Hydrodynamic forces on submerged floating tube: The effect of curvature radius and depth level

Abstract

The discussion of hydrodynamic forces becomes an important issue in determining the dynamic behaviour of the Submerged Floating Tunnel Bridge (SFTB) structure. As stated in the Morison Equation, the hydrodynamic forces are affected by the kinematics of water particles, but up to this date, there are only a few discussions for curved tube applications. This paper discusses the effect of curvature radius and depth level on hydrodynamic forces to get the correction factor for a straight tube. Tubes with variations in radius curvature (R/L) and diameter (D) were installed in a wave pool with a depth level (z/d). The hydrodynamic forces were detected by a load cell sensor placed on a pedestal at the end of the specimen. The data from the load cell was processed by the data acquisition system and displayed on the monitor screen, showing that the z/d ratio and the R/L ratio both affect the hydrodynamic forces. A larger z/d ratio (deeper) results in smaller hydrodynamic forces, while a smaller R/L ratio (more curved) results in smaller hydrodynamic forces. A correction factor (C) has been determined to calculate the hydrodynamic force on a curved tube based on the Morison equation.

Media Pembangkit Gelombang Skala Laboratorium

“…Pada perancangan struktur bangunan lepas pantai diperlukan perhitungan perhitungan dengan melihat faktor-faktor yang terjadi di lautan tersebut. Faktor dominan yang terjadi adalah gaya gangguan gelombang ombak yang dapat mengganggu kekuatan struktur bangunan, misalnya gangguan ombak terhadap kabel bawah laut [1], [2], Tension Leg Platform [3], [4], [5] and Submerged Floating Tunnel [6].…”

“…Puli output gearbox ini menggunakan ukuran 6 cm dan menyalurkan putaran ke puli rotor eksentris dengan ukuran 15 cm. Kecepatan rotor eksentris dapat dihitung dengan Persamaan (6). rpm (6) Rotor eksentris memiliki eksentrisitas 3 cm, 5 cm dan 8 cm sebagaimana yang terlihat pada Gambar 9.…”

“…Kecepatan rotor eksentris dapat dihitung dengan Persamaan (6). rpm (6) Rotor eksentris memiliki eksentrisitas 3 cm, 5 cm dan 8 cm sebagaimana yang terlihat pada Gambar 9. Selanjutnya putaran poros eksentrisitas diteruskan ke papan pengombak dengan sebuah batang penghubung sebagaimana yang terlihat pada Gambar 10, dan analisisnya dianggap sebagai mekanisme engkol peluncur.…”