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Transient processes in a thin elastic plate loaded with airстатья
- Авторы: Mironov M.A., Korolkov A.I., Shanin A.V., Kniazeva K.S.
- Сборник: INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise2020
- Том: 11
- Год издания: 2020
- Место издания: Seoul, Korea
- Первая страница: 5486
- Последняя страница: 5497
- Аннотация: Propagation of a short pulse excitation in a thin elastic plate loaded with air is studied. This pulse contains elastic waves having phase velocities that are close to the sound speed in the air. Due to the phase synchronism phenomenon such waves e ectively radiate into the air. Such a radiation has a very narrowband spectrum localized near the phase synchronism frequency. We present a theoretical description of the phenomenon. The problem is studied using the method of analytical continuation of dispersion diagram. Namely, the field is represented as a double Fourier integral on frequency and wavenumber variables. The variables are continued into complex plane. Then, the surface of integration is studied in two-dimensional complex space. A contribution to the field corresponding to the phase synchronism is extracted and represented in terms of special functions.
- Добавил в систему: Корольков Андрей Игоревич