In this paper, the mathematical model of DFIG and variable pitch system is established.

本文分别分析了双馈发电机和变桨距系统的数学模型。

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Each component part of pitch has different show and effects to the whole system stability in the modified pitch system of SBS.

在SBS改性沥青体系中，沥青各个组分对整个体系稳定性有不同的表现和作用。

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The good or bad of variable pitch system affects wind generating set efficiency, safe operation and stable operation to a large extent.

变桨距系统的好坏很大程度地影响风力发电机组的效率、安全运行与稳定运行。

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Twyford Orchards has been a traveller site for more than 30 years and operates under a licence system, with one licence per pitch.

BBC: Twyford Orchards Gypsy site will be expanded

The Scottish Premier League said a combination of frozen pipes in three of the four stands at Rugby Park and concerns about the pitch due to a fault in the protection system caused by the severe weather prompted the call off.

BBC: Football in snow

Fine, but you'll more than likely pitch 'em in favor of your home audio system anyway.

ENGADGET: Sharp goes big and boastful with 52-, 46-, 42-inch Aquos LCDs