sound level meters are used to measure the sound pressure emitted at key
positions around the machinery and spectrum analysis of the sound pressure
signals is carried out using our Hewlett-Packard 35670A dynamic signal analyser.
All sources of noise have their characteristic frequencies and almost always
these are speed dependent, so analysing the emitted sound for its frequency
content allows our engineers to home in on and identify the source of the
is the case with vibration problems, the source of the vibration is not
always found to be abnormal and in these cases resonances of the machine
components or its guarding is usually found to be magnifying the noise and
emitting it like a "loudspeaker." Where appropriate, our investigations
include identification of structural and local resonances using modal analysis
techniques -see our modal analysis page for more details of this.
All our investigations are followed up with a detailed Technical Report
in which the results are described and, if appropriate, recommendations
for improvement are presented.
Recent projects have included: power station motor/pump sets, tablet
making machines, transfer lines for engine manufacturing, hoists and nuclear
fuel can manufacturing machines
Contact us if you think we may be able to help.
UNIVIB offers a rapid-response, on-site service for
the troubleshooting of all types of machinery noise problem. Our noise
consultants have over 30 years experience in the analysis and diagnosis
of all types of industrial noise. Investigations are carried out on site
using our portable analysis instrumentation.