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    Noise sensitivity of fast output sampling controllers
    (IEEE, 1998)
    Werner, Herbert
    Fast output sampling controllers have been proposed as an alternative to observer-based state feedback control. However, a typical problem with this type of controller is noise sensitivity due to large feedback gains. In this paper, it is proposed to allow a small deviation from the exact solution to the design problem in order to reduce noise sensitivity. This can be achieved by posing the design problem in the form of an LMI problem. Fast output error dynamics can be included as an additional design objective. A practical design example serves to illustrate the approach. The performance of the controller is compared with observer-based state feedback, and experimental results show that in this case fast output sampling has superior performance.
    Publicationtype: Conference Paper
      14
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    Iterative algorithm for suboptimal periodic output feedback control
    (IEEE, 1996)
    Werner, Herbert
    This note considers periodic output feedback control of a linear time-invariant plant. An iterative algorithm is presented that yields a sub-optimal solution to the linear quadratic regulator problem. The feedback gain is obtained by alternatingly improving closed-loop behavior at sampling instants and intersample behavior. Because the solution is guaranteed stable, this algorithm provides a computationally simple method for stabilization by output feedback. As a numerical example, the periodic feedback gain for a harmonic oscillator is computed.
    Publicationtype: Conference Paper
      18