反应堆结构的泵致振动噪声研究

Study on Pump Induced Vibration Acoustics of Reactors

先进的振动噪声预报与减振降噪分析技术对于降低结构的振动噪声水平具有重要意义。为了进行准确的噪声预报,需要采用合适的方法并建立噪声预报模型进行计算分析。针对反应堆及一回路系统,首先研究了振动噪声预报分析方法的变量参数及其影响规律,研究比较了声学分析方法包括直接边界元法、声学有限元自适应层方法、自适应阶次有限元声学法、声学有限元自适应层方法联合自适应阶次有限元声学法;其次,联合有限元法和声学边界元法,研究了耐压壳模型对振动噪声的影响,得到了加强筋、双层壳对系统振动特性及辐射噪声的影响规律。基于研究结果,建立了声振计算模型,开展了减振效果评价、声辐射分析及减振措施研究,得到了典型传递路径的振级落差、通过耐压壳辐射的声压级和外声场以及不同减振措施的减振降噪效果。

Advanced analysis methods for prediction and reduction of vibration and noise are of great significance for reducing vibration noise level of the structure. In order to make accurate noise prediction, it is necessary to adopt the appropriate method and establish the model of noise prediction. Firstly, the variable parameters and their influence law of vibration noise prediction and analysis method, for reactor and the primary loop system, are studied. Comparative studies are made on the acoustic analysis methods including direct boundary element method, acoustic finite element automatic matching layer method, acoustic finite element method adaptive order, and acoustic finite element automatic matching layer method combined acoustic finite element method adaptive order. Secondly, the effect of pressure hull on the vibration noise is studied by the finite element method and the acoustic boundary element method. Meanwhile, the effect of reinforcing rib and double shell on the system vibration characteristics and radiated noise is obtained. Based on these studies, a vibration-acoustic model is established. Then, the research of vibration reduction evaluation, acoustic radiation analysis, vibration and noise reduction are carried out. The vibration level difference of typical transfer path, the sound pressure level and the external acoustic field radiated by the pressure hull, and the effect of vibration and noise reduction with different vibration reduction measures are obtained.