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.