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• W1569205953 abstract "Traditionally, processes and controllers are designed sequentially. Firstly, the process configurations (structures) and parameters are designed to satisfy the economic objectives, such as maximum profit or minimum operational costs. The designs are based on steady state models, and they are subjected to the operational constraints. Then, the controllers are designed, with a focus on rejecting the possible effects of external disturbances and process uncertainties, and achieving the desired dynamic performance. This approach carries a risk in that it may end up choosing the cheapest process design that can prove difficult to control. It may also miss out a slightly less economic but easier to control design, the one that might be more profitable in the long run (Weitz & Lewin, 1996). Operability properties of a process determine how process dynamics affect the quality of a process control design. These include flexibility, controllability, optimality, stability, selection of measurements and manipulated variables. The flexibility is defined as ‘the ability to maintain the process variables within the feasible operational region, despite the presence of uncertainties’ (Grossman et al., 1983). Flexibility is often considered simultaneously with the economic objectives and hence the optimality issue is raised. As a consequence, flexibility studies are dominated by numerous optimization strategies. Those studies aim at the determination of flexible operational spaces and flexibility measurements. The analysis generally involves two complementary tasks, the calculation of the flexibility index and the flexibility test. Operational flexibility is an important issue when designing and operating a chemical plant. Very often, flexibility is concerned with the problem of ensuring a feasible steady-state operation over a variety of operating uncertainties. To quantify how flexible a process is many metrics have been developed. Grossmann et al. (1983) first introduced the flexibility index FIG which quantifies the smallest percentage of the uncertain parameters' expected deviation that the process can handle. Another metric named resilience index RI was adopted by Saboo et al. (1985). These two measurements -FIG and RI– require identification of the nominal point, which must be located within the feasible region. These measurements however only take the critical uncertainty into account. This may cause serious flexibility under-estimation or neglect the ability of the process to handle other process uncertainties. To solve this problem, Pistikopoulos and Mazzuchi (1990) proposed an index called" @default.
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• W1569205953 date "2011-09-22" @default.
• W1569205953 modified "2023-09-26" @default.
• W1569205953 title "Flexibility Study for a MSF by Monte Carlo Simulation" @default.
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• W1569205953 doi "https://doi.org/10.5772/24689" @default.
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