基于H_∞理论的船舶冷却水控制系统的仿真设计

发布时间：2018-03-13 08:52

  本文选题：船舶柴油机　切入点：冷却水　出处：《上海交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：船舶柴油机冷却水温度控制系统是船舶机舱过程控制系统的重要组成部分,是保证船舶动力装置安全可靠运行的重要系统之一。同时,冷却水系统的冷却水温将直接影响主、辅机和机械系统运行效率。为了使缸套冷却水出机温度的控制更加稳定可靠、适应性强,并具有较高的控制精度,需对系统温度控制器的控制方法进行深入研究。目前船舶机舱中的冷却水温度控制系统大多采用常规PID控制,但是由于冷却水温度控制系统是一个回路闭环系统,具有非线性、时变性、大迟延等特点,传统的PID在某些情况下难以达到理想的控制效果。为了提高船舶的管理水平,降低运营成本,提高船舶运营的安全性、可靠性和经济性,在真正意义上实现机舱综合自动化,有必要对先进控制技术在机舱过程控制中的应用进行探索和研究。本文从所建造船舶的柴油机冷却水控制系统着手,研究了船舶柴油机冷却水系统热力学模型和温控系统,对现有船舶所使用的PID温控阀控制进行了分析;同时通过了解鲁棒控制理论,对船舶柴油机冷却水温度控制系统进行了∞H控制器的设计及仿真分析,通过仿真发现在没有参数摄动情况下∞H最优控制器使系统稳定的时间比PID控制器使系统稳定的时间要短,而且振幅小。当模型参数发生较小摄动时,虽然∞H状态反馈控制和PID控制都能使系统稳定,但PID控制明显使系统性能下降,表现在稳定时间变长。当摄动达到一定量时,PID控制系统不再稳定,而∞H状态反馈控制能使系统保持良好的稳定状态。紧接着分析了主机冷却水温度控制系统机械参数在某个范围摄动时系统的输出响应,仿真结果显示∞H控制器都能使系统回到平衡状态,因此∞H控制比PID控制具有更强的鲁棒稳定性和抗干扰能力。
[Abstract]:The cooling water temperature control system of marine diesel engine is an important part of ship engine room process control system and one of the important systems to ensure the safe and reliable operation of marine power plant. At the same time, the cooling water temperature of the cooling water system will directly affect the main body. In order to make the temperature control of the cylinder liner cooling water outlet machine more stable and reliable, strong adaptability, and has a higher control accuracy, It is necessary to study the control method of the system temperature controller. At present, the cooling water temperature control system in ship engine room mostly adopts the conventional PID control, but the cooling water temperature control system is a loop closed loop system, which is nonlinear. In order to improve the management level of the ship, reduce the operating cost and improve the safety, reliability and economy of the ship operation, the traditional PID is difficult to achieve the ideal control effect under some circumstances. It is necessary to explore and study the application of advanced control technology in engine room process control. The thermodynamic model and temperature control system of marine diesel engine cooling water system are studied, and the PID temperature control valve control used in existing ships is analyzed. The design and simulation analysis of 鈭，

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