摘要
为降低双层圆柱壳的辐射噪声,基于阻尼减振原理,从抑制声桥振动能量传递入手,通过结构增阻技术在壳间声桥中设计了金属-橡胶层叠复合阻尼肋板;考虑粘弹性材料的频变特性,数值计算了肋板型式改进前后双层壳振声性能,分析了层叠阻尼肋板参数变化对双层壳振声性能的影响.研究表明:壳间声桥采用金属-橡胶层叠复合阻尼钢板能有效衰减振动能量的传递,降低双层壳辐射噪声;减小阻尼层储能模量有更好的减振降噪效果;随着频率的增大,提高材料的阻尼对降低中高频线谱峰值更有效;阻尼层的厚度选择既要保证结构的总体刚度,又要尽量增大阻尼层以提高能量耗散能力.
To reduce sound radiation of double cylindrical shell, metal-rubber laminated composite damping annular plates were designed by the technology of resistance increasing based on the principle of damping vibration attenuation. Considering the frequency varied characteristics, the vibro-acoustic characteristics of double cylindrical shell with annular plate designed before and after were analyzed by numerical calculation. Finally, the effects of varied parameters of laminated damping annular plate on vibro-acoustic characteristics of cylindrical shells were analyzed. The results shows that.. Mental-rub- ber laminated composite damping steel applying in acoustic bridge can attenuate vibrational energy transfer and reduce sound radiation from double cylindrical shell effectively, decreasing modulus of damping layer material properly has a better effects of high frequency vibration and noise reduction. Improving damping is more effective on reducing peak value of line spectrum when frequency increas- ing. The thickness of damping layer is not only need to guarantee the whole stiffness of the structure, but also increase the thickness as much as possible to improve energy dissipation capability.
出处
《武汉理工大学学报（交通科学与工程版）》
2013年第2期321-325,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国防科技预研基金项目资助(批准号:4011101020101)
关键词
阻尼肋板
双层圆柱壳
结构增阻
声桥设计
减振降噪
damping annular plate
double cylindrical shell
structure impedance increasing
acoustic bridge design
vibration and noise reduction
