【作者】 王明迪；

【导师】 李建勋； 周庆元；

【作者基本信息】 上海交通大学 ， 控制工程， 2009， 硕士

【摘要】 液体火箭发动机贮箱增压系统是试验台的重要组成部分,其作用是为推进剂贮箱增压,以便推动推进剂以一定的压力进入发动机燃烧室,满足发动机泵入口压力要求,从而验证发动机是否达到设计的性能指标。贮箱增压是一个非常复杂的工作过程,为减轻操作人员的劳动强度,提高发动机入口压力调节的可靠性和稳定性,降低试验成本,提高试验效率,需要对贮箱增压进行自动化设计。第一章绪论部分首先对贮箱增压系统的概念和用途进行介绍,详细分析了火箭发动机试验平台对贮箱增压系统的指标要求,同时回顾了国内外贮箱增压系统的研究和使用情况。第二章详细介绍了贮箱增压系统的系统组成和工作原理,针对每个分系统或部件,详细描述了它们的功能和性能指标,最后概述了本课题的主要研究内容。第三章首先利用一维可压缩流的有限元状态空间模型,建立液体火箭发动机试验台贮箱的数学模型。然后基于小扰动线性化理论,对数学模型进行线性化,获得简化的被控对象数学模型。最后计算出被控对象输入输出之间的传递函数。第四章首先根据获得的贮箱压力控制系统数学模型,设计了常规PID控制器。由于常规PID控制器依赖于精确的数学模型,难以获得满意的响应结果,本文又在常规PID控制算法的基础上进行了改进。将模糊控制器与PID控制器结合在一起,利用模糊逻辑控制实现PID参数的在线自调整,使控制系统性能得到改善。利用Matlab /simulink软件对贮箱增压过程两种控制方法进行了仿真验证,并对它们的性能进行了仿真比较。第五章详细描述了为验证增压系统模型建立的准确性,检验控制系统设计的有效性而开发的一套模拟火箭发动机试车台贮箱增压系统的试验装置。利用水介质进行了调试试验,最后分析和讨论了该试验装置的测试结果。第六章对本课题的研究内容进行了总结与展望。更多还原

【Abstract】 Tank pressurization system is one important part of a liquid rocket engine test-bed. The tank pressurization system can control the gas quantity into the tank which extrudes the propellant into engine combustion chamber under the required pressure. The process of tank pressurization is rather complex and time-consuming. Hence, a set of automatic tank pressurization equipment is imperative to release workload, improve pressure regulation precision, boost the work efficiency and decrease test cost.In Chapter 1,definition and purpose of a tank pressurization system is introduced. Performance requirements to construct an applicable tank pressurization system are described. The art of the state of the tank pressurization system is also provided in this chapter.In Chapter 2, system configuration and working principle of the tank pressurization system are provided at first. Function and performance index of each component of the system are given. Then, the content of the project is outlined.In Chapter 3, a mathematic model for tank pressurization system of liquid rocket engine test-bed is developed by using the finite elements state-space model theory for one-dimensional compressible fluid flow. Based on the small disturbance linearization method, a simplified control model is obtained and the corresponding input-output transfer function is achieved.In Chapter 4, two control systems are designed based on the conventional PID method and the fuzzy system-enhanced PID method respectively. Using Matlab/Simulink toolbox, the proposed control systems are implemented. Then, simulation results demonstrate their validity.In Chapter 5, a set of tank pressurization system is implemented for a simulated liquid rocket engine test-bed. Several tests are carried out to verify the tank pressurization system by using water medium. Test results are analyzedThe last chapter summarizes the project and provides some future research directions.更多还原