浮筏参数对船用离心泵振动特性的影响

为了研究浮筏参数对船用离心泵性能的影响,选择1台立式船用离心泵为研究对象.基于Kriging模型建立了浮筏正面开腔体的正长l1、侧长l2、正厚t1、侧厚t2、正宽w1、侧宽w 2与浮筏重量、泵振动特性之间的近似模型,其中12组数值方案由最优拉丁方方法确定.同时对浮筏质量最小和最大振动烈度最小的2种方案进行了振动特性分析.研究结果表明:l1和t2对浮筏质量影响最大;随着l1增大,浮筏质量先减小后增大;随着t2增大,浮筏质量先增大后减小,接着再增大后减小;t2对浮筏振动烈度的影响不大;随着l1,w1,t1,l2和w2增大,浮筏的振动烈度都是先减小后增大;浮筏最大振动烈度最小和质量最小的2种方案使得振级落差均获得显著提升,振级落差由14.2 dB分别提升到22.6和21.8 dB.

Influence of geometrical parameters of vibration damping raft on vibration characteristics of marine centrifugal pump

A vertical marine centrifugal pump was selected as research object for a better understanding of influence of geometrical parameters of a vibration damping raft on performance of the pump.An approximate model of pump vibration characteristic and raft mass was established based on the Kriging model in terms of front cavity length l1,width w1,thickness t1,lateral cavity length l2,width w2,thickness t2.Twelve numerical experimental designs were generated by using the Latin Hypercube method and the vibration characteristics of two rafts respectively with the lightest mass and the minimal vibration intensity were analyzed.The results show that l1 and t2 affect the mass of raft most significantly.With the increase of l1,the mass of raft decreases first and then rises.With the increase of t2,the mass of raft increases first and then two peaks appear.t2 shows a slight effect on the vibration intensity.The vibration intensity of raft all decreases first and then increases with increasing l1,w1,t1,l2 and w2.The vibration attenuation with the lightest mass and the minimal vibration intensity are signi-ficantly improved,as a result,the vibration attenuation increases to 22.6 dB and 21.8 dB,respectively,from 14.2 dB.