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This book presents tensors and differential geometry in a
comprehensive and approachable manner, providing a bridge from the
place where physics and engineering mathematics end, and the place
where tensor analysis begins. Among the topics examined are tensor
analysis, elementary differential geometry of moving surfaces, and
k-differential forms. The book includes numerous examples with
solutions and concrete calculations, which guide readers through
these complex topics step by step. Mindful of the practical needs
of engineers and physicists, book favors simplicity over a more
rigorous, formal approach. The book shows readers how to work with
tensors and differential geometry and how to apply them to modeling
the physical and engineering world. The authors provide
chapter-length treatment of topics at the intersection of advanced
mathematics, and physics and engineering: * General Basis and
Bra-Ket Notation * Tensor Analysis * Elementary Differential
Geometry * Differential Forms * Applications of Tensors and
Differential Geometry * Tensors and Bra-Ket Notation in Quantum
Mechanics The text reviews methods and applications in
computational fluid dynamics; continuum mechanics; electrodynamics
in special relativity; cosmology in the Minkowski four-dimensional
space time; and relativistic and non-relativistic quantum
mechanics. Tensor Analysis and Elementary Differential Geometry for
Physicists and Engineers benefits research scientists and
practicing engineers in a variety of fields, who use tensor
analysis and differential geometry in the context of applied
physics, and electrical and mechanical engineering. It will also
interest graduate students in applied physics and engineering.
This book comprehensively presents the computational design of
rolling bearings dealing with many interdisciplinary difficult
working fields. They encompass elastohydrodynamics (EHD), Hertzian
contact theory, oil-film thickness in elastohydrodynamic
lubrication (EHL), bearing dynamics, tribology of surface textures,
fatigue failure mechanisms, fatigue lifetimes of rolling bearings
and lubricating greases, Weibull distribution, rotor balancing, and
airborne noises (NVH) in the rolling bearings. Furthermore, the
readers are provided with hands-on essential formulas based on the
up-to-date DIN ISO norms and helpful examples for computational
design of rolling bearings. The topics are intended for
undergraduate and graduate students in mechanical and material
engineering, research scientists, and practicing engineers who want
to understand the interactions between these working fields and to
know how to design the rolling bearings for automotive industry and
many other industries.
This book presents tensors and differential geometry in a
comprehensive and approachable manner, providing a bridge from the
place where physics and engineering mathematics end, and the place
where tensor analysis begins. Among the topics examined are tensor
analysis, elementary differential geometry of moving surfaces, and
k-differential forms. The book includes numerous examples with
solutions and concrete calculations, which guide readers through
these complex topics step by step. Mindful of the practical needs
of engineers and physicists, book favors simplicity over a more
rigorous, formal approach. The book shows readers how to work with
tensors and differential geometry and how to apply them to modeling
the physical and engineering world. The authors provide
chapter-length treatment of topics at the intersection of advanced
mathematics, and physics and engineering: * General Basis and
Bra-Ket Notation * Tensor Analysis * Elementary Differential
Geometry * Differential Forms * Applications of Tensors and
Differential Geometry * Tensors and Bra-Ket Notation in Quantum
Mechanics The text reviews methods and applications in
computational fluid dynamics; continuum mechanics; electrodynamics
in special relativity; cosmology in the Minkowski four-dimensional
space time; and relativistic and non-relativistic quantum
mechanics. Tensor Analysis and Elementary Differential Geometry for
Physicists and Engineers benefits research scientists and
practicing engineers in a variety of fields, who use tensor
analysis and differential geometry in the context of applied
physics, and electrical and mechanical engineering. It will also
interest graduate students in applied physics and engineering.
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.
Rotordynamics of automotive turbochargers is dealt with in this
book encompassing the widely working field of small turbomachines
under real operating conditions at the very high rotor speeds up to
300000 rpm. The broadly interdisciplinary field of turbocharger
rotordynamics involves 1) Thermodynamics and Turbo-Matching of
Turbochargers 2) Dynamics of Turbomachinery 3) Stability Analysis
of Linear Rotordynamics with the Eigenvalue Theory 4) Stability
Analysis of Nonlinear Rotordynamics with the Bifurcation Theory 5)
Bearing Dynamics of the Oil Film using the Two-Phase Reynolds
Equation 6) Computation of Nonlinear Responses of a Turbocharger
Rotor 7) Aero and Vibroacoustics of Turbochargers 8) Shop and Trim
Balancing at Two Planes of the Rotor 9) Tribology of the Bearing
Surface Roughness 10) Design of Turbocharger Platforms using the
Similarity Laws The rotor response of an automotive turbocharger at
high rotor speeds is studied analytically, computationally, and
experimentally. Due to the nonlinear characteristics of the
oil-film bearings, some nonlinear responses of the rotor besides
the harmonic response 1X, such as oil whirl, oil whip, and
modulated frequencies occur in Waterfall diagram. Additionally, the
influences of the surface roughness and oil characteristics on the
rotor behavior, friction, and wear are discussed. This book is
written by an industrial R&D expert with many years of
experience in the automotive and turbocharger industries. The
all-in-one book of turbochargers is intended for scientific and
engineering researchers, practitioners working in the rotordynamics
field of automotive turbochargers, and graduate students in applied
physics and mechanical engineering.
This book deals with rotordynamics of automotive turbochargers
while encompassing the analysis of the dynamics of rotating
machines at very high rotor speeds of 300,000 rpm and above. This
interdisciplinary field involves 1. thermodynamics and
turbo-matching knowledge to compute working conditions of
turbochargers, 2. fluid and bearing dynamics to calculate various
operating thrust loads and to design the rotating floating ring
bearings (two-oil-film bearings), and 3. tribology to improve the
rotor stability and to reduce the bearing friction. Mathematical
background in modeling and simulation methods is necessary;
however, the prerequisites have been kept to a minimum. The book
addresses both practitioners working in the field of rotordynamics
of automotive turbochargers and graduate students in mechanical
engineering.
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.
This book comprehensively presents the computational design of
rolling bearings dealing with many interdisciplinary difficult
working fields. They encompass elastohydrodynamics (EHD), Hertzian
contact theory, oil-film thickness in elastohydrodynamic
lubrication (EHL), bearing dynamics, tribology of surface textures,
fatigue failure mechanisms, fatigue lifetimes of rolling bearings
and lubricating greases, Weibull distribution, rotor balancing, and
airborne noises (NVH) in the rolling bearings. Furthermore, the
readers are provided with hands-on essential formulas based on the
up-to-date DIN ISO norms and helpful examples for computational
design of rolling bearings. The topics are intended for
undergraduate and graduate students in mechanical and material
engineering, research scientists, and practicing engineers who want
to understand the interactions between these working fields and to
know how to design the rolling bearings for automotive industry and
many other industries.
This monograph presents computational models that describe
electro-mechanical characteristics of tapered and cylinder roller
bearings in various industrial applications. Applying the
Levenberg-Marquardt's algorithm to solving strongly nonlinear
coupled equation systems, the computational models consisting of
many circular slices per rolling element enable computations of the
local Hertzian pressures at the elastohydrodynamic (EHD) contact
area, the relating oil-film thickness in elastohydrodynamic
lubrication (EHL), the limiting voltage of electro-pitting, bearing
frictions, and fatigue lifetimes of the bearings for various load
spectra. Using the best-known machine-learning method for
clustering, the load spectrum is clustered in k cluster means based
on the invariant damage number to accelerate the load spectrum.
Furthermore, the accelerated load spectrum is used for the testing
procedure of the bearings to reduce the testing time and costs as
well. The target audience of this book primarily comprises graduate
students in mechanical engineering and practicing engineers of
electro-machines and transmission systems who want to
computationally design tapered and cylinder roller bearings for the
automotive industry and other industries, and to deeply dive into
these relating working fields.
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