| 研究課題/領域番号 |
18K13693
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| 研究機関 | 国立研究開発法人海洋研究開発機構 |
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研究代表者 |
Kolomensk Dmitry 国立研究開発法人海洋研究開発機構, 地球情報基盤センター, 特任研究員 (00813924)
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| 研究期間 (年度) |
2018-04-01 – 2021-03-31
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| キーワード | insect flight / bio-inspired flight / HPC |
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| 研究実績の概要 |
A spring-damper model has been constructed upon micro-CT morphological measurements of bumblebees. Parameter search to determine the stiffness, damping, and the neutral angle has been carried out for the hovering flight conditions using a computational fluid dynamics (CFD) approach (Kolomenskiy et al. 2019, J Fluids Struct, accepted manucript). Extension of this model for forward and maneuvering flight is in progress. Since simulation of controlled maneuvering requires much longer unsteady time series, it will be performed using a quasi-steady model. Its development is in progress, and on the current stage this work has led to a versatile reduced-order model of leading-edge vortices on rotary wings (Chen et al. 2018, Phys Rev Fluids 3:114703). Processing and analysis of the previously collected experiment data on bumblebee maneuvering under unsteady wing conditions has been finalized considering the body dynamics (Jakobi et al. 2018, Biol Open 7: bio034074), although there remain video recordings of the wing motion that may be tracked later in this project. The mechanical destabilizing effect of turbulence scale and intensity has been studied numerically using an uncontrolled model (Engels et al. 2019, Phys. Rev. Fluids 4:013103).
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The work done during the first year relied largely on the previously collected data, that explains why it was possible to follow the original plan closely, estimate the amount of work the required time accurately.
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| 今後の研究の推進方策 |
A controller will be constructed on the basis of the maneuvering dynamics observed in previous biological experiments. Simplified phenomenological biomimetic sensorimotor models will be hypothesized. Numerical simulations of controlled free flight in perturbed air environment will be implemented using CFD-informed quasi-steady aerodynamic modelling. Reinforcement machine learning will be attempted as a control decision model. Optimal state-action policies will be obtained for each hypothesized sensorimotor model and a selected reward function. Simulated optimal trajectories in the phase plane will be compared with those observed in experiments, in order to identify the biologically relevant policies. In addition, the importance of wing deformation will be evaluated using CFD coupled with a mass-spring model of flexible wings and shoulder hinges. Thus, the effect of wing venation on maneuvering and stability will be studied. The results will be used to explain the variability of wing kinematics observed in earlier experiments, and to make recommendations regarding possible engineering application.
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| 次年度使用額が生じた理由 |
The results obtained during the first year will lead to several journal publications in the next year. Therefore, open access publication fees will constitute a significant part of the expenses. Two of three international travels are planned, including an IUTAM symposium on vortex dynamics in June 2019, APS-DFD meeting in November 2019 and SICB annual meeting in January 2020. In November, it is planned to invite international collaborators from TU Berlin. It is planned to buy additional external hard disk drives for data storage.
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