Computational vibro-acoustic modeling for aircraft fuselage design optimization

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In order to remain commercially competitive and limit the environmental impact of their activities**(manufacturing and use of aircraft), Bombardier Aerospace continually searches for optimum aircraft design**and manufacturing methods. The focus of this project is on ways to reduce the acoustic noise transmitted**through the fuselage from the exterior to the interior of the aircraft while minimizing the addition of acoustic**barrier material and eliminating costly and environmentally unfriendly manufacturing methods.**The proposed project has two main objectives. The first objective is to develop and experimentally verify**accurate computational (FEM and BEM) vibro-acoustic models of various aircraft fuselage designs. These**models will then allow Bombardier to predict the acoustic transmission loss (acoustic noise attenuation)**through different aircraft fuselage designs without the need for expensive iterative experimental measurements.**The second objective is to use the newly developed computational modeling tool to search for optimum**fuselage designs. This objective has two principal tasks. The first task is to find the design that provides the**highest acoustic noise attenuation with the lowest weight per unit area. The second task will be to evaluate**alternative manufacturing methods that could be used with the optimum fuselage design to reduce overall**combined costs (including fuel consumption (due to net weight), manufacturing costs (due to materials used**and fabrication time), and inspection costs (to meet regulatory requirements). The multi-parameter optimization**will likely require revisiting the original "optimal" design (for reduced noise) and making modifications that**will affect factors related to manufacturing and operating costs. The computational model that predicts**vibro-acoustic noise transmission will allow this iterative process to be completed without the need for**prototype testing until the final stage, therefore saving considerable time and money.