Numerical prediction of effective wake field for a submarine based on a hybrid approach and an RBF interpolation

Rao, Zhiqiang; Yang, Chen-Jun

doi:10.1016/s1001-6058(16)60781-3

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…This result further confirms the present methods and codes. The wake of a SUBOFF submarine 32 is implied here to investigate the fluid-structure interaction problem of elastic propellers by applying different boundary conditions. The combined time-frequency domain boundary element and finite element methods have been applied to obtain the dynamic responses of the propeller 4381 as shown in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

Dynamic responses of elastic marine propellers in non-uniform flows

Chen

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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This paper focuses on the development of a three-dimensional panel method in time and frequency domains combined with the finite element method for analyzing the hydroelastic responses of rotating marine propellers in the wake of ships. A fully non-penetration boundary condition imposed on the deformed blade surface is conducted, in which the corrections of both the incoming flow velocities and the normal vectors imposed on the deformed and undeformed blade surface are taken into account. The added-mass and -damping matrices due to strongly coupled fluid-structure interaction are considered. Results of the present method are compared with experimental data available in the literature. It is observed that the fully non-penetration boundary condition applied on the deformed blade surface should be imposed to predict the unsteady performance of elastic propellers, which is due to the change of the added damping predicted by considering different non-penetration boundary conditions.

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Section: Resultsmentioning

confidence: 99%

Dynamic responses of elastic marine propellers in non-uniform flows

Chen

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…Therefore, improving the quality of the submarine wake field by optimizing the layout and structure of the SCSs is an important research direction which is indispensably linked to the design of submarine vibration and noise reduction strategies. Research on submarine wake field characteristics concerns a comprehensive assessment of existing submarines and new technical approaches for developing future submarine SCSs [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flow Field, Force, and Moment Measurements of Submarines with Different Stern Control Surfaces

Ke,

Ye,

Liang

2023

JMSE

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Flow field performance tests of submarine models with cross-rudder and X-rudder stern control surfaces were conducted to study X-rudders’ performance in non-uniform flow fields. The tests compared performance parameters such as resistance, lateral steering force, yaw moment, stern velocity field, and flow field inhomogeneity coefficient under low- and high-speed conditions. The test results show that, at low speed, the resistance of the X-rudder submarine is smaller than that of the cross-rudder one at the same rudder angle. In contrast, at high speed, the resistance of the cross-rudder submarine is smaller than that of the X-rudder submarine. Under low- and high-speed conditions, the X-rudder’s lateral steering force and yaw moment are larger than those of the cross rudder at the same rudder angle. The superiority of the maneuverability of the X-rudder becomes more apparent with increasing rudder angle. At a rudder angle of 10°, the X-rudder’s lateral steering force and yaw moment are about two times larger than the cross rudder’s. In the small-radius area of the propeller plane, the inhomogeneity coefficient of the X-rudder is generally smaller than that of the cross rudder. This is probably because the cross-rudder stern control surfaces have fixed stabilizers with flaps, and the X-rudder stern control surfaces are all-moving, with a small fixed part next to the submarine. This test provides a reference for designing the stern control surface of low-noise submarines.

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“…Requia et al (2019) suggested that hybrid interpolation and machine learning methods can estimate the PM2,5 constituent over space (Requia et al, 2019). In submarine field, Rao and Yang (2017) used hybrid RBF Interpolation and numerical prediction for a submarine (Rao and Yang, 2017).…”

Section: A Introductionmentioning

confidence: 99%

Application of Artificial Neural Network in Predicting Direct Economic Losses Due to Earthquake

Azmi,

Soehardjoepri,

Prihandoko

et al. 2023

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Accurately predicting the direct economic losses caused by earthquakes is important for policy makers for disaster budgets. Before a disaster strikes, it is important to consider the public policy costsassociated with disaster relief and recovery. The aim of this study is to provide a risk assessment approach, which can benefit all parties involved. Artificial neural networks are widely used for time seriesforecasting, especially financial forecasting. Therefore, this study proposes a cutting-edge forecastingmethod such as backpropagation neural network (BPNN) and other prediction methods: neural networkautoregressive (NNAR) and ARIMA-GARCH to obtain the best prediction results. This paper appliesinterpolation data to increase the amount of data used. Two interpolations were applied to amplify theoriginal small sample with virtual points, namely cubic splines and further piecewise interpolation using. The results of this study are the cubic spline interpolation is the most effective way to solve thesmall sampling problem to predict direct economic losses due to the Indonesian earthquake and theBPNN method outperforms other traditional methods with an RMSE of 0.024 in the training period and0.174 in the testing period, significantly lower than other methods. The results of this research can beused as reference material for the government in estimating the level of earthquake losses and can beused to develop risk reduction strategies

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Numerical prediction of effective wake field for a submarine based on a hybrid approach and an RBF interpolation

Cited by 13 publications

References 9 publications

Dynamic responses of elastic marine propellers in non-uniform flows

Dynamic responses of elastic marine propellers in non-uniform flows

Experimental Study on the Flow Field, Force, and Moment Measurements of Submarines with Different Stern Control Surfaces

Application of Artificial Neural Network in Predicting Direct Economic Losses Due to Earthquake

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