期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 191, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2023.110146
关键词
Non-destructive testing; Material characterization; Lamb waves; Viscoelasticity; Semi-analytical finite elements (SAFE); Particle swarm optimization; Orthotropy
A two-stage inversion scheme is proposed to determine the complex-valued stiffness properties of orthotropic viscoelastic plates using their 3D surface velocity response. The hybrid TLS-ESPRIT and IWC method is used to extract the complex-valued wavenumber-frequency pairs corresponding to relevant Lamb wave and shear horizontal plate waves. Particle swarm optimization is employed to inversely determine the plate's orthotropic viscoelastic properties. Numerical simulations and experimental measurements validate the accuracy of the proposed method, showing a close agreement with the target values.
A two-stage inversion scheme is proposed to determine the full set of 9 complex-valued stiffness properties of orthotropic viscoelastic plates using their 3D surface velocity response to a broadband vibrational excitation. A combination of the hybrid TLS-ESPRIT and IWC method is employed to the extract complex-valued wavenumber-frequency pairs corresponding to relevant Lamb wave and shear horizontal plate waves from the data from surface velocity response. Particle swarm optimization is chosen to inversely determine the plate's orthotropic viscoelastic properties using the semi-analytical finite element method as a forward model to compute the real and imaginary parts of the wavenumbers. The inversion procedure first identifies the elastic parameters by matching the real wavenumber values, followed by the characterization of the viscoelastic properties which are merely linked to the imaginary wavenumber values. To validate the accuracy of the proposed method, a series of numerical simulations of 3D wavefield data using a finite element model (COMSOL) is conducted, as well as broadband experimental measurements obtained by means of a 3D Infrared Scanning Laser Doppler Vibrometer. It is shown that the inverted orthotropic viscoelastic properties based on the virtual wavefield data are in close agreement with the target values, showing a mean relative error of less than 2% and 5% error on the elastic and viscous properties, respectively. Additionally, the median absolute deviations are negligible, showing the robust convergence of the inversion procedure to a global minimum, and giving confidence to apply the method on experimental wavefield data in order to reveal the full (unknown) C-tensor for material characterization. The proposed characterization method can be used for various orthotropic viscoelastic materials, including metal sheets, carbon/epoxy laminates, and wooden plates.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据