Experimental investigation on dynamic model testing of a deep-water Riser Support by truncated hybrid method

Abstract

A device Riser Support is designed for Chinese S-Lay vessel 'HYSY-201'. The device is used to install risers as well as subsidiary structures, such as pipeline end termination (PLET), pipeline end manifold (PLEM), in-line sled (ILS) and so on for submarine pipelines. The paper mainly elaborates the finite element analysis and dynamic experiment of the deep-water Riser Support based on a truncated hybrid model. To test the mechanical property and verify the reliability of the Riser Support, some dynamic tests with the scale 1:10 are done to simulate the installation process of risers in the South China Sea. A truncation method is used to solve the problem that 3000 m riser model is still too long though it is reduced to one-tenth of the original size. Six degrees of freedom platform (SDFP) is used to simulate the movement of 'HYSY-201' vessel while a boundary control system (BCS) is also used to control and simulate the motion state of cut-off point of the riser model. SDFP and BCS together make the model test more accurate and reliable. Testing results show that stress values based on 24 kinds of typical working conditions and calculated values are accordant in the range of allowable inaccuracy, but the small error is considered reasonable because of the difference between virtual model and scaled reality model. Then, truncated hybrid method is verified to be very useful in simplifying models during the research of large-size thin tube, rod-shaped or linear model experiment, and especially the 3000 m truncated dynamic hybrid riser model experiment is a good example.

Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System

“…In the model experiment, whether the dynamic characteristics of the model tower and the structural strength have enough similarity with the prototype are very important to the reliability of the prototype-related properties of the experimental model. We could simulate and compare the scaled model with the prototype to verify the similarity of the experimental scaling model [28].…”

Research on the Dynamic Response of a Steel Catenary Riser in the Touchdown Zone under Pigging Conditions

“…Li and Low [14] studied the effects of the low-frequency motion of ships on the fatigue response of a steel catenary riser at the touchdown point. Guo et al [15] established a hybrid truncated model of a deepwater riser and the reliability of the model was proven by finite element simulation and experimental tests. Shiri [16] investigated the effect of the formation of a seabed trench on the fatigue resistance of steel catenary risers.…”

Two-phase flow induced vibrations in a marine riser conveying a fluid with rectangular pulse train mass

“…Results showed that the lateral vibrations are negligible, and hence, the idea of using planar motion models seems to be a plausible approximation. Furthermore, a number of useful contributions to the analysis and design of marine risers or pipelines are available in the literature published in recent years (Ai et al, 2018;Lou et al, 2017;Park et al, 2015;Yuan et al, 2018;Khan and Ahmad, 2017;Li and Low, 2012;Guo et al, 2013;Gao et al, 2014;Gao et al, 2016;Xu et al, 2017;Bai et al, 2017;Zhang et al, 2015;Ye et al, 2014;Dong et al, 2013;Katifeoglou and Chatjigeorgiou, 2016;Park et al, 2018;Vendhan, 2014;Gu et al, 2017).…”