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基于短期振动测量数据的线路振动状态评估方法 被引量:13
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作者 王洪 柳亦兵 +2 位作者 董玉明 徐鸿 刘胜春 《电网技术》 EI CSCD 北大核心 2008年第12期12-16,共5页
为准确掌握线路的振动状态、保证线路运行安全,需要对新建关键线路或老旧线路的振动状态和疲劳寿命进行评估。评估的主要手段是短期内现场测量导线的振动大小,并将其作为评估线路振动寿命的依据。由于线路全年气象条件差异较大,如果不... 为准确掌握线路的振动状态、保证线路运行安全,需要对新建关键线路或老旧线路的振动状态和疲劳寿命进行评估。评估的主要手段是短期内现场测量导线的振动大小,并将其作为评估线路振动寿命的依据。由于线路全年气象条件差异较大,如果不加推导和分析,直接采用短期振动数据进行评估将有较大误差。文章提出了一种基于短期测量数据评估线路全年振动状态和寿命的方法,从气象影响线路振动的主要因素出发,根据导线的状态方程分析导线因张力变化对导线自阻尼特性的影响,并采用功率平衡法计算出振动水平的变化,得到了不同气象条件下的振动寿命。采用该评估方法对某工程实例进行分析,结果表明该方法能有效解决用短期测量数据评估线路全年寿命的问题。 展开更多
关键词 架空线路 短期测量数据 微风振动 多气象条件 寿命评估
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Re-measuring International Short-term Capital Flow into China with Varying Methods
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作者 张明 《China Economist》 2011年第5期80-92,共13页
This paper.fi'rst conducts a systematic review of domestic and foreign scholars' approaches to predicting short-term capital flows, then employs a combination of both direct and indirect methods to carry out its ana... This paper.fi'rst conducts a systematic review of domestic and foreign scholars' approaches to predicting short-term capital flows, then employs a combination of both direct and indirect methods to carry out its analysis. Three kinds of indicators, both specific and general, are applied in both methods. Thorough consideration is given to short-term international capital inflow from trade, other current account items, capital account, and errors and omissions, as well as other channels through which short term capital might accrue to a nation's balance. Based on a comprehensive comparison of year-on-year data, this paper also estimates monthly data using a simplified, indirect calculation approach. Estimates show that, despite a degree of difference in results between methods, most estimates are highly consistent for a given period. Based on monthly estimates, we conclude that turbulence in international financial markets (i.e., the United States subprime mortgage crisis and the European sovereign debt crisis) has had a major impact on China 's short-term capital flow. 展开更多
关键词 short-term international capital flows direct method indirect method scale measurement
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