Control of time delay systems in a robust sense using two controllers

The use of the ring of quasipolynomial meromorphic functions for algebraic control design for time delay systems in a robust sense is the aim of this paper. Unlike the habitual simple feedback loop, Two-Feedback-Controllers control system structure is intended to be utilized, which involves making some robust analysis first. Tunable controller parameters are set such that requirements of robust stability and robust performance are satisfied. The theoretically described methodology is verified by simulations in Matlab/Simulink environment followed by real experiments with temperature control of a laboratory circuit heating plant containing internal as well as input-output delays. The obtained results promise the applicability of the controller design approach.