On generation and decrease of the maximums in the vibration spectra of the perforated plate in the flow

• Main Authors: Valery Yu. Kirpichnikov, Alexey P. Koscheev, Yury N. Mukalov, Yury F. Shlemov
• Format: Article
• Language: English
• Published: Krylov State Research Centre 2017-07-01
• Series: Труды Крыловского государственного научного центра
• Subjects: tile in the flow; perforation; location; vibration spectra; frequencies and levels of maximums
• Online Access: http://transactions-ksrc.ru/eng/archive/On-generation-and-decrease-of-the-maximums-in-the-vibration-spectra-of-the-perforated-plate-in-the-flow/
• ISSN: 2542-2324; 2618-8244

Object and purpose of research. This paper investigates how the location of the perforation on a hull plating tile of the vehicle moving in the flow affects the vibration of this tile. Materials and methods. Multi-point vibration measurements on the perforation-free tile in the flow and vibration measurements on the two tiles (in the flow) with different locations of perforation. The effect of the perforation location upon the vibration of the tiles in the flow (in terms of the difference between the measured levels and the change in the vibration spectrum shape) has been determined experimentally. Main results. The most intense maximums in the vibration spectra of the tile in the flow, the perforation being beyond the geometric center, take place if the following conditions are met: one of the Strouhal frequencies coincides with the natural frequency of the tile’s bending vibrations; at the frequency of this coincidence, within the input vibration excitability spectrum of the plate, near the rear edge of the perforation, there is a maximum. Conclusion. It was found how the perforations in the tiles of the objects moving in the flow can be arranged so as to mitigate the growth of their noise and vibration levels.