Results 31 to 40 of about 14,828 (260)

An Efficient Method for Rotor Aeroacoustic Calculation Accounting for Rotor Downwash Influence

Aerospace
Based on the Ffowcs Williams–Hawkings equations and the computational fluid dynamics method, the rotor’s aeroacoustic characteristics, considering the influence of the downwash flowfield on the sound propagation process, are calculated and analyzed ...
Bo Wang, Xuan Gao, Wei Bian, Xi Chen, Qijun Zhao   +4 more
doaj   +1 more source

Shining light on the aurora's contributions to people: A qualitative study of the aurora borealis in Greenland

People and Nature, EarlyView.
Abstract The aurora borealis (northern lights) is an abiotic natural phenomenon that contributes to human well‐being. There is currently a significant research gap in primary qualitative valuation of the aurora's links to people. This exploratory qualitative study applies the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES ...
James David Broome, David Cook, Brynhildur Davíðsdóttir, Benjamin David Hennig   +3 more
wiley   +1 more source

Characteristics of Shock Wave/Boundary Layer Interactions on Rotor Airfoils

Nanjing Hangkong Hangtian Daxue Xuebao
Utilizing the Reynolds‑averaged Navier‑Stokes （RANS） method in conjunction with a locally variable γ‑Rẽθt transition model， an in‑depth investigation is conducted on the characteristics of shock wave/boundary layer interaction （SWBLI） for the rotor ...
YANG Liuqing, ZHAO Guoqing, WANG Qing, JING Simeng, MA Li, ZHAO Qijun   +5 more
doaj   +1 more source

Erosion Resistance Enhancement in Epoxy Composites by Recycled Rubber: Effect of Rubber Type

Polymer Engineering &Science, EarlyView.
Erosion resistance enhancement in epoxy composites by recycled rubber. ABSTRACT Epoxy‐based materials have low erosion resistance due to their brittle nature, and toughness modification stands out for enhancing it. At this stage, the use of waste rubber as a reinforcement component in the composite system is of interest due to its role in providing ...
Orkan Baran Korkusuz, Şehriban Öncel, Bağdagül Karaağaç, Tamer Sınmazçelik   +3 more
wiley   +1 more source

Combined Machining of Ti-6Al-4V Alloy Using Electrochemical Milling and Electrochemical Grinding

International Journal of Electrochemical Science, 2019
Ti-6Al-4V is a typical difficult-to-cut material with which it is difficult to achieve a high processing efficiency and good surface quality simultaneously using a single processing method.
Gangqiang Liu, Hansong Li, Shen Niu, Xiaokang Yue, Ningsong Qu   +4 more
doaj   +1 more source

Evaluating Testability of Permafrost Models Through Physical and Thermal Testing in Complex Mountain Terrain, Yukon, Canada

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Due to its subsurface nature, permafrost cannot be directly observed with the naked eye or optical remote sensing. Consequently, accurately describing its distribution and thermal state is challenging. This is especially true in vast, remote environments, where obtaining comprehensive field data is demanding or improbable.
Ria Nicholson, Philip P. Bonnaventure, Nick C. Noad, Madeleine C. Garibaldi, Rabecca Thiessen, Will Kochtitzky   +5 more
wiley   +1 more source

Analysis of rotor aeroelastic loads during control ramp increase of helicopter

Hangkong gongcheng jinzhan
Since ramp control is the most prevalent control method in complex helicopter maneuvering scenarios, investigating rotor loads during control ramp increase holds significant guiding importance.
SHAN Yiming, HU Xiaoqing, SHI Yongjie, XU Guohua   +3 more
doaj   +1 more source

Development and Application of Special Extinguishing Agent Concentration Measurement

Hangkong gongcheng jinzhan, 2020
It is necessary to measure the situation of extinguishing agent concentration along with time in the ground simulation test of helicopter/airplane powerplant.
WU Yanyan, YANG Xiaolong, LI Haitao, LUO Tiegou, ZHENG Youlan, MIN Xingming   +5 more
doaj   +1 more source

Internal Structure, Kinematics, and Prehistory of Frozen Debris Lobe‐A (FDL‐A), Brooks Range, Alaska

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Frozen Debris Lobe‐A (FDL‐A)—one of hundreds of FDLs in the Brooks Range of northern Alaska—is a slow‐moving landslide in permafrost that has been the subject of research since 2008 due to its close proximity to the Dalton Highway. Here, we synthesize more than a decade's worth of climate and surface measurements of monitored FDLs, and the ...
Margaret M. Darrow, Esther L. Babcock, Ben A. Leshchinsky   +2 more
wiley   +1 more source

Research on Secondary Condensation Method Based on Substructure Method for Helicopter Tail Boom Model

Aerospace
The tail boom is a critical structural component of a helicopter, and accurately capturing its dynamic characteristics is essential; however, the inherent geometric and material complexity of the tail boom usually leads to large-scale finite element ...
Kunjian Jin, Xu Wang, Guoke Huang, Yingqi Zhang, Guorui Yu, Xiao Wang   +5 more
doaj   +1 more source