Rotational speed measurement meter for motor, has analyzer to determine rotational speed based on periodicity of specific characteristic signal related to sound wave, output by sound transducer
DE10007549A1
Silencing line for engine exhaust system, consisting of at least one layer of sound absorbing material
AU5286699A
Device and method for reducing the noise emissions of internal combustion engines and for diagnosing the same
AU5163299A
Device and method for actively reducing the noise emissions of jet engines and for diagnosing the same
DE19843615A1
Device and method for diagnosing combustion engines