Výsledky vyhledávání - "Hermann Lehmann"

About the impact of wind turbine blade tip vortices on helicopter rotor trim and rotor blade motion

Autor: Berend G. van der Wall, Paul Hermann Lehmann

Publikováno v: CEAS Aeronautical Journal. 9:67-84

With increasing numbers of large wind turbines on-shore and off-shore, interactions of their wake with helicopters become a subject worth investigating. In this paper, the wake is modeled as a tip vortex helix with a vortex strength estimated from th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b00e94003d1d8671d0046a42445cf53
https://doi.org/10.1007/s13272-017-0276-x

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Patching Deep Neural Networks for Nonstationary Environments

Autor: Sebastian Kauschke, David Hermann Lehmann, Johannes Fürnkranz

Publikováno v: IJCNN

In this work we present neural network patching, an approach for adapting deep neural network models to nonstationary environments. Instead of creating or updating a network to accommodate concept drift, neural network patching leverages the inner la

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::794ee442ed83801699243d553a0ba859
https://doi.org/10.1109/ijcnn.2019.8852222

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Wind Turbine Wake Vortex Influence on Helicopter Rotor Trim

Autor: B. G. van der Wall, Paul Hermann Lehmann

Publikováno v: Notes on Numerical Fluid Mechanics and Multidisciplinary Design ISBN: 9783319645186

The wake of wind turbines is modeled as a tip vortex helix with a vortex strength estimated from its rotor thrust. A Bo105 helicopter and an analytical isolated rotor model are subjected to the wake. In both cases the trim perturbations generated by

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::14d3a327f7b33bbe701645202d16aa82
https://doi.org/10.1007/978-3-319-64519-3_36

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Impact of Turbulence and Degraded Visual Environment on Pilot Workload

Autor: Michael Jones, Marc Höfinger, Paul Hermann Lehmann

Offshore helicopter operations are frequently conducted in both turbulent and degraded visual environments (DVE). This investigation assesses the combined influence of turbulence and DVEs on pilot workload to identify first limits for safe operations

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::225dde95cf8c4d50c578548f0dd5cbc3
https://elib.dlr.de/106100/

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