title: Rotational and translational oscillations of cylinders of small aspect ratio in the air flow
metadata.name: dc.contributor.author
metadata.value: Ryabinin, Anatoly N.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Veligzhanin, Andrei A.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2022-12-27T17:18:09Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2022-12-27T17:18:09Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2022-12
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Ryabinin A.N., Veligzhanin A.A. Rotational and translational oscillations of cylinders of small aspect ratio in the air flow. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2022, vol. 9 (67), issue 4, pp. 729–739. https://doi.org/10.21638/spbu01.2022.414 (In Russian)
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/spbu01.2022.414
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/38731
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Rotational and translational oscillations of three cylinders differing in the ratio of length
  to cylinder diameter (elongation) are considered. The cylinders were suspended in the test
  section of the low velocity wind tunnel on a wire suspension containing steel springs. In
  the equilibrium position, the axis of the cylinders is directed horizontally and parallel to
  the velocity vector of the incoming flow. Under the influence of the air flow, the cylinders
  could make rotational or translational oscillations. Semiconductor strain gauges are
  attached to the two suspension springs, measuring the periodically changing tension of the
  springs during oscillations. The analog signal from the strain gauges was transmitted to a
  PC oscilloscope, which transmitted it in digital form to a computer. After calibration of the
  device and decoding of the signal, the frequencies and amplitudes of translational oscillations
  in the vertical direction and rotational oscillations around the horizontal axis passing
  through the center of the cylinder and perpendicular to the velocity vector of the incoming
  flow were determined. It turned out that in the studied range of cylinder elongations there
  is a transition from rotational to translational oscillations. A cylinder with elongation 1.9
  performs steady rotational oscillations under the influence of wind, the amplitude of which
  increases with increasing air flow velocity. The previously proposed mathematical model
  correctly predicts rotational oscillations. The square of the amplitude of rotational oscillations
  is a linear function of the Strouhal number if the velocity of the air flow is sufficiently
  large. Translational oscillations of the cylinder with elongation 1.9 are damped. A decrease
  in the elongation of the cylinder to 1.5 is accompanied by a decrease in the amplitudes
  of rotational vibrations. At low air flow velocities, translational oscillations with a small
  amplitude are registered. Further reduction of the elongation to 1.0 leads to the complete
  absence of rotational oscillations. The amplitude of translational oscillations is growing.
  Translational oscillations are realized in a limited range of air flow velocities.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 9 (67); Issue 4
metadata.lang: -
metadata.name: dc.subject
metadata.value: wind tunnel
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: rotational oscillations
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: translational oscillations
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: strain gauge
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: cylinder
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Rotational and translational oscillations of cylinders of small aspect ratio in the air flow
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 729-739.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/38731/1/729-739.pdf
resources.format: Adobe PDF
resources.size: 834,28 kB