Correlation of transmission loss of simple representative sidewall to full scale fuselage demonstrator
* Präsentierender Autor
Zusammenfassung:Recent developments in advanced material technology such as acoustic metamaterials seem to have potential to replace the traditional glass wool technology for thermal and acoustic insulation in aerospace vehicles. However, due to inherent challenges to derive material properties of metamaterials, small scale measurements to predict vibroacoustic response of material sample are favorable and cost effective. This paper discusses such small scale vibroacoustic measurements to predict transmission loss using p-u probe. A test bench to represent the double wall cavity as seen in a typical aircraft is developed and sound transmission tests are performed using p-u probe inhouse and a p-p probe at acoustic lab of Hamburg University of Applied Sciences. A measurement methodology is being developed to first corelate p-u measurement in alpha chamber and p-p measurement in a full-scale test facility. Subsequently, the goal of this work is to develop correlation between simple transmission loss (or insertion loss) test using p-u probe to full scale A320 fuselage located in acoustic flight lab of ZAL. Furthermore, numerical simulation using finite element method in Actran will be performed to complement the efforts to develop the correlation methodology between small scale and large-scale measurements.