基于改进EMD的船舶液舱液位测量方法及数据分析  

Data analysis of ship hold liquid level measurement based on improved empirical mode decomposition

作　　者：秦品乐[1,2] 林焰[1,2] 陈明[2] 

机构地区：[1]大连理工大学电子与信息工程学院,辽宁大连116024 [2]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《大连理工大学学报》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)

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.

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 

分 类 号：TN911.6[电子电信—通信与信息系统]