摘要
空化作为喷水推进泵运行失稳因素之一,不仅诱导水力性能陡降,还引发振动噪声,为提升空化致振信号解析精度,在变分模态分解(variational mode decomposition,VMD)基础上,以最小排列熵系数为适应度函数,改进模态个数及惩罚参数确定方式,提出SSA-VMD集成算法,其次开展空化可视化与多源振动信号同步采集试验,对空化过程中泵体振动信号进行SSA-VMD分解,计算信号总能量、分量能量、相关性,从而获取空化过程中泵体振动能量变化规律,及扬程即将与开始下降状态,特征测点及其轴向的振动频谱能量分布特性,该结果为喷水推进泵空化预报及振动机理试验研究,提供参考以及一种收敛速度较快、有效突出特征的振动信号解析方法,对保障喷水推进舰船的高效稳定航行具有实际意义。
Cavitation,one of destabilizing factors in the operation of water jet propulsion pumps,induces a drop in hydraulic performance and triggers vibration and noise.For improving the resolution accuracy of cavitation vibrational signal,SSA-VMD integration algorithm was proposed on the basis of VMD with the minimum arrangement entropy coefficients as fitness function,and the identification of modes number and penalty parameter was improved.Cavitation visualization and simultaneous acquisition of vibration signals from multiple sources were then tested.SSA-VMD decomposition,total energy,component energy,and correlation calculations of vibration signal were performed,to obtain the vibration energy change law,and spectral energy distribution of characteristic measurement point and axial under two states.The study provides an effective method that converges quickly for experimental study of cavitation prediction and vibration mechanism,which is of practical significance for guaranteeing efficient and stable navigation of water jet propulsion ships.
作者
冯超
梁珺
陶金
朱华伦
王哲恺
FENG Chao;LIANG Jun;TAO Jin;ZHU Hualun;WANG Zhekai(Marine Design and Research Institude of China,Shanghai 200011,China)
出处
《振动与冲击》
北大核心
2025年第12期212-219,共8页
Journal of Vibration and Shock
关键词
空化
振动
喷水推进泵
变分模态分解(VMD)
高速摄像
cavitation
vibration
water jet propulsion pump
variational mode decomposition(VMD)
high speed camera
