Global load determination of high-speed wave-piercing catamarans using finite element method and linear least squares ap
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ORIGINAL ARTICLE
Global load determination of high‑speed wave‑piercing catamarans using finite element method and linear least squares applied to sea trial strain measurements Islam Almallah1 · Jason Lavroff1 · Damien S. Holloway1 · Babak Shabani1 · Michael R. Davis1 Received: 4 August 2019 / Accepted: 17 October 2019 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2019
Abstract Twin hull high-speed catamarans encounter a wide range of sea wave loads. This paper studies the full-scale prediction of global loads on a high-speed catamaran using linear regression analysis based on finite element results. Load cases based on Det Norske Veritas rules are applied to a finite element model to derive load–strain transformation. Strain responses are evaluated at 16 different locations on the catamaran finite element model corresponding to the strain gauges positioned on the HSV-2 Swift 98m Incat catamaran during sea trials. A transformation matrix is generated using the concept of ordinary least squares, to convert from strain responses to the equivalent DNV global load cases. This is applied to determine global loads during several sea trial runs in different heading angles and speeds of 10, 20 and 35 knots. These loads then are compared to show each global load severity at specific speed or heading angle. Keywords Wave-piercing catamaran · Global wave loads · Hull monitoring · Finite element method (FEM)
1 Introduction High-speed wave-piercing catamarans encounter various types of loads, ranging from longitudinal bending moments (LBM) to center bow slamming loads. Estimation of the diverse loads acting on these seagoing vessels is the main interest of recent research. Full-scale data are key to a number of design, operational, and research aspects related to high-speed catamarans. Real-time-based stress monitoring has several potential areas of application such as providing data for decision support, for live assistance and short-term route planning, structural condition reports and for supplying feedback to the design process. Most advanced ships have extensive data collection systems useful for continuous monitoring of engine and hull performance, for voyage performance evaluation, etc. Information from these systems is a beneficial source for further development of quasi–static response design methods for future larger ships.
* Islam Almallah [email protected] 1
School of Engineering, University of Tasmania, Private Bag 65, Hobart, TAS, Australia 7001
A combination of scale model strain gauge records and comprehensive finite element analyses (FEA) can be used to address the structural design requirements. For example, a series of tests were undertaken on a surface effect ship (SES) to generate data that assist in determination of the global design loads and for the design loading plan [2]. The strain measurements were collected on the SES at locations where the most important loads have their greatest effects. Fiber optic Bragg strain gauges were attached at a cross-sectio
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