软件滤波在土体自振柱试验中的应用
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摘要
自振柱试验是测量土样动剪切模量和阻尼比的常用方法,但由于噪声等环境因素的影响,土样扭剪自由振动的衰减波曲线有时会因高频干扰出现不平滑现象,难以得到合理的测试结果。软件数字滤波是解决这类问题的有效方法。本文通过多种软件数字滤波方法优缺点的对比,认为平均滤波法和惯性滤波法能有效解决试验数据中的高频干扰问题,并分别选择适当的滤波参数,得到了平滑的自振衰减波曲线;最后,采用平均滤波法处理了两组自振柱试验数据。结果表明,软件滤波法确能有效消除不合理数据,得到符合一般规律的土体动剪切模量和阻尼比试验结果,从而验证了其在土体自振柱试验中的应用价值。
Free vibration column test is a common testing method for measuring dynamic shear modulus and damping ratio of soil specimen.Because of the influence of environmental factors,such as noises etc,the free vibration attenuation wave curve of soil specimen obtained from the test sometimes may be unsmooth,which leads to incorrect dynamic shear modulus and damping ratio.Software digital filter is an effective method to solve this problem.By comparing with the main advantages and disadvantages of many filters,the average method filter and the inertia method filter can be adopted to solve this problem more effectively for this problem.Suitable parameters of the two filters are chose to obtain smoothing curves of free-vibration attenuation wave.At last,three groups of experimental data are selected to discuss the effectiveness using the average method filter.The result shows that it can eliminate the abnormal results due to high-frequency interfering wave effectively,and thus the desirable results of dynamic shear modulus and damping ratio can be obtained.This result verified the application value of software filter in free vibration column test.
Free vibration column test is a common testing method for measuring dynamic shear modulus and damping ratio of soil specimen.Because of the influence of environmental factors,such as noises etc,the free vibration attenuation wave curve of soil specimen obtained from the test sometimes may be unsmooth,which leads to incorrect dynamic shear modulus and damping ratio.Software digital filter is an effective method to solve this problem.By comparing with the main advantages and disadvantages of many filters,the average method filter and the inertia method filter can be adopted to solve this problem more effectively for this problem.Suitable parameters of the two filters are chose to obtain smoothing curves of free-vibration attenuation wave.At last,three groups of experimental data are selected to discuss the effectiveness using the average method filter.The result shows that it can eliminate the abnormal results due to high-frequency interfering wave effectively,and thus the desirable results of dynamic shear modulus and damping ratio can be obtained.This result verified the application value of software filter in free vibration column test.
引文
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[6]甘志强,詹宏英.软件数字滤波的应用[J].电子测量技术,1997,(1):18-20.Gan Z Q,Zhan H Y.Application of software digitalFilter[J].Electronic Measurement Technology,1997,(1):18-20.
[2]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.Chen G X.Geotechnical Earthquake Engineering[M].Beijing:Science Press,2007.
[3]中达电通公司.浅析软件滤波在自动控制中的应用[J].电力电子,2007,(3):38-40.Delta-CIMIC Electronics Co.,Ltd.Application ofsoftware filters in Auto,control[J].Circuit&SystemControl,2007,(3):38-40.
[4]于春梅,杨胜波.工程中几种实用软件滤波器的原理及应用[J].南通工学院学报,2001,(3):18-20.Yu C M,Yang S B.The principle and the applicationof some practical software filters[J].Journal of Nan-tong Institute of Technology,2001,(3):18-20.
[5]罗小巧.数据采集系统中数字滤波方法[J].电子测量技术,2004,(4):35-36.Luo X Q.The study of software filter in data acquisi-tion system[J].Electronic Measurement Technology,2004,(4):35-36.
[6]甘志强,詹宏英.软件数字滤波的应用[J].电子测量技术,1997,(1):18-20.Gan Z Q,Zhan H Y.Application of software digitalFilter[J].Electronic Measurement Technology,1997,(1):18-20.
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