Abstract
THE development of high-speed mechanical engines and similar devices has, during the last decade, brought forth a demand for both recording vibration amplitudes with accuracy and the analysis of such wave-forms as are thus obtained. The present author, while indicating methods of recording, is largely concerned with analysis, which is rendered complicated by the fact of frequencies which are not exact multiples. It is therefore necessary to extract beats and to endeavour to relate them to various other frequency components which are inherent in the wave-form. The precise analysis of the frequencies is essential in order that the source of the vibration component may be traced. It is important, therefore, that an exact record is taken simultaneously of any fundamental frequency of rotation in the machines being tested; but the author shows that variations in the actual speed of the record can be tolerated, provided this extra recording, as well as the time-scale, is also made. The author is to be congratulated on the completeness of his practical treatment, and the advice he has to give in interpretation; in particular, mechanical analysers are dealt with, especially that one devised by J. Harvey.
Waveform Analysis A Guide to the Interpretation of Periodic Waves, including Vibration Records
R. G.
Manley
By Pp. xi + 275 + 3 plates. (London:Chapman and Hall, Ltd., 1945.) 21s. net.
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HUGHES, L. Waveform Analysis A Guide to the Interpretation of Periodic Waves, including Vibration Records. Nature 156, 765 (1945). https://doi.org/10.1038/156765c0
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DOI: https://doi.org/10.1038/156765c0