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Optimisation of the requirement-oriented product development by a functions differentiation within a holistic system description

A modern, requirement-oriented product development does not only have to assure being on time and on costs, it must also assure that it is on quality in order to keep up with competitors. Systems engineering approaches support this quality assurance, e.g. by showing cause and effects relationships. One main aspect of systems engineering has been identified in the use of a system model that depicts all system elements (requirements, functions, components, processes) and that especially focuses on a precise functions differentiation. The authors introduce an approach on how a precise functions differentiation – differentiating between target functions, disturbance functions and compensation functions – within holistic system modelling can facilitate the design of better, i.e. more reliable and innovative technical products, giving the example of the KitVes kite-steering unit, whose product development was supported using the demand-compliant design (DeCoDe) method. All steps of the functions differentiation are presented and filed into the system model of DeCoDe. Furthermore, interdependencies between other system elements are pointed out. Finally, advantages and research limitations of the approach are discussed.