《机电工程》杂志,浙江大学与浙江省机电集团联合主办。月刊( 详细... )

中国标准连续出版物号 ISSN 1001-4551 CN 33-1088/TH
主办单位浙江省机电集团有限公司
浙江大学
主编赵 群
副 主 编唐任仲、罗向阳
执行董事兼总经理罗向阳
出 版浙江《机电工程》杂志社有限公司
地 址浙江省杭州市大学路高官弄9号
电话Tel+86-571-87239525
E-mailmeem_contribute@163.com
国外发行中国国际图书贸易总公司
订阅全国各地邮局   国外代号M3135
国内发行浙江省报刊发行局
邮发代号32-68
广告发布登记证:杭上市管广发G-001号

在线杂志

当前位置: 机电工程 >>在线杂志

基于Laguerre滤波的超声波流量计降噪方法研究*

作者:刘丽B,鲍敏,沈卫平 日期:2009-11-16/span> 浏览:2298 查看PDF文档

基于Laguerre滤波的超声波流量计降噪方法研究*

刘丽B,鲍敏,沈卫平
(浙江理工大学 机械与自动控制学院,浙江 杭州 310018)

摘要:针对气体超声波流量计利用过零检测定位波形脉冲时的干扰因素,以及计算系统对数据处理实时性的要求,对基于Laguerre滤波的递归最小二乘(RLS)降噪算法进行了研究,实现了在处理速度与稳定性上的折中。为信号后处理提供了理想的波形,避免了波形失真导致脉冲漏检、零位判断错误等误差因素的产生,给出了实时性强、波形定位准确、系统稳定性和抗干扰性能良好的气体超声流量计信号处理算法。研究结果表明,基于此算法的气体超声波流量计经检验具备2级精度。
关键词:气体超声波流量计;过零检测;Laguerre滤波;递归最小二乘
中图分类号:TB126文献标识码:A文章编号:1001-4551(2009)09-0054-03

Denoising study for ultrasonic gas flow measurements based on Laguerre filter
LIU Lijun, BAO Min, SHEN Weiping
(Faculty of Mechanical Engineering & Automation, Zhejiang SciTech University, Hangzhou 310018, China)
Abstract: Aiming at the interfering factors that exist at zerocross point and the real time of data processing in gas ultrasonic flowmeter, a Laguerre filter based recursive least squares (RLS) adaptive technique was studied to achieve a compromise between processing speed and stability of the system. The ideal waveform for the follow processing was provided, the waveform distortion resulting in missed pulses, wrong tracking of zerocross point and other error factors were avoided. The signal processing algorithm was applied to get good antiinterference performance, reconstruct a normalized and high signal to noise ratio(SNR) echo wave, and improve stability of system. The research results show that precision of this gas ultrasonic flowmeter achieves 2%.
Key words: gas ultrasonic flowmeter; digital processing; Laguerre filter; recursive least squares(RLS)
参考文献(References):
[1]American Gas Association. Measurement of Gas by Multipath Ultrasonic Meters[M]. 2nd ed. American Gas Association,2007.
[2]BRASSIER P, HOSTEN B, VULOVIC F. Highfrequency transducers and correlation method to enhance ultrasonic gas flow metering[J]. Flow Measurement and Instrumentation,2001,12(3):201-211.
[3]CASTAGNEDE B, ROUX J, HOSTEN B. Correlation method for normal mode tracking in anisotropic media using an ultrasonic immersion system[J]. Ultrasonics,1989,27(5):280-287.
[4]ROOSNEK N. Novel digital signal processing techniques for ultrasonic gas flow measurements[J]. Flow Measurement and Instrumentation,2000,11(2):89-99.
[5]张D,兰从庆.匹配小波滤波在超声信号处理中的应用[J].无损检测,2002,24(12):507-511.
[6]MERCHED R, SAYED A H. Extended fast fixed order RLS adaptive filters[C]//The 2001 IEEE International Symposium on Circuits and System,2001:665-668.
[7]MASNADISHIRAZI M A, GHASEMI M. Adaptive Laguerre network realization[J]. Signal Processing,2000,80(10):2169-2186.
[8]陈尚勤,李晓峰.快速自适应信息处理[M].北京:人民邮电出版社,1993.

友情链接

浙江机械信息网