Turbulent Boundary Layer (TBL) induced noise is one of the dominant noise sources in modern aircraft, where classical materials are progressively being substituted by fiber-reinforced polymers. Although passive methods continue to be developed due to their straight realization in practical flight applications, they add additional weight and are also accompanied by some degradation in high-lift ...

ADAPTIVE RESONANT MODE ACTIVE NOISE CONTROL Adam K. Smith, MS University of Pittsburgh, 2005 Low frequency sound waves propagating in a duct is ideally suited for active noise control (ANC) applications. Unlike passive treatments, ANC utilizes an acoustic actuator (loudspeaker) to cancel unwanted sound fields. There are two main control topologies when considering the active suppression of soun...

This paper examines the application of passive vibration control methods to a simplified satellite boom. It is suggested that such methods may allow an efficient means by which to control structural vibrations. In this research, an initial structure is designed having a regular, repeating geometric pattern. This design is then modified using a Genetic Algorithm (GA), which is one of a number of...

To circumvent issue of Rayleigh noise reduction in wavelength-divisionmultiplexed passive optical network (WDM-PON), we provide an insight into the source of Rayleigh noise, and confirm that the suppression of carrier Rayleigh backscattering (RB) should be the primary target in the design of Rayleigh noise-resilient upstream receiver module. This paper studies an alternative network architectur...