Floating Raft Vibration Isolation Design and Sensitivity Analysis of Raft Parameters for Pumps in Reactor System
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摘要: 反应堆系统泵类设备是船舶核动力装置重要的振动噪声源，目前实际工程中多数采用单层隔振措施，减振效果有限，为满足总体振动噪声控制的新要求，引入了浮筏隔振技术，但反应堆系统浮筏隔振技术刚起步，还停留在满足基本布置及减振需求的简单式筏架结构上，对筏架自身结构参数的研究较少。本文首次针对反应堆系统泵类设备开展筏架多样化结构设计，提出了3种不同的筏架结构，并进行了综合性能对比，掌握了不同筏架结构特点，并针对低频减振效果较好的框架式筏架结构开展了参数敏感性研究，获取了筏架刚度参数与质量参数对浮筏隔振系统减振效果的影响规律，为反应堆系统泵类设备浮筏结构选型及设计提供理论支撑。Abstract: Pump equipment in reactor system is an important source of vibration and noise for marine nuclear power plant. At present, single-layer vibration isolation measures are mostly adopted in practical engineering, and the damping effect is limited. In order to meet the new requirements of vibration and noise control, floating raft isolation technology has been introduced. However, the floating raft isolation technology in the reactor system has just started, and it still stays on a simple raft structure that meets the basic layout and vibration reduction requirements. There is little research on the structural parameters of the raft itself. This article is the first to carry out diversified structural design of raft structures for reactor system pumps. Three different raft structures are proposed and their comprehensive performance is compared. The characteristics of different raft structures are mastered, and parameter sensitivity research is conducted on the plate raft that has good low-frequency vibration reduction effect. The influence of raft stiffness parameters and mass parameters on the vibration reduction effect of floating raft isolation systems is obtained, which provides theoretical support for the selection and design of floating raft structures for reactor system pumps.
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图 5 不同筏架结构形式的浮筏减振效果对比
Figure 5. Comparison of Vibration Reduction Effects of Different Floating Rafts
图 7 不同筏架质量的浮筏隔振系统减振效果对比
Figure 7. Comparison of Vibration Reduction Effects of Floating Raft Isolation Systems with Different Raft Masses
图 8 不同筏架质量的基座振动加速度响应对比
Figure 8. Comparison of Vibration Acceleration Response of Bases with Different Raft Masses
图 9 不同筏架刚度下浮筏隔振系统减振效果对比
Figure 9. Comparison of Vibration Reduction Effects of Floating Raft Isolation Systems with Different Raft Stiffness
图 10 不同筏架刚度下基座振动响应对比
Figure 10. Comparison of Vibration Response of Bases with Different Raft Stiffness
图 11 筏架弹性模量参数和密度对减振效果影响规律
Figure 11. Influence of Elastic Modulus and Density of Raft on Vibration Reduction Effect
表 1 不同浮筏筏架结构综合性能对比结果
Table 1. Comparison Results of Comprehensive Performance of Different Floating Rafts
对比参数 框架式筏架 桁架式筏架 周期式筏架 筏架结构尺寸 1900 mm×900 mm×380 mm 1900 mm×900 mm×380 mm 1900 mm×900 mm×380 mm 筏架结构质量/kg 1086 585 930 第一阶固有频率/Hz 172.2 159.6 184.5 加工难度 较简单，易加工 相对复杂 加工复杂，需采用增材制造等技术 减振性能 10~520 Hz 最好 一般 较好 520~1100 Hz 较差 较好 较好 1100~1900 Hz 最好 一般 一般 1900~2000 Hz 一般 一般 较好 10~2000 Hz 48.8 dB 47.3 dB 50.4 dB 
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