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Linearisation of a ship propulsion system model

机译：船舶推进系统模型的线性化

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The understanding, modelling and analysis of the behaviour of a non-linear ship propulsion plant are of great importance for conceptual system design, component selection, selection of control strategy and for propulsion control system tuning. Conceptual propulsion system design activities, such as deciding the combinator curve, require a relatively simple steady state simulation model, while propulsion controller design and tuning requires a non-linear time domain simulation model which captures the intricacies of the propulsion plant. In this paper a linearised model of the uncontrolled ship propulsion system is derived which can be used for analysis of propulsion system behaviour in waves and for initial controller design and tuning. Furthermore a thorough analysis is made of the conditions under which local instability of the system can occur. In a follow up paper the linearised model is extended and verified by means of comparison with a non-linear model. There it is furthermore used to investigate the effect of engine governor settings on a propulsion plant when sailing in waves at different encounter frequencies. The authors believe that, due to its transparency and clear link to well known parameters and variables, the linearised core propulsion system model as derived in this paper should appeal to marine system engineers, control engineers and hydrodynamicists alike. The linearised model should however not be seen as the replacement for a non-linear model, but rather as an additional tool that can be used.
机译：对非线性船舶推进装置的行为的理解，建模和分析对于概念性系统设计，组件选择，控制策略的选择以及推进控制系统的调整非常重要。概念性推进系统设计活动（例如确定组合曲线）需要相对简单的稳态仿真模型，而推进控制器的设计和调整则需要非线性时域仿真模型，以捕获推进装置的复杂性。在本文中，推导了不受控制的船舶推进系统的线性化模型，该模型可用于分析波浪中的推进系统行为，以及用于初始控制器设计和调试。此外，对可能发生系统局部不稳定的条件进行了全面分析。在后续论文中，通过与非线性模型的比较，扩展并验证了线性化模型。此外，它还用于研究在不同遭遇频率的波浪中航行时，发动机调速器设置对推进装置的影响。作者认为，由于其透明性以及与众所周知的参数和变量的明确联系，本文得出的线性堆芯推进系统模型应该吸引船舶系统工程师，控制工程师和流体力学专家。但是，不应将线性化模型视为非线性模型的替代品，而应视为可以使用的附加工具。

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