WUPPERTAL, Germany, Jan. 11 /CNW/ - 'Creating Silence' - Acoustics
specialists at HAPPICH Division, Pelzer Acoustic Products, have again
put their motto into practice, developing the new "double-sided
sound-absorbing engine cover". They have thus cut noise emissions in
the engine compartment by 4 decibels compared with standard engine
covers, and simultaneously halved the weight. The prototype of this
completely new method is already being used successfully by Volvo Penta
Diesel for ships' engines.
Did you know that standard engine covers offer barely any noise
reduction? Their main aim is to improve the appearance of the engine
compartment. Look under the bonnet and the first thing you see is an
immaculate plastic cover with an appealing manufacturer's logo.
However, almost nobody knows that these attractive engine covers are
made of a so-called "reverberant" material. Despite the insulation
underneath, an annoying residual noise remains that is not absorbed.
Absorbent partial casing concept
However, instead of "locking in" the noise emissions in this kind of
reverberant plastic cover and thus even increasing them, it is more
effective to absorb the sound directly at and outside the engine, in
the engine compartment. With this partial casing concept, it is not
even necessary to fully cover the engine: Partial cladding is enough to
reduce noise levels.
And, because vibration isolators and rubber seals are redundant, the
weight is also reduced by around 2 kilos.
The solution: Versapanel
This highly effective method of sound absorption is achieved with a
special material, Versapanel, which is used as a flexible engine cover.
Its surface is made of aluminium foil, microperforated on both sides,
and it contains a highly absorbent filling. Lightweight and flexible,
it can be easily adjusted for even complicated engine compartments. It
also provides mechanical protection and is highly heat and
SOURCE HAPPICH GmbH
For further information:
Alan Franks, IEng, MIIE, MIOA, Managing Director, Happich UK Ltd, Tel: +44(0)7532-097007, Email: firstname.lastname@example.org, http://www.happich-uk.co.uk