ABSTRACT
This chapter discusses the traditional vertex method and the active set method. These two alternative approaches can be extended to compute the temporal flexibility index (FIt). For any given design, the dynamic flexibility index (FId) should be computed first. If it can be determined that FId≥1, then, of course, no changes are needed. If otherwise and the corresponding revamp measures for achieving FId=1 are expensive, then the FIt should be determined according to the proposed mathematical program. The proper design modifications for realizing FIt=1 can then be identified on the basis of their economic implications. Because the dynamic and temporal indices are defined to characterize distinct features in the transient behaviors of unsteady systems, their numerical values should be interpreted differently.
