基于分形维的锚杆有效振动信号特征的提取方法
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摘要
振动信号特征的有效提取是动态信号分析与处理过程中的关键技术。根据振动过程中的能量特性,对锚杆的振动特性和能量之间的关系,用ANSYS/LS-DYNA软件对锚杆在脉冲激励下的动态信号进行模拟,分别得到了未张拉和张拉状态下的振动幅度波形,通过MATLAB程序重现波形,然后采用分形维的方法对振动波形进行处理,获得了振动波形的初至以及整周期位置,从而证明了基于分形维的有效振动信号特征提取的可靠性。
The effective extract to vibration signal characteristics is the key technology in the process of dynamic analysis and processing.For the relationships between vibration characteristics and energy,and on the basis of energy characteristics in the procedure of vibration,the ANSYS / LS-DYNA software is used to simulate the dynamic signal under the impulse excitation for anchor bolt.Then the status of free and tension displacement wave is got respectively.The fractal dimension method is used to handle the wave,and the first arrival and integer cycle position is then obtained in MATLAB software.The result obtained from this study is demonstrated the reliability with the method of fractal to extract the valid signal characteristics.
The effective extract to vibration signal characteristics is the key technology in the process of dynamic analysis and processing.For the relationships between vibration characteristics and energy,and on the basis of energy characteristics in the procedure of vibration,the ANSYS / LS-DYNA software is used to simulate the dynamic signal under the impulse excitation for anchor bolt.Then the status of free and tension displacement wave is got respectively.The fractal dimension method is used to handle the wave,and the first arrival and integer cycle position is then obtained in MATLAB software.The result obtained from this study is demonstrated the reliability with the method of fractal to extract the valid signal characteristics.
引文
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[15]曹茂森,任青文,万林海等.Length分形维算法拾取地震波初至[J].石油地球物理勘探,2004,39(5):509-514.
[2]汪明武,王鹤龄.锚固质量的无损检测技术[J].岩土力学与工程学报,2002,21(1):126-129.
[3]葛邦,杨涛,高殿斌,李明.复合材料无损检测技术研究发展[J].玻璃钢/复合材料,2009,209(6):67-71.
[4]曾文曲,文有为,孙炜.分形小波与图像压缩[M].沈阳:东北大学出版社,1998.
[5]Ana Ivanovic,Richard D.Neilson.Influence of Geometry and Mate-rial Properties on the Axial Vibration of a Rock Bolt[J].Internation-al Journal of Rock Mechanics and Mining Sciences,2008,45(5):941-951.
[6]雷林源,杨长特.桩基瞬态动测响应的数学模型及基本特性[J].地球物理学报,1992,35(4):503-509.
[7]柳祖亭,顾利平,骆英等.桩基振动分析与质量监测[M].南京:东南大学出版社,1995.
[8]H.J.佩因著[英国],陈难先,赫松安译.振动与波动物理学[M].北京:人民教育出版社,1980.
[9]李青峰,茅献彪,徐金海等.预应力锚杆弹性波检测原理与应用[J].采矿与安全学报,2007,24(1):32-36.
[10]Ana Ivanovic,Andy Starkey,Richard D.Neilson,Albert A.Rod-ger.The Influence of Load on the Frequency Response of Rock BoltAnchorage[J].Engineering Software,2003,34(4):697-705.
[11]方括,张青,阎果华.应用ANSYS的复合材料层合板静强度和预测[J].玻璃钢/复合材料,2011,216(1):3-6.
[12]石博强,申焱华等.机械故障诊断的分形方法:理论与实践[M].北京:冶金工业出版社,2001.
[13]曹茂森,任青文,李妮.长度分形维的建立及其在工程检测中的应用[J].河海大学学报,2004,32(1):51-54.
[14]李张明,练继建,王生民等.基于分形维数的锚杆无损检测BP神经网络模型[J].天津大学学报,2008,41(9):1120-1123.
[15]曹茂森,任青文,万林海等.Length分形维算法拾取地震波初至[J].石油地球物理勘探,2004,39(5):509-514.
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