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water pressure fluctuation
相关语句
  压强波动
     The Research on Water Pressure Fluctuation and New Method of Absolute Elevation Survey at a Fix Location Underwater
     水下固定点压强波动分析及其绝对高程测量新方法研究
短句来源
     This paper, setting out from traditional wave theory, probed into algebra relationship between magnitude and frequency of water pressure fluctuation at a fixed point and that of the surface wave, present the expression of water depth at the fixed point in terms of fluctuation magnitude at the fixed point and the reference point, verified the correctness of the expression with numerical method by implementing code for electronic computing;
     本文从现有波浪理论出发,对水下固定点压强波动振幅同表面波高及固定点水深的函数关系进行了推导,得出了利用参考点和被测点压强波动振幅实测值计算被测点水深的数值方法,并通过编程计算对有关公式进行了验证;
短句来源
  “water pressure fluctuation”译为未确定词的双语例句
     TROUBLE ANALYSIS AND REMOVING FOR COOLING WATER PRESSURE FLUCTUATION OF MAIN ENGINE
     柴油机冷却水中有油压力波动故障分析与排除
短句来源
     Experimental Study of Measure Decreasing Water Pressure Fluctuation in Hydroturbine Draft Tube on Model Turbine
     降低水轮机尾水管压力脉动措施的模型试验研究
短句来源
     Troubles and Troubleshooting for Cooling Water Pressure Fluctuation of a Ship's Main Engine
     某轮主机冷却水压力波动故障分析及处理
短句来源
     water pressure fluctuation test at different points, for different cavitation sigma, under the samework condition.
     以及在同一工况的不同空化系数下,不同测压点的水压脉动试验;
短句来源
     Cooling water pressure fluctuation may suddenly occur when a certain loading was reached during the high loading operation of main engine for a ship.
     某轮主机进入高负荷运行,达到某一负荷时会突然出现冷却水压力波动。
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  相似匹配句对
     water pressure;
     (3)在振荡腔内的和水楔作用;
     The Intelligent Water Pressure Controller
     智能水压力发生器
短句来源
     and water;
     水分:31。
短句来源
     pressure;
     压力;
短句来源
     in water was for P.R.
     R.
短句来源
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Optimum setting of hydroturbine governor is an interesting problem in practice. This paper presents a method to determine governor setting using the scaled conjugate gradient optimization algorithm. Optimum governor setting problem can be represented mathematically as a problem to find the goal function minima in the parameter space, the state equation of the control system being a constraint. For a typical hydroturbine control system, the state equation, the adjoint system equation and equations for calculating...

Optimum setting of hydroturbine governor is an interesting problem in practice. This paper presents a method to determine governor setting using the scaled conjugate gradient optimization algorithm. Optimum governor setting problem can be represented mathematically as a problem to find the goal function minima in the parameter space, the state equation of the control system being a constraint. For a typical hydroturbine control system, the state equation, the adjoint system equation and equations for calculating gradients have been deduced. Examples show that the scaled conjugate gradient descent method is quite effective and is good in convergency. The optimization processes in different parameter spaces, such as the space of absolute values. the space of inverses and the space of relative values, are investigated, and the parameter space of relative values is recommended for hydroturbine control system. Furthermore it is showed that the coefficient R. considering the water pressure fluctuation in the goal function, has a great influence on the governor optimum setting, and the transient history and the descent rate of the goal function can be used as terminating contition for optimization process.

本文介绍用在参数空间内寻优方法确定水轮机调速器调节参数整定.参数最优整定问题在数学上可以化为以系统状态方程为约束条件,在参数空间内寻求目标函树极小值的问题.对一个典型的水轮机调节系统,本文导出了系统状态方程、伴随方程和梯度方程.算例表明本文建议的方法效率高.收敛性好.作者研究了在参数绝对值空间、倒数空间和相对值空间的寻优情况,建议采用相对值空间寻优.还讨论了估计水压力波动的系数对参数整定和过渡过程形态的影响.建议采用目标函数下降率作为计算终止条件.

The work condition of the hydro-turbine of the Three Gorges is characterzed by large variationin water head and long period operation in points deviated from the optimum zone. This paper introduces theexperiment of flow pattern observation and water pressure fluctuation performed on a model turbine for ThreeGorges Power Station. In the experiment, we have chosen 55 points for varied heads and loads with respect tothe Three Gorges turbine. For these points, following items were performed; observation and...

The work condition of the hydro-turbine of the Three Gorges is characterzed by large variationin water head and long period operation in points deviated from the optimum zone. This paper introduces theexperiment of flow pattern observation and water pressure fluctuation performed on a model turbine for ThreeGorges Power Station. In the experiment, we have chosen 55 points for varied heads and loads with respect tothe Three Gorges turbine. For these points, following items were performed; observation and description ofthe flow pattern of the inlet and outlet edge of the model runner with fiber endoscope and stroboscope under dif-ferent cavitation sigma; water pressure fluctuation test at 8 points arranged along the water passage under theplant sigma; water pressure fluctuation test at different points, for different cavitation sigma, under the samework condition. We also combine the efficiency hillchart with the cavitation critical curve of both pressure andsuction sides of blade inlet edge, critical curves of channel vortex and no-vortex zone. It is the first example inChina.

针对三峡机组运行水头变幅大、机组偏离最优工况运行时间长等特点,在开发的三峡模型水轮机组上进行了流态观测与水压脉动试验.本次试验选取了三峡电站运行范围内不同水头、不同负荷下的55个工况,对该选定工进行了如下工,即利用光导内窥镜和闪光测频仅对模型转轮叶片进出口流态进行了不同空化系数下的观测及描绘;对过流通道上布置的8个水压脉动测点,进行了电站装置空化系数下的水压脉动试验;以及在同一工况的不同空化系数下,不同测压点的水压脉动试验;并将电站装置空化系数下转轮叶片进口正背面空化临界线、转轮内叶道涡临界线、转轮出口无涡区临界线绘于模型综合特性曲线上,这在国内尚属首次.

The vibration of frames and output power caused by water flow often affects the operating of Francis turbine at part load because of the pressure fluctuation in draft tube. The vibration and noise at full load or over full load are increased. These not only cause the difficulty for the operation of generating unit, but also threaten the safe of the generating unit seriously. In case of the performance of the turbine have been fixed and the generator's frequency is unable to be changed, the methods of air admission...

The vibration of frames and output power caused by water flow often affects the operating of Francis turbine at part load because of the pressure fluctuation in draft tube. The vibration and noise at full load or over full load are increased. These not only cause the difficulty for the operation of generating unit, but also threaten the safe of the generating unit seriously. In case of the performance of the turbine have been fixed and the generator's frequency is unable to be changed, the methods of air admission and the guide baffle are unruly adopted to decrdase the water pressure fluctuation in the draft tube. Up till now, it has not ripe experience for use at air admission and guide baffle because of the difference of turbine type and the limits of site conditions. The present writer designed kinds of guide baffles and different positions of air admission to be tested on the Three Gorges model turbine. The model test was carried out at the typical heads of Three Gorges turbine. The influence of efficiency, output, and results of decreasing the pressure fluctuation and frequency performance are showed.

本文介绍了几种布置在尾水管内的导流装置方案和模型试验结果,描述了各种措施对水轮机效率、出力、流量等参数的影响、降低压力脉动幅值的效果和频率特性。

 
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