Results 131 to 140 of about 94,319 (292)

Experimental assessment of large mammal population estimates from airborne thermal videography

Wildlife Biology, EarlyView.
Wildlife resource management requires reliable, fast, and affordable methods of surveying wildlife populations to develop and adaptively adjust policies. Thermal video from drones can yield high rates of detection over large areas with relative speed and safety.
Julia S. McElhinny, Gregory D. Larsen, Maxwell Messinger, Chad H. Newbolt, Andrew Whitworth, Stephen S. Ditchkoff, Miles R. Silman, Jared T. Beaver   +7 more
wiley   +1 more source

Multipole expansion approach for rotor noise prediction

Journal of Sound and Vibration
This paper presents a frequency-domain model of rotor tonal noise, based on a multipole expansion of the radiated field. The expressions for loading and thickness noise are derived in hovering condition, employing the results of compressible thin airfoil theory.
Felice Fruncillo, Paolo Luchini, Flavio Giannetti   +2 more
openaire   +2 more sources

Helicopter far-field acoustic levels as a function of reduced main-rotor advancing blade-tip Mach number [PDF]

During the design of a helicopter, the weight, engine, rotor speed, and rotor geometry are given significant attention when considering the specific operations for which the helicopter will be used. However, the noise radiated from the helicopter and its
Lemasurier, Philip, Mueller, Arnold W., Smith, Charles D.   +2 more
core   +1 more source

Arc Resistance Enhancement of Converter Transformer Tank Through Structural Improvements: Simulation and Experimental Validation

High Voltage, EarlyView.
ABSTRACT Currently, limited research exists on the structural response and protection methods of the converter transformer tank for ± 800 kV ultra‐high voltage direct current transmission project to high energy arc faults. This research investigates the dynamic response and the vulnerable areas of the ultra‐high voltage converter transformer under the ...
Ke Wang, Shuqi Zhang, Yikun Zhao, Yichen Wang, Zongliang Zhang, Jinhua Zhang   +5 more
wiley   +1 more source

Structureborne noise control in advanced turboprop aircraft [PDF]

Structureborne noise is discussed as a contributor to propeller aircraft interior noise levels that are nonresponsive to the application of a generous amount of cabin sidewall acoustic treatment.
Loeffler, Irvin J.
core   +1 more source

Integrating simultaneous interfacial shear rheology with neutron reflectometry for structural and dynamic analysis of fluid interfacial systems

Journal of Applied Crystallography, EarlyView.
We present a new setup at the FIGARO horizontal neutron reflectometer enabling simultaneous measurement of the structural and mechanical properties of liquid interfaces, combining neutron reflectometry with interfacial shear rheology.The study of the structure and mechanical properties of complex fluid interfaces has attracted growing interest in ...
Pablo Sánchez-Puga, Javier Tajuelo, Javier Carrascosa-Tejedor, Miguel Ángel Rubio, Philipp Gutfreund, Armando Maestro   +5 more
wiley   +1 more source

Rotor-vortex interaction noise [PDF]

A theoretical and experimental study was conducted to develop a validated first principles analysis for predicting noise generated by helicopter main-rotor shed vortices interacting with the tail rotor.
Amiet, R. K., Schlinker, R. H.
core   +1 more source

Sailing Through Time: Building Pacific Maritime Resilience

Global Policy, EarlyView.
ABSTRACT This article examines the Pacific Blue Shipping Partnership (PBSP), an ambitious initiative aimed at decarbonising maritime transport across Oceania. The study explores the cultural, historical and technological aspects of wind‐propelled shipping in the Pacific.
Christiaan De Beukelaer, John Taukäve, Maria Sahib, Eldine Glees, Aseri Driu, Joshua Lakabung, Atina Schutz, Joseph H. Genz, Shania G. Tamagyongfal, Jerolynn K. Myazoe, Alexander Mawyer, Alson Kelen, Larry Raigetal, Raffael Held, Andrew Irvin, Morgan Wairiu, Peter Nuttall, Transform Aqorau, Kyrie Lalauvaki, Aileen Sefeti, John Kautoke   +20 more
wiley   +1 more source

Influence of vane sweep on rotor-stator interaction noise [PDF]

The influence of vane sweep in rotor-stator interaction noise is investigated. In an analytical approach, the interaction of a convected gust representing the rotor viscous wake, with a cascade of cascade of finite span swept airfoils, representing the ...
Envia, Edmane, Kerschen, Edward J.
core   +1 more source

In situ aerial bioacoustic monitoring from extremely noisy drone recordings

Methods in Ecology and Evolution, EarlyView.
Abstract Aerial bioacoustic monitoring has the potential to transform biodiversity surveys by enabling rapid acoustic sampling across large and inaccessible habitats. However, its application from unmanned aerial vehicles (UAVs) has remained limited because strong rotor self‐noise overwhelms target sounds such as bird vocalisations, compromising the ...
Lin Wang, Michael Clayton, Axel G. Rossberg   +2 more
wiley   +1 more source