scholarly journals Improvement Dependability of Offshore Horizontal-Axis Wind Turbines by Applying New Mathematical Methods for Calculation the Excess Speed in Case of Wind Gusts

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3085
Author(s):  
Konstantin Osintsev ◽  
Seregei Aliukov ◽  
Alexander Shishkov
Keyword(s):  
Computer Simulation ◽  
Wind Turbines ◽  
Experimental Studies ◽  
Offshore Wind ◽  
Approximation Schemes ◽  
Calculation Error ◽  
Strong Wind ◽  
Mathematical Methods ◽  
Wind Gusts ◽  
Gas Dynamic

The problem of increasing the reliability of wind turbines exists in the development of new offshore oil and natural gas fields. Reducing emergency situations is necessary due to the autonomous operation of drilling rigs and bulk seaports in the subarctic and Arctic climate. The relevance of the topic is linked with the development of a methodology for theoretical and practical studies of gas dynamics when gas flows in a pipe, based on a mathematical model using new mathematical methods for calculation of excess speeds in case of wind gusts. Problems in the operation of offshore wind turbines arise with storm gusts of wind, which is comparable to the wave movement of the gas flow. Thus, the scientific problem of increasing the reliability of wind turbines in conditions of strong wind gusts is solved. The authors indicate a gross error in the calculations when approximating through the use of the Fourier series. The obtained results will allow us to solve one of the essential problems of modeling at this stage of its development, namely: to reduce the calculation time and the adequacy of the model built for similar installations and devices. Experimental studies of gas-dynamic flows are carried out on the example of a physical model of a wind turbine. In addition, a computer simulation of the gas-dynamic flow process was carried out. The use of new approximation schemes in processing the results of experiments and computer simulation can reduce the calculation error by 1.2 percent.

Horizontal approximation schemes for the staggered reduced latitude-longitude grid

2021 ◽  
Vol 434 ◽  
pp. 110234
Author(s):  
Gordey S. Goyman ◽  
Vladimir V. Shashkin
Keyword(s):  
Approximation Schemes

scholarly journals Approximation Schemes for Independent Set and Sparse Subsets of Polygons

2019 ◽  
Vol 66 (4) ◽  
pp. 1-40
Author(s):  
Anna Adamaszek ◽  
Sariel Har-Peled ◽  
Andreas Wiese
Keyword(s):  
Independent Set ◽  
Approximation Schemes

scholarly journals Linear-time approximation schemes for clustering problems in any dimensions

2010 ◽  
Vol 57 (2) ◽  
pp. 1-32 ◽  
Author(s):  
Amit Kumar ◽  
Yogish Sabharwal ◽  
Sandeep Sen
Keyword(s):  
Linear Time ◽  
Approximation Schemes ◽  
Time Approximation ◽  
Clustering Problems

scholarly journals Approximation schemes for the study of multi-band Gutzwiller wave functions

2016 ◽  
Vol 254 (1) ◽  
pp. 1600166 ◽  
Author(s):  
Jörg Bünemann ◽  
Thorben Linneweber ◽  
Florian Gebhard
Keyword(s):  
Wave Functions ◽  
Approximation Schemes ◽  
Multi Band

Parallel approximation schemes for Subset Sum and Knapsack problems

1987 ◽  
Vol 24 (4) ◽  
pp. 417-432 ◽  
Author(s):  
Joseph G. Peters ◽  
Larry Rudolph
Keyword(s):  
Knapsack Problems ◽  
Approximation Schemes ◽  
Subset Sum ◽  
Parallel Approximation
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