水下双层圆柱壳体结构辐射噪声实时预报方法研究

根据Sommerfeld辐射条件和统计能量假设定义了具有方向性特征的声辐射系数,再结合声辐射效率特性定义了新的参数声辐射因子。在外壳体表面速度实时重构理论基础上提出了用声辐射因子实现水下双层圆柱壳体结构辐射噪声实时预报的方法,还提出了有限长水下圆柱壳体结构声辐射因子的试验测量方法。水下声学试验研究表明该方法预报的辐射声压与实测值吻合较好,能满足水下噪声预报的实时性、远场指向性和工况适应性等计算要求。

Calculation of noises from submerged cylindrical shell structure by radiation factor

Applied the statistical energy assumption and Sommerfeld radiation condition,the radiation coefficient was defined which have the directivity characteristic.Then combined with radiation efficiency,the radiation factor was defined.A real-time calculating method of radiation noise from submerged cylindrical double-shell structures is proposed in this paper.In the method,radiation noise was calculated by radiation factor of shell structures and reconstructing velocity field for outer shell.A test approach was also proposed to measure radiation factor of finite length cylindrical structures.The result of vibration and acoustics tests of submerged cylindrical double-shell show that the calculated radiation noise by this method can satisfy computation requirement of underwater radiation,such as rapidity,directivity and adaptability to operating condition.