Results 31 to 40 of about 6,045 (208)
A quasi-analytical prediction method for gear load-independent power losses for shroud approaching
Engineering Science and Technology, an International Journal, 2023 To limit the adverse effect of the fluid pressure field in high-speed gearing systems, especially for the main reducer of helicopters, shrouds usually adopted to enclose and approaches the high-speed gears will play a vital role in the windage and ...
X. Zhu, J.N. Bian, Y. Dai
doaj +1 more source
ISO efficiency curves of a two-phase hybrid stepping motor [PDF]
, 2010 Stepping motors are used in numerous applications because of their low manufacturing cost and simple speed control. It is well known that their energetic efficiency is low but actual values are typically not available.
Cottyn, Johannes +8 more
core +1 more source
A novel drifter designed for use with a mounted Acoustic Doppler Current Profiler in shallow environments [PDF]
, 2013 We present a novel design for a surface drifter, mounted with a pulse-coherent Acoustic Doppler Current Profiler (ADCP) for measuring near-surface (depths 0.18-1 m) flows.
Henderson, Stephen M. +1 more
core +2 more sources
Hydraulic Analysis of a Reversible Fluid Coupling [PDF]
, 2000 This paper presents a hydraulic analysis of a fluid coupling which is designed to operate either in a forward or reverse mode when a set of turning vanes are respectively withdrawn or inserted into the flow between the driving and driven rotors.
Brennen, Christopher E. +2 more
core +1 more source
Dynamic Windage Yaw Angle and Dynamic Wind Load Factor of a Suspension Insulator String
Shock and Vibration, 2022 A simplified calculation method is proposed for determining the peak dynamic windage yaw angle φ^ of electricity transmission line (TL) tower suspension insulator strings (SISs).
Shuang Zhao +6 more
doaj +1 more source
Applied Sciences, 2022 To investigate the effects of surface roughness on windage loss and flow characteristics in a shaft-type gap, the skin friction coefficient (Cf) and flow versus Reynolds number (Re) at different surface roughness (Ra) and radius ratio (η) values were ...
Lehao Hu +4 more
doaj +1 more source
Electric hybrid airship with unlimited flight time [PDF]
E3S Web of Conferences, 2020 This paper examines the possibility of using photoelectric energy conversion during creation of electric unmanned aerial vehicles of a hybrid type. These vehicles should operate at altitudes up to 22,000 m and have an unregulated flight time.
Pisarevskiy Yu. V. +5 more
doaj +1 more source
Vestnik MGSU, 2017 The article deals with the composition of the landscape and building on the basis of the laws of aerodynamic resistance of objects to the wind flow and the resulting physical effect of sail. The application of landscape-visual assessment based on windage properties as a criterion for the development of the architectural and town-planning appearance of ...
openaire +2 more sources
Biological Reviews, EarlyView.ABSTRACT The ecology of forests, their losses, and terrestrial wood decomposition dynamics have been intensively studied and reviewed. In the aquatic realm, reviews have concentrated on large wood (LW) in rivers and the transition from freshwater to marine environments in the Pacific Northwest of North America. However, a comprehensive global synthesis
Jon Dickson +9 more
wiley +1 more source
Wind tunnel and numerical study of a small vertical axis wind turbine [PDF]
, 2009 This paper presents a combined experimental and computational study into the aerodynamics and performance of a small scale vertical axis wind turbine (VAWT).
Berg +8 more
core +1 more source