经验模态分解和空间滤波在两相流速度测量中的应用
|
摘要
在利用空间滤波和电容传感器测量两相流速度时,需要准确测量电容传感器输出信号的带宽。针对此问题提出一种利用经验模态分解算法来测量传感器带宽的方法。文章首先介绍电容传感器的空间滤波效应和经验模态分解的基本原理,并给出固体速度和电容传感器输出信号带宽之间的关系。然后将经验模态分解和平滑滤波器结合对测量信号进行平滑处理,测量处理后的信号带宽,利用带宽计算得到两相流的速度,最后进行了仿真实验,由此方法得到的测量误差都在2%以内,这比利用小波变换方法得到的相对误差要小得多。仿真实验结果表明该方法能够对两相流速度进行比较准确地测量,这也证明了该方法的可行性与有效性。
The band-width of the output signal from capacitance sensor needs accurate measurement when measure the velocity of two-phase flow by spatial filter and capacitance sensor.So a method for measuring the band-width of the output signal from capacitance sensor using empirical mode decomposition is proposed in this paper.Firstly,spatial filtering effect of capacitance sensor and the basic principle of empirical mode decomposition are studied;the relationship between solid velocity and band-width of the output signal from capacitance sensor is given.Secondly,the signal is processed by empirical mode decomposition and smoothing filter,then the band-width of signal is found.With the help of the band-width,the velocity of two-phase flow can be computed.Finally,the simulation experiment results are given.The measurement relatively errors obtained by the method in this paper are all less than 2%.These measurement errors are significantly smaller than the ones obtained by wavelet transform.The simulation experiment results have shown that velocity of two-phase flow can be well obtained by the method in this paper,this has also verified the effectiveness and feasibility of this method.
The band-width of the output signal from capacitance sensor needs accurate measurement when measure the velocity of two-phase flow by spatial filter and capacitance sensor.So a method for measuring the band-width of the output signal from capacitance sensor using empirical mode decomposition is proposed in this paper.Firstly,spatial filtering effect of capacitance sensor and the basic principle of empirical mode decomposition are studied;the relationship between solid velocity and band-width of the output signal from capacitance sensor is given.Secondly,the signal is processed by empirical mode decomposition and smoothing filter,then the band-width of signal is found.With the help of the band-width,the velocity of two-phase flow can be computed.Finally,the simulation experiment results are given.The measurement relatively errors obtained by the method in this paper are all less than 2%.These measurement errors are significantly smaller than the ones obtained by wavelet transform.The simulation experiment results have shown that velocity of two-phase flow can be well obtained by the method in this paper,this has also verified the effectiveness and feasibility of this method.
引文
[1]吴新杰,陈跃宁,石玉珠,蒋秋莉.空间滤波和独立成分分析在速度测量中的应用[J].仪器仪表学报,2004,25(04):68-69.
[2]陆增喜,王师.气固两相流速度测量算法研究[J].工业计量,2007,17(03):7-9.
[3]孙定源,石玉珠,周桂贤,吴新杰.基于空间滤波效应的光透法测量粒子速度[J].辽宁大学学报(自然科学版),2004,31(01):1-3.
[4]马义德,史飞,李廉,安黎哲.一种基于脉冲耦合神经网络的脉冲噪声滤波器设计[J].生物医学工程学杂志,2004,21(06):1019-1023.
[5]熊飞,舒金龙,朱振福,李军伟.基于形态滤波与遗传算法的目标检测技术[J].系统工程与电子技术,2005,27(09):1561-1563.
[6]钱勇,黄成军,陈陈,江秀臣.基于经验模态分解的局部放电去噪方法[J].电力系统自动化,2005,29(12):53-60.
[7]胡灿阳,陈清军.非平稳地震地面运动分析方法及模型综述[J].结构工程师,2008,24(02):108-115.
[8]鞠萍华,秦树人,秦毅,丁志宇.多分辨EMD方法与频域平均在齿轮早期故障诊断中的研究[J].振动与冲击,2009,28(05):97-101.
[9]赵雯雯,曾兴雯.一种新的EMD去噪方法[J].电子科技,2008,21(05):30-36.
[10]吴新杰,张建成.形态滤波和空间滤波在两相流速度测量中的应用[J].传感技术学报,2007,20(09):2124-2127.
[11]刘少刚,孟庆鑫,罗跃生,董晓璋,田勇臣.任意结构形状的电容传感器原理和数学模型[J].北京林业大学学报,2008,30(04):17-21.
[12]Norden E.Huang,Zheng Shen,Stenen R.Long.A new viewof nonlinear water waves:The Hilbert Spectrum[J].An-nual Review of Fluid Mechanics,1999,31:417-457.
[2]陆增喜,王师.气固两相流速度测量算法研究[J].工业计量,2007,17(03):7-9.
[3]孙定源,石玉珠,周桂贤,吴新杰.基于空间滤波效应的光透法测量粒子速度[J].辽宁大学学报(自然科学版),2004,31(01):1-3.
[4]马义德,史飞,李廉,安黎哲.一种基于脉冲耦合神经网络的脉冲噪声滤波器设计[J].生物医学工程学杂志,2004,21(06):1019-1023.
[5]熊飞,舒金龙,朱振福,李军伟.基于形态滤波与遗传算法的目标检测技术[J].系统工程与电子技术,2005,27(09):1561-1563.
[6]钱勇,黄成军,陈陈,江秀臣.基于经验模态分解的局部放电去噪方法[J].电力系统自动化,2005,29(12):53-60.
[7]胡灿阳,陈清军.非平稳地震地面运动分析方法及模型综述[J].结构工程师,2008,24(02):108-115.
[8]鞠萍华,秦树人,秦毅,丁志宇.多分辨EMD方法与频域平均在齿轮早期故障诊断中的研究[J].振动与冲击,2009,28(05):97-101.
[9]赵雯雯,曾兴雯.一种新的EMD去噪方法[J].电子科技,2008,21(05):30-36.
[10]吴新杰,张建成.形态滤波和空间滤波在两相流速度测量中的应用[J].传感技术学报,2007,20(09):2124-2127.
[11]刘少刚,孟庆鑫,罗跃生,董晓璋,田勇臣.任意结构形状的电容传感器原理和数学模型[J].北京林业大学学报,2008,30(04):17-21.
[12]Norden E.Huang,Zheng Shen,Stenen R.Long.A new viewof nonlinear water waves:The Hilbert Spectrum[J].An-nual Review of Fluid Mechanics,1999,31:417-457.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心