Design concept evaluation

Design concepts are abstract and are presented in the form of sequences of symbolic attributes and combinations of their values. Obviously, these values are qualitative (like steel, timber, or paper). 

Engineering evaluation methods are quantitative and require descriptions of engineering systems by numerical attributes with quantitative values (like dimensions, weight, or speed). 

We are talking about research initiated about 30 years ago, when computers were very slow the automated generation of a structural system in a tall building required about 2-3 hours of computer time, while today the same process takes only a few seconds. In this situation, it is possible to avoid any formal evaluation of feasible design concepts and simply to transform them 

Let us assume that we have n design concepts (DC ) to evaluate  

The goodness Ej of a given design concept DQ will be determined using the formula 

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Eor each of these classes, specific relative criteria should be identified and defined in quantitative form. How this should be done is discussed in Section 5.5, Design Concept Evaluation. The determination of evaluation criteria is not a trivial matter, because they reflect our priorities and their selection will have impact on the direction of our search for novel solutions. Eor example, if novelty is important, it should be reflected in a large value of the weights associated with all novelty criteria. 

The use of packing factors is established in the design concepts of evaluating packed tower performance. Essentially all of the manufacturer s published data are for wet and dumped packing factors, F. Robbins proposes using... 

Whatever parameter of a specific material one is evaluating, a required value for the material must be found using a design model, and an allowable value for the material must be determined by a test method. The allowable value divided by the required value yields the design ratio (DR), or the resulting FS. This design-by-function concept is necessary to design and evaluate new materials that are both feasible and safe for a variety of situations. 

Several test runs have been carried out using 1.5 dm2 laboratory cells with the F-8934 at 8kA m-2. The current efficiency at 8kA m-2 was about 1% lower than that at 5kAnT2, and no further decline was observed. F-8934 has also had a similar evaluation result in full-scale pilot cells at 8 kA m-2. AGC has been obtaining slightly lower current efficiencies than its desired target of 97% at the beginning of the membrane lifetime. This has led AGC to ensure that the other stepped-up design concept should be applied to the membrane for 8 kA m-2 operation. 

The first stage in library production is the design stage wherein we arrive at the concept, evaluate literature precedent, determine the novelty of the proposed scaffolds in regards to our internal compound collection and external patent sources, and viability of the proposed synthetic route. 

The remainder of the document is organized as follows. The next two sections lay the foundations for the terminology used in the document section 2 defines data in the context of exposure assessments and section 3 introduces a broader concept of data quality characterized by the four hallmarks or measures of quality mentioned above— appropriateness, accuracy, integrity and transparency. Section 4 discusses how these hallmarks might be applied to the design or evaluation of an exposure assessment to ensure its quality. The final section concludes with a broader perspective on the role of data quality in exposure assessment and its importance to risk assessment and risk management decisions. 

The final step is to complete a preliminary evaluation of the design concepts that, as before, can be based on physical or cost constraints. Be careful... 

Evaluate all your design concepts to create the invincible solution. 

For testing, the Mod 2 burner is housed within a heavily walled pressure vessel which also serves as a plenum chamber for the preheated inlet air supply. See Ref. 16 for a description of the test facility. The burner assembly is shown schematically in Figure 2 and is designed to use 100% of the air flow in the combustion process. Thus, air film cooling and air dilution which are normally used in an engine combustor are omitted. In this way, combustion effects from air injection are avoided for the concept evaluation. The cylindrical combustion chamber is water cooled, as are the sonic exhaust nozzle and gas sample probe. 

Complete the evaluation of the three current design concepts. Select highest potential concept(s) or combination of concepts for further development. 

After the initial development of the process flow models, the mechanical design phase of the project began. As a result of the existing technology assessment discussed above, significant initial effort was placed in the cost reduction of the reformer and shift portion of the system. Initially, 6 mechanical design concepts were developed and evaluated. 

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