Minimising Turbocharger Whoosh Noise for Diesel Powertrains 2005-01-2485
Diesel vehicle buyers in Europe are now able to select from a wide range of desirable products with excellent performance and levels of refinement competitive with gasoline engine products. However, the trend towards higher ratings and increased low speed torque appears to have resulted in increased levels of turbocharger generated flow or ‘whoosh’ noise.
This paper discusses the phenomenon of turbocharger whoosh and its impact on powertrain  and vehicle level NVH  focusing on:
Possible mechanisms for whoosh noise occurrence
The effect of turbocharger compressor selection on whoosh noise
Mechanisms for the radiation of whoosh noise
Potential countermeasures for reducing turbocharger whoosh
Case studies are drawn from a range of relevant powertrain NVH projects to illustrate the turbocharger whoosh noise development process.
The paper includes an insight to the future development of predictive tools for the whoosh noise phenomenon.