摘要
分析了自由浮态下提高液位测量精度的方法,然后针对采集到的非平稳液位信号,提出了一种改进的局部经验模态分解(empirical mode decomposition,EMD)方法进行滤波处理,去除信号中各瞬时频率成分,提取信号的平均趋势,并计算液位有效高度.仿真结果表明,采用改进后的局部EMD方法能有效地提高分解精度,实验数据的分析表明提出的液位测量方法是可行的,具有工程应用价值.
A method in improving accuracy for liquid level measurement in ship free-floatation is analyzed. Then an analysis method for the non-stationary liquid level signals, derived from the improved local empirical mode decomposition （EMD）, is proposed. While the transient frequency compositions are eliminated, the average trend of the signals is extracted by which the liquid level can be accounted. The simulation is shown that the improved local EMD is better than the basic＇s local EMD. By analyzing the measure data, the conclusion is drawn that the proposed liquid level measurement is viable and has applicable value in engineering.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2009年第3期391-395,共5页
Journal of Dalian University of Technology
基金
辽宁省"百千万人才工程"培养经费资助项目(2007186-25)
关键词
船舶
液位测量
非平稳信号
经验模态分解
B样条插值
ship
liquid level measurement
non-stationary signal
empirical mode decomposition（EMD）
B-spline interpolation
