Successful organizational change requires substantial efforts from both the leaders and recipients of change. After a long tradition of focusing on change leaders, academics now increasingly focus on the role of change recipients. The current literature on recipients, however, offers mostly binary categorizations of their roles in change (e.g., supportive vs. unsupportive) obtained from questionnaires. Such an approach does not reveal how events can cause shifts in recipients’ role taking during a change initiative. Actors’ roles change and are changed by change events. We adopted an assisted sensemaking approach using a narrative methodology to study recipients’ various storylines by which they construct and reconstruct their own multiple roles throughout change. Eighty participants were asked to tell the retrospective story of their experience of, and role taking in, a top-down change initiative as if they were crafting chapters of a book. Analysis and classification of these individual stories yielded five underlying composite narratives, each representing typical shifts in perceived role taking by recipients during a change initiative. This study highlights and illustrates how recipients’ role taking is a complex, adaptive, and social process.
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The inefficiency of maintaining static and long-lasting safety zones in environments where actual risks are limited is likely to increase in the coming decades, as autonomous systems become more common and human workers fewer in numbers. Nevertheless, an uncompromising approach to safety remains paramount, requiring the introduction of novel methods that are simultaneously more flexible and capable of delivering the same level of protection against potentially hazardous situations. We present such a method to create dynamic safety zones, the boundaries of which can be redrawn in real-time, taking into account explicit positioning data when available and using conservative extrapolation from last known location when information is missing or unreliable. Simulation and statistical methods were used to investigate performance gains compared to static safety zones. The use of a more advanced probabilistic framework to further improve flexibility is also discussed, although its implementation would not offer the same level of protection and is currently not recommended.
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The dynamic inflow effect denotes the unsteady aerodynamic response to fast changes in rotor loading due to a gradual adaption of the wake. This does lead to load overshoots. The objective of the paper was to increase the understanding of that effect based on pitch step experiments on a 1.8 m diameter model wind turbine, which are performed in the large open jet wind tunnel of ForWind – University of Oldenburg. The flow in the rotor plane is measured with a 2D laser Doppler anemometer, and the dynamic wake induction factor transients in axial and tangential direction are extracted. Further, integral load measurements with strain gauges and hot-wire measurements in the near and close far wake are performed. The results show a clear gradual decay of the axial induction factors after a pitch step, giving the first direct experimental evidence of dynamic inflow due to pitch steps. Two engineering models are fitted to the induction factor transients to further investigate the relevant time constants of the dynamic inflow process. The radial dependency of the axial induction time constants as well as the dependency on the pitch direction is discussed. It is confirmed that the nature of the dynamic inflow decay is better described by two rather than only one time constant. The dynamic changes in wake radius are connected to the radial dependency of the axial induction transients. In conclusion, the comparative discussion of inductions, wake deployment and loads facilitate an improved physical understanding of the dynamic inflow process for wind turbines. Furthermore, these measurements provide a new detailed validation case for dynamic inflow models and other types of simulations.
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