Recent advances in active noise and vibration control
Invited paper
Fraunhofer LBF
Wednesday 3 june, 2015, 10:00 - 10:20
0.7 Lisbon (47)
Abstract:
Noise is a serious form of environmental pollution believed to affect the
lives of some 100 million European citizens. The cost of the associated damage
is estimated at more than ten billion euros per year. Noise leads to serious
health problems, limits the capability to learn, and effects the occupants’
comfort and performance in buildings, in vehicles or at work. For instance,
the automotive industry is more and more facing the problem of reducing the
weight of the vehicle but guaranteeing an equivalent level of comfort in terms
of noise, vibration, and harshness (NVH). Improvement of vehicle noise and
vibration without affecting other performances is proving to be extremely
difficult if not impossible with state-of-the-art technology. Thus, active or
smart concepts are being increasingly considered for the NVH optimization of
vehicles besides advanced passive material systems.
Within the LOEWE-Zentrum AdRIA (Adaptronics – Research, Innovation,
Application), a large interdisciplinary research project funded by the German
federal state Hessen, and at the Fraunhofer LBF advanced noise and vibration
abatement concepts are being developed and demonstrated. Among others, NVH
abatement in vehicles and noise abatement in buildings is being considered. As
underlying principle for noise reduction concepts, active structural acoustic
control (ASAC) is primarily being considered for controlling the structural
vibration of the sound radiating structure or by controlling the structure
borne sound path.
This paper will present the most recent concepts and results of the LOEWE-
Zentrum AdRIA such as active vibration control at engine mounts and smart
windows. Examples presented will include adaptive vibration neutralizers,
active mounts connecting the active element in parallel, shunt technologies
with piezoelectric ceramics or smart Helmholtz resonators.