Tag: Vibroacoustics

Free Download Aero and Vibroacoustics of Automotive Turbochargers By Hung Nguyen-Schäfer (auth.)
2013 | 142 Pages | ISBN: 3642350690 | PDF | 5 MB
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, thermodynamicsof 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.

Free Download Advanced Computational Vibroacoustics: Reduced-Order Models and Uncertainty Quantification
English | 2014 | ISBN: 1107071712 | 136 Pages | PDF | 1.4 MB
Advanced Computational Vibroacoustics presents an advanced computational method for the prediction of sound and structural vibrations, in low- and medium-frequency ranges – complex structural acoustics and fluid-structure interaction systems encountered in aerospace, automotive, railway, naval, and energy-production industries. The formulations are presented within a unified computational strategy and are adapted for the present and future generation of massively parallel computers. A reduced-order computational model is constructed using the finite element method for the damped structure and the dissipative internal acoustic fluid (gas or liquid with or without free surface) and using an appropriate symmetric boundary-element method for the external acoustic fluid (gas or liquid). This book allows direct access to computational methods that have been adapted for the future evolution of general commercial software. Written for the global market, it is an invaluable resource for academic researchers, graduate students, and practising engineers.

Free Download Handbook of Vibroacoustics, Noise and Harshness
English | 2024 | ISBN: 9819780993 | 1273 Pages | PDF EPUB (True) | 199 MB
The handbook covers the topics of vibro-acoustics, noise, harshness and their related applications in detail. Various topics covered in this handbook are acoustics and vibration metrology, environmental noise measurements, building acoustics, acoustical meta-materials, underwater acoustics, soundscape approach, beam forming approach, 3D noise mapping, in-situ acoustical testing, etc. The handbook would provide a single window source of up-to-date information to the researchers, acousticians, noise and vibration control engineers, metrologists, industry, university graduates, masters, academicians, administrators, policymakers, regulators, and other stakeholders for a better understanding of vibro-acoustics, noise, harshness and related applications.