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Identification and Empirical Investigation of Movement Strategies for Workstation Design
No full textThis study investigates movement strategies in assembly workstations to improve ergonomic design. Movement strategies, defined as sequences of actions performed repeatedly by specific groups in specific situations, have been understudied in assembly contexts. An inductive approach was used to build a theoretical base that included knowledge, unconscious actions and hand dominance. Twenty participants performed standardized assembly tasks in standing and sitting positions, with hand and leg movements observed and qualitatively analyzed. Results revealed primary, secondary and individual movement strategies, such as right-handed participants consistently grasping objects from the right side. Future research will investigate the transferability of the identified strategies to virtual reality environments, extending their application to virtual ergonomics and simulation-based workstation design. This study contributes to the growing body of knowledge in human factors and ergonomics and provides a novel approach to optimizing human-centered manufacturing environments
Analysis on industrial framework conditions for a holistic system development process
No full textThis paper summarises the results of the project “Hyper” (Holistic System Development Process) and provides a foundation for future research. The project analyses the development process for product-service systems (PSS), taking into account boundary conditions and influencing factors. The aim of the project was to clarify the needs of a holistic approach, how it can support the innovation and development of PSS and which industries could benefit most from it. Data was collected through 14 expert interviews in the manufacturing industry and a consolidation and systematic workshop, in order to develop a framework that comprehensively defines boundary conditions for an ideal PSS development process
Experimental Evaluation of Purge Strategies in the Recirculation Path of a PEM Fuel Cell System
No full textPEM fuel cell technology plays a vital role in realizing an emission-free mobility and, depending on the considered use case, offers significant advantages over battery electric solutions as well as hydrogen combustion engines. When high performance over a longer period of time as well as short refueling times are key requirements, fuel cell powertrains show their core strengths. However, the adaption of fuel cells in the mobility sector strongly depends on their efficiency which directly relates to the vehicle’s fuel consumption, range and ultimately cost to operate. Therefore, the influence on efficiency and power of different purge strategies used to operate PEM fuel cells is experimentally investigated and compared. A concentration-dependent purge strategy is developed and examined in reference to a charge-dependent strategy. The measurements are carried out on a fuel cell system test bench which corresponds to a fully functional fuel cell system including all commonly used peripheral components. In the range investigated, both purge strategies show similar values regarding the analyzed utilization coefficients and power. However, for the maximum fuel cell current examined, the concentration-dependent purge strategy achieved slightly higher utilization coefficients while showing a minimally lower power output. Taking this into account, further research regarding the optimization of concentration-dependent purge strategies appears promising. For the time being, the decision between using a charge-dependent or a concentration-dependent purge strategy foremost relies on the presence of a suitable hydrogen concentration sensor.</div</di
