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C. Benatzky, M. Kozek:
"Influence of actuator size and location on robust stability of actively controlled flexible beams";
Talk: 17th IFAC World Congress, Seoul, Korea; 2008-07-06 - 2008-07-11; in: "Proceedings of the 17th IFAC World Congress", (2008), 6 pages.

This paper addresses the influence of the actuator size on the closed loop stability of collocated and non-collocated transfer functions utilized in the structural control of flexible beams. Besides the well known robustness advantages of collocated transfer functions it is shown, that if the actuator is small compared to the flexible structure, a non-collocated actuator/sensor configuration provides larger stability margins. This effect, which comes from the uncertainty associated with the steady state gain of collocated transfer functions, is demonstrated on the model of the simply supported beam. The applicability to other types of boundary conditions and limitations due to length and spatial frequencies of the beam are also addressed.

actuator/sensor placement, collocation, non-collocation, transfer function correction