Stochastically excited structures in an infinite fluid domain
Numerical representation of the vibroacoustic behaviour of marine propellers under turbulent excitation
K.T.A. van Gijn (TU Delft - Aerospace Engineering)
AH van Zuijlen – Mentor (TU Delft - Aerodynamics)
Gonçalo Peixoto Dourado – Mentor (TNO)
D Fiscaletti – Graduation committee member (TU Delft - Ship Hydromechanics)
Marten Nijhof – Graduation committee member (TNO)
Roel Müller – Graduation committee member (TNO)
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Abstract
Sound is vital for marine animals to navigate and find prey, but underwater noise from ships negatively affects them. This study aims to develop a predictive method for non-cavitating propeller radiated noise. The interaction between the turbulence and propeller blade is important for this method.
COMSOL Multiphysics is a software package used for verification. The complexity of the loads that can be used in COMSOL Multiphysics is limited and is not suitable for a turbulent flow load. Simple load cases were used as verification.
Various methods are employed to obtain a response power spectral density (PSD) identical to COMSOL Multiphysics. The KM-method matched the COMSOL response PSD well, while the A-matrix method faced challenges. The state-space reconstruction method showed some similarity while using a proportionally-damped response function, but did not fully match the COMSOL response PSD.