SUCCESSFUL PRODUCT ENGINEERING BY STUART PUGH. PDF. Well, book Total Design: Integrated Methods For Successful Product Engineering By Stuart. Download Citation on ResearchGate | Total design: integrated methods for successful product engineering / Stuart Pugh | Incluye bibliografía e índice. 5) Establish design specifications. 6) Generate alternatives . procedure Pugh, , Total Design in Pugh, Stuart. Total Design.

Stuart Pugh Total Design Pdf

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Total Design. By STUART PUGH. (Addison Wesley, ) [Pp] Paperback, £ Level: Designer{design lecturer. Review by Dr Christopher}. Backhouse. publication of Total Design, Integrated Methods for Successful Product .. approach developed by Stuart Pugh known as total design and explain what can be learned .pdf. Figure 2: The Total Design activity models proposed by Pugh (figure adapted . In the preface to Stuart Pugh's text on Total Design he pointed out his aim to add .

We already have a system in place and want to know if one of these four systems would be better for us. We decide what our criteria are. We pick the four most important, the ones that absolutely must be included. Let's call them 1,2,3 and 4. These can be price, time, ease of production, man-hours, whatever is most important.

Let's draw our Pugh matrix.

We put the alternatives across the top, and we are going to assess these with respect to the criteria, which we draw in on the left. Our baseline is the system we have in place at the moment, so we score this a nought against our criteria.

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Our diagram will look like this. Now consider option A. In relation to criteria 1, do we consider that it is better, the same as, or worse than the baseline? In terms of criteria 2, it's the same as the baseline. For criteria 3 it's better, and for criteria 4 its worse. Our chart now looks like this. We assess each of the alternatives B, C and D in the same way, filling in all the blanks.

So now we know the number of pluses, the number of minuses and the total score for each alternative, allowing us to make a more rational or objective decision. In this case it's obviously D, with three pluses and no minuses. Weighting We can also give each criterion a weighting.

For example, if our first criteria is a 2, and the second criteria is twice as important we give that a four. The third criteria is somewhere in between, so it's a three. Finally, the same procedure would be carried out for safety. Now it can be said for car A what percentage of the values for comfort, performance, and safety it should receive; and the same computation can be done for cars B and C.

In one case, car A could have 55 percent of total value, car B could have 30 percent of total value, and car C could have 15 percent of total value. Proponents of the process would say this is an argument for downloading car A.

The procedure, as can be seen, is very easy to perform because it uses only simple judgments. The problem is determining the strength of the recommendation of car A because it is highest on this scale. Moreover, care should be taken to ensure that some of the paired comparisons do not contradict each other.

The axiomatic structure of this process does not guarantee the alternative with the highest rating will be the most preferred alternative. Unfortunately, it can be shown that the addition of a new alternative may change the ranking of existing alternatives, a property seen as undesirable in a decision process.

The analytic hierarchy process has difficulty with uncertainty, which it can handle only in an approximate way. The process therefore provides no basis for valuing the elimination or reduction of uncertainty. The main advantage of the analytic hierarchy process is ease of understanding and application. It may have real value in making decisions with robust influence factors, where there is no possibility of a major loss and where the complete set of alternatives is known a priori.

The difficulty with the analytic hierarchy process, in addition to the theoretical features mentioned above, is that it cannot answer the questions necessary to build confidence in the selection of an alternative.

The very simplicity of the process limits its ability to answer hard questions. This section deals with decision-making tools, which are methods to address the quality of the design process, to address the variability in the process, and to convert the concept to final product.

The general process of making decisions is greatly affected by the context see Figure 2—1 in which the decisions are made.

Design decision making in the context of variation can be conceptualized as shown in Figure 4—5. The context of variation in Figure 4—5 , similarly to Figure 2—1 , has been segmented by the categories of input, output, controllable design parameters, and uncontrollable noise parameters.

In Figure 4—5 , the context is related to variation; therefore, the above four categories provide a context for decisions in which the variation needs to be considered in decision making. While there may be variation in the input requirements, the primary variation to be considered is in the design, environmental, and manufacturing parameters. An example of variation in a design parameter is the seal clearance in a shaft.

Examples of variation in environmental and manufacturing parameters are ranges in the line voltage a product Will see in use or differences in the ability of machines to meld tolerances. As a result of such Variations, the performance of individual product units will vary with respect to the design target. If the output variation is too great or the mean is not appropriately centered near the design target, then some of the units will not perform acceptably.

The decision process must adequately consider variation in design, manufacturing, and environmental parameters to ensure products delivered to the user will perform within specified limits of design intent. Page 28 Share Cite Suggested Citation:"4. The consideration given to variation in the design process differs depending on whether the variation is in a design-controlled parameter or in manufacturing- and environmental- uncontrolled parameters.

Stuart pugh total design pdf download

In the context of design decision making for products, the design parameters in Figure 4—5 are controllable whereas the environmental and manufacturing parameters are for the most part uncontrollable or at least contain an element of random variation noise.

The noise variation of environmental and manufacturing parameters cannot be changed or controlled by selection of parameter values as can be done with design parameters. The variation in environmental and manufacturing parameters either is known or can be measured and included in sensitivity analysis of design parameters. Experience has shown that inclusion of environmental and manufacturing noise variation in design decisions is crucial for products to consistently meet the design intent.

In summary, design decision making in the context of variation can significantly contribute to the success of a product from the standpoint of customer satisfaction market share and economic viability profit to business.

Including variability or noise parameters in the design and decision process, as illustrated in Figure 4—5 , enables the designer to quantify the sensitivity of the product to variation and determine the probability of success for achieving objectives relative to design limits.

Additionally, for those controllable noise variables, product performance and cost trade-offs can be quantified in terms of design intent and probability of success.

In total then, the process conceptualized in Figure 4—5 enables design decision making based not only on deterministic assessment but also on the inherent, real-world characteristics of product design. Page 29 Share Cite Suggested Citation:"4. The emphasis is on predicting the responses and not necessarily on trying to understand the underlying relationships among the variables.

PLS is not usually appropriate for screening out factors with a negligible effect on the response. However, when prediction is the goal and there is no practical need to limit the number of measured factors, PLS can be a useful tool Tobias, Svante Wold and B. In chemometrics the X factors Controllable variables may include the many spectroscopic measures taken on samples drawn from a chemical process, along with associated measures of temperatures, pressures, concentration, and flow rates.


The Y responses the behavior of other variables in turn may represent the mass, volume, viscosity, density, flow rates, and other quality measures on intermediates and final products, once again gathered across many samples. The objective of PLS is to analyze the data sets X and Y in the hope of discovering one or more signs of structure low dimensional linear relations while recognizing X and Y may both have structural aspects unrelated to one another. The idea of PLS is to extract latent factors, accounting for as much variation as possible while modeling the response well.

Download Stuart pugh total design pdf

PLS has been successfully applied in the chemical process industries. The opportunity to explore applications of PLS to the design and assembly of hardware appears unexploited to date. Several concepts were involved.

Quality should be measured by the deviation from a specified target value, rather than by conformance to preset tolerance limits.So all the numbers to the right of it are multiplied by two. Later, he became the Director of the 'Engineering Design Centre'.

Total Design by Stuart Pugh (1991, Paperback)

Consider the example of selecting an automobile to download. St George by Morgan, Giles, free ebook torrent download, Michigan , Lansing - USA, ranging from semi-classical to fully quantum mechanical, in order to understand the advantages and limitations of each, as well as elucidating the complex and interesting phenomena encountered in ultra-small devices.

Many other corporate giants, including Texas Instruments and General Electric, have adopted it since then.