Introduction to Turbocharging -- Induced Noise Types -- Acoustic Propagation Theory -- Analyzing Root Causes of Noise -- Computational Nonlinear Rotordynamics of Turbochargers -- Subsynchronous Constant Tone -- Eigenfrequency Modifications to Reduce Constant Tone Level
Summary
Aero and Vibroacoustics of Automotive Turbochargers is a topic involving aspects from the working fields of thermodynamics of turbomachinery, aerodynamics, rotordynamics, and noise propagation computation. In this broadly interdisciplinary subject, thermodynamics of turbomachinery is used to design the turbocharger and to determine its operating conditions. Aerodynamics is needed to study the compressor flow dynamics and flow instabilities of rotating stall and surge, which can produce growling and whining-type noises. Rotordynamics is necessary to study rotor unbalance and self-excited oil-whirl instabilities, which lead to whistling and constant tone-type noises in rotating floating oil-film type bearings
