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Parametric Design And Optimization Of A Pivoting S-Type Rudder For Containerships, Chen-Wei Chen, Tsung-Yueh Lin, Bo-Yen Chen, Jen-Shiang Kouh
Parametric Design And Optimization Of A Pivoting S-Type Rudder For Containerships, Chen-Wei Chen, Tsung-Yueh Lin, Bo-Yen Chen, Jen-Shiang Kouh
Journal of Marine Science and Technology
This study proposes an energy-saving S-type rudder design to deal with the inhomogeneous inflow from a rotating propeller behind a containership. The S-type rudder was modelled parametrically using four-digit NACA foils as section profiles together with Non-uniform rational B-splines (NURBS) surface formulations. A three-stage optimization process is proposed to reduce the number of design iterations necessary to achieve an optimal design. The propulsion simulations were done via CFD software, which solves the hydrodynamics of viscous flow, as governed by the Reynold-averaged Navier-Stokes (RANS) equations. Validations were performed with experimental model tests, including hull resistance, propeller open-water performance, and propulsion in …
Shape Optimization Of Rectangular Multi-Chamber Mufflers At High-Order-Modes, Ying-Chun Chang, Min-Chie Chiu
Shape Optimization Of Rectangular Multi-Chamber Mufflers At High-Order-Modes, Ying-Chun Chang, Min-Chie Chiu
Journal of Marine Science and Technology
Muffler design as of late has been restricted to lower frequencies using the plane wave theory. This has led to an underestimation of acoustical performances at higher frequencies. To overcome the above shortcomings, an analysis of three-dimensional waves propagating for a simple muffler using the finite element method has been developed. However, there has been scant research on rectangular mufflers equipped with baffle plates that eliminate noise, nor has the space-constrained conditions of industrial muffler designs been properly addressed. Therefore, to improve the acoustical performance of a rectangular muffler within a constrained space, the shape optimization of rectangular mufflers using …