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Jet noise remains a significant noise component in modern aero-engines. A high-speed flow mixing with the surrounding air constitutes noise sources behind the nozzle. This book consists of two parts. The first part is to provide an overview of the aircraft noise generating sources with emphasis on the jet noise, the main technologies employed for control and reduction of aircraft noise for subsonic and supersonic jets, and finally a survey of the current applications of large-eddy simulation (LES) for predicting of the noise from single stream turbulent jets, including numerical methods for...

Vibrations of turbo-machinery blades are critical to jet engine durability and performance. Active vibration control using piezoelectric sensors and actuators have recently been emerged as a practical and promising technology. This book deals with a new vibration damping technique for an unmanned aerial vehicle (UAV) propeller utilizing piezoelectric transducers (sensors and actuators). The damping performance depends on the type and location of the piezoelectric transducers with respect to the mode shape of the blade mechanical strain. Numerical simulations and experimental investigations...