Introductory Course on Theory and Practice of Mechanical Vibrations

Science & Math

Gupta, K.

Rao, J.S.

Technology

Halsted Pr

Fatigue failures of blades is one of the most vexing problems of turbomachine manufacturers, ever since the steam turbine became the mainstay for power generating equipment and gas turbines are increasingly used in air transport. The problem is very complex, involving the excitation due to aerodynamic stage interaction; damping due to material deformation, friction at slip surfaces and aerodynamic damping; vibration of an aysmmetric aerofoil tapered along its length and mounted on a rotating disc at a stagger angle. The problem is also governed by heat transfer analysis and thermal stresses.
This book deals with a basic understanding of free vibratory behaviour of turbine blades -- free standing, packetted, and bladed-discs. The analysis is based on continuous and discrete models using energy principles and finite element techniques. A clear understanding of the interference phenomenon in thin cambered airfoil stage in subsonic flow is presented to determine the nonsteady excitation forces acting on the blades. A comprehensive treatment on the blade damping phenomenon that occurs in turbines is given. The nonlinear damping models account for material damping and friction damping as a function of rotational speed for each mode. Resonant response calculation procedures for the steadily-running as well as accelerating blades are given. Cumulative damage calculations are then outlines for fatigue life estimation of turbomachine blades. The book also deals with heat transfer analysis and thermal stress calculations which help in a comprehensive understanding of the blade problems.

Turbomachine Blade Vibration

Engineering & Transportation

Engineering

New Age

Addresses the problems faced by rotating and reciprocating machinery dynamics in torsional vibrations--both steady and transients; the unbalance response of rotors mounted on fluid film bearings under steady and transient operating conditions; and the instabilities in bending, torsion motions. Using a practical approach, it features current developments in such topics as dual rotor systems used in modern gas turbines; the optimum designs of hydrodynamic bearings for minimum unbalance response; transient response of Jeffcott type rotors using time marching techniques; instability analysis of cracked rotors and much more. Along with actual case studies and rotor examples, it aids the analyst in developing computer models of rotors using more accuracy and less time.

Rotor Dynamics

wiley

Addresses analytical and graphical methods, numerical techniques and stability analysis in a comprehensive manner with engineering examples at various stages in the text. Discusses the development of diverse theories, outlining the latest refinements to classical theories of bars, rods and beams. Features a number of case studies regarding axial vibration (including viscoelastic members) and torsional vibrations of noncircular cross section rods. Contains extensive coverage of lateral vibration of beams, Coriolis effects, nonlinear vibrations, pretwisted and sandwiched beams and much more.

Advanced Theory of Vibration: (Nonlinear Vibration and One Dimensional Structures)

John Wiley and Sons Ltd.

The blade life estimation is a multifaceted technology, involving free and forced vibration forces, that lead to the determination of steady and dynamic stresses at different critical speeds during the startup and shutdown procedures, as well as in the operational speed range.Propagation and unstable fracture are described with practical examples to estimate blade life.

Turbine Blade Life Estimation

Astronomy & Space Science

Alpha Science

  This volume offers a tool for High Performance Computing (HPC). A brief historical background on the subject is first given. Fluid Statics dealing with Pressure in fluids at rest, Buoyancy and Basics of Thermodynamics are next presented.  The Finite Volume Method, the most convenient process for HPC, is explained in one-dimensional approach to diffusion with convection and pressure velocity coupling. Adiabatic, isentropic and supersonic flows in quasi-one dimensional flows in axisymmetric nozzles is considered before applying CFD solutions. Though the theory is restricted to one-dimensional cases, three-dimensional CFD examples are also given. Lastly, nozzle flows with normal shocks are presented using turbulence models.  Worked examples and exercises are given in each chapter.   Fluids transport thermal energy for its conversion to kinetic energy, thus playing a major role that is central to all heat engines. With the advent of rotating machinery in the 20th century, Fluid Engineering was developed in the form of hydraulics and hydrodynamics and adapted in engineering Schools across the world until recent times. With the High Performance Computing (HPC) in recent years, Simulation Based Engineering Science (SBES) has gradually replaced the conventional approach in Fluid Flow Design bringing Science directly into Engineering without approximations. Hence this SpringerBrief in Applied Sciences and Technology.   This book brings SBES to an entry level allowing young students to quickly adapt to modern design practices.  

Simulation Based Engineering in Fluid Flow Design (Springerbriefs in Applied Sciences and Technology)

Physics

Springer

Fatigue failures of blades is one of the most vexing problems of turbomachine manufacturers, ever since the steam turbine became the main stay for power generating equipment and gas turbines are increasingly used in the air transport. The problem is very complex, involving the excitation due to aerodynamic stage interaction; damping due to material deformation, friction at slip surfaces and aerodynamic damping; vibration of an asymmetric aerofoil tapered along its length and mounted on a rotating disc at a stagger angle. The problem is also governed by heat transfer analysis and thermal stresses. His book deals with a basic understanding of free vibratory behaviour of turbine blades- free standing, packetted, and bladed-discs. The analysis is based on continuous and discrete models using energy principles and finite element techniques. A clear understanding of the interference phenomenon in a thin cambered airfoil stage in subsonic flow is presented to determine the nonsteady excitation forces acting on the blades. A comprehensive treatment on the blade damping phenomenon that occurs in turbines is given. The nonlinear damping models account for material damping and friction damping as a function of rotational speed for each mode. Resonant response calculation procedures for the steadily running as well as accelerating blades are given. Cumulative damage calculations are then outlined for fatigue life estimation of turbomachine blades. The book also deals with heat transfer analysis and thermal stress calculations which help in a comprehensive understanding of the blade problems. About the author: prof. J.s. Rao (hons.), m. Tech, ph.d., d.sc, taught at the indian institute of technology, kharagpur and delhi for over 30 years. He has also taught at the university of surrey, as a

The third revised and enlarged edition of the book presents an in-depth study of the dynamic Behaviour of rotating and reciprocating machinery. It evolved out of lectures delivered at different universities over the last two decades. The book deals with torsional and bending vibrations of rotors, stability aspects, balancing and condition monitoring. Closed form solutions are given wherever possible and parametric studies presented to give a clear understanding of the subject. Transfer matrix methods is extensively used for general class of rotors for both bending and torsional vibrations. Special attentions are given to transient analysis of the rotors which is becoming an essential part of the design of high speed machinery. Systems with fluid film bearings, cracked rotors and two spool rotors are also presented. A first course on theory of vibration is a prerequisite to this study. Analysis used is fairly simple, but sufficiently advanced to the requisite level of predicting practical observations. As far as possible, practical examples are illustrated, so that the book is also useful to practising engineers. A special feature of this book is diagnostics of rotating machinery using vibration signature analysis and application of expert systems to a field engineer in trouble shooting work.

Rotor Dynamics (Third Edition)

New Age International Publisher

Basic theories plates, variational principles and the use of delta operator that facilitate the derivation of differential equations and boundary conditions are explained.

Dynamics of Plates

Narosa Publishing House

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Books by Rao, J.S.

See the best price to sell, buy, or rent books by Rao, J.S.. BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

Introductory Course on Theory and Practice of Mechanical Vibrations

Turbomachine Blade Vibration

Rotor Dynamics

Advanced Theory of Vibration: (Nonlinear Vibration and One Dimensional Structures)

Introductory Course on Theory and Practice of Mechanical Vibrations

Turbine Blade Life Estimation

Simulation Based Engineering in Fluid Flow Design (Springerbriefs in Applied Sciences and Technology)

Turbomachine Blade Vibration

Rotor Dynamics (Third Edition)

Dynamics of Plates