Noise and Vibration Suppression System
What is it?
The Q Series is equipped with the revolutionary new system called NVS that reduces sound and vibration at their sources - even vibrations below the audible threshold. The system works effectively by reducing the vibrations in the fuselage, thus stopping much of the noise from entering the cabin to begin with. The benefit is most dramatic in the seats closest to the arc of the propellers, but is also very noticeable throughout the cabin.
NVS is unique to the Q Series and is the world's first application of this technology in an airliner cabin.
How does it work?
The majority of noise and vibration in a turboprop cabin is caused by the 'pulses' of air that hit the side of the aircraft fuselage, created by the turning of the propeller. This in turn causes the fuselage to vibrate, and transmit both noise and vibration into the cabin.
The NVS system reduces this fuselage vibration through leading edge active control technology.
The diagram below illustrates the peaks of energy created by the air pulses, and the reduction in these peaks through the use of the active control technology.
Harmonic Components of Cabin Noise
During flight, microphones concealed throughout the cabin transmit noise information to a special on-board computer that also receives the propeller speed. The computer continually analyzes this information and signals devices called Active Tuned Vibration Absorbers (ATVAs) mounted on the fuselage frames. The ATVAs then produce out-of-phase counter vibrations, so that the original vibrations are significantly reduced.
The NVS technology, exclusive to the Q Series, is designed and built by Ultra ELECTRONICS.