| Damage Detection Methods for Offshore Platforms Based on Wavelet Packet Transform |
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| 作者姓名： | 李东升 张兆德 王德禹 |
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| 作者单位： | [1]School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200030, China [2]College of Engineering, Ocean University of China, Qingdao 266071, China |
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| 基金项目： | This work is financially supported by the National Natural Science Foundation of China （Grant No. 50379025） and the Teaching and Research Award Program （2002） for 0utstanding Young Teachers in Higher Education Institutions of the Ministry of Education, P. R. China |
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| 摘 要： | 1 .IntroductionInthe whole service period of the platforms ,some damage is unavoidable due to the corrosion,impact ,fatigue and so on.The damage whould cause the structures’ultimate capacity and safety de-crease .Presently,it is generally acceptedthat the detection of damage involes considerable statisticaluncertainties,thus lot of efforts is made for the damage probalility model ,for example Song and Lu(1996) usedthefuzzy-settheoryto estimatethe humanerrorsthroughthe definitionof inspection…
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| 关 键 词： | 近海平台 灾害侦测 结构动力学 小波变换 |
| 收稿时间： | 2005-05-10 |
| 修稿时间： | 2005-09-20 |
Damage Detection Methods for Offshore Platforms Based on Wavelet Packet Transform |
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| LI Dong-sheng , ZHANG Zhao-de , WANG De-yu.Damage Detection Methods for Offshore Platforms Based on Wavelet Packet Transform[J].China Ocean Engineering,2005,19(4):701-710. |
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| Authors: | LI Dong-sheng ZHANG Zhao-de WANG De-yu |
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| Abstract: | The wavelet packet transform is used for the damage detection of offshore platforms. When some damage occurs, the dynamic response parameters of the structure will shift subtly. However, in some cases, the dynamic parameters, such as dynamic response, are not sensitive, and it is very difficult to predict the existence of damage. The present paper aims to describe how to find small damage by the use of wavelet packet transform. As the wavelet packet transform can be used to quickly find the singularity of the response signal on different scales, the acceleration signal of a damaged offshore platform in the time domain is transformed through the wavelet packet. Experimental results show that the Daubechies 4 wavelet transform can be used to detect damage. |
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| Keywords: | offshore platform damage detection wavelet packet transform |
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