Dynamics of Rotating Machines by John E. T. Penny, Seamus D. Garvey, Arthur W. Lees Michael PDF

By John E. T. Penny, Seamus D. Garvey, Arthur W. Lees Michael I. Friswell

ISBN-10: 0521850169

ISBN-13: 9780521850162

This ebook equips the reader to appreciate each vital element of the dynamics of rotating machines. Will the vibration be huge? What affects desktop balance? How can the vibration be decreased? Which kinds of rotor vibration are the worst? The booklet develops this figuring out before everything utilizing very simple versions for every phenomenon, within which (at such a lot) 4 equations catch the habit. extra unique types are then built in accordance with finite aspect research, to permit the actual simulation of the correct phenomena for genuine machines. research software program (in MATLAB) is linked to this ebook, and rookies to rotordynamics can count on to make reliable predictions of serious speeds and rotating mode shapes inside of days. The e-book is dependent extra as a studying consultant than as a reference tome and offers readers with greater than a hundred labored examples and greater than a hundred difficulties and suggestions.

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Extra resources for Dynamics of Rotating Machines

Sample text

In the system, the mass component moves on a frictionless surface and, because we are going to assume that its motion is restricted to the jc direction only, a single coordinate is sufficient to specify the displacement of the system mass at any instant. The system is said to have only one degree o f freedom. A dynamic force / ( / ) is applied to the mass. Sometimes it is necessary to combine stiffnesses of more than one spring into a single equivalent spring. 3. The springs connected in parallel and series: /«, ho, and are the undeformed lengths of the springs; and X\, and Xi are the extensions due to the force /.

Thus, using the notation of this application, f s = kx. The damping coefficient, c, for a viscous damper is defined as the force required to obtain a unit velocity across the damper. Hence, we have fd = ex. 5, which con­ sists of a disk connected to a shaft and a torsional damper. An external torque, r(f), is applied to the disk. The motion B{t) is such that the shaft is twisted and behaves as a torsional spring. The shaft and torsional damper are assumed to have a negligible polar moment of inertia compared to the disk.

The first half of Chapter 6 extends the calculations to give forced response, so - coupled with Chapter 3 - this can form the core of the course with emphasis on understand­ ing rotordynamic phenomena. The more elementary parts of Chapter 8 (balancing) and Chapter 9 (axial and torsional vibrations) also can be an appropriate part of an introductory course, if time allows. An advanced course might include Chapter 4 to provide a background in FEA (if required). Chapter 5 and the second half of Chapter 6 provide the modeling and analysis of complex rotors using FEA.

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Dynamics of Rotating Machines by John E. T. Penny, Seamus D. Garvey, Arthur W. Lees Michael I. Friswell

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