|
The aim of fundamental studies into the active control of aircraft interior noise is to gain further understanding of the physical mechanisms and phenomenon responsible for achieving effective and realisable noise reductions in fuselage structures, with particular recent focus on Active Structural Acoustic Control. Both analytical and experimental models of a longitudinally stiffened cylinder with floor structure have been developed to investigate the interior noise reductions due to the application of multiple vibration control sources. In addition, a capacity to analytically model both longitudinal and circumferential stiffening on the structure enables the effects of different stiffener configurations on the use of vibration control sources for minimising interior noise levels to be explored. Also, an effective method for finding the optimum locations for vibration control sources has been developed using a genetic algorithm search methodology, which uses the present model as the basis for investigating its effectiveness. The stiffened cylinder with floor model represents a reasonable compromise in the level of model complexity (compared to that of realistic fuselage structures), but not so much as to hinder the analysis of underlying mechanisms responsible for active structural acoustic control, particularly when actuator positions have been optimised using a genetic algorithm search method.
|
|
