结构损伤识别中噪声的模拟
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摘要
在有限元仿真的结构振动信号上施加不同水平的噪声,采用随机子空间法,分别从各种噪声水平的信号中提取结构的模态参数。以无噪声信号得到的模态参数为标准值,计算了各信号噪声水平下模态参数的误差,得到了信号噪声水平与模态参数噪声水平的对应关系,给出了模拟模态参数噪声的方式。通过损伤识别算例,考察了识别效果对信号信噪比的要求。
By utilizing the stochastic subspace identification,modal parameters were extracted from simulated vibration signals contaminated by specified levels of noise.With the modal parameters identified from the signal without noise being as the standard,the errors of modal parameters from signals polluted by various levels of noise in relation to the standard were obtained.So the error,i.e,the modal parameter noise,was related to the noise level of signals.A reasonable procedure of simulating noise of modal parameters was put forward.The requirement of damage identification for the signal noise ratio was also studied based on simulations.
By utilizing the stochastic subspace identification,modal parameters were extracted from simulated vibration signals contaminated by specified levels of noise.With the modal parameters identified from the signal without noise being as the standard,the errors of modal parameters from signals polluted by various levels of noise in relation to the standard were obtained.So the error,i.e,the modal parameter noise,was related to the noise level of signals.A reasonable procedure of simulating noise of modal parameters was put forward.The requirement of damage identification for the signal noise ratio was also studied based on simulations.
引文
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[2]张连振,黄侨,郑一峰,等.桥梁结构损伤识别理论的研究进展[J].哈尔滨工业大学学报,2005,37(10):1415-1419.
[3]袁颖,林皋,周爱红,等.基于不完备模态测试信息的结构损伤识别方法研究[J].大连理工大学学报,2007,47(5):693-698.
[4]Sun Z,Chang C C.Structural Damage Assessment Based onWavelet Packet Transform[J].Journal of Structural Engineer-ing,2002,128(10):1354-1361.
[5]王柏生,倪一清,高赞明.用概率神经网络进行结构损伤位置识别[J].振动工程学报,2001,14(1):60-64.
[6]Ren W X,De Roeck G.Structural Damage Identification u-sing Modal Data.I:Simulation Verification[J].Journal ofStructural Engineering,2002,128(1):87-95.
[7]张德文,魏阜旋.模型修正与破损诊断[M].北京:科学出版社,1999.
[8]瞿伟廉,彭琦.桅杆结构竖向杆件损伤位置识别的时域方法[J].地震工程与工程振动,2007,27(5):110-116.
[9]Van Overschee P,De Moor B.Subspace Identification forLinear Systems:Theory,Implementation,Applications[M].Dordrecht,the Netherlands:Kluwer AcademicPublishers,1996.
[10]曹晖,张新亮,等.采用改进单元刚度折减系数法识别结构损伤[J].振动与冲击,2008,27(6):132-135.
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