טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentYael Gilboa
SubjectAlgorithms for Multicriteria Priorities of Concepts in
Engineering Design
DepartmentDepartment of Quality Assurance and Reliability
Supervisors Professor Weiss Menachem
Ms. Cohen Ayala (Deceased)


Abstract

   The synthesis of solution principles into full concepts is probably the most important step in the conceptual design. It is based on the morphological map and involves selecting a combination of solution principles- one for each sub-function. Consequently, a very large number of combinations is possible. Obviously the best combinations are searched for. To find intuitively such optimal combinations is a difficult task. Therefore potentially good solutions can be skipped. In the current study, a technique to find 10 to 20 preferred conceptual alternatives, without an excessive effort, has been seeked and developed. This set is later analyzed and evaluated by the project team that chooses the best alternative.

      Two methods are introduced for improving the synthesis sub-stage. They were built as part of the ICDM - Integrated, Customer Driven, Conceptual Design Method, but are general and applicable for any morphological-map-based conceptual design. Both algorithms are based on the know-how acquired by the team members. The difference is in the way they achieve the goal. For the first algorithm, the team members evaluate the quality of each of the solution principles and the compatibility between each pair of solution principles belonging to different sub-functions. For the second algorithm, a sample of full combinations, chosen according to methods of design of experiments, has to be evaluated.   

   The tools are easily applicable by the development team. The effort required to run the algorithms is moderate, compared to the present non-algorithmic activity. Similar and good  combination sets have been achieved by both methods. The preference between the methods is left to the choice of the product-development-teams.