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Full-Text Articles in Mechanical Engineering
Aeroacoustic Analyses For Noise Reduction Application, Mahmoud M. Abdalmola
Aeroacoustic Analyses For Noise Reduction Application, Mahmoud M. Abdalmola
Mechanical Engineering Theses
In this study, we examine the hypothesis that airflow noise can be reduced by adding metamaterials. The introduction of any obstacle will generate more disturbance in the airflow and therefore add noise. Hence an efficient metamaterial design is required, capable of reducing noise even at higher flow disturbance. In order to examine this hypothesis, we developed a platform to perform isogeometric aeroacoustic analyses to solve Navier stokes equations first. We obtained the velocity fields from fluid-structure analyses and utilized the light-hill analogy to calculate the noise generated as a result of airflow. Then the Helmholtz equation was solved to perform …
Acoustic Design Optimization With Isogeometric Analysis And Differential Evolution, Garrett W. Dodgen
Acoustic Design Optimization With Isogeometric Analysis And Differential Evolution, Garrett W. Dodgen
Mechanical Engineering Theses
The objective of this study is to utilize shape optimization to enhance the performance of devices relying on acoustic wave propagation. Particularly, the shape of a horn speaker and an acoustic energy harvester were optimized to enhance their performance at targeted frequencies. High order Isogeometric Analysis (IGA) was performed to estimate the acoustic pressure with minimum geometry and pollution errors [1]. The analysis platform was then combined with Differential Evolution (DE) to optimize the geometry of the horn speaker and energy harvester at a given frequency. These cases effectively demonstrate two applications of Isogeomtric shape optimization for devices relying on …