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2003 | Buch | 2. Auflage

Vibrations and Stability

Advanced Theory, Analysis, and Tools

verfasst von: Assoc. prof. dr. techn. Jon Juel Thomsen

Verlag: Springer Berlin Heidelberg

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Über dieses Buch

'Vibrations and Stability' is aimed at third to fifth-year undergraduates and post­ graduates in mechanical or structural engineering. The book covers a range of subjects relevant for a one-or two-semester course in advanced vibrations and stability. Also, it can be used for self-study, e. g. , by students on master or PhD projects, researchers, and professional engineers. The focus is on nonlinear phe­ nomena and tools, covering the themes of local perturbation analysis (Chaps. 3 and 4), bifurcation analysis (Chap. 5), global analysis I chaos theory (Chap. 6), and special high-frequency effects (Chap. 7). The ground for nonlinear analysis is laid with a brief summary of elementary linear vibration theory (Chap. 1), and a treatment of differential eigenvalue problems in some depth (Chap. 2). Also, there are exercise problems and extensive bibliographic references to serve the needs of both students and more experienced users; major exercises for course-work; and appendices on numerical simulation, standard mathematical formulas, vibration properties of basic structural elements, and properties of engineering materials. This Second Edition is a revised and expanded version of the first edition (pub­ lished by McGraw-Hill in 1997), reflecting the experience gathered during its now six years in service as a classroom or self-study text for students and researchers. The second edition contains a major new chapter (7), three new appendices, many new exercise problems, more than 120 new and updated bibliographic references, and hundreds of minor updates, corrections, and clarifications.

Inhaltsverzeichnis

Frontmatter
1. Vibration Basics
Abstract
This chapter surveys some fundamental concepts, methods and phenomena associated with vibrations. Included only as a reference for subsequent chapters, it assumes the reader to be reasonably familiar with the topics described. The presentation will be brief, with few examples and no proofs.
Jon Juel Thomsen
2. Eigenvalue Problems of Vibrations And Stability
Abstract
Solving problems of vibrations and stability almost inevitably involves solving eigenvalue problems (EVPs). In vibration analysis one is faced with an EVP when free responses are to be determined, or when forced responses are to be expanded in terms of free mode shapes. Also, EVPs occur when critical buckling loads and modes are to be determined in problems of elastic stability. EVPs occur repeatedly in subsequent chapters of this book.
Jon Juel Thomsen
3. Nonlinear Vibrations: Classical Local Theory
Abstract
A linear system represents a mathematical abstraction — a useful and productive invention of the human mind. However, the physical systems found in nature and manmade devices are inherently nonlinear. If in doubt, try imagining any physical system subjected to a relevant excitation of increasing magnitude: pump energy into the system and it will respond in some way. Initially, the state of the system may change in proportion to the applied load, but at some point the change will inevitably be disproportional. Ultimately, given unlimited power supplies, the system may break apart into two or more subsystems, or reorganize itself into a qualitatively different type of system. Nature does not recognize straight lines.
Jon Juel Thomsen
4. Nonlinear Multiple-DOF Systems: Local Analysis
Abstract
Certain nonlinear phenomena can occur only with systems having multiple degrees of freedom. Thus, nonlinear interaction requires the presence of at least two components that can interact. In this chapter we shall consider only 2-DOF systems, since these will suffice for illustrating important properties of nonlinear multiple-DOF systems in general. A 2-DOF model typically arises as an approximation to a real multiple-DOF or continuous system, for which a single-DOF model fails to describe the behavior to be studied.
Jon Juel Thomsen
5. Bifurcations
Abstract
Bifurcations mark the qualitative changes in system behavior that may occur when the parameters of a system are varied. For example, for a damped pendulum a bifurcation occurs when the damping parameter is changed from zero to a small positive value, because an undamped pendulum behaves in a qualitatively different way from a damped pendulum.
Jon Juel Thomsen
6. Chaotic Vibrations
Abstract
Mathematical models sometimes behave unpredictably, as do many systems of the real world. If there are no stochastic components, or if these are considered to be inessential, we then speak about deterministic chaos, chaotic dynamics or, in case of vibrating structures, of chaotic vibrations.
Jon Juel Thomsen
7. Special Effects of High-Frequency Excitation
Abstract
What happens with a system being excited at a very high frequency, far beyond the highest underdamped natural frequency? You might think it simply responds at a similar high frequency in a trivial manner, since resonance effects are not at play. Indeed, vibration experts are typically trained to neglect possible high-frequency (HF) components of excitations. This often makes sense, since mechanical systems are low-pass filters, with a frequency response quickly vanishing beyond the highest subcritically damped natural frequency.
Jon Juel Thomsen
Backmatter
Metadaten
Titel
Vibrations and Stability
verfasst von
Assoc. prof. dr. techn. Jon Juel Thomsen
Copyright-Jahr
2003
Verlag
Springer Berlin Heidelberg
Electronic ISBN
978-3-662-10793-5
Print ISBN
978-3-642-07272-7
DOI
https://doi.org/10.1007/978-3-662-10793-5