Simultaneous design

Bansal V, Perkins ID, Pistikopoulos EN, Ross R and van Shijnedel JMG (2000) Simultaneous Design and Control Optimisation Under Uncertainty, Comput Chem Eng, 24 261. 

So we support the protest of these folks against those whose diagrams are merely pictures of their code, who simultaneously design parts that rightfully should be independent. We also support the argument against the blind use of tools that convert between pictures and code—and doubly so for people who do so in both directions and claim they have produced abstract analysis and design models. 

The proposed formulation addresses the problem of simultaneous design of an integrated network of refineries and petrochemical processes. The proposed model is based on the formulations proposed in this dissertation. All material balances are carried out on a mass basis with the exception of refinery quality constraints of properties that only blend by volume where volumetric flow rates are used instead. The model is formulated as follows ... 

Using the problem formulation and solution given in Logsdon et al. (1990) the optimal design, operation and profit are shown in Table 7.6. The optimal reflux ratio profiles are shown in Figure 7.8. Period 1 refers to Task 1 and Period 2 refers to Task 2. The results in Table 7.6 and Figure 7.8 clearly show the benefit of simultaneous design and operation optimisation for multiple separation duties. The benefit has been obtained due to reduction in batch time. 

A two-level optimisation solution technique as presented in Chapter 6 and 7 can be used for a similar optimisation problem. For a given product specifications (in terms of purity of key component in each Task) and considering ReTi as the only outer level optimisation variable, the above MDO problem (OP) can be decomposed into a series of independent minimum time problem (Single-period Dynamic Optimisation (SDO) problem) in the inner level. For each iteration of the outer level optimisation, the inner-level problems are to be solved. As mentioned in the earlier chapters, the method is efficient for simultaneous design and operation optimisation especially with multiple separation duties. 

Reyes, F., W.L. Luyben, Extensions of the simultaneous design of gas-phase adiabatic tubular reactor systems with gas recycle, Ind. Eng. Chem. Res., 40, 635-647 (2001)... 

There are two main multivariate optimization strategies those based on sequential designs and those based on simultaneous designs. 

A. K. Sunol, A Mixed Integer (Non) Linear Programming Approach to Simultaneous Design of Product and Process , in L. T. Biegler and M. F. Doherty (eds.). Fourth... 

Heat integration of distillation columns can lead to significant energy saving. However, this should not penalise operability. In this section we will show how simultaneous design and control can solve conveniently this problem (Bildea and Dimian, 1999). 

The quantitative assessment of the controllability and resiliency of chemical processes has generated considerable interest. The term resiliency was introduced by Morari (1983), who also pioneered qualitative measures for its assessment. Furthermore, Perkins (1989) presented an approach for the simultaneous design of processes and their control systems that addresses plantwide controllability directly. 

All the pieces of a distillation column will be specified (column, control valves, and pumps) so that we can perform a dynamic simulation after the steady-state simulation is completed. If we were only interested in a steady-state simulation, pumps and control valves would not have to be included in the flowsheet. However, if we want the capability to do simultaneous design (steady-state and dynamic), these items must be included to permit a pressure-driven dynamic simulation. 

The complex nonideal distillation columns considered in this chapter provide good examples of the difficulties and capabilities of using simulation in distillation systems for steady-state design. Now we are ready to move to an equally important phase of design in which the dynamics and control of the column or systems of columns and other units are considered. Simultaneous design involves both steady-state and dynamic aspects of the process. 

Alvarado-Morales, M., Hamid, M.K.A., Sin, G., Gernaey, K.V., Woodley, J.M., Gani, R., 2010. A model-based methodology for simultaneous design and control of a bioethanol production process. Comput. Chem. Eng. 34, 2043-2061. 

In electrochemical detection schemes the signal-transduction pathway is often highly dependent, or even directly related to the immobihzation matrix, which may be modified with redox relays to allow for an optimal electron transfer from the active center of the biomolecule to the transducer surface. Specific immobihzation methods, with the main focus on the simultaneous design of appropriate electron-transfer pathways, are discussed in detail in Sect. 2.11.2. 

Rampersad, H. K. Integrated and Simultaneous Design for Robotic Assembly, Wiley, Chichester, UK, 1994. 

Rampersad HK (1994) Integrated and simultaneous design fin robotic assembly. Wiley, Chichester. ISBN 0-471-95018-1... 

Bansal V., Perkins J., Pistikopoulos E., Ross R. and van Schijndel J. (2000). Simultaneous design and control optimisation under uncertainty. Computers and Chemical Engineering 24, 261—266. 3.3,... 

The glow discharge (GD) is a reduced-pressure gas discharge generated between two electrodes in a tube filled with an inert gas such as argon. The sputtered atom cloud in a GD source consists of excited atoms, neutral atoms, and ions. The emission spectrum can be used for emission spectrometry in the technique of GD-OES, but the GD source can also be used for AAS, AFS, and MS. The source can be used with any of the types of spectrometers discussed for plasma emission sequential monochromator, Rowland circle polychromator, echelle spectrometer, or combination sequential-simultaneous designs. The detectors used are the same as described for plasma emission spectrometry PMTs, CCDs, or CIDs. 

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