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A NUMERICAL FEASIBILITY STUDY OF A PARAMETRIC ROLL ADVANCE WARNING SYSTEM

机译:参数轧辊超前预警系统的数值可行性研究

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摘要

This work studies the practicality of using finite-time Lya-punov exponents (FTLEs) to detect the inception of parametric resonance for vessels operating in irregular longitudinal seas. Parametrically excited roll motion is modelled as a single degree-of-freedom system, with nonlinear damping and restoring terms. FTLEs are numerically calculated at every integration time step. Using this numerical model of parametric roll and through tracking trends in the FTLE time series behavior, warnings of parametric roll are identified. This work serves as a proof-of-concept of the FTLE technique's viability in detecting parametric resonance. The ultimate aim of the research contained in this paper, along with future work, is the development of a real-time, on-board aid to warn of impending danger allowing for avoidance of severe, even catastrophic, vessel instabilities.
机译:这项工作研究了使用有限时间Lya-punov指数(FTLE)来检测在不规则纵向海中航行的船舶的参数共振的开始的实用性。参数化激发侧倾运动被建模为具有非线性阻尼和恢复项的单自由度系统。 FTLE是在每个积分时间步长上进行数值计算的。使用该参数化滚动数值模型并通过跟踪FTLE时间序列行为的趋势,可以识别出参数化滚动警告。这项工作是FTLE技术在检测参数共振中的可行性的概念证明。本文所包含的研究的最终目的,是与未来的工作一起,开发一种实时的机载辅助装置,以警告即将发生的危险,从而避免发生严重的甚至灾难性的船只不稳定情况。

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