The New Intensity of Acoustic Radiation (IAR) Parameter in the Mechanical Emissions of Machinery

摘要

The noise and vibration provoked by machinery in mechanical industries could be studied and controlled by means of different survey methods which could be utilised to determine the amount and origin of vibrations and noise. However, these methods often do not properly consider the relation between vibration and noise generation. The sound intensity techniques consider only sound generation, whilst the acoustic radiation analyses only sound origins but do not relate these noises with mechanical vibrations.The new IAR (Intensity of Acoustic Radiation) parameter, on the other hand, is able to determine the relation between vibrations and sound emission. In these lecture the new IAR parameter is defined and experimentally measured in several mechanical cases, from transportation vehicles utilised in manufacturing industries, to complex compressors utilised in fuel distributions. The IAR parameter is compared with other conventional techniques, as sound power measurements and modal analysis, and finally the most relevant results are analysed and comments.