Considering the number of applications, and the quantity of research conducted over the
past few decades, it would not be an overstatement to label the piezoelectric materials as …

Although helicopter has become a versatile mode of aerial transportation, high vibration
levels leads to poor ride quality for its passengers and aircrew. Undesired vibration …

HELICOPTERS generate significant vibration and noise, which deteriorates their operational
economics and performance. The main sources of vibration are the rotor hub reactions of the …

A HELICOPTER rotor blade is exposed to a large variation in flow environment in one
revolution (transonic flow on the advancing side to near-stall/stall on the retreating side). The …

A conventional rotor control system restricted at 1/rev frequency component is unable to vary
the hub vibratory loads and the aeroacoustic noise, which exist in high frequency …

The current status of Canadian research on rotor-based actively controlled technologies for
helicopters is reviewed in this paper. First, worldwide research in this field is overviewed to …

Disclosed herein are control systems relating generally to the field of aerodynamics and
more particularly to the control of vibration of rotor blades such as helicopter blades. Such …

The realization of semi-active actuators by smart structures is discussed. Semi-active
actuators have the advantage of consuming much less power than direct-active actuators …

In the present work, a novel hybrid Euler-compressible vortex particle method is developed
for 2-D transonic rotorcraft applications. It is identified that the advantages and …

This paper presents the work performed at ONERA in the framework of the WorkPackage 5
of the Friendcopter European project. The objectives of this study consist in the research of …