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  1. jblc

    Feedforward: why does feedBACK reduce itself?

    This questions related to feedforward (FF) and feedback (FB) interactions. Say there's a system who's goal is to keep a car centered in a lane. Say it includes a FF sensor (like detecting sideways wind hitting the car, or an inclinometer to detect the sideways slope of the road), and a FB sensor...
  2. jblc

    Switching between several controllers, depending on SP error.

    I'm curious about your preferred way to analyze and develop a hybrid feedback control system, where the controller is actually made up of a few unconnected controllers that you switch between. The loop is a standard feedback loop: SP --> SPerror --> controller --> plant --> PV, and PV is fed...
  3. jblc

    Coupled Setpoints ... how controllable?

    If the reference tracking setpoint is directly coupled to the plant's state, is the system always nonlinear? What is such a coupled system called? 1) Say you have a fast dynamic system, and the actuator's reference tracking target is given by its position. This is directly coupled. Eg at 0...
  4. jblc

    Discretized transfer function feedback implementation

    I'm applying feedback to a discretized time-series transfer function in software, to simulate how a physical system moves (there are other ways, I'm doing it this way for a reason). The step response of the derived time-series system IS what i'd expect when I match it with a matlab "step"...
  5. jblc

    DC model motor and viscous damping: behavior inconsistent?

    I'm unclear on why a motor model's step response isn't what i'd expect, when a damping coefficient (b) is varied. With equivalent closed loop gains, I'd expect a shorter risetime for a motor with less damping...but instead, it looks like closed-loop step responses are identical to that of a...
  6. jblc

    Minimal Realization

    One of the ways to obtain a minimal realization of a system model transfer function is to create a balanced system first from its corresponding state space equation, and eliminate states with small eigenvalues. To go back to a transfer function, it seems like we'd have to know what the new...

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