Data-driven Health Status Prediction of the Hydraulic Turbine Governing System

水轮机调速系统是水轮发电机组的关键控制系统。运用故障树与专家系统相结合的方法对调速系统可能发生的故障进行诊断,并基于历史数据,挖掘与故障相关的可能因素,对专家系统无法解决的故障进行分析,构建了基于数据驱动的水轮机调速系统健康状态预测系统。The hydraulic turbine governing system is the key control system of the hydro-turbine generator unit. In this paper,the fault tree method and the expert system are combined to predict the potential faults of the governing system.Based on the historical data,a data-driven health status prediction system is developed for the hydraulic turbine governing system to detect the possible factors of the faults and analyze the unsolved faults

CO_2-laser micromachining for production of PMMA-based microarrayer

提出利用CO2激光器快速制作微阵列点样芯片。通过测量激光在不同功率下加工小孔或是对同一小孔加工不同次数时所得小孔孔径和深度,以此来确定激光器的各项性能参数。并且测得不同功率的激光穿透小孔以及穿透次数不同所得小孔孔径。最后利用直径约为79μm的10×10阵列式孔道制作微阵列点样芯片,于尼龙膜上点样,所得样点平均直径为200μm,并测得小孔孔径与样点两者相对标准偏差分别为4.3%和7.4%。A new method to produce microarrayer rapidly by CO_2-laser system was presented. The system parameter was assessed of the depth and diameter of laser-ablated hole on the laser beam power and on the number of marks of the beam in the same hole. And the diameters of penetrated holes on the laser beam power and on the number of marks of the beam in the same hole were measured. The microarrayer was produced by the 10×10 array of holes. The diameters of holes were about 79μm. The diameters of spots which were printed on nylon membrane were about 200μm. And the CV of holes and the spots were 4.3% and 7.4%国家自然科学基金(No.20475047)资助项

高压深层裂缝性油气藏中不定常渗流的数值研究

根据实验结果和裂缝性压力敏感地层的特性,建立了适合于不同外边界条件下裂缝性压力敏感地层的不定常渗流模型.推导出了裂缝性压力敏感地层的不定常渗流模型的有限元方程.在对区域进行非结构化网格自动划分的基础上,利用有限元计算方法计算出了无限大地层、圆形有界地层以及线性组合边界地层的裂缝性压力敏感地层的井底压力的理论曲线,并对理论曲线特征进行了分析和对比.确定了压力敏感系数以及有效井径组合参数对理论曲线的影响,得到了确定压力敏感油气藏的地层参数的方法.通过某气田高温高压深层气井的实例分析,得到了较好的分析结果,同时也验证该文所建立的裂缝性压力敏感地层的不定常渗流模型的正确性

一种新的计算天然气偏差因子的方法

对目前国内外使用的天然气偏差因子计算方法进行了分类和评价分析,指出各类方法的优缺点。在此基础上,建立了一种新的偏差因子计算方法,给出了新方法的基本思想、计算方法和计算结果。利用三种方式对计算结果进行了分析对比。对比结果表明:计算结果与Standing-Katz图版的误差趋于0;与目前公认最好的状态方程方法——DAK方法的结果相比,其最大相对误差小于1%。从而验证了该偏差因子计算方法的正确性。新的偏差因子计算方法具有计算速度快、精度高、范围大、计算机操作方便等优点

Numerical Study On Transient Flow In The Deep Naturally Fractured Reservoir With High Pressure

According to the experimental results and the characteristics of the pressure-sensitive fractured formation, a transient flow model is developed for the deep naturally-fractured reservoirs with different outer boundary conditions. The finite element equations for the model are derived. After generating the unstructured grids in the solution regions, the finite element method is used to calculate the pressure type curves for the pressure-sensitive fractured reservoir with different outer boundaries, such as the infinite boundary, circle boundary and combined linear boundaries, and the characteristics of the type curves are comparatively analyzed. The effects on the pressure curves caused by pressure sensitivity module and the effective radius combined parameter are determined, and the method for calculating the pressure-sensitive reservoir parameters is introduced. By analyzing the real field case in the high temperature and pressure reservoir, the perfect results show that the transient flow model for the pressure-sensitive fractured reservoir in this paper is correct