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中文核心期刊

冰层导波频散特性及参数反演实验研究

Dispersion characteristics of guided waves in ice layers and experimental study of parameter inversion

  • 摘要: 为高效准确地获得冰层厚度和力学参数, 研究了利用导波反演冰层参数的可行性。首先采用各向同性海冰波导模型, 计算了冰层泄漏导波的频散曲线。通过对冰层波导声传播特性及参数敏感性的分析, 分别在实验室和青海湖开展了实验, 通过在冰面上布置单发多收阵列获取冰面导波信号, 以此提取导波频散曲线。理论及实验结果表明: QS、QA0和QS0三个模态均对冰层厚度变化敏感; QS0模态对冰层杨氏模量和泊松比的变化敏感, QS和QA0模态对其变化不敏感。在实验室内, 利用QS0模态成功反演了冰层的杨氏模量、泊松比及冰厚度, 分别为7.323 ± 0.154 GPa, 0.361 ± 0.01, 39.31 ± 0.36 mm; 野外实验成功捕捉了QS模态, 并利用其反演了冰层厚度, 反演误差小于5%。该研究为进一步开展大规模冰层野外实验及参数反演奠定了基础。

     

    Abstract: To efficiently and accurately determine ice thickness and mechanical parameters, the feasibility of inverting ice layer parameters using guided waves is investigated. An isotropic sea ice waveguide model is first adopted to compute the dispersion curves of leaky guided waves in the ice layer. By analyzing the acoustic propagation characteristics and parameter sensitivity of the ice waveguide, experiments are conducted both in a laboratory and in Qinghai Lake. A single-shot multi-receiver array is deployed on the ice surface to capture guided wave signals, from which dispersion curves are extracted. Theoretical and experimental results indicate that the QS, QA0, and QS0 modes are all sensitive to variations in ice thickness. The QS0 mode exhibits sensitivity to changes in Young’s modulus and Poisson’s ratio, whereas the QS and QA0 modes are insensitive to these parameters. In the laboratory, the QS0 mode is successfully utilized to invert the Young’s modulus, Poisson’s ratio, and ice thickness, yielding values of 7.323 ± 0.154 GPa, 0.361 ± 0.01, and 39.31 ± 0.36 mm, respectively. In the field experiment, the QS mode is successfully captured and used to invert ice thickness, with an inversion error of less than 5%. This study lays the foundation for large-scale field experiments and parameter inversion of ice layers.

     

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