Abstract
The main acoustic characteristic of noise muffler–"brought losses", which shows the decrease of noise created by its source, in particular by exhaust system of internal-combustion engine, in a control point as a result of muffler use is considered. The explanation of essence of this characteristic and its mathematical description are offered; the empirical dependences for calculation of sound radiation impedance by exhaust system end opening are given. The offered way of release noise source impedance definition seems to be more reliable in comparison with already known ones as it allows to consider oscillatory processes in the exhaust manifold of internal-combustion engine thanks to which the calculation accuracy of muffler’s brought losses in course of its development at motor transport engines design stage is increased. The analytical dependences for calculation of frequencies at which the extreme values of this characteristic are observed are also received.
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