In contrast to the frequency domain analysis of the classical control theory, modern control theory utilizes the time-domain state space representation, [citation needed] a mathematical model of a physical system as a set of input, output and state variables related by first-order differential equations. To abstract from the number of inputs ...

  5. Separation principle - Wikipedia

    en.wikipedia.org/wiki/Separation_principle

    In control theory, a separation principle, more formally known as a principle of separation of estimation and control, states that under some assumptions the problem of designing an optimal feedback controller for a stochastic system can be solved by designing an optimal observer for the state of the system, which feeds into an optimal deterministic controller for the system.

  6. Classical control theory - Wikipedia

    en.wikipedia.org/wiki/Classical_control_theory

    Classical control theory is a branch of control theory that deals with the behavior of dynamical systems with inputs, and how their behavior is modified by feedback, using the Laplace transform as a basic tool to model such systems.

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  8. Linear–quadratic–Gaussian control - Wikipedia

    en.wikipedia.org/wiki/Linear–quadratic...

    The associated more difficult control problem leads to a similar optimal controller of which only the controller parameters are different. [5] It is possible to compute the expected value of the cost function for the optimal gains, as well as any other set of stable gains. [12] The LQG controller is also used to control perturbed non-linear ...

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