Dittrich M.

Noise control of different types of outdoor machinery such as construction machines, generators and other equipment powered by internal combustion engines requires knowledge of the noise path model and the potential noise control measures. As there is often a trade-off between different design parameters and cost, it is of use to the designer to be able to study the effect of various combinations of noise control measures. The noise path model consists of the main sound sources, noise paths and radiators, described in terms of their spectral contribution to the total sound power or sound pressure level. It also can include the dependency on operating conditions (speed, load, power), and relevant design parameters such as enclosure parameters, intake and exhaust design, elastic mount stiffness, damping materials and others. It is illustrated how the EQUIP+ noise path modeller can be used to assist in this process. A component-based noise path model is shown with the main acoustic characteristics and influence parameters.