Results 81 to 90 of about 24,309 (310)

Propagation Mechanism Analysis of Wind Turbine Ripples Caused by Wind Shear

Kongzhi Yu Xinxi Jishu, 2019
Wind shear will change the state of wind turbine, and influence the quality of the power feeding back to the network. In this paper, a permanent-magnet direct-drive synchronous cylindrical wind turbine was used as an example in order to study the ...
LI Zhiyong, HUANG Guohang, WANG Xin, CHEN Yougen   +3 more
doaj  

Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites

Advanced Engineering Materials, EarlyView.
Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter, Andreas Bezold, Johan Westraadt, Katharina Fiegl, Subham Chattoraj, Benjamin Wahlmann, Carolin Körner, Michael Mills, Mathias Göken, Steffen Neumeier   +9 more
wiley   +1 more source

Determining Wind Shear Threshold by Using Historical Sounding Data in Experimental Area

Atmosphere
This paper conducts a technical study on a method for determining the occurrence threshold of wind shear based on historical sounding data. After analyzing the impact of low-altitude wind shear on aircraft flight safety, a method for determining the ...
Tingting Shu, Qinglin Zhu, Xiang Dong, Houcai Chen, Leke Lin, Xuan Liu   +5 more
doaj   +1 more source

Competing Effects of Droplet Sedimentation and Wind Shear on Entrainment in Stratocumulus

Journal of Advances in Modeling Earth Systems, 2019
The joint effect of droplet sedimentation and wind shear on cloud top entrainment in stratocumulus is investigated with direct numerical simulations. Although it is well understood that droplet sedimentation weakens entrainment while wind shear enhances ...
Bernhard Schulz, Juan Pedro Mellado
doaj   +1 more source

Uncertainty in vertical extrapolation of measured wind speed via shear

, 2019
This report provides formulations for estimation of uncertainties involved in vertical extrapolation of winds, as well as the total uncertainty incurred when winds observed at one height are extrapolated to turbine hub height for wind resource assessment.
Hernández Fillols, Francisco, Kelly, Mark, Kersting, Gibson, Clark, Steve, Mazoyer, Paul, Matos, José Carlos, Yang, Changfeng   +6 more
core   +1 more source

Recycling of NiTi Shape Memory Alloys: Fundamental and Technological Aspects of a Vacuum Induction Melting Processing Route

Advanced Engineering Materials, EarlyView.
The present study investigates recycling of NiTi shape memory alloys via vacuum induction melting. An ingot was synthesized from elemental Ni and Ti and subjected to three subsequent remelting cycles. Remelting increases process durations and impurity levels and adversely affects microstructures and functional properties.
Sakia Sophia Noorzayee, Son Tung Mai, Sarath Menon, Braulio Gadiel Sánchez Ortega, Ralf Drautz, Alexander Kauffmann, Gunther Eggeler, Jan Frenzel   +7 more
wiley   +1 more source

Wind shear climatology for large wind turbine generators [PDF]

, 1982
Climatological wind shear analyses relevant to the design and operation of multimegawatt wind turbines are provided. Insight is provided for relating the wind experienced by a rotating blade in a shear flow to the analysis results. A simple analysis of the wind experienced by a rotating blade for three types of wind shear profiles under steady-state ...
Elliott, D. L., Wendell, L. L., Heflick, S. K.   +2 more
openaire   +2 more sources

Offshore vertical wind shear: Final report on NORSEWInD’s work task 3.1 [PDF]

, 2012
This document reports on the analysis performed by the work task 3.1 of the EU NORSEWInD project and includes the following deliverables: 3.2 Calculated vertical wind shears 3.3 Multi-variational correlation analysis 3.4 NWP data for wind shear model 3.5
Hasager, Charlotte Bay, Courtney, Michael, Hahmann, Andrea N., Gryning, Sven-Erik, Mikkelsen, Torben, Karagali, Ioanna, Pena Diaz, Alfredo, Badger, Merete   +7 more
core  

Structure of unsteady stably stratified turbulence with mean shear.

, 2004
The statistics of unsteady turbulence with uniform stratification N (Brunt–Väisälä frequency) and shear α(=dU1/dx3) are analysed over the entire time range (00 and \it Ri>0.25 respectively, oscillatory momentum and positive and negative density fluxes ...
Hanazaki, H, J. C. R. Hunt, Hanazaki, H., H. Hanazaki, Hunt, J.C.R., Hunt, JCR, Hanazaki, H. (author), Hunt, J.C.R. (author)   +7 more
core   +1 more source

Optimization of the Production of Rubber Compounds Using Mathematical Models

Advanced Engineering Materials, EarlyView.
Rubber compounds were mixed in a batch internal mixer, and symbolic regression was used to derive mathematical models linking recipe and process parameters to ram path, torque, and mixing quality (incorporation, dispersion, distribution). Subsequent optimization with evolutionary algorithms identified operating conditions that reduce specific energy ...
Anke Bardehle, Andreas Limper, Ulrich Giese, Carlos Lucke, Mario Beiner, Christoph Gögelein, Lisa Leuchtenberger‐Engel, Christian Hopmann   +7 more
wiley   +1 more source