Results 51 to 60 of about 14,828 (260)

Review of coupled rotor-fuselage dynamics design methodology for coaxial rigid rotor helicopter

Hangkong gongcheng jinzhan
The coaxial rigid rotor configuration offers compact design, high hover efficiency, and high-speed potential, but its coupled rotor-fuselage dynamics remain a key bottleneck. This paper reviews progress and challenges in three areas: theoretical modeling,
GAO Xiaodong, CHENG Qiyou, CHEN Hao, LIANG Kun, YIN Peng   +4 more
doaj   +1 more source

THE EFFECT OF DIFFERENT OPTIONS OF BLADES MAIN ROTOR ON THE X-SHAPED TAIL ROTOR OF THE MI-171 LL

Научный вестник МГТУ ГА, 2018
This paper describes the effect of different rotor blades on the X-shaped tail rotor of the Mi-171 LL, observed conducting flight tests. The tests were carried out on the same helicopter in the similar atmospheric conditions.The objective of the tests ...
V. A. Ivchin, V. A. Nikiforov, K. Yu. Samsonov   +2 more
doaj   +1 more source

Central Bank Digital Currencies, Financial Inclusion, and Privacy: A Normative Perspective

Southern Economic Journal, EarlyView.
ABSTRACT Central bank digital currencies (CBDCs) are a digital form of a nation's money, issued by its central bank. As opposed to other forms of digital money, such as electronic bank balances or cryptocurrencies, they are centrally managed legal tender.
Andrew Allison, Alexander William Salter
wiley   +1 more source

Design of Swarm Intelligence Control Based on Double-Layer Deep Reinforcement Learning

Applied Sciences
Traditional methods have limitations regarding efficient collaboration and dynamic response in complex dynamic environments. Although existing swarm intelligence control methods possess certain adaptive optimization capabilities, they still face ...
Xiangpei Yan, Guorui Yu, Guoke Huang, Ruchuan Zhou, Liu Hao   +4 more
doaj   +1 more source

The winter 2023/2024 floods in the UK: a hydrological appraisal

Weather, EarlyView.
From October 2023 to March 2024, the UK saw a succession of named storms and low‐pressure weather systems, leading to widespread exceptional river flows throughout. Peak flow records were broken in several catchments, but this event was most notable for its duration and spatial footprint, which resulted in major impacts.
Eugene Magee, Rachael Armitage, Wilson Chan, Gayatri Suman, Amit Kumar, Lucy J. Barker, Stephen Turner, Jamie Hannaford, Catherine Sefton   +8 more
wiley   +1 more source

Analytical and Experimental Study of Key Performance of Helicopter Rotor Torsion–Tension Straps

Actuators
As a crucial component of rotor systems, tension and torsion (TT) straps, recognized for their compact structure, have been adopted in advanced helicopters such as the SB > 1, EC145, and Mi-26.
Yamin Wang, Ruchuan Zhou, Wenjun Huang
doaj   +1 more source

Monitoring GPS‐collared moose by ground versus drone approaches: efficiency and disturbance effects

Wildlife Biology, EarlyView.
Efficient wildlife management requires precise monitoring methods, for example to estimate population density, reproductive success, and survival. Here, we compared the efficiency of drone (equipped with a RGB camera) and ground approaches to detect and observe GPS‐collared female moose Alces alces and their calves. We also quantified how drone (n = 42)
Martin Mayer, Erlend Furuhovde, Kristoffer Nordli, Giorgia Myriam Ausilio, Petter Wabakken, Ane Eriksen, Alina L. Evans, Karen Marie Mathisen, Barbara Zimmermann   +8 more
wiley   +1 more source

Longitudinal Integrated Attitude Control Law Design and Robustness Analysis of Tiltrotor Aircraft

Nanjing Hangkong Hangtian Daxue Xuebao
Since the tiltrotor aircraft needs to switch configurations among helicopter mode， transition mode， and fixed-wing mode within its flight envelope， and its dynamic characteristics vary significantly under different configurations， it is necessary to ...
CHEN Guojun, LIU Yi, ZHANG Wei
doaj   +1 more source

A high‐altitude thermal infrared method for estimating moose abundance and demography in Rocky Mountain National Park, USA

Wildlife Biology, EarlyView.
Resource managers require accurate estimates of large herbivore abundance and demography to maintain ecological integrity. Common methods to count these species, including observations from low altitude helicopter flights, may conflict with other protected area management objectives and struggle to produce precise estimates for more cryptic species. To
Hanem G. Abouelezz, N. Thompson Hobbs
wiley   +1 more source

Research on dynamic verification method of helicopter minimum flight crew based on Monte Carlo model

Hangkong gongcheng jinzhan
Scientifically verifying the rationality of the minimum flight crew configuration is a key issue in helicopter human factors airworthiness certification. To meet the development demands of operational efficiency and cost control in the aviation industry,
SONG Yong, XU Yuan, ZOU Yanzhang
doaj   +1 more source