Estimation of Viscous Damping Parameters of Fibre Reinforced Plastic Plates using Finite Element Model Updating

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI:10.20855/IJAV.2018.23.11064

S. Mondal, S. Chakraborty

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引用次数: 2

Abstract

A combined numerical-experimental technique has been implemented using the finite element model updating technique to estimate a set of proportional viscous damping parameters for determining the global responses of fibre reinforced plastic (FRP) plates over a chosen frequency range of interest. The experimentally determined frequencies and mode shapes are used to update the homogenised anisotropic in-plane material constants, before estimating the damping parameters from the directly observed frequency response functions (FRFs). Gradient based inverse sensitivity method has been implemented for the parameter estimation. Existing FRP structures may degrade considerably due to environmental effects over the long period of existence—changing the material and damping properties significantly compared to their initial values after fabrication—thus requiring updating. The estimated viscous damping parameters using the current technique reproduces higher values of modal damping factors for FRP plates. For nonviscous damping, estimation of a set of relaxation factors produces a more realistic estimate of modal damping factors. Increased value of the relaxation factors make the model coincide with the viscous one. A numerically simulated plate problem has been presented along with the experimental validation.

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基于有限元模型修正的纤维增强塑料板粘滞阻尼参数估计

采用有限元模型更新技术，采用数值与实验相结合的方法估计了一组比例粘性阻尼参数，用于确定纤维增强塑料(FRP)板在选定的感兴趣频率范围内的整体响应。在从直接观测到的频响函数(frf)估计阻尼参数之前，使用实验确定的频率和模态振型来更新均匀的各向异性面内材料常数。采用基于梯度的逆灵敏度法进行参数估计。由于长期存在的环境影响，现有FRP结构可能会严重退化——与制造后的初始值相比，材料和阻尼性能会发生显著变化——因此需要更新。使用当前技术估计的粘性阻尼参数再现了FRP板的更高的模态阻尼系数值。对于非粘性阻尼，一组松弛因子的估计产生了更真实的模态阻尼因子估计。松弛因子的增大使模型与粘性模型吻合。给出了一个数值模拟的平板问题，并进行了实验验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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