Submarine structural and acoustic attenuation

Gangemi, Peter J.; Kanapathipillai, Sangarapillai

doi:10.1177/1077546314562240

Cited by 4 publications

(4 citation statements)

References 21 publications

(32 reference statements)

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“…However, in that paper, the wave propagation in the system and the equations of motion of the plate were studied and described within the scope of the Kirchhoff plate theory. Moreover, hydro -elastic systems which are similar to those considered in the present paper were the subject of papers by Gangemi and Kanapathipillai (2014), Kang (2014) and others listed therein.…”

Section: Introductionmentioning

confidence: 77%

The forced vibration of the system consisting of an elastic plate, compressible viscous fluid and rigid wall

Akbarov

Ismailov

2015

Journal of Vibration and Control

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The forced vibration of the system consisting of a pre-stressed elastic plate, barotropic compressible Newtonian viscous fluid and rigid wall is considered. The space between the plate and rigid wall is filled by the fluid. It is assumed that the forced vibration is caused by the lineally-located time-harmonic force acting on the free face plane of the plate. The motion of the plate is written by utilizing the exact equations of elastodynamics, but the motion of the compressible viscous fluid is described by the linearized Navier-Stokes equations. Moreover, it is assumed that the velocities and stresses of the constituents are continuous on the contact plane between the plate and fluid, and that the impermeability conditions on the rigid wall are satisfied. The dimensionless parameters which characterize the compressibility and viscosity of the fluid as well as the elasticity constants of the plate are introduced. Plane strain state in the plate and two-dimensional plane flow of the fluid are considered. Numerical results on the interface normal stress and velocities are presented. The influence of the problem parameters is also discussed, including the fluid viscosity and compressibility, thickness of the plate and fluid depth as well as the excitation frequency. In this discussion the focus is on the influence of the fluid depth on the studied quantities. This is the parameter through which the main difference arises between the present and previous works by the authors.

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Section: Introductionmentioning

confidence: 77%

The forced vibration of the system consisting of an elastic plate, compressible viscous fluid and rigid wall

Akbarov

Ismailov

2015

Journal of Vibration and Control

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“…The unsteady external excitation force of the propeller during operation and the friction force of the shafting and bearing caused by the propeller rotation are important excitation sources for the vibration of the shell structure. At present, scholars have paid attention to the exciting force of the propeller on the shell [29][30][31][32][33]. Hassan et al conducted an experimental test on the hydrodynamic performance of a 5-blade high-skew propeller [16].…”

Section: Micro-motion Analysis Of Underwater Targetsmentioning

confidence: 99%

Micro-Doppler Effect and Sparse Representation Analysis of Underwater Targets

Lu,

Kou,

Wang

2023

Sensors

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At present, the micro-Doppler effects of underwater targets is a challenging new research problem. This paper studies the micro-Doppler effect of underwater targets, analyzes the moving characteristics of underwater micro-motion components, establishes echo models of harmonic vibration points and plane and rotating propellers, and reveals the complex modulation laws of the micro-Doppler effect. In addition, since an echo is a multi-component signal superposed by multiple modulated signals, this paper provides a sparse reconstruction method combined with time–frequency distributions and realizes signal separation and time–frequency analysis. A MicroDopplerlet time–frequency atomic dictionary, matching the complex modulated form of echoes, is designed, which effectively realizes the concise representation of echoes and a micro-Doppler effect analysis. Meanwhile, the needed micro-motion parameter information for underwater signal detection and recognition is extracted.

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“…Typical submerged systems are ships, submarines [ 48 , 49 ], and also living organisms [ 50 , 51 ]. It is well-known that the detection of the acoustic signature with remote sensors is a field of interest for military purposes [ 52 , 53 ] and also in the study of marine species [ 50 ] as it can give information of the type, state, and position of the considered system. In the military field the main interest focuses on the reduction of the emitted sound originated internally (acoustic signature) in ships and submarines and also in the reduction of the reflected sound ( Figure 5 ), with the purpose of making the system “acoustic” invisible to radars and detecting systems.…”

Section: Applications Of Pzt Patches In Submerged Systemsmentioning

confidence: 99%

A Review of PZT Patches Applications in Submerged Systems

Presas

Luo

Wang

et al. 2018

Sensors

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Submerged systems are found in many engineering, biological, and medicinal applications. For such systems, due to the particular environmental conditions and working medium, the research on the mechanical and structural properties at every scale (from macroscopic to nanoscopic), and the control of the system dynamics and induced effects become very difficult tasks. For such purposes in submerged systems, piezoelectric patches (PZTp), which are light, small and economic, have been proved to be a very good solution. PZTp have been recently used as sensors/actuators for applications such as modal analysis, active sound and vibration control, energy harvesting and atomic force microscopes in submerged systems. As a consequence, in these applications, newly developed transducers based on PZTp have become the most used ones, which has improved the state of the art and methods used in these fields. This review paper carefully analyzes and summarizes these applications particularized to submerged structures and shows the most relevant results and findings, which have been obtained thanks to the use of PZTp.

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Submarine structural and acoustic attenuation

Cited by 4 publications

References 21 publications

The forced vibration of the system consisting of an elastic plate, compressible viscous fluid and rigid wall

The forced vibration of the system consisting of an elastic plate, compressible viscous fluid and rigid wall

Micro-Doppler Effect and Sparse Representation Analysis of Underwater Targets

A Review of PZT Patches Applications in Submerged Systems

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