Department of Mechanical Engineering, University of Washington, Seattle, Washington 98105-6698, USA.
J Acoust Soc Am. 2011 Sep;130(3):1209-16. doi: 10.1121/1.3614540.
The underwater noise from impact pile driving is studied using a finite element model for the sound generation and parabolic equation model for propagation. Results are compared with measurements using a vertical line array deployed at a marine construction site in Puget Sound. It is shown that the dominant underwater noise from impact driving is from the Mach wave associated with the radial expansion of the pile that propagates down the pile after impact at supersonic speed. The predictions of vertical arrival angle associated with the Mach cone, peak pressure level as function of depth, and dominant features of the pressure time series compare well with corresponding field observations.
利用用于声产生的有限元模型和用于传播的抛物线方程模型研究了冲击打桩的水下噪声。结果与在普吉特海湾的一个海洋建筑工地部署的垂直线阵的测量结果进行了比较。结果表明，冲击驱动的水下噪声主要来自与桩的径向膨胀相关的马赫波，该波在冲击后以超声速沿桩向下传播。与马赫锥相关的垂直到达角、压力随深度的峰值水平以及压力时间序列的主要特征的预测与相应的现场观测结果非常吻合。
