Investigation effect of circumferential mode number on natural frequencies of under-water vibrations of cylindrical shells numerically and experimentally

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NAJAFI MOHAMMADREZA; Mahjoub Moghadas Saeed; MORTAZAVI SEYYED MOHAMMAD; SALARI MAHMOUD

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Journal Paper

Paper Information

Journal: JOURNAL OF VIBRATION AND SOUND Year:2020 | Volume:9 | Issue:18 Page(s): 3-18

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Title

Investigation effect of circumferential mode number on natural frequencies of under-water vibrations of cylindrical shells numerically and experimentally

Author(s)

NAJAFI MOHAMMADREZA | Mahjoub Moghadas Saeed | MORTAZAVI SEYYED MOHAMMAD | SALARI MAHMOUD | Issue Writer Certificate

Keywords

Circumferential mode number

Fluid-solid interaction

Under-water vibrations

natural frequency

mode shape

Abstract

In the present study, the effect of Circumferential mode number on natural frequencies of cylindrical shells was investigated numerically and experimentally. Three cylindrical shells with different diameter to length ratios were examined. Different contact type with water were compared using both numerical simulation and experimental tests. The effects of immersion depth, diameter to length ratio, variations of natural frequency with different Circumferential mode number were investigated. The reduction of the natural frequencies of the cylindrical shell for the minimum frequency of different Circumferential mode number is low, but it increases for higher and lower frequencies, and at the beginning of immersion and at full immersion, the frequency decreases suddenly. Also, as the ratio of diameter to shell length decreases, the frequencies of the low Circumferential mode number decrease and the lower value of the natural frequency tends to lower Circumferential mode number. At low Circumferential mode number, the natural frequencies differ considerably, and with increase of n number, the difference decreases and converges.

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APA: Copy

NAJAFI, MOHAMMADREZA, Mahjoub Moghadas, Saeed, MORTAZAVI, SEYYED MOHAMMAD, & SALARI, MAHMOUD. (2020). Investigation effect of circumferential mode number on natural frequencies of under-water vibrations of cylindrical shells numerically and experimentally. JOURNAL OF VIBRATION AND SOUND, 9(18 ), 3-18. SID. https://sid.ir/paper/411207/en

Vancouver: Copy

NAJAFI MOHAMMADREZA, Mahjoub Moghadas Saeed, MORTAZAVI SEYYED MOHAMMAD, SALARI MAHMOUD. Investigation effect of circumferential mode number on natural frequencies of under-water vibrations of cylindrical shells numerically and experimentally. JOURNAL OF VIBRATION AND SOUND[Internet]. 2020;9(18 ):3-18. Available from: https://sid.ir/paper/411207/en

IEEE: Copy

MOHAMMADREZA NAJAFI, Saeed Mahjoub Moghadas, SEYYED MOHAMMAD MORTAZAVI, and MAHMOUD SALARI, “Investigation effect of circumferential mode number on natural frequencies of under-water vibrations of cylindrical shells numerically and experimentally,” JOURNAL OF VIBRATION AND SOUND, vol. 9, no. 18 , pp. 3–18, 2020, [Online]. Available: https://sid.ir/paper/411207/en

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