Aeromechanical Stability Augmentation Through Semi-Active Control

ISBN-13: 9783639175325 / Angielski / Miękka / 2009 / 180 str.

Sandeep Agarwal

Opis

Helicopter rotors have traditionally been equippedwith passive dampers for aeromechanical stability. These passive systems have fixed characteristics, andadd to mechanical complexity and high maintenancecost. Furthermore, they are unable to change tocompensate for an unexpected loading trends astypically encountered by a rotary wing vehicle. Semi-active control strategies are dissipative innature, inherently stable, and require a littleenergy to operate. Hence, they appear to beparticularly promising in addressing anumber of the challenges facing active controlstrategies, in that the devices are low power,fail-safe, and reliable. In this study, authorinvestigates friction based semi-active approach forground resonance stability augmentation and proposesnovel strategies for the adaptive, selective andindividual damping control. The effectiveness ofthese control strategies is validated on acomprehensive multibody system model of an armyhelicopter. The analytical study is supplemented witha novel design of a semi-active lead lag damper andvarious aspects of its design in application tocommercial rotors are discussed.

O autorze

Dr. Sandeep Agarwal is a Rotor Dynamics Engineer at the Boeing
Company. Prior to that, he worked at the Center of
Excellence in Rotorcraft Technology at Georgia Institute of
Technology. His primary interests include Rotor dynamics,
Aeroelasticity, Structural Morphing and Structural
Optimization. He has authored several technical publications.