Frequency Response Function of a Submarine Hull

Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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GERMANCONF01_229

تاریخ نمایه سازی: 26 مرداد 1397

Abstract:

In this research, simplified physical model of the submarine hull has been considered as acylindrical shell containing ring stiffeners. It identification is done in low frequency,so, the goal is to determine frequency response function is in frequencies of low than100 hz. For determination of it, mass matrix, stiffness matrix and damping matrix ofmodel should be extracted. The structure is modeled in ansys11 software, and ismeshed with triangular element. Displacement domain of each node is considered inradial and axial direction, number of structural elements and coordinates of nodes aretheoretically analyzed by matlab software based on finite element rotating shell.Three matrixes above are extracted, then the natural frequency is obtained and thendiagram of function is drawn in the low frequency range. The achievements of usingthis method are determination of response of propeller−shafting system of hull,coupling propeller−shafting system to hull, the optimization of resonance changer inlow frequencies due to reduction of transmission noise of propeller to submarine hullwith technique of genetic algorithm, description of the acoustic signature ofsubmarine due to submarine propeller excitation which is being investigated by thedepartment of mechanics and this method can be considered as one of the maritimetechnologies and implemented as plan applicable in marine industries.

Authors

Hadi Khalilnezhad

Department of Mechanical Engineering, Imam Khomeini Naval University of Noshahr, Noshahr, Iran

Mohammadreza Ashoori

Modal Analysis Laboratory, Department of Mechanical Engineering, University of Semnan, Semnan, Iran

Ehsan Jamshidi

Department of Mechanical Engineering, Islamic Azad University, Semnan Branch, Semnan, Iran

Abbas Zarenezhad

Department of Mechanical Engineering, Imam Khomeini Naval University of Noshahr, Noshahr, Iran