Solution methods used on the continuous allocation

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Unformatted text preview: where ai = ⎛at τ = C ∑⎜ i i ⎜ i =1 ⎝ C pi where C p y , C pi are the process capability indices. n 2 2 py ⎞ ⎟, ⎟ ⎠ 2 2.2. Tolerance allocation In an early design phase, the nominal values are assigned to each dimension of the product. From design requirements, an upper bound on the variation of each critical An Efficient Solution 117 measure is known. The task is then to specify tolerances such that (a) these bounds are not violated and (b) a certain property is optimized. This property does not necessarily have to coincide with the manufacturing cost in any way; it could be a pure geometric characteristic that is desired to be minimized/maximized. Another application could be to allocate tolerances such that they each contribute ‘as equally as possible’ to the critical measure variation. Hermansson and Lööf [Hermansson and Lööf, 2005] modeled and implemented this particular instance as a GUI (Graphical User Interface) coupled with commercial CAT software [RD&T, 2002]. The most common application of tolerance allocation is nevertheless to minimize the manufacturing cost. This can be modeled as min ...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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