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Transition radiation in mechanics

,
Mechanical Engineering Institute, Russian Academy of Sciences, ul. Belinskogo 85, Nizhnii Novgorod, 603024, Russian Federation

Transition radiation of elastic waves generated by a mechanical object that performs a uniform rectilinear motion along an inhomogeneous elastic system (a string, beam, membrane, or plate) is discussed in detail. The effect is analysed by assuming that the law of motion of the load admits the generation of neither Cherenkov nor bremsstrahlung radiation, and that the role of inhomogeneties is played by the supports of the elastic system. The radiation reaction spectrum and the loss of contact between the object and the elastic system are considered.The practically important cases of periodically and randomly varying elastic parameters are examined, and the resonance and instability conditions for the vibrations of the radiating object are found. Variation of the main radiation characteristics with the angle at which the object crosses the inhomogeneity region, is examined. The so-called diffraction radiation of elastic waves is briefly discussed.

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Fulltext is also available at DOI: 10.1070/PU1996v039n10ABEH000172
PACS: 83.50.By, 83.50.Pk, 83.50.Tq
DOI: 10.1070/PU1996v039n10ABEH000172
URL: https://ufn.ru/en/articles/1996/10/c/
A1996VV43300002
Citation: Vesnitskii A I, Metrikin A V "Transition radiation in mechanics" Phys. Usp. 39 983–1007 (1996)
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Оригинал: Весницкий А И, Метрикин А В «Переходное излучение в механике» УФН 166 1043–1068 (1996); DOI: 10.3367/UFNr.0166.199610c.1043

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