水轮机

Simulation results show the advantages of short settling time, small overshoot and strong robustness.

并探讨了其在水轮机调速系统和发电机励磁控制系统中的具体实现。

Many companies and research organizations have already begun to develop the hydraulic turbine governor on the basis of PCC.

本文所做的研究是在PCC上开发水轮机调速器的控制软件。

In this paper the problem of rationa1 regulation in penstock of the mixed- flow water turbine is studied, comparative1y simple and exact computation formulas are given, together with concrete examples.

本文研究了混流式水轮机管道水锤压力的合理关闭规律问题，给出了较为严格的、简便的计算公式；并附有实例。

A new scheme of frequency measurement in hydro-turbine governor is introduced in this paper. Instead using single-chip computer or P LC high-speed count module, it utilizes the interrupt functions and high-speed counter in the PLC base unit and peripheral circuit. With enhanced reliability and reduced cost, the governor designed in this scheme shows good application pr ospect.

介绍一种在水轮机调速器中实现频率测量的新方案，该方案不需要单片机，也不需PLC的高速计数模块，它是利用PLC基本单元的中断功能、内藏的高速计数器及相应的外围电路得以实现，从而既提高了调速器的可靠性，又降低了其成本。

Note: In particular, a pondage station permits the cumulative water flows to be stored during periods of low load to enable the turbine to operate during high load periods on the same or following days.

由径流量向水库蓄水时间最多不超过几个星期的水电站。注：特别是低负荷期间，径流量集聚在水库中，以便水轮机在日后的高负荷期间或随后的数天内能够运行。

A new circuit used for the grating torque sensor of hydraulic turbine's principal axis system is designed.

针对水轮机主轴扭矩检测系统中的光栅扭矩传感器，设计了一种新型电路。

The calculation results show that runner frequency of the turbine is reduced in certain degree under the effect of water pressure and viscous force, and the mode is changed too.

通过计算表明在水压载荷和黏性载荷的作用下，水轮机的转轮频率存在一定程度的下降，模态发生了变化。

This thesis aims at developing a model and calculation method of rigidity, strength and vibration of the blade.

本文目的就是要建立一套适合于水轮机转轮叶片刚强度与振动的分析模型和计算方法。

The rudimental structure, function and teaching method of manipulator system for repairing hydraulic turbine is introduced.

介绍了水轮机导叶修复用机械手系统的基本结构、功能及示教方法。

The calculation of the rotordynamic coefficients of a multistepped annular seal in hydraulic turbines is discussed in this paper. Based on the Hirs' turbulence lubrication theory and the bulk flow model, the governing equations for the flow in the seal are developed by using the Moody's friction equations. The governing equations are perturbed when the rotor and the stator are coaxial. The Runge Kutta integration method and the Newton Raphson iteration method are used to solve the perturbation equations....

本文首先在Hirs紊流润滑理论的基础上，采用体积流动模型及Moody摩擦方程建立起阶梯口环水封中流体流动的控制方程，将各个方程在转子与定子同心处进行摄动，采用Runge－Kuta积分法及迭代过程求解摄动方程，建立起水轮机阶梯式口环水封的转子动力特性系数的计算方法，为水轮发电机组轴系的动力学分析提供了必要的理论基础。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。