Stochastic averaging for estimating a ship roll in random longitudinal or oblique waves |
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| Institution: | 1. Department of Mechanical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark;2. Centre for Autonomous Marine Operations and Systems (AMOS), Dept. of Marine Tech., NTNU, Trondheim, Norway;1. School of Naval Architect, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Shanghai Rules and Research Institute, China Classification Society, Shanghai 200135, China;3. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. China Ship Scientific Research Center, Wuxi 214082, China |
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| Abstract: | In this work, the C11 container ship is taken as an example to analyze its rolling performances in random longitudinal or oblique waves. Firstly, a dynamic model of C11 roll in random waves is improved, and it is verified by the model test and numerical simulation. Mathematically, this dynamic model is a one-dimensional stochastic differential equation with random parametric (and external) excitation. Secondly, an enhanced stochastic averaging method is proposed to solve this stochastic differential equation. The validity of the solutions was verified by Monte Carlo simulation. At last, the probabilistic characteristics of the extreme rolling response were investigated based on the calculated results using enhanced stochastic averaging method. According to the analysis, some advices for ship's manoeuvring can be put forward when ships are navigating in random waves. |
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| Keywords: | Ship random roll Random waves Stochastic averaging Extreme response |
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