Modal Analysis Tools to Enhance FRF-Based Optimization of Vibro-Acoustic Countermeasures in a Turbo-Propeller Aircraft

摘要

This document presents a methodology developed for reducing the total weight of a noise reduction solution with a minimum impact on acoustic performances. This methodology is based on a procedure which identifies, from an optimized solution, the less contributive structural elements to cabin noise. By combining acoustical concepts such as Frequency Response Function (FRF), Modal Participation Factor (MPF) and Modal Acoustic Transfer Vector (MATV), in addition to optimization tools such as Nastran SOL 200, the proposed methodology leads to a significant reduction in weight of the solution with a limited impact on noise reduction values thus obtaining a more effective solution.