This thesis presents a method for the determination of fan casing noise radiation. Boundary element program is developed to calculate the acoustic pressure on the surfaceof fan casing in terms of its surface vibration...This thesis presents a method for the determination of fan casing noise radiation. Boundary element program is developed to calculate the acoustic pressure on the surfaceof fan casing in terms of its surface vibration which measured experimentally. The SurfaceHelmholtz integral Equation discretized by isoparametric element was selected as the concrete calculation method. The acoustic fields resulting from differellt aeroacoustic sourcescan be differentiated by using the method which provides a theoretical principle for fan noisedecrease techniques.展开更多
文摘This thesis presents a method for the determination of fan casing noise radiation. Boundary element program is developed to calculate the acoustic pressure on the surfaceof fan casing in terms of its surface vibration which measured experimentally. The SurfaceHelmholtz integral Equation discretized by isoparametric element was selected as the concrete calculation method. The acoustic fields resulting from differellt aeroacoustic sourcescan be differentiated by using the method which provides a theoretical principle for fan noisedecrease techniques.
