Managing Complexity and Uncertainty by a Modelling Approach for Decision Making in Integrated Product/Process Design

Abstract : The main objective in product design and development is to increase the value of a product. Value includes two aspects of quality and cost. In order to take into account both aspects, this thesis aims at Integrated Product and Process Design, especially on product design complexity and its inherent (associated) complexities. This thesis proposes a systematic modelling approach to reduce uncertainty and manage complexity. The approach includes two phases: model determination and system analysis. The first phase contains two propositions: first, a product modelling approach based on energy flow modelling in the framework of Characteristics-Properties Modelling (CPM). This approach gives a modelling framework for a smoother transition from functional to structural views, with a quantitative modelling. The second proposition is to help the designer for decision making in concurrent designing (IPPD) where both performance and cost are taken into account. This approach is based on the process flows in the same framework (CPM). The second phase is to use the determined model of phase 1 to analyse the system. So, phase 2 includes sensitivity analysis, tolerance analysis and optimisation. An application of the approach is demonstrated through an industrial case study.Thanks to this approach, effective modifiable characteristics of the product on its performance are determined. Tolerancing can be integrated in design process and its impact on the product performance can be analysed. Quantitative links in product, in process and between product elements and process elements are identified. Uncertainty in the links and every step of modelling can be elicited and managed. This systematic approach gives a pathway to the designer through the design process to make decisions in every level of decomposition based on the required function and cost of manufacturing. The approach is applicable for both modelling an existing product (optimisation approach) and modelling a new product (conceptual design phase).
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Roozbeh Babaeizadeh Malmiry. Managing Complexity and Uncertainty by a Modelling Approach for Decision Making in Integrated Product/Process Design. Mechanical engineering [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2016. English. ⟨NNT : 2016ENAM0035⟩. ⟨tel-01404417⟩

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