Designing
& Manufacturing Anechoic Chambers for over 50 years |
Bosch Article
RESEARCH AND DEVELOPMENT
CONSTRUCTION COMPLETED ON HEMI-ANECHOIC CHAMBER
We have just completed construction of a hemi-anechoic chamber, which
will be used for testing our new VPV Whisper Pumps, as well as small power
units and other BOSCH products. The sound chamber will allow us to measure
and improve the noisy characteristics of our products not only for sound
levels, but also for sound quality, by incorporating design modifications
before the final product is released. In addition we can accurately compare
our products against our competitors in a controlled environment with
very low ambient noise.
The inside dimensions of the chamber are 4.2m x 3.9m x 3.5m (14' x 13'
x 11.5') wedge tip to wedge tip, and although it was designed with 100Hz
cut-off frequency, a qualification test by ECKEL indicated that the chamber
has 63Hz cut-off frequency. The chamber is constructed with metal perforated
wedges filled with fibrous material for better performance. The chamber
is built on an isolated concrete slab, in order to isolate any vibrations
transmitted from the surroundings. A climate control unit provides a controlled
interior room environment with a constant temperature and relative humidity
level. An observation system with a color monitor and a two way intercom
system provides a remote communication between the operator inside the
room and the person acquiring the data outside. In addition the observation/intercom
system provides remote monitoring during the test. Provisions were made
for easy removal of the pump test bed and support in order to accommodate
even the large power units.
A multi channel data acquisition FFT analyzer (ZONIC PC7000) is used
for performing noise and vibration measurements and analysis.
The chamber was built by ECKEL, a company which specializes in building
anechoic chambers. The chamber utilizes the latest technology in anechoic
chamber construction and provides the a state of the art facility for
noise and vibration testing and evaluation. The development of this chamber
illustrates our desire to provide our customers with only the highest
quality products. For more information about our new whisper Pump product
line, you may refer to our vain pump catalog number 9 535 233 724.
Chamber currently being relocated from USA to Germany
Eckel make it possible
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