Incorporating Tolerances into Qualitative Reliability Models
DS 133: Proceedings of the 35th Symposium Design for X (DFX2024)
Year: 2024
Editor: Dieter Krause; Kristin Paetzold-Byhain; Sandro Wartzack
Author: Lukas Kleinhans; Jiahang Li; Patric Grauberger; Sven Matthiesen
Series: DfX
Institution: Institute of Product Engineering, Karlsruhe Institute of Technology, Germany
Page(s): 182-191
DOI number: 10.35199/dfx2024.19
Abstract
Reliability of products is important to remain ahead in today’s highly competitive markets. Especially in products such as power tools, that are used in highly individual tasks in partially extreme environments, it becomes a main selling criterion. Qualitative reliability models are used to assess function-related reliability. The research problem is that state-of-the-art qualitative models do not take the complete influence of tolerances into account. The aim of this paper is to incorporate tolerances into qualitative reliability models. For this purpose, the methods of the Embodiment Function Relation and Tolerance model (EFRT model) and the sequence model are linked to derive the qualitative reliability model. This approach is illustrated using the example of a cordless drill and supports early reliability assessment.
Keywords: qualitative reliability model, tolerances, power tool, EFRT model