Stefan Kemmler

• Doctor of Engineering
• Group Leader at Bosch

The derivation of shaker profiles, based on vehicle measurements, needs manually adapted iterations due to different dynamical, nonlinear system behavior of components in vehicles or test benches. Targeting a similar dynamical behavior of the interesting component either mounted in a vehicle or on an assembly / component test, a representative exci...

The Moving Least Squares (MLS) method has been established in the context of regression analysis for the mathematical description of a non-linear relationship. Compared to the Ordinary Least Squares (LS) method, it takes known points in the region of a desired point into greater consideration (weighted). Therefore this approach allows to model non-...

Conventional methods of Robust Design are largely used for variance consideration, which may potentially occur during the product use. Therefore, these methods do not provide accurate information about the temporal behavior of the changing product properties and requirements. However, in order to describe accurate life predictions with regard to th...

Die Sicherstellung einer von Kundenseite gewünschten hohen Zuverlässigkeit erfordert im Zeitalter der Industrie 4.0 und der zunehmenden Komplexität der Systeme eine ständige Weiterentwicklung bekannter Ansätze. Letztendlich muss die Zuverlässigkeit eines Produktes über den gesamten Produktlebenslauf betrachtet werden und beherrschbar sein. Derzeiti...

If the focus during product development is on estimating a failure distribution function or a lifetime-quantile, analysis of failure behavior or determination of optimal design alternatives, there is often no alternative to life tests until failure. Alongside the determination of sample size for a desired accuracy of the result, engineers are also...

Current research and development have been trending towards approaches based on simulation and virtual testing. Industrial development processes for complex products employ optimization methods to ensure results are close to reality, simultaneously minimizing required resources. The results of virtual testing are optimized in accordance with requir...

In today’s efficient development of technical products the tendencies and challenges shift to simulative computer aided engineering. Therefore in the industrial development of complex technical products, methods are applied which provide realistic results and simultaneously economize the required re-sources. These results become purposefully optimi...

Verschiedene Kunden belasten gleiche Produkte im Feld höchst unterschiedlich. Damit alle Kunden die gleiche Zuverlässigkeit genießen können, sind Bauteile für den Einzelnen oft überdimensioniert. Bosch und das Institut für Maschinenelemente der Universität Stuttgart haben eine Online-Betriebsstrategie entwickelt, mit der die Zuverlässigkeit im Fahr...

SMAR²T is based on established methods (Axiomatic Design and the Taguchi Method) and applies VDI2221 as a chronology. Hence, SMAR²T refers to already successfully applied methods and experiences. Compared to the known and established methods, SMAR²T goes even further by adapting and combining these methods to a holistic approach with adaptive entry...

Commonly, the terms reliability and robustness are used to describe products and processes, which are in accordance with the customer requirements and fulfil high quality expectations. However, significant differences between the underlying definitions raise the questions how reliable robust products are and vice versa. For a comprehensive understa...

Today’s product requirements demand an ever increasing functionality for the same space and usually the same number of components. Thereby, the quality, reliability and robustness of these products should be preserved or even be increased. This target conflict cannot be solved without compromises. The research community between the Institute of Mac...

Qualitativ oder quantitativ - wer seine Systeme untersuchen und Ausfallwahrscheinlichkeiten berechnen will, muss sich meist entscheiden. Ein Forschungsprojekt des Instituts für Maschinenelemente der Universität Stuttgart hat die energiebasierten Zuverlässigkeitsanalyse entwickelt, die beide Aspekte vereint und zudem die thermischen Bauteilwechselwi...

Products have to ensure their function under the influence of internal and external noise factors in order to remain competitive in the current market. Therefore the step of designing robust products should be integrated in early stages of the Product Development Process (PDP). Robust products are developed using the Robust Design Method SMART (Sys...

Product requirements grow with customer requirements. Thus, systems be-come more complex, but the demands for quality, reliability, safety and energy efficiency increase. In order to meet these requirements, the priority must be on the designing of robust and reliable products and their Design Parameters (DP) in the Product Development Process (PDP...

SMART (Systematic Method for Axiomatic Robustness-Testing) is a method for the development of robust and reliable products. It combines elements from the robust design methodology with a holistic approach by using Axiomatic Design (AD) and the Taguchi Method (TM). These two methods were established and expanded by N.P. Suh [1990] (AD) and G. Taguch...

SMART (Systematic Method for Axiomatic Robustness-Testing) is a method for the development of robust and reliable products. It combines elements from the robust design methodology with a holistic approach by using Axiomatic Design (AD) and the Taguchi Method (TM). These two methods were established and expanded by N.P. Suh [1990] (AD) and G. Taguch...

The interactions between components in mechatronic systems play a crucial role on the components’ load. This indispensably demands the consideration of these interactions regarding a reliability analysis. In order to identify such interactions a method complementing already existing and well established system analyses is needed. The method present...

Die Nutzungshäufigkeit von Funktionen mechatronischer Produkte hat Einfluss auf die Schädigung der darin enthaltenen Komponenten und Bauteile. Um die Verfügbarkeit sicherheitskritischer oder gesetzlich geforderter Grundfunktionen zu jedem Zeitpunkt zu gewährleisten, kann die Verfügbarkeit von Zusatzfunktionen bei dro-hender Überbelastung reduziert...