CAJ | 학술논문

文章研究了多源随机激励下多舱段圆柱壳的辐射声功率合成规律.在水下多舱段壳体振动声辐射数值计算模型的基础上,采用统计方法处理多源随机激励的辐射声功率.讨论了源的相干性、激励位置、间距和舱壁对总辐射声功率的影响.数值计算表明:在声波波长大于壳体一半长度的低频段,无论两个源是否位于同一舱段都要考虑源的相干性影响;在环频率以上的高频段源相干性的影响可以忽略,多个源随机激励满足能量叠加原理;而在中频段可以只考虑位于同一舱段内源的相干性的影响.
문장연구료다원수궤격려하다창단원주각적복사성공솔합성규률.재수하다창단각체진동성복사수치계산모형적기출상,채용통계방법처리다원수궤격려적복사성공솔.토론료원적상간성、격려위치、간거화창벽대총복사성공솔적영향.수치계산표명:재성파파장대우각체일반장도적저빈단,무론량개원시부위우동일창단도요고필원적상간성영향;재배빈솔이상적고빈단원상간성적영향가이홀략,다개원수궤격려만족능량첩가원리;이재중빈단가이지고필위우동일창단내원적상간성적영향.
The synthesis law of the radiated sound power from the bulkheaded finite cylindrical shell driven by multiple stationary random point forces is analyzed.Based on the vibro-acoustic numerical calculation model for the submerged bulkheaded cylindrical shell the expected value of the radiated sound power is derived by using of the statistical method.The effects of the source coherence,excitation location and spacing between the sources and the bulkheads on radiated sound power are discussed.The numerical results show that the effects of the source coherence,location and spacing must be taken into account at low frequencies when the acoustic wavelength in water is longer than half the cylindrical shell length.The effect of the source coherence can be neglected and the principle of energy superposition is valid at high frequencies above the ring frequency.At medium frequencies,the effect of the source coherence would be considered only when the sources are located at same cabin.