Improving the Decoupling Response Bound in Multivariable Time Delay Systems

Time delays are an inherent characteristic of many multivariable processes. Their presence imposes limitations in the closed loop response. Their effects have been quantified by dynamic operability measures known as upper bounds (unachievable) and lower bounds (achievable). It is demonstrated that the detrimental effects of time delays can be minimized if the process is modified so that certain delays are increased. The approach is formulated as an optimization problem. It is demonstrated with example proplems that the modified process features improved dynamic operability.