Reliable control design for a cable-stayed bridge benchmark

The paper presents a reliable control design strategy for a cable-stayed bridge benchmark using two disjoint subsystems and a linear quadratic Gaussian (LQG) design. Reliability with regard to controller failures is considered. The control design includes two stages. Local controllers are designed for reduced-order subsystems of expanded system in the design stage. They are implemented and evaluated on the original overall systems model in the consequent working stage. Two different sets of numerical experiments of reliable control design for 2 parallel controllers supposing that any one may fail. It is known as 1-out-2 controller failure structure. Reliable controllers have been systematically tested using a SIMULINK scheme and compared to the benchmark sample centralized LQG design. The performance of the reliable control design has been assessed by means of given benchmark evaluation criteria, eigenvalue analysis and time responses. The dynamics of the closed-loop benchmark model with this multiple controller exhibits an acceptable behavior though slightly worse than in the centralized case. The main result is a practical well working 1-out-2 reliable controller designed for the benchmark cable-stayed bridge.