| 油松单根抗拉试验数据的降噪分析 |
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| 引用本文： | 王萍花,陈丽华,王学顺,周朔,冀晓东,赵红华.油松单根抗拉试验数据的降噪分析[J].中国水土保持科学,2011,9(4):66-71. |
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| 作者姓名： | 王萍花 陈丽华 王学顺 周朔 冀晓东 赵红华 |
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| 作者单位： | 1. 北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,100083,北京
2. 北京林业大学理学院,100083,北京 |
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| 基金项目： | 国家自然科学基金“林木根系基本力学性能研究”(30872067); 中国教育部博士基金“林木根系拉伸特性的试验研究”(20090014110002); 青年科学基金“林木根系与土壤摩擦锚固性能研究”(30901162) |
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| 摘 要： | 林木单根抗拉试验数据经常受到试验环境背景、仪器随机误差、人为操作等各类噪声污染,对根系抗拉力学特性的分析结果影响很大。为了提高根系抗拉力学特性的分析精度,需要对试验数据进行预处理。尽管小波降噪理论日渐成熟,但其在林业根系固土机制研究方面的应用并未得到推广。应用小波变换对油松250标距的单根抗拉试验数据进行降噪研究,分别采用到的降噪研究方法有:3～31点平滑法、非线性小波硬阈值(Hard)法、固定阈值(Fixed)法、最大最小阈值(Mini-max)法及Rig.Sure阈值(sure)法。结果表明:各种窗口宽度的平滑法中,9点平滑法被证明降噪效果更为显著;而基于小波变换的Rig.Sure阈值法能够更为有效地降低试验数据中的噪声信号,保留有效信息,提高试验数据的质量及分析能力。
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| 关 键 词： | 单根抗拉 小波变换 降噪 多分辨分析 |
De-nosing root tensile test data of Pinus tabulaeformis |
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| Wang Pinghua,Chen Lihua,Wang Xueshun,Zhou Shuo,Ji Xiaodong,Zhao Honghua.De-nosing root tensile test data of Pinus tabulaeformis[J].Science of Soil and Water Conservation,2011,9(4):66-71. |
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| Authors: | Wang Pinghua Chen Lihua Wang Xueshun Zhou Shuo Ji Xiaodong Zhao Honghua |
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| Institution: | Wang Pinghua1,Chen Lihua1,Wang Xueshun2,Zhou Shuo1,Ji Xiaodong1,Zhao Honghua1 (1.College of Soil and Water Conservation,Beijing Forestry University,Key Lab.of Soil & Water Conservation and Desertification Combating,Ministry of Education,2.College of Science,Beijing Forestry University: 100083,Beijing,China) |
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| Abstract: | The database of single root tensile test is often confused by a series of noise because of test environment,testing machine random error,artificial operation,which greatly influences accurate analytical result.In order to improve analytical precision,the data is needed to be pretreated.The purpose of the study is to eliminate noise of root tensile test data of Pinus tabulaeformis with gauge length 250mm by wavelet analysis.Several multi-resolution wavelet de-nosing methods are applied,including from 3 to 31... |
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| Keywords: | pull-resistance of single root wavelet transform de-nosing multi-resolution analysis |
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