基于有效线导纳的单筋圆柱壳振动声辐射分析

周向激励下加筋圆柱壳体振动和声辐射特性的研究是预测水下航行器壳体噪声的关键环节。基于有效线导纳理论和有效线导纳对简单圆柱壳体分析的基础，建立周向激励下单筋圆柱壳体的受力模型，得到振动响应计算公式，并对单筋圆柱壳体的振动响应和声辐射功率级进行实例计算和分析。计算结果表明：壳体表面加强筋处的局部振动响应得到有效抑制，幅度可降至原来的1％，但对整个壳体结构声辐射影响较小，功率仅降低1％左右。同时表明有效线导纳的理论能够正确有效地对周向激励下加筋圆柱壳体的振动响应和声辐射进行预报和分析。

Acoustics and Vibration Analysis of the Single Ring Stiffened Cylindrical Shell Based on the Effective Line Mobility Theory

Studies of the sound radiation and vibration of the ring stiffened cylindrical shell under the circumferential excitation are important to predict the noise of the underwater naval craft. Based on the effective line mobility theory and its application to the basic cylindrical shell, models of single ring stiffened cylindrical shells under the circumferential excitation are established, from which formulae of the vibration responses ~1are respectively deduced. Simulated calculation is carried out to analyze the vibration characteristics and the numeric radiation power level of the shell. Results show that the vibration response at the location of the ring can be restrained availably with its vibration amplitude down to 1% of the original value. However, the single stiffening ring has little influence on the sound radiation of the cylindrical shell. Only 1% power decrease is seen. It is concluded that the effective line mobility theory can be correctly and effectively applied in the sound and vibration prediction and analysis of the ring stiffened cylindrical shell under the circumferential excitation.