Numerical Study of Stern Vibration of a Self-Propulsion Ship in Propeller Induced Pressure Fluctuation

doi:10.16183/j.cnki.jsjtu.2021.175

Abstract

Abstract:

To study the stern vibration characteristics of the ship sailing in still water under the action of propeller induced pressure fluctuation, the propeller self-propulsion numerical simulation was conducted based on the Reynolds-averaged Navier-Stokes (RANS) method, in combination with the shear-stress transport (SST) k-ω model. Taking the obtained fluctuating pressure on the hull surface as the external excitation, the acoustic-structure coupling calculation was performed through the structural finite element model coupled with the flow field boundary element model, and a numerical prediction method for the stern vibration of the self-propulsion ship excited by the propeller surface force was established. By analyzing the fluctuating pressure characteristics in the time domain and frequency domain, it is found that the amplitude of the blade frequency component is much larger than that of other frequency components. For the right-handed propeller, the starboard side pressure amplitude above the propeller is higher than that on the port side. The analysis of the corresponding relationship between the propeller fluctuating pressure, the structural inherent characteristics, and the vibration response shows that the coupled mode natural frequency should be far away from the propeller excitation force frequency to reduce the vibration response. The exploration of the effect of modifying stern structure on the vibration response at the same excitation indicates that increasing the plate thickness or installing stiffeners can change the inherent characteristics of the structure, thus avoiding resonance and achieving the vibration reduction effect.

Key words: propeller induced pressure fluctuation, stern vibration, numerical methods, ship self-propulsion, vibration reduction

CLC Number:

U661.44

QIN Guangfei, YAO Huilan, ZHANG Huaixin. Numerical Study of Stern Vibration of a Self-Propulsion Ship in Propeller Induced Pressure Fluctuation[J]. Journal of Shanghai Jiao Tong University, 2022, 56(9): 1148-1158.

Figures/Tables 19

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KCS参数	取值	KP505参数	取值
航速/(m·s^-1)	2.1964	直径/mm	250
船长/m	7.2786	毂径比	0.180
船宽/m	1.0190	桨叶数	5
型深/m	0.6013	盘面比	0.800
吃水/m	0.3418	平均螺距比	0.950
雷诺数	1.4×10⁷	旋向	右旋
弗劳德数	0.26	叶切面形状	NACA66

参数	数值结果	实验数据	偏差/%
C_T	3.997	3.966	0.78
K_T	0.163	0.170	-4.12
10K_Q	0.297	0.288	3.12

阶数	干模态固有频率/Hz	耦合模态固有频率/Hz
1	58.1	46.8
2	62.9	58.3
3	69.5	62.9
4	70.8	63.1
5	86.3	69.6
6	92.8	70.5
7	95.5	74.3
8	98.7	86.3
9	112.2	92.6
10	133.8	95.5

阶数	模型I		模型II			模型III			模型IV			模型V			模型VI
	d/mm	加强筋	d/mm		加强筋	d/mm		加强筋	d/mm		加强筋	d/mm		加强筋	d/mm		加强筋
	4.0	无	4.5		无	5.0		无	5.5		无	4.0		有	5.5		有
1	46.8			51.0			54.9			58.6			53.1			63.0
2	58.2			65.5			72.8			80.0			63.6			86.3
3	62.9			70.6			78.3			86.1			71.8			92.6
4	63.1			71.5			79.9			88.5			73.8			98.5
5	69.6			78.3			87.0			95.5			83.0			104.7
6	70.5			79.1			87.5			95.7			86.8			110.6
7	74.3			82.3			90.3			98.5			89.7			112.9
8	86.3			97.0			107.6			118.3			95.4			130.2
9	92.6			104.0			115.3			126.4			100.8			137.9
10	95.5			107.4			119.3			131.2			110.7			144.7

频率	模型I		模型II			模型III			模型IV			模型V			模型VI
	d/mm	加强筋	d/mm		加强筋	d/mm		加强筋	d/mm		加强筋	d/mm		加强筋	d/mm		加强筋
	4.0	无	4.5		无	5.0		无	5.5		无	4.0		有	5.5		有
f_BPF	-1.5			7.4			15.6			23.4			11.8			32.6
f_2BPF	0.5			2.1			4.9			0.5			0.4			3.7