Approximation Schemes for Packing with Item Fragmentation

Approximation and Online Algorithms - Lecture Notes in Computer Science ◽

10.1007/11671411_26 ◽

2006 ◽

pp. 334-347 ◽

Cited By ~ 7

Author(s):

Hadas Shachnai ◽

Tami Tamir ◽

Omer Yehezkely

Keyword(s):

Approximation Schemes ◽

Item Fragmentation

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Approximation Schemes for Packing with Item Fragmentation

Theory of Computing Systems ◽

10.1007/s00224-007-9082-x ◽

2007 ◽

Vol 43 (1) ◽

pp. 81-98 ◽

Cited By ~ 19

Author(s):

Hadas Shachnai ◽

Tami Tamir ◽

Omer Yehezkely

Keyword(s):

Approximation Schemes ◽

Item Fragmentation

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Approximation Schemes for an Aeroelastic-Control System

10.23919/acc.1988.4790101 ◽

1988 ◽

Author(s):

J. Turi ◽

S.M. Rankin

Keyword(s):

Control System ◽

Approximation Schemes

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

Energies ◽

10.3390/en14113085 ◽

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.

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