Helmet Integrated Systems & QinetiQ.*
Active Noise Reduction, Sea King Trials - The Real Story
Simon Smith & Mark Hancock*
The UK MoD sponsored a development programme to investigate the
use of Active Noise Reduction in Military Aircraft. QinetiQ, Helmet
Integrated Systems Limited and Acoustics Management and
Communication Consultants (AMCC) undertook to design, develop,
manufacture and test an analogue based Active Noise Reduction
System.
Development and manufacturing issues arose which impacted design
constraints, but finally yielded a qualified system, which was
taken to trial at RNAS Culdrose in the Sea King AEW2.
In terms of introducing ANR into service, a major component of the programme has been the conducting of noise surveys where the aircraft noise environment and aircrew at-ear noise levels were investigated.
The use of ANR presents advantages over the standard flight helmet including the improved detection of speech and non-speech signals, a reduction in fatigue and stress levels and improved speech intelligibility.
Trials have continued in the Sea Kings HC4, HU5 and HAS6 and now the Sea Harrier FA2 and T8.
This paper seeks to discuss the development and manufacturing issues that arose and present findings of the trials conducted and review the effectiveness of ANR 'in-service.
To download the full paper CLICK HERE (.PDF)
