It is common practice to employ direct calculation procedures for spectral based fatigue assessment. Numerical codes are used to compute direct hydrodynamic loads. There are several complexities and nuances associated with application of loads on finite element (FE) model. It is a computationally expensive task especially when a large number of cases need to be analyzed (for e.g. spectral fatigue analysis). The present paper outlines an approach to evaluate the stress transfer function based on the direct application of moments (vertical bending, horizontal bending and torsional moments) computed using a frequency-domain based sea-keeping code. Multi-point constraint (MPC) method is utilized for application of bending moment. The structural responses computed using direct application of the bending moments (Method 1) and the panel pressures (Method 2) are compared. The evaluated stress transfer function is used for spectral fatigue analysis. Overall, the present study provides a methodology for spectral fatigue assessment using direct application of bending moments.
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ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
June 25–30, 2017
Trondheim, Norway
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5766-3
PROCEEDINGS PAPER
Application of Direct Hydrodynamic Loads in Spectral Fatigue Analysis
Yogendra Parihar,
Yogendra Parihar
Indian Register of Shipping, Mumbai, India
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Saikat Dan,
Saikat Dan
Indian Register of Shipping, Mumbai, India
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Karan Doshi,
Karan Doshi
Indian Register of Shipping, Mumbai, India
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Shivaji Ganesan Thirunaavukarasu
Shivaji Ganesan Thirunaavukarasu
Indian Register of Shipping, Mumbai, India
Search for other works by this author on:
Yogendra Parihar
Indian Register of Shipping, Mumbai, India
Saikat Dan
Indian Register of Shipping, Mumbai, India
Karan Doshi
Indian Register of Shipping, Mumbai, India
Shivaji Ganesan Thirunaavukarasu
Indian Register of Shipping, Mumbai, India
Paper No:
OMAE2017-61907, V03BT02A033; 10 pages
Published Online:
September 25, 2017
Citation
Parihar, Y, Dan, S, Doshi, K, & Ganesan Thirunaavukarasu, S. "Application of Direct Hydrodynamic Loads in Spectral Fatigue Analysis." Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. Volume 3B: Structures, Safety and Reliability. Trondheim, Norway. June 25–30, 2017. V03BT02A033. ASME. https://doi.org/10.1115/OMAE2017-61907
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