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Shape Optimization of Engine Block for Reducing Noise Radiation
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
Reducing the noise radiated from engines has become important. Optimizing the shape of the engine block is one promising approach to achieve this goal. The objective of this paper is to perform the shape optimization of an engine block to reduce its radiated noise in a certain frequency range. Specifically investigated is a six-cylinder engine made of aluminum and steel. The investigation is performed by numerical models, which compose the finite elements for simulating the structure and boundary elements for simulating the exterior airspace. For optimization, a series of ribs are added on the surface of the engine block. The optimization variables are set up to represent the shapes of the ribs. The limits of the shape changes are defined by the optimization constraints. The radiated power and the sound pressure at certain locations are chosen as the optimization objectives. The Genetical Algorithm is taken to perform the optimization. It is found that the optimization calculation successfully converges and gives the best design. The radiated noise is reduced by certain amount. A Pareto plot with two objective functions, one being the sound radiation and another one being the mass of the engine block, can also be obtained for engineering reference.