Conceptual design studies of vertical takeoff and landing remotely piloted aircraft systems for hybrid missions

2015 ◽  
Vol 7 (1) ◽  
pp. 135-148 ◽  
Author(s):  
S. Herbst ◽  
G. Wortmann ◽  
M. Hornung
2021 ◽  
Author(s):  
Álvaro Gómez-Rodríguez ◽  
María Poveda-Villalón ◽  
Raúl García-Castro ◽  
Asunción Gómez-Pérez ◽  
Cristina Cuerno-Rejado

2019 ◽  
Vol 90 ◽  
pp. 368-387 ◽  
Author(s):  
Álvaro Gómez-Rodríguez ◽  
Alejandro Sanchez-Carmona ◽  
Luis García-Hernández ◽  
Cristina Cuerno-Rejado

2021 ◽  
pp. 1-14
Author(s):  
Hiroaki Kobayashi ◽  
Yusuke Maru ◽  
Matthew P. Richardson ◽  
Kiyoshi Kinefuchi ◽  
Tetsuya Sato

2021 ◽  
Vol 13 (2) ◽  
pp. 171
Author(s):  
Kevin W. Turner ◽  
Michelle D. Pearce ◽  
Daniel D. Hughes

Ice-rich permafrost landscapes are sensitive to ongoing changes in climate. Permafrost retrogressive thaw slumps (RTSs) represent one of the more abrupt and prolonged disturbances, which occur along Arctic river and lake shorelines. These features impact local travel and infrastructure, and there are many questions regarding associated impacts on biogeochemical cycling. Predicting the duration and magnitude of impacts requires that we enhance our knowledge of RTS geomorphological drivers and rates of change. Here we demonstrate the utility of remotely piloted aircraft systems (RPAS) for documenting the volumetric change, associated drivers and potential impacts of the largest active RTS along the Old Crow River in Old Crow Flats, Yukon, Canada. RPAS surveys revealed that 29,174 m3 of sediment was exported during the initial evacuation in June 2016 and an additional 18,845 m3 continued to be exported until June 2019. More sediment export occurred during the warmer 2017 summer that experienced less cumulative rainfall than summer 2018. However, several rain events during 2017 were of higher intensity than during 2018. Overall mean soil organic carbon (SOC) and total nitrogen (TN) within sampled thaw slump sediment was 1.36% and 0.11%, respectively. A combination of multispectral, thermal and irradiance (derived from the RPAS digital surface model) data provided detailed classification of thaw slump floor terrain types including raised dry clay lobes, shaded and relatively stable, and low-lying evacuation-prone sediments. Notably, the path of evacuation-prone sediments extended to a series of ice wedges in the northern headwall, where total irradiance was highest. Using thaw slump floor mean SOC and TN values in conjunction with sediment bulk density and thaw slump fill volume, we estimated that 713 t SOC and 58 t TN were exported to the Old Crow River during the three-year study. Findings showcase the utility of high-resolution RPAS datasets for refining our knowledge of thaw slump geomorphology and associated impacts.


2021 ◽  
Vol 1786 ◽  
pp. 012021
Author(s):  
K. A. Lukin ◽  
V. I. Prisiazhnyi ◽  
Y. A. Mitikov ◽  
A. S. Levenko ◽  
S. K. Lukin ◽  
...  

Joule ◽  
2021 ◽  
Author(s):  
Xiao-Guang Yang ◽  
Teng Liu ◽  
Shanhai Ge ◽  
Eric Rountree ◽  
Chao-Yang Wang

2018 ◽  
Vol 55 (2) ◽  
pp. 454-474 ◽  
Author(s):  
Russell M. Cummings ◽  
Carsten M. Liersch ◽  
Andreas Schütte ◽  
Kerstin C. Huber

2016 ◽  
Vol 842 ◽  
pp. 251-258 ◽  
Author(s):  
Muhammad Rafi Hadytama ◽  
Rianto A. Sasongko

This paper presents the flight dynamics simulation and analysis of a tilt-rotor vertical takeoff and landing (VTOL) aircraft on transition phase, that is conversion from vertical or hover to horizontal or level flight and vice versa. The model of the aircraft is derived from simplified equations of motion comprising the forces and moments working on the aircraft in the airplane's longitudinal plane of motion. This study focuses on the problem of the airplane's dynamic response during conversion phase, which gives an understanding about the flight characteristics of the vehicle. The understanding about the flight dynamics characteristics is important for the control system design phase. Some simulation results are given to provide better visualization about the behaviour of the tilt-rotor. The simulation results show that both transition phases are quite stable, although an improved stability can give better manoeuver and attitude handling. Improvement on the simulation model is also required to provide more accurate and realistic dynamic response of the vehicle.


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