A review of articles on reducing engine noise and the causes of turbocharger noise

Today, due to the increasing weight of cars, the addition of turbochargers to internal combustion engines increases performance and at the same time, produces high noise in the range of 72 dB to 154 dB when the engine is running at high speeds and during the initial acceleration. To reduce the negative effects of these noises and increase the comfort of the car occupants, various methods such as including finite element analysis and numerical analysis of compressor blades to optimize pressure drop coefficients (ratio of turbine input to compressor output), sound pads and acoustic materials around engine parts including turbocharger parts and air manifold, are used. The purpose of this article is to express and classify the research done in the field of reducing annoying noises resulting from the operation of the car engine and turbocharger.