Experimental study of cavitation vibration characteristics of water jet propulsion pump based on improved variational modal decomposition SSA-VMD

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (12) : 212-219.

FENG Chao,LIANG Jun,TAO Jin,ZHU Hualun*,WANG Zhekai

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Abstract

Cavitation, one of destabilizing factors in the operation of water jet propulsion pumps, not only induces a drop in hydraulic performance, but also 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. Effective access to the vibration energy change law, and spectral energy distribution of characteristic measurement point and axial under two states. The results provide reference and an fast and effective method 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.

Key words

cavitation / vibration / water jet propulsion pump;variational mode decomposition（VMD) / high speed camera

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FENG Chao, LIANG Jun, TAO Jin, ZHU Hualun, WANG Zhekai. Experimental study of cavitation vibration characteristics of water jet propulsion pump based on improved variational modal decomposition SSA-VMD[J]. Journal of Vibration and Shock, 2025, 44(12): 212-219

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