Correlations between noise level and mechanical vibrations emitted by viboracoustic sources

Economic development brings environmental concerns in general and in particular regarding the
protection against the aggression of external factors on humans, among which noise and
vibration. Noise is usually defined as a sound or the amount of unwanted sounds, a by-product
of daily activity. Environment vibrations that human body is exposed to may have different causes:
construction machinery, heavy equipment and electric hand tools. Whole human body vibrations
usually occur during transport, but can be found in other places in the course of industrial
processes. Regardless of industrial activity that cause them, vibrations acts on the human body
and this can cause discomfort to the operator. Wear of the components of industrial devices
influences both noise and mechanical vibration levels. The paper presents correlations occurring
between noise and mechanical vibrations emitted by the engine of a car depending on the number
of engine revs. For a broader characterization of emission, acoustic power and directivity factor
are calculated.