The Estimation and Application of Extremes

机译：极值的估计和应用

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Wind speeds and ice thicknesses for a 50-year return period are presented in ASCE Manual 74 for the structural design of transmission lines. In this paper we discuss the occurrence of extremes for 50-year and longer return periods and methods for the estimation of extreme values from a limited number of years of wind or ice data. Plotting positions for the sample of extremes, graphical fits, extreme value distributions, and the methods of moments and probability weighted moments for analytical fits to the data to determine wind speeds and ice thicknesses for 50-year return periods are discussed. Extreme ice thicknesses for the St. Lawrence Valley are compared to design ice loads specified in the early 1970s for the 735kV system. The effect of wind on the accreted ice thickness is also discussed.

机译：对于输电线路的结构设计，ASCE手册74中介绍了50年恢复期的风速和冰厚。在本文中，我们讨论了50年和更长的回报期的极端事件的发生，以及从有限年的风或冰数据估算极端值的方法。讨论了极值，图形拟合，极值分布的样本的绘制位置，以及对数据进行拟合的矩量和概率加权矩量的方法，以确定50年回归期的风速和冰层厚度。将圣劳伦斯河谷的极端冰厚度与1970年代初为735kV系统指定的设计冰负荷进行了比较。还讨论了风对积冰厚度的影响。

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来源
《Conference on Electrical Transmission in a New Age Sep 9-12, 2002 Omaha, Nebraska》|2002年|p.32-47|共16页
会议地点 Omaha NE(US)
作者
K.F. Jones; H.B. White;
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作者单位

Snow and Ice Branch, Cold Regions Research and Engineering Laboratory, 72 Lyme Rd, Hanover, NH 03755;

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原文格式 PDF
正文语种 eng
中图分类电工技术;
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The Estimation and Application of Extremes

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