The stability of systems in stochastic feedback loops

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• Roy Smith, ETH Zürich
• Friday 25 January 2019, 14:00-15:00
• Cambridge University Engineering Department, Lecture Room 4.

If you have a question about this talk, please contact Alberto Padoan.

Stochastic feedback systems give rise to a variety of notions of stability: median, mean, and variance stability conditions differ. These conditions can be stated explicitly for scalar discrete-time systems with (almost) arbitrary distributions of the stochastic feedback gain. The state variable in such systems evolves towards a heavy-tailed distribution and exhibits some non-intuitive characteristics. For example, one can use stochastic feedback to stabilise unstable systems where one does not even know the sign of the unstable pole or the sign of the system gain. A more dramatic example is an investment scheme which simultaneously yields unbounded expected profit and almost certain bankruptcy to every investor.

This talk is part of the CUED Control Group Seminars series.

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