By Hung Nguyen-Schäfer
Aero and Vibroacoustics of car Turbochargers is a subject related to points from the operating fields of thermodynamics of turbomachinery, aerodynamics, rotordynamics, and noise propagation computation.
In this commonly interdisciplinary topic, thermodynamicsof turbomachinery is used to layout the turbocharger and to figure out its working stipulations. Aerodynamics is required to check the compressor circulate dynamics and circulation instabilities of rotating stall and surge, which may produce growling and whining-type noises. Rotordynamics is important to review rotor unbalance and self-excited oil-whirl instabilities, which result in whistling and incessant tone-type noises in rotating floating oil-film style bearings. For the particular case of turbochargers utilizing ball bearings, a few high-order harmonic and put on noises additionally take place within the rotor working variety. finally, noise propagation computation, based on Lighthill’s analogy, is needed to enquire airborne noises produced via turbochargers in passenger vehicles.
The content material of this e-book is meant for complex undergraduates, graduates in mechanical engineering, learn scientists and practising engineers who are looking to larger comprehend the interactions among those operating fields and the ensuing effect at the fascinating subject of Aero and Vibroacoustics of automobile Turbochargers.
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The sidebands occurring at the sub- and supersynchronous frequencies are generated by the propagated noise waves at different frequencies. Note that the more visibly the sidebands appear in the sound spectra plot (Waterfall plot), the more nonlinearly the aeroacoustic system responds. The response amplitude of the nonlinear aeroacoustic system is resulted from all component amplitudes of the propagating noise waves and sidebands combined together. As a result, the noise response amplitude is intensified; the aeroacoustic behavior becomes much more nonlinear at large perturbation amplitudes in turbulent flows at high Reynolds numbers.
The following computing steps must be carried out to find the noise pressure solution of Eq. 61a) in the acoustic field V: • Compute the terms aij in Eq. 61b) and the rhs term qi in Eq. 61a) at the boundary conditions given in Eqs. 44c–e); • Compute the mean noise pressure in the discretized finite elements according to Eq. 59). 4 Frequency Modulations of Nonlinear Aeroacoustics Nonlinear aeroacoustics deals with large noise perturbation amplitudes in which the acoustic characteristics are no longer linear.
Within a few meters from the vehicle). The Lighthill’s equations given in Eqs. 31b) with the noise source terms on the rhs are usually solved by the three-dimensional CAA program (3-D CAA) based on the FEM and BEM for complex systems [1–3]. As an example, such complex simulation models are applied in automotive industries where the noise sources induced from the turbocharger, as discussed in Sect. 2, are transmitted through the bearing center housing, compressor housing, charge-air intercoolers, air inlet system, exhaust-gas system (catalyzer, DPF, and muffler), and car frame to the cabin.
Aero and Vibroacoustics of Automotive Turbochargers by Hung Nguyen-Schäfer