Combined with the full scale models tested in - situ of prestressed concrete penstock with double circle unbonded strands and single circle bonded strands of xiaolangdi multipurpose dam project of yellow river , the advantages and disadvantages of two different prestressed systems are analyzed , the concrete stress distributions of the prestressed concrete penstock are induced and summarized during the whole tensioning strands stage . the consistence among the test results , the theory calculating and the three dimensional finite element analysis is proved . therefore , the theoretical method of prestressed concrete penstock is feasible 结合黄河小浪底水利枢纽工程在施工现场进行的采用双层双圈环形无粘结预应力钢绞线和单圈有粘结预应力钢绞线对排沙洞衬砌混凝土施加预应力的1 ： 1模型试验，对比分析了两种后张预应力施工体系的优劣，归纳总结了预应力筋束张拉过程中预应力混凝土压力管道结构管壁混凝土的内力分布规律，验证了模型试验实测数据、理论计算和三维有限元分析结果的一致性，确定了预应力混凝土压力管道理论计算方法的可行性。
On the basis of analysing the principle of hydro - turbine governing system , this paper adopts the module modeling method , divides hydro - turbine governing system into several subsystems like penstock , hydro - turbine , generator , governor , models them separately by mechanism , thus the whole system math model is established 本文在分析水轮机调节系统原理的基础上,采用模块化建模方法,把水轮机调节系统划分为压力引水系统、水轮机、发电机、调速器等几个子系统,分别对其进行了机理建模,从而整合起整个系统的数学模型。
Because concrete crack will greatly affect the security of concrete penstock in hydropower station , the paper applies the theory of global optimization method to predict the maximum concrete crack width in steel - lined reinforced concrete penstock and bring forward a predicting model based on the theory of artificial neural network ( ann ) 摘要基于人工神经网络的全局优化方法的基本理论，对钢衬钢筋混凝土压力管道外包混凝土结构裂缝预测进行了研究，提出了基于神经网络的管道混凝土裂缝预测模型。
