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BOUNDARY INTEGRAL FORMULATIONS FOR NOISE SCATTERED BY HELICOPTER FUSELAGE

机译:用直升机机身散射噪声的边界积分制剂

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The paper deals with a theoretical-numerical comparison among integral formulations for the prediction of noise scattered by moving bodies. Three acoustic scattering integral formulations for the solution of the velocity potential wave equation are considered: a recently proposed linearized boundary-field integral formulation, and two widely applied boundary integral approaches based on Taylor and Taylor-Lorentz transformations. Aim of the work is to highlight their theoretical differences and limits of applicability, while examining their capability of capturing the influence of body motion and corresponding nonuniform mean flow around it on the scattered noise field. Numerical results concern a rigid translating sphere impinged by sound waves emitted by a co-moving pulsating point-source and a helicopter fuselage impinged by noise radiated by main- and tail-rotor.
机译:本文对由移动体散射的噪声预测的整体配方之间的理论 - 数值比较。考虑了用于速度势波方程溶液的三种声学散射积分制剂:最近提出的线性化边界 - 场积分制构,以及基于泰勒和泰勒 - 洛伦兹转换的两个广泛应用的边界整体方法。该工作的目的是突出其理论差异和适用性的限制,同时检查它们在散射噪声场上捕获身体运动和相应的不均匀平均流动的能力。数值结果涉及由共移动脉动点源和由主和尾转子辐射的噪声冲击的直升机机身撞击的刚性平移球体。

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