Computational vibro-acoustic modeling for aircraft fuselage design optimization

点击翻译按钮获取中文摘要

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 designand manufacturing methods. The focus of this project is on ways to reduce the acoustic noise transmittedthrough the fuselage from the exterior to the interior of the aircraft while minimizing the addition of acousticbarrier material and eliminating costly and environmentally unfriendly manufacturing methods.The proposed project has two main objectives. The first objective is to develop and experimentally verifyaccurate computational (FEM and BEM) vibro-acoustic models of various aircraft fuselage designs. Thesemodels 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 optimumfuselage designs. This objective has two principal tasks. The first task is to find the design that provides thehighest acoustic noise attenuation with the lowest weight per unit area. The second task will be to evaluatealternative manufacturing methods that could be used with the optimum fuselage design to reduce overallcombined costs (including fuel consumption (due to net weight), manufacturing costs (due to materials usedand fabrication time), and inspection costs (to meet regulatory requirements). The multi-parameter optimizationwill likely require revisiting the original "optimal" design (for reduced noise) and making modifications thatwill affect factors related to manufacturing and operating costs. The computational model that predictsvibro-acoustic noise transmission will allow this iterative process to be completed without the need forprototype testing until the final stage, therefore saving considerable time and money.