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The vibration isolation performances of typical hull structure with viscoelastic interlayer are analyzed ac-cording to wave theory, and the influences of interlayer Young's modulus and length on the vibration reduction are dis-cussed. The theoretical analysis shows that combination of polyurethane interlayer with blocking mass can enhance the vibra-tion isolation performance and expand isolation frequency band. In order to verify the effectiveness of polyurethane interlay-er, the model test of power cabin's vibration is carried out. The test data shows that the reduction of 20–1000 Hz variation acoustic level at hull shell is more than 5 dB. 相似文献
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阻振质量参数对动力舱段隔振性能影响规律研究 总被引:1,自引:0,他引:1
Rigid blocking masses are located in the typical base structure of a power cabin based on the impedance mismatch principle.By combining the acoustic-structural coupling method and statistical energy analysis,the full-band vibration and sound radiation reduction effect of vibration isolation masses located in a base structure was researched.The influence of the blocking mass’ cross-section size and shape parameters and the layout location of the base isolation performance was discussed.Furthermore,the effectiveness of rigid vibration isolation design of the base structure was validated.The results show that the medium and high frequency vibration and sound radiation of a power cabin are effectively reduced by a blocking mass.Concerning weight increment and section requirement,suitably increasing the blocking mass size and section height and reducing section width can result in an efficiency-cost ratio. 相似文献
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该文针对舰船建造阶段声学故障诊断阈值与历史实测数据缺乏内在联系的问题,以离心泵系统为研究对象,围绕基于振动阈值的舰船离心泵系统声学故障诊断开展研究。首先,通过实船测试数据分析得出船舶离心泵系统由于边界条件差异及设备差异导致振动特性波动最大超过10 dB;其次,对振动偏离值进行正态分布假设,并通过对实测数据的统计分析进行验证;最后,根据正态分布区间估计原理提出阈值提取方法,在此基础上通过模拟试验对以上阈值的有效性进行验证,结果显示,该方法提取的阈值对正常工况的诊断准确率为99.45%,对故障工况诊断准确率为92.3%,该文研究成果可为船舶建造阶段离心泵系统提供一种合理可操作、准确率较高的声学故障诊断方法。 相似文献
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以舰船流固声耦合理论为基础,基于势流理论,开发了工程化的舰船湿模态附连水质量三维计算程序,将计算值与理论值、经验值及有限元数值解进行对比分析,验证了程序的有效性和合理性。在此基础上,提出了一种计及流固耦合效应的舰船"声平衡"分析方法,研究了船—机—桨多点激励下船体—基座—设备间的耦合结构振动和水下声辐射。结果表明:舰船艏部自噪声随振源相对位置变化出现峰谷交替的趋势,通过优化主机位置可以降低艏部自噪声;舰船主辅机选型应充分考虑船体—基座—设备之间以及设备间的声匹配,兼顾多点激励力幅比和激励频率比。 相似文献
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动力设备周围阻振质量闭式回路隔振特性研究 总被引:1,自引:1,他引:0
基于波动理论分析了T型板架中阻振质量对振动波传递的阻抑特性,推导了阻振质量的隔振度公式,给出了振动波入射角度、阻振质量截面参数对其隔振性能的影响规律。在此基础上,基于阻抗失配原理将环形阻振质量回路、矩形阻振质量回路引入双壳动力段动力设备周围结构的刚性隔振动设计中,给出了艇体铺板结构阻振质量刚性隔振设计原则。结果表明阻振质量闭式回路能有效降低动力舱段的振动及声辐射。 相似文献