Flight Dynamics of Unmanned Helicopter without Stabilizer-bar at Low-Speed Flight

2016 ◽  
Vol 64 (4) ◽  
pp. 236-243
Author(s):  
Akira SATO ◽  
Hiroaki NAKANISHI ◽  
Hirohisa OKAWA
Keyword(s):  
Flight Dynamics ◽  
Unmanned Helicopter ◽  
Low Speed

Stability Features of the Saucer-Shaped Blend-Wing-Body Aircraft

2013 ◽  
Vol 712-715 ◽  
pp. 1307-1311
Author(s):  
Lin Lin Wang ◽  
Ge Gao
Keyword(s):  
Perturbation Theory ◽  
Longitudinal Mode ◽  
Flight Dynamics ◽  
Aerodynamic Characteristics ◽  
Linear Perturbation ◽  
Low Speed ◽  
Similarities And Differences ◽  
Linear Perturbation Theory ◽  
Dutch Roll ◽  
Directional Flight

The saucer-shaped aircraft is a novel aircraft adopting blend-wing-body configuration. The linear perturbation theory based on the classic flight dynamics was used to analyze the longitudinal, lateral and directional flight qualities of the saucer-shaped aircraft under low speed conditions. The flight qualities were given. Meanwhile the aerodynamic characteristics of the saucer-shaped aircraft, the conventional aircraft and the flying wing aircraft were also contrasted to discuss their similarities and differences. The results show that the saucer-shaped aircraft has stable longitudinal mode, rollover mode and Dutch roll mode. The spiral mode is unstable. The saucer-shaped aircraft exhibits superior flight qualities and excellent comprehensive performances.

An Integrated Low-Speed Aeroelastic-Flight-Dynamics Framework for Modeling Supersonic Aircraft

2022 ◽  
Author(s):  
Thiago A. Guimarães ◽  
Carlos E. Cesnik ◽  
Ilya V. Kolmanovsky
Keyword(s):  
Flight Dynamics ◽  
Low Speed ◽  
Supersonic Aircraft

Design of the Flight Control System for a Small-Scale Helicopter

2013 ◽  
Vol 380-384 ◽  
pp. 459-462
Author(s):  
Yu Hu Du ◽  
Jian Cheng Fang
Keyword(s):  
Control System ◽  
Flight Control ◽  
Small Scale ◽  
Unmanned Helicopter ◽  
Flight Control System ◽  
Low Speed ◽  
Ground Station ◽  
Aerial Vehicles ◽  
Small Scale Helicopter

Compared with the fixed-wing aerial vehicles, small-scale unmanned helicopter (SUH) has the advantages of taking off and landing vertically, cruising under ultra low speed, and sustained hovering in the air. SUH has properties of nonlinear, unstable, strongly coupling, and applying control system for SUH is considered as a challenging task. This paper presents the design of the flight control system for a SUH. This flight control system consists of two parts, namely, ground station and onboard part. Various experiments have been conducted to test the performance of this flight control system, and some of the results are presented at the end.

Stabilizer-bar's Effect on Flight Dynamics of Unmanned Helicopter

2015 ◽  
Vol 63 (2) ◽  
pp. 68-76
Author(s):  
Akira SATO ◽  
Hiroaki NAKANISHI ◽  
Hirohisa OKAWA
Keyword(s):  
Flight Dynamics ◽  
Unmanned Helicopter

scholarly journals Low-speed optic-flow sensor onboard an unmanned helicopter flying outside over fields

2013 ◽  
Author(s):  
Guillaume Sabiron ◽  
Paul Chavent ◽  
Thibaut Raharijaona ◽  
Patrick Fabiani ◽  
Franck Ruffier
Keyword(s):  
Optic Flow ◽  
Flow Sensor ◽  
Unmanned Helicopter ◽  
Low Speed

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

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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