[1]丁海平,袁莉莉,刘成浩.窗函数和带宽对地震动相干函数的影响[J].自然灾害学报,2018,(03):001-11.[doi:10.13577/j.jnd.2018.0301]
 DING Haiping,YUAN Lili,LIU Chenghao.Effection of window function and bandwidth on the ground motion’s coherency function[J].,2018,(03):001-11.[doi:10.13577/j.jnd.2018.0301]
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窗函数和带宽对地震动相干函数的影响
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
期数:
2018年03期
页码:
001-11
栏目:
出版日期:
2018-06-28

文章信息/Info

Title:
Effection of window function and bandwidth on the ground motion’s coherency function
作者:
丁海平12 袁莉莉1 刘成浩1
1. 苏州科技大学 江苏省结构工程重点实验室, 江苏 苏州 215011;
2. 中国地震局工程力学研究所, 黑龙江 哈尔滨 150080
Author(s):
DING Haiping12 YUAN Lili1 LIU Chenghao1
1. Key Laboratory of Structure Engineering of Jiangsu Province, Suzhou 215011,China;
2. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
关键词:
SMART-1台阵相干函数窗函数带宽拟合
Keywords:
SMART-1 arraylagged coherencywindow functionbandwidthfitting
分类号:
P315.9;X9
DOI:
10.13577/j.jnd.2018.0301
摘要:
地震动空间相干函数计算过程中,需要采用窗函数对功率谱和互功率谱进行平滑。本文根据台湾SMART-1台阵采集的第五次地震记录的加速度时程,选取了布莱克曼(Blackman)窗、哈明(Hamming)窗和汉宁(Hanning)窗,以及0.68 Hz、1.07 Hz和1.46 Hz三种不同的带宽,计算了台站间距d为200 m、1 000 m、2 000 m三种距离的相干系数,并选择了Loh模型和Abrahamson模型对相干系数计算结果进行了拟合,通过对拟合曲线的对比发现:三种窗函数对相干系数计算结果的影响不大,但带宽的影响较大,带宽越大,相干系数越小。因此,在计算相干系数时,需要选择合适的带宽。
Abstract:
In the calculation of the coherency function of the ground motion, the window function is required to smooth the power spectrum and the auto-power spectrum.Based on the 5th large earthquake records of acceleration collected in SMART-1 array in Taiwan, this article selects Blackman window, Hamming window and Hanning window of 0.68 Hz, 1.07 Hz, and 1.46 Hz three different bandwidth, calculating the lagged coherency of distance d of the station between 200 m, 1 000 m and 2 000 m. According to Loh model and Abrahamson model,lagged coherency curves are fitted. By comparing the fitting curves, it is founded that: the window function has little influence on the lagged coherency, while the bandwidth has great influence on the lagged coherency.Therefore, when calculating the lagged coherency, the appropriate bandwidth is required.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-01-18;改回日期:2018-02-05。
基金项目:国家自然科学基金项目(51678383)
作者简介:丁海平(1966-),男,教授,主要从事地震工程和防灾减灾工程.E-mail:hpding@126.com
通讯作者:袁莉莉(1992-),女,硕士研究生,主要从事地震工程研究.E-mail:m18816282389@163.com
更新日期/Last Update: 1900-01-01