Noise and Vibration of Electrical Machines
by: P.L. Timar
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Description
Although the basic theory of the noise of electrical machines was elaborated many years ago, the theoretical knowledge has since been considerably extended. This book discusses the acoustics and noise-measuring systems of electrical machines. It is a fully revised English edition of the authors' book published in Hungarian. A detailed analysis is presented of the electromagnetical, mechanical and aerodynamical vibration and noise sources in electrical machines. A summary of the most recent developments in noise pollution is included, as well as the results of the authors' own observations regarding techniques of reducing the noise level of electrical machines and transformers. The vibro-acoustical measuring-technique of machines is discussed generally, both in the steady-state and transient mode of operation. In addition, the noise of transformers and high voltage transmission lines is examined, and the various practical and theoretical methods for noise and vibration reduction are demonstrated. Special attention has been devoted to those chapters dealing with the specific causes of noises generated by modern, electronically controlled machines. With international trade in mind, the book also provides a critical review of international standards on noise and vibration measurements and evaluation, and the newly developed methods currently being introduced. The book will provide both a theoretical and practical background to designers, planners, engineers, scientific workers, students and technicians involved in this field. List of Contributors: P.L. Timr, A. Fazekas, J. Kiss, A. Mikls, S.J. Yang
Contents
A. Generation and Elimination of Noise and Vibration.
1. Basic acoustic terms. 2. Generation process of noise and vibration in electrical machines. 3. Electromagnetic noise and causes of vibration. 4. Vibration of rotating electrical machines. 5. Generation of airborne noise in electrical machines. 6. The effect of changes in running condition on the noise of rotating electrical machines. 7. Design considerations to reduce noise and vibration of electromagnetic origin. 8. Mechanical noise and vibrations. 9. Noises of aerodynamic origin. 10. Secondary noise reducing measures.
B. Experimental Investigation of Noise and Vibration Phenomena.
11. Measuring noise and vibration phenomena. 12. Measuring the steady-state vibrations of electrical machines. 13. Noise measurements on electrical machines under steady-state operating conditions. 14. Measuring transient noise phenomena. 15. Measuring techniques of transient vibroacoustic signals. 16. Indirect measuring of transient vibroacoustic signals.
C. Some Practical Applications of Vibroacoustic Methods in the Testing of Rotating Electrical Machines.
17. Noise and vibration testing in practice. 18. Applying vibration measurement to assessing the technical condition of rotating machines and to scheduling their maintenance. Epilogue with economic considerations. Appendices. References. Subject Index.
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Designers and engineers who read this book will treasure it as a virtually indispensable handbook to be consulted again and again.