Aero and Vibroacoustics of Automotive Turbochargers [recurso electrónico

**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. For the special case of turbochargers using ball bearings, some high-order harmonic and wear noises also manifest in the rotor operating range. Lastly, __noise propagation computation,__ based on Lighthill’s analogy, is required to investigate airborne noises produced by turbochargers in passenger vehicles. The content of this book is intended for advanced undergraduates, graduates in mechanical engineering, research scientists and practicing engineers who want to better understand the interactions between these working fields and the resulting impact on the interesting topic of Aero and Vibroacoustics of Automotive Turbochargers. 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. For the special case of turbochargers using ball bearings, some high-order harmonic and wear noises also manifest in the rotor operating range. Lastly, noise propagation computation, based on Lighthill’s analogy, is required to investigate airborne noises produced by turbochargers in passenger vehicles. The content of this book is intended for advanced undergraduates, graduates in mechanical engineering, research scientists and practicing engineers who want to better understand the interactions between these working fields and the resulting impact on the interesting topic of Aero and Vibroacoustics of Automotive Turbochargers. Front Matter....Pages i-xv Introduction to Turbocharging....Pages 1-9 Induced Noise Types....Pages 11-14 Acoustic Propagation Theory....Pages 15-44 Analyzing Root Causes of Noise....Pages 45-72 Computational Nonlinear Rotordynamics of Turbochargers....Pages 73-87 Subsynchronous Constant Tone....Pages 89-108 Eigenfrequency Modifications to Reduce Constant Tone Level....Pages 109-112 Back Matter....Pages 113-136 This book spans disciplines to explore aero and vibroacoustics in turbochargers from many perspectives: thermodynamics of turbomachinery, aerodynamics, rotordynamics and noise propagation computation. Benefits advanced students, researchers and engineers.