针对高中压燃气调压器故障案例缺少以及检修过程中难以准确判断故障原因的特点,利用专家先验知识,建立高中压燃气调压器贝叶斯网络故障诊断模型.在该模型基础上,应用最大期望EM算法进行参数学习优化,寻找最优解,最终得到更合理的检修顺序,并与实际案例进行比较验证.结果表明,实际案例故障统计与参数学习后的计算概率总体一致,反映了参数学习优化贝叶斯网络故障诊断模型的正确性.

Carbon trading mechanism is an effective means to control greenhouse gas emissions. This paper focuses on the low-carbon economic operation of the integrated energy system under carbon trading mechanism in China. The integrated energy system includes the energy storage, ground source heat pump, and other equipment. The objective of this paper was to minimize the annual total cost of the system considering the carbon trading cost and study the operation modes under different carbon trading prices by commercial optimization software. The simulation results show the operation modes in summer are changed obviously with the increase of the carbon trading prices, while the operation modes in winter basically are not changed with the fluctuation of the carbon trading prices; under the carbon trading mechanism, the integrated energy system can not only reduce the carbon emissions, but also reduce the annual total cost through carbon trading, which shows its advantages and good development prospect. In addition, the setting of the carbon emission quota has a direct impact on the economy of the enterprises. Furthermore, the ground source heat pump and the electric refrigeration units can stabilize the fluctuation of the equipment output caused by the change of natural gas prices in this integrated energy system.

高速列车制动盘及其散热筋是影响列车提速的关键因素.本文通过SoildWorks,以目前高铁所使用的传统长肋片散热筋为基础设计了两组新型对比散热筋制动盘.再对模型进行传热数值计算,应用FLUENT得到速度场、对流换热系数以及温度场云图.结果 显示,新型散热筋制动盘通风通道气流状态更稳定,空气流速更大,部分散热筋的局部对流换热系数更大,即更有利于整体散热.其中,短肋片散热筋制动盘中的气流流动最稳定且均匀,分散式长方体散热筋制动盘的迎风区域正上方散热筋的局部对流换热系数最大.