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Habibi, Nabard, Ahmadi, Y.. (1400). Influence of material and internal support on natural frequencies of thin-walled cylindrical tanks. فناوری آموزش, 11(2), 381-395. doi: 10.22061/jcarme.2020.6073.1774
Nabard Habibi; Y. Ahmadi. "Influence of material and internal support on natural frequencies of thin-walled cylindrical tanks". فناوری آموزش, 11, 2, 1400, 381-395. doi: 10.22061/jcarme.2020.6073.1774
Habibi, Nabard, Ahmadi, Y.. (1400). 'Influence of material and internal support on natural frequencies of thin-walled cylindrical tanks', فناوری آموزش, 11(2), pp. 381-395. doi: 10.22061/jcarme.2020.6073.1774
Habibi, Nabard, Ahmadi, Y.. Influence of material and internal support on natural frequencies of thin-walled cylindrical tanks. فناوری آموزش, 1400; 11(2): 381-395. doi: 10.22061/jcarme.2020.6073.1774

Influence of material and internal support on natural frequencies of thin-walled cylindrical tanks

Journal of Computational & Applied Research in Mechanical Engineering (JCARME)
مقاله 8، دوره 11، شماره 2 - شماره پیاپی 22، خرداد 2022، صفحه 381-395    اصل مقاله (1015.74 K)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22061/jcarme.2020.6073.1774
نویسندگان
Nabard Habibi* 1؛ Y. Ahmadi2
1Mechanical Engineering Department, University of Kurdistan, Sanandaj, Iran
2Civil Engineering Department, University of Kurdistan, Sanandaj, Iran
تاریخ دریافت: 17 مهر 1398،  تاریخ بازنگری: 26 خرداد 1399،  تاریخ پذیرش: 27 خرداد 1399 
چکیده
Water storage tanks are amongst the essential infrastructures, and the study of their natural frequencies plays a pivotal role in predicting and detecting dynamic behavior. Therefore, it helps to the uninterrupted operation of an industrial plant and the use of tank water in emergencies. This paper studies the influence of different shell materials, including steel, aluminum, and laminated composites with three types of different fiber orientations, on the natural frequencies of thin-walled aboveground water storage tanks that have pinned boundary conditions at the base. Models investigated in this paper, either the roof is without an internal support structure or else a group of columns and radial beams are used for supporting it. These huge tanks had the height to diameter ratio of 0.4, and a water surface at 90% of the height of the tank's cylinder. The thicknesses of the cylindrical shells are tapered. The tanks without internal support included the vibrations that affect the cylinder mode shapes or the roof mode shapes or simultaneously both the cylinder and roof mode shapes. On the other hand, the mode shapes of the tanks with internal support affect predominantly only the cylinder. Among the studied tanks, the third type of composite tanks had the highest rigidity, and the first type of composite tanks had the lowest rigidity. The natural frequencies related to the first modes of vibrations for cylinder and roof shells with a wide range of circumferential wave numbers (n) and an axial half-wave (m) are studied.       
کلیدواژه‌ها
Natural frequency؛ Thin walled؛ Cylindrical tanks؛ Internal support؛ Composite material
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