UMass Amherst CHE 401 - CHE 401 Lecture Notes (18 pages)

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CHE 401 Lecture Notes



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CHE 401 Lecture Notes

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Pages:
18
School:
University of Massachusetts Amherst
Course:
Che 401 - Senior Laboratory

Unformatted text preview:

DOE Review Torren Carlson Goals Review of experimental design we can use this for real experiments Review Learn useful Matlab functions Homework problem An Example Experimental Considerations Operating objectives Maximize productivity Achieve target polymer properties Input variables Catalyst co catalyst concentrations Monomer and co monomer concentrations Reactor temperature Output variables Polymer production rate Copolymer composition Two molecular weight measures Experimental Design Problem Determine optimal input values Brute force approach Select values for the five inputs Conduct semi batch experiment Calculate polymerization rate from on line data Obtain polymer properties from lab analysis Repeat until best inputs are found Statistical techniques work smarter not harder Allow efficient search of input space Handle nonlinear variable interactions Account for experimental error The Experimental Design Problem The Experimental Design Problem cont Design objectives Information to be gained from experiments Input variables factors Independent variables Varied to explore process operating space Typically subject to known limits Output variables responses Dependent variables Chosen to reflect design objectives Must be measured Statistical design of experiments Maximize information with minimal experimental effort Complete experimental plan determined in advance Design Objectives Increasing Complexity Comparative experiments Determine the best alternative Screening experiments Determine the most important factors Preliminary step for more detailed analysis Response surface modeling Achieve a specified output target Minimize or maximize a particular output Reduce output variability Achieve robustness to operating conditions Satisfy multiple competing objectives Regression modeling Determine accurate model over large operating regime Input Levels Input level selection Low high limits define operating regime Must be chosen carefully to ensure feasibility Two level



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