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中文核心期刊

冰层导波质点振动轨迹特性分析

Characteristics analysis of the particle motion trajectories of ice-guided waves

  • 摘要: 为加强对冰层导波的了解与应用, 本研究在青海湖结冰期, 利用三轴检波器和锤击声源进行了冰层导波激发实验。通过理论推导、仿真分析和实验验证, 详细阐述了冰层导波质点振动轨迹的椭圆偏振特性和指向特性。研究结果表明: 冰层中, 波数虚部接近于0, 可远距离传播的冰层导波的振动质点在冰层上表面做椭圆偏振运动; 此外, M1模态冰层导波的振动质点总是相对于声波的传播方向做逆时针转动, M2模态则做顺时针转动, 具有明显的指向特性。冰层导波的椭圆偏振特性和指向特性将为冰层覆盖环境中的声源方位估计提供重要参考。

     

    Abstract: In order to enhance the realization and application of the ice-guided waves, this study conducted ice-guided waves excitation experiments using triaxial geophones and hammered sound sources during the ice-covered period of Qinghai Lake. The elliptical polarization and directional characteristics are described in detail by theoretical derivation, simulation analysis and experimental verification. The results of research indicate that within the ice layer, the vibrational particles of the ice-guided waves, which have an imaginary part of the wavenumber close to zero and can propagate over long distances, undergo elliptical polarization motion on the upper surface of the ice layer. Moreover, the vibrational particles of the M1 mode ice-guided waves always rotate counterclockwise relative to the direction of sound wave propagation, while those of the M2 mode rotate clockwise, demonstrating a distinct directional characteristic. It is no doubt that the elliptical polarization and directional characteristics of the particle motion trajectories of ice-guided waves will provide a method basis for the estimation of the bearing of sound source.

     

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