Jan Würtenberger

Comparison of a New Passive and Active Technology for Vibration Reduction of a Vehicle under Uncertain Load

This paper presents two new technologies in order to optimize the operation of a con-ventional spring-damper-system. Therefore, the function structure such as the energy flow of a con-ventional system is investigated and optimized. The first resulting technology is the fluid dynamicabsorber (FDA) which is still a passive solution and improves the energy flow of the conventionalspring-damper-system with the help of an absorber with a hydraulic transmission. The second tech-nology is the active air spring damper (AASD) which is an active variant of a spring-damper-systemand optimizes the energy flow by using electrical energy. We use a quarter car model to examine theperformance of our technologies and compare them in the conflict diagram where driving comfort vs.driving safety is shown within the scope of uncertainty. The FDA improves the driving safety at almostthe same comfort. The driving comfort is improved by using the AASD. We also examine the systembehavior at uncertain loads. The results show that they are capable of controlling this uncertainty.

Uncertainty in Product Modelling within the Development Process

This paper gives an overview about how to locate uncertainty in product modelling within the development process. Therefore, the process of product modelling is systematized with the help of characteristics of product models and typical working steps to develop a product model. Based on that, it is possible to distinguish between product modelling uncertainty, mathematic modelling uncertainty, parameter uncertainty, simulation uncertainty and product model uncertainty.

Representation of Human Behaviour for the Visualization in Assembly Design

This article extends the Uncertainty Mode and Effects Analysis (UMEA) to human effects and uses ontologies to connect human driven uncertainty data to the corresponding parts in an aircraft CAD-Assembly. Still, human behaviour is one of the major sources of uncertainty in the product usage phase. Hence, using uncertainty data of human behaviour for product design becomes increasingly important, especially for the control of uncertainty in load carrying systems. In this context, the exchange of semantically enriched uncertainty data between different domains and domain specific applications guarantees the consistency of the data prevents misinterpretation and enables the reuse of existing data for future design decisions.

An Approach to Using Elemental Interfaces to Assess Design Clarity

The authors propose a method to assess the clarity of a design on working principle level. To do so, the Contact and Channel Model is used in an adapted form to differentiate elemental interfaces based on their geometry and function. This classification is used to derive a generic catalogue of elemental interfaces. A product can be represented through a combination of these interfaces and working structures in between. The design clarity can then be assessed through generic information stored in the catalogue. The authors propose a procedure model to implement this method and show exemplarily its applicability. Additionally, main design parameters that strongly affect a product’s behavior can be identified with help of the generic catalogue for every elemental interface. Finally, further steps regarding variability in design parameters are discussed.