摘要
针对典型的均匀腐蚀与点蚀体系中的噪声数据,研究了采用多项式拟合法消除噪声数据中直流漂移的方法的特点,并对消除前后数据的时域分析和频域分析结果的差异进行了比较.结果表明:采用多项式拟合法可以很好地消除噪声数据中的直流漂移,但是必须注意多项式最高方次的选择,建议通过功率谱密度(PSD)图判断拟合结果的正确性.试验证明:为了避免对低频数据产生过度消除,多项式最高方次不宜过高.消除漂移后,噪声谱、噪声时域统计量和PSD的低频段均发生了明显的变化.
Polynomial fitting was applied to remove the DC trend or drift from the electrochemical noise （EN） data of the general corrosion and pitting corrosion. The characteristics of the method were studied and the differences between the results obtained from the EN data with and without drift removing were compared in the time and frequency domains. The results showed that the polynomial fitting is a good detrending method, but it is very important for users to select the polynomial order and verify the detrending results by the power spectral density （PSD）. In order to remove the trend and keep the useful low-frequency components the authors recommend that lower polynomial orders would be good. After drift removing, the EN spectrum, statistical parameters in time domain, and the lower frequency part of the PSD will be changed obviously.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第10期39-42,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
中国石油天然气集团公司石油管力学和环境行为重点实验室基金资助项目
中国石油天然气集团公司石油科技中青年创新基金开放课题
关键词
电化学噪声
多项式拟合
消除
直流漂移
electrochemical noise （EN）
polynomial fitting
removal
DC trend or drift
