| 1. | Method and principle of engineering cost control in lijiaxia hydropower station construction process
李家峡水电站工程建设中工程造价控制的原则和方法 |
| 2. | Quality control in the process of assembling and jointing have interrupted francis turbine at lijiaxia hydropower station
李家峡水电站混流式水轮机分瓣转轮组合与焊接过程中的质量控制 |
| 3. | The optimized results can greatly improve the operating efficiency and states of the units , and the results are usable for the operational personnel
优化结果使电站的效率和机组的运行状态都得到了显著改善，同时结果可作为李家峡水电站运行人员的操作依据。 |
| 4. | With the proposed method , the internal operation of lijiaxia hydropower station is optimized and the optimized load distribution is derived based on three characteristic daily load curves
运用上述方法，分别以3条特征日负荷曲线为依据对李家峡水电站的厂内运行进行了优化，并得到其负荷分配方案。 |
| 5. | The dam protected height is determined as 15m higher above reservoir water level during initial reservoir impounding period in order to preventing surge damage caused by landslide
李家峡水电站坝前号滑坡属有蠕滑活动的老滑坡，体积为1845 104m ~ ，为预防滑坡涌浪危害，初期蓄水期间坝前设防高度15m 。 |
| 6. | In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal , wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station , in which the signal is decomposed into different frequency band , and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source
摘要基于李家峡水电站双排机组振动的现场试验研究，并且针对传统频谱分析方法傅立叶变换( fft )对于非平稳信号已力不从心这一缺陷，利用小波分析方法在时域和频域上同时具有良好的局部化性质，通过对开停机这一典型非平稳过程信号进行小波及小波包分析，将其分解到不同频带内，获取微弱信息和提取优势频率，并对其作振源分析，得出开停机初始时刻因水流不稳均出现强烈的振动现象，且低频段信号能量最大，开停机过程水流脉动压力和尾水涡带摆动是引起定子基础振动的主要原因。 |
| 7. | Based on the real machine test and the analysis on the prototype observation data from lijiaxia hydropower station , the structural vibration characteristics of the power house is analyzed through the comparison made between the results of the measurements on both the operation stability of the hydropower generating units and the vibration of the power house
摘要以李家峡水电站真机试验为背景，在分析原型观测数据的基础上，通过机组运行稳定性测试结果与厂房振动测试结果的对比，得出了厂房结构振动的特有规律。 |
| 8. | The inner - plant economical operation of lijiaxia hydropower station is studied based on the disadvantageous operating mode area of the units determined by school of civil engineering of tianjin university and the actual operating experience of the lijiaxia hydropower station in the last a few years
摘要以天津大学建筑工程学院确定的李家峡水电站机组的不利工况区为依据，以近几年来该水电站的实际运行经验为参考，在综合考虑机组初始运行状态、机组振动特性、机组出力、下泄流量、水库蓄水量和电网负荷平衡等因素的基础上对李家峡水电站的厂内经济运行进行了研究。 |
