Robust Control of Time - delay Systems , by Qing -

This decade there has been renewed interest in research on time-delay systems (TDS) due to the major influence of delays, particularly in communication networks, on control systems. Thus many applied and theoretical research works have been carried out recently on time-delay systems [1], [2], [3], [4], [5], [6]. The book intends to ”present a systematic and comprehensive treatment of robust H∞ control of TDS in the frequencydomain”. However the book only considers SISO systems with a single and constant input delay. It ignores the body of work in the time-domain, using the well-know Lyapunov-Krasovskii approach, concerning H∞ control for systems with delays (sometimes time-varying) in the state variables, [7], [8], [9], etc ... On the other hand, it is true that most studies in the timedomain only tackle the state feedback control design problem because dynamic output feedback controllers are much more complex to design [10], [11].