基于系统动力学的LNG船汽轮机系统建模与仿真

Modeling and simulation of LNG ship steam turbine system based on system dynamics

针对经典船舶汽轮机系统动态数学模型表述抽象难懂、内部机理不够直观的缺点,利用系统动力学理论,采用因果关系与存量流量分析方法,从相对宏观角度建立液化天然气(LNG)船舶汽轮机系统动态调节模型,并进行仿真试验.与经典模型比较结果表明,所建系统动力学模型具有表述简单易懂、繁简适当及精度较高的特点,可为LNG船汽轮机系统的动态特性分析及优化控制等提供一种新思路.

Since the classical regulation dynamic mathematical model of marine steam turbine system is abstract and difficult in understanding,and the internal mechanism of the model is not intuitive,a dynamic model for liquefied natural gas（LNG） ship turbine system is established based on system dynamics using the methods of causal loop analysis and stock flow diagrams,and simulation tests were carried out.Comparison with classical model show that the proposed model has characteristics of ordered texture,conciseness and high accuracy,which is appropriate for the dynamic characteristics analysis and optimized control of LNG ship turbine system.