An initial evaluation of the free surface effect on the maneuverability of underwater vehicles

Amiri, Mojtaba Maali; Esperança, Paulo T. T.; Vitola, Marcelo A.; Sphaier, Sergio H.

doi:10.1016/j.oceaneng.2019.106851

Cited by 26 publications

(14 citation statements)

References 17 publications

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“…The simple vehicle geometry is widely acknowledged to be unrealistic (the fairwater is too small, the torpedo is a simple revolution body, and it has small stern planes and no bow control surfaces) and course unstable. Very few attempts of manoeuvre simulation have been done, resulting in a large spread of results due to its strongly unstable property [51,52]. The second vessel, called the SWE, is a demo submarine from the Swedish navy [53].…”

Section: Case Studiesmentioning

confidence: 99%

“…In the case of SMG, the experimental reference consists of both an experimental fullscale campaign (EXP FS) and a model scale simulation from an extensive captive model testing campaign (CMT MS). The SWE reference results come from mixed techniques [53] while the DARPA Suboff belongs to two different simulated datasets, revealing a huge dispersion due to the highly unstable design of this vessel [51,52]. Indeed, small variations in the stability index near to zero led to the relevant spread of the results.…”

Section: Free-running Tests-validationmentioning

confidence: 99%

See 1 more Smart Citation

Submarine Manoeuvrability Design: Traditional Cross-Plane vs. x-Plane Configurations in Intact and Degraded Conditions

Piaggio

Vernengo

Ferrando

et al. 2022

JMSE

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Submarines’ manoeuvrability both in intact and degraded operating conditions is the main design concern starting at the very early stages of design. This increased complexity of the design process compared to a surface vehicle can only be handled by using dynamics numerical simulations on both the vertical and horizontal manoeuvring planes. To this aim, a 6-DoF method is presented, validated, and applied to study the manoeuvring characteristics of several vessels. The analysis has been conducted considering two standpoints, i.e., to verify the design handling capabilities of the vehicles at low and high speeds and to study the off-design residual abilities in the eventual case of emergency operations with jammed/lost-control surfaces. The influence of different design features, such as, e.g., the stern plane “+” and “x” configurations, fairway size and positioning, hull dimensional ratios and restoring capabilities have been analysed in terms of impact on turning ability, course and depth changing abilities, and vertical/horizontal course stability, including the vertical damping ratio and critical velocity.

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Section: Case Studiesmentioning

confidence: 99%

Section: Free-running Tests-validationmentioning

confidence: 99%

Submarine Manoeuvrability Design: Traditional Cross-Plane vs. x-Plane Configurations in Intact and Degraded Conditions

Piaggio

Vernengo

Ferrando

et al. 2022

JMSE

View full text Add to dashboard Cite

show abstract

“…Specifically, the surface of the towing ship in Domain II and the surface of the towed vehicle in Domain III were defined as a non-slip wall. The outer surfaces of Domain II and Domain III were defined as the overset mesh boundaries [19,20]. There were two mesh schemes used in this paper: one was the trimmed method, the other was the polyhedral mesh method.…”

Section: Computational Domainsmentioning

confidence: 99%

Numerical Simulation of Depth Tracking Control of an Underwater Towed System Coupled with Wave–Ship Interference

Yang

et al. 2021

JMSE

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This paper presents a numerical study of the depth tracking control for an underwater towed system under wave–ship interference condition. To overcome the laminations of ignoring the hydrodynamic factors and wave–ship interference in the existing simulation model for the depth tracking operation of the underwater towed system, a numerical model combining the control system with the computational fluid dynamics (CFD) method based on the overset mesh technique is explored and constructed; the influence of towing ship and head waves is introduced into the numerical analysis of the underwater towed system; a depth control system based on the center of gravity adjustment is proposed and its control characteristics are discussed. The fluid motion around the towed vehicle and the towing ship is governed by the Navier–Stokes equations, and the overset mesh technique is applied for the numerical solution of the equations. The towing cable connecting the towed vehicle and towing ship is governed by the quasi-steady-state catenary equations. The depth tracking controller adjusting the longitudinal position of a shifting weight is constructed based on the proportional–integral–derivative (PID) algorithm. The simulation results show that the numerical simulation system is practicable, and the depth tracking control system is feasible, effective, and robust.

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“…Submarines are usually highly covert and difcult to detect. In the process of submarine movement, the interaction between the submarine and the surrounding water medium will form the wake vortex [3,4]. Tese wake-vortices can be maintained for a long time in the water, and the steering state of the submarine can be retrieved through the wake -vortices [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

An Improved Wake Vortex‐Based Inversion Method for Submarine Maneuvering State

Kong

Yang

Cai

et al. 2023

Computational Intelligence and Neuroscience

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As the noise reduction performance of submarines continues to improve, it is difficult to detect and track submarines through acoustic detection techniques. Therefore, nonacoustic submarine detection techniques are becoming more and more important. The submarine movement will leave a wake vortex, and the information of the wake vortex can be used to invert the maneuvering state of the submarine. However, the wake vortex is constantly dissipated in the evolution process, and the strength of the wake vortex is constantly reduced, resulting in the gradual weakening of the characteristics of the wake vortex, which makes the inversion of submarine operating state difficult and less accurate. In order to solve the above problems, this paper proposes an improved wake vortex-based inversion method for submarine maneuvering state. Firstly, a random finite set of submarine wake vortex observation features is established to obtain the feature with the highest correlation degree with submarine maneuvering state in the random finite set. Secondly, the multiscale fusion module and attention mechanism are used to re-encode the weak features of the wake vortex image, and the salient features of the wake vortex image are extracted. Finally, the manipulation state of the wake vortex image is retrieved by the extracted salient features. The experimental results show that the average inversion accuracy of the proposed algorithm is improved by 1.27% in terms of manipulating state inversion of weak feature wake vortex images. The algorithm in this paper can realize the inversion of submarine maneuvering state in the case of weak submarine wake vortex image features and incomplete feature information. It provides the basis for the detection technology based on the submarine wake characteristics.

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An initial evaluation of the free surface effect on the maneuverability of underwater vehicles

Cited by 26 publications

References 17 publications

Submarine Manoeuvrability Design: Traditional Cross-Plane vs. x-Plane Configurations in Intact and Degraded Conditions

Submarine Manoeuvrability Design: Traditional Cross-Plane vs. x-Plane Configurations in Intact and Degraded Conditions

Numerical Simulation of Depth Tracking Control of an Underwater Towed System Coupled with Wave–Ship Interference

An Improved Wake Vortex‐Based Inversion Method for Submarine Maneuvering State

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