Results 21 to 30 of about 4,437,500 (186)

Wind turbine wake measurements with automatically adjusting scanning trajectories in a multi-Doppler lidar setup [PDF]

open access: yesAtmospheric Measurement Techniques, 2018
In the context of the Perdigão 2017 experiment, the German Aerospace Center (DLR) deployed three long-range scanning Doppler lidars with the dedicated purpose of investigating the wake of a single wind turbine at the experimental site.
N. Wildmann, N. Vasiljevic, T. Gerz
doaj   +1 more source

A new sensorless method for switched reluctance motor drives [PDF]

open access: yes, 1998
This paper describes a new method for indirect sensing of the rotor position in switched reluctance motors (SRMs) using pulse width modulation voltage control.
Gallegos-Lopez, G.   +2 more
core   +1 more source

Induction machine fault detection enhancement using a stator current high resolution spectrum [PDF]

open access: yes, 2012
Fault detection in squirrel cage induction machines based on stator current spectrum has been widely investigated. Several high resolution spectral estimation techniques have been developed and used to detect induction machine abnormal operating ...
CHARPENTIER, Jean-Frederic   +8 more
core   +1 more source

Rotor eddy current power loss in permanent magnet synchronous generators feeding uncontrolled rectifier loads

open access: yes, 2014
Analytical methods and transient finite element analysis (FEA) with rotating mesh are used to calculate rotor eddy current power loss in a permanent magnet synchronous generator (PMSG) connected to an uncontrolled bridge rectifier.
Sharkh, S.M.   +4 more
core   +1 more source

An Application to Transient Current Signal based Induction Motor Fault Diagnosis of Fourier-Bessel Expansion and Simplified Fuzzy ARTMAP [PDF]

open access: yes, 2013
The start-up transient signals have been widely used for fault diagnosis of induction motor because they can reveal early defects in the development process, which are not easily detected with the signals in the steady state operation. However, transient
Ball, Andrew   +4 more
core   +1 more source

Design of Meteorological Element Detection Platform for Atmospheric Boundary Layer Based on UAV

open access: yesInternational Journal of Aerospace Engineering, 2017
Among current detection methods of the atmospheric boundary layer, sounding balloon has disadvantages such as low recovery and low reuse rate, anemometer tower has disadvantages such as fixed location and high cost, and remote sensing detection has ...
Yonghong Zhang   +2 more
doaj   +1 more source

Low-Altitude Aerial Methane Concentration Mapping

open access: yesRemote Sensing, 2017
Detection of leaks of fugitive greenhouse gases (GHGs) from landfills and natural gas infrastructure is critical for not only their safe operation but also for protecting the environment.
Bara J. Emran   +2 more
doaj   +1 more source

A new method of accurate broken rotor bar diagnosis based on modulation signal bispectrum analysis of motor current signals

open access: yes, 2014
Motor current signature analysis (MCSA) has been an effective way of monitoring electrical machines for many years. However, inadequate accuracy in diagnosing incipient broken rotor bars (BRB) has motivated many studies into improving this method.
Gu, Fengshou   +10 more
core   +1 more source

Minor rotor tines and knives soil interaction. Total power calculation for minor rotor drive

open access: yesВестник СибАДИ
Introduction. The problem of fast and high-quality road construction, when economic facilities and settlements are spatially separated, located at a considerable distance from each other, cannot be solved without the use of a complex of continuous units.
V. A. Nikolaiev
doaj   +1 more source

MONITORING SEABIRDS AND MARINE MAMMALS BY GEOREFERENCED AERIAL PHOTOGRAPHY [PDF]

open access: yesThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016
The assessment of anthropogenic impacts on the marine environment is challenged by the accessibility, accuracy and validity of biogeographical information.
G. Kemper   +3 more
doaj   +1 more source

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