为了防止水轮机飞逸现象的发生，运用动网格和滑移网格技术，对动水关闭状态下的筒阀运动进行了三维非定常数值模拟和水力特性的研究．结果表明，筒阀的表面压力呈不均匀分布，引起的倾覆力矩最大值达2.94×104.N•m。轴向力在筒阀关闭90％时达到峰值，并根据其变化的平稳程度提出了优化的筒阀关闭方式。此外，对筒阀表面的压力脉动进行了频谱分析，表明压力脉动的形成是尾水管涡带振动向上传递的结果．上述水力特性的分析不仅可以预测混流式水轮机的工作状态，而且可以为筒阀运动的执行机构——多液压缸同步运动系统提供理论依据。

In the present paper, numerical simulation about the emergency shut-down water process of cylindrical valve is performed in order to study hydraulic characteristics of three dimensional unsteady flow during runaway protection of cylindrical valve. The curves of the pressure distribution, the axial force exerting on the valve are given with the time passing under various openings. In addition, the pressure fluctuation caused by the unsteady flow of vortex tape through Francis turbine is provided and analyzed, which provides the reference for the installation and maintenance of hydro-generator unit along with the design of multi-cylinder synchronous motion system.

Based on the analysis of opening and closing control manner for ring gate of hydraulic turbine, the electro-hydraulic proportional control system for ring gate of hydraulic turbine was studied. A new control system, which combines mechanics, hydraulics and electrics, was presented. More particularly, the modules of speed control and multi-cylinder synchronous control for the movement of ring gate was designed. The modules include control valve group, flow dividing module consists of flow dividing motors, and oil distributing module. And the ring gate control system principle under different condition was also studied. By the engineering application in Yunnan Honghe Nansha hydropower plant, it was show that all functions and performances of the control system satisfied the designing requirements.

为了满足水轮机筒阀在启闭过程中的多缸同步和速度控制的要求，对筒阀电液同步控制系统中的主要液压部件，如电液比例方向阀、同步液压马达、比例节流阀和非对称液压缸进行动态数学建模分析，给出了水轮机筒阀电液同步控制系统非线性数学模型。针对筒阀在启闭过程中对同步性能和速度控制要求高的特点，提出一种双闭环（同步闭环和速度闭环）综合控制方式，该控制方式内环负反馈用于多缸同步控制，外环负反馈用于多缸速度控制。利用Simulink对系统进行仿真研究，并和试验结果进行了对比．结果表明，该系统和控制方式能满足水轮机筒阀在启闭过程中对速度和同步性能的要求。

提出了一种变步长灰色预测模糊控制算法，该算法根据新陈代谢原理，建立等维新息预测模型，将预测概念扩展为前向和后向预测，并与模糊控制相结合，对电液比例压力控制系统的顶推压力进行控制。该算法不需要被控对象模型结构的先验信息，基于少数据、贫信息，具有在线自适应以及计算量小的特点，满足实时控制的要求。通过对变步长灰色预测模糊控制与PID控制和纯模糊控制进行仿真和试验比较表明，变步长灰色预测模糊控制在不增加超调的情况下减小了响应时间，改善了控制效果。