First-Principles Modeling of A Miniature Tilt-Rotor Convertiplane in Low-Speed Operation

Transition Flight Demonstration of a Quin Tilt-Rotor UAV in the Low Speed Wind Tunnel

10.1007/978-981-16-7423-5_83 ◽

2021 ◽

pp. 828-840

Author(s):

Nie Bowen ◽

Yang Hongsen ◽

Guo Tianhao ◽

Ren Zhongcai ◽

Liu Zhitao

Keyword(s):

Wind Tunnel ◽

Low Speed ◽

Tilt Rotor ◽

Low Speed Wind Tunnel ◽

Transition Flight

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Model Predictive Control Design for Tilt-Rotor Aircraft at Low Speed Flight*

2020 IEEE 16th International Conference on Control & Automation (ICCA) ◽

10.1109/icca51439.2020.9264481 ◽

2020 ◽

Author(s):

Biao Wang ◽

Meng Wu ◽

Chaoying Tang ◽

Chunsheng Liu

Keyword(s):

Model Predictive Control ◽

Predictive Control ◽

Control Design ◽

Low Speed ◽

Tilt Rotor

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Analysis of Low-speed Flight Characteristics for a Tilt-rotor UAV

The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) ◽

10.1299/jsmermd.2019.1p2-n07 ◽

2019 ◽

Vol 2019 (0) ◽

pp. 1P2-N07

Author(s):

Hiroki YUBA ◽

Daisuke KAWANO ◽

Takateru URAKUBO ◽

Masafumi MIWA

Keyword(s):

Low Speed ◽

Tilt Rotor

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Instabilities of Nonreturn Valves in Low-Speed Air Systems

Journal of Fluids Engineering ◽

10.1115/1.2969746 ◽

2008 ◽

Vol 130 (12) ◽

Cited By ~ 1

Author(s):

Mark Potter ◽

Marko Bacic ◽

Phil Ligrani ◽

Matthew Plackett

Keyword(s):

State Space ◽

First Principles ◽

State Space Model ◽

Oscillatory Behavior ◽

Flow Properties ◽

Low Speed ◽

Space Model ◽

Air Volume ◽

Aero Engine ◽

Nonlinear State

Practical observations of the nonreturn valve wear in aero-engine cabin-bleed systems suggest that such valves are subject to unstable behavior. A theoretical model for the prediction of nonreturn valve instabilities in air systems is proposed and a nonlinear state-space model of the nonreturn valve and air volume interaction is derived from first principles. Experimental work is used to identify both the dynamic characteristics and the flow properties of the valve, which are used to identify the coefficients within the model. Through frequency analysis of valve oscillatory behavior, the levels of damping within the system are identified. Finally, using a local linearization of the state-space model an explicit mathematical prediction of valve stability is derived based on system parameters. These predictions are used to generate a map of the transition from stable to unstable system behavior for low-speed air flow, which is in excellent agreement with experimental data.

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Review on Dynamic Modeling of Tilt-Rotor UAVs in Low Speed Flight

2018 International Conference on Sensing,Diagnostics, Prognostics, and Control (SDPC) ◽

10.1109/sdpc.2018.8664771 ◽

2018 ◽

Cited By ~ 1

Author(s):

Weizhou Liu ◽

Guang He ◽

Huangchao Yu ◽

Tengxiang Li ◽

Jiyang Zhang

Keyword(s):

Dynamic Modeling ◽

Low Speed ◽

Tilt Rotor

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Tilt rotor aeromechanics phenomena in low speed flight

2004 Users Group Conference (DOD_UGC'04) ◽

10.1109/dod_ugc.2004.46 ◽

2004 ◽

Cited By ~ 10

Author(s):

M.A. Potsdam ◽

M.J. Silva

Keyword(s):

Low Speed ◽

Tilt Rotor

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New ultrastructural findings about Borrelia burgdorferi by cryofixation, negative staining, thin sectioning and scanning techniques

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100160467 ◽

1990 ◽

Vol 48 (3) ◽

pp. 582-583

Author(s):

S. F. Hayes ◽

M. D. Corwin ◽

T. G. Schwan ◽

D. W. Dorward ◽

W. Burgdorfer

Keyword(s):

Lyme Disease ◽

Borrelia Burgdorferi ◽

Structural Characterization ◽

Negative Staining ◽

Low Speed ◽

Thin Sectioning ◽

Ultrastructural Findings

Characterization of Borrelia burgdorferi strains by means of negative staining EM has become an integral part of many studies related to the biology of the Lyme disease organism. However, relying solely upon negative staining to compare new isolates with prototype B31 or other borreliae is often unsatisfactory. To obtain more satisfactory results, we have relied upon a correlative approach encompassing a variety EM techniques, i.e., scanning for topographical features and cryotomy, negative staining and thin sectioning to provide a more complete structural characterization of B. burgdorferi.For characterization, isolates of B. burgdorferi were cultured in BSK II media from which they were removed by low speed centrifugation. The sedimented borrelia were carefully resuspended in stabilizing buffer so as to preserve their features for scanning and negative staining. Alternatively, others were prepared for conventional thin sectioning and for cryotomy using modified procedures. For thin sectioning, the fixative described by Ito, et al.

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