超大型双曲面网架吊顶下弦球三维坐标近景摄影测量技术

在首都国际机场T3B新航站楼超大型双曲面网架下弦吊顶工程中,采用全新的近景摄影测量技术进行网架下弦球三维坐标的测量。现场只需布设少量控制点拍摄像片即可,充分发挥了近景摄影测量现场观测时间短、采集信息量大等技术优势,缩短了测量时间。     

谈通信电源与空调及环境集中监控系统的应用

结合城域网通信工程的建设和通信设备的维护管理经验 ,提出了一种适合通信企业城域网动力及环境集中监控的解决方案 ,并就其系统结构、功能设置作了介绍 ,指出该系统的运行有效提高了铁路部门的维护质量和水平     

考虑高斯有色噪声的FOMC-HTLS-Adaline算法在低频振荡模式辨识中的研究

针对广域测量系统的实测信号受高斯色噪声的影响,提出一种利用FOMC-HTLSAdaline进行低频振荡在线辨识的新方法。首先,为抑制高斯色噪声的影响,利用四阶混合累积量的盲高斯性,将四阶混合累积量(FOMC)序列代替实测序列进行低频振荡的辨识。然后,利用HTLS和自适应神经网络算法(Adaline ANN)相结合,估计出低频振荡的频率、衰减因子、幅值和相位。Adaline神经网络的引入解决了四阶混合累积处理后,模式幅值和相位不易确定的难点,同时减少矩阵处理引入的误差累积,提高检测精度。四机两区域系统仿真算例和实测相量测量单元(PMU)算例共同表明,FOMC-HTLS-Adaline算法可以在高斯色噪声环境下,精确地在线辨识系统振荡模式。     

基于极点对称模态分解的混合储能系统容量配置

为给微电网配置合适的储能容量以平抑网内有功功率波动,提出了一种基于极点对称模态分解(extreme-point symmetric mode decomposition,ESM D)的混合储能系统容量配置模型。基于微电网净负荷功率,利用ESM D方法分解为自适应全局均线作为微电网与电网的交换功率,以及低频和高频分量作为蓄电池和超级电容器的平抑目标;为使分解后的各个分量最优,分析了剩余极点个数对全局均线的影响,研究了临界模态的选择原则以得到合适的低频和高频分量;在此基础上,考虑储能设备的运行寿命,建立了包含年投资成本和年运行维护成本的微电网混合储能系统成本模型。仿真实例验证了所述模型的可行性和经济性。     

配电网线路串联调压装置选型研究

本文中作者研究了配电网线路中使用的各类调压装置,得出了调压装置的选型、配置、安装、应具备的性能和开展的试验方法等。     

源荷储一体化的广义灵活电源双层统筹规划

高比例可再生能源电力系统中,逐渐减少的传统机组灵活性资源与增加的灵活性需求之间的矛盾日益严重,开展灵活电源专题规划的必要性日益凸显。基于灵活性供需平衡机理,提出了源荷储一体化的广义灵活电源概念,并建立了含资源投资决策和运行模拟校验的双层统筹规划模型。在证明了规划模型的凸性基础上,基于最大净收益增量比优化目标,设计了两阶段迭代求解优化算法。最后,通过中国北方某大型风电基地实际数据,对基准规划场景进行了评估,分析了系统灵活性缺额问题,并采用所述模型对源荷储资源进行优化规划,讨论了储能和需求侧响应在未来规划中的应用。算例表明,所提出的灵活性协调优化方法能够将灵活性量化评价指标纳入到电力系统规划中,优化得到不同约束阈值下的最优方案,能够快速进行参数灵敏度分析,从而提高优化方案的鲁棒性和适用性。     

Ti6Al4V合金整体叶盘热等静压近净成形研究

本研究结合模具工艺与热等静压方法,整体近净成形出了复杂叶盘零件,并对模具变形、成形精度以及组织性能进行系统分析。结果表明,整体近净成形叶盘相对致密度达到99.5%。SEM结果显示:零件内部为均匀细小的α+β长条状组织,无明显孔隙和裂纹;组织致密,微观组织出现"分层"现象;同炉拉伸件抗拉强度可达920 MPa,性能优于同规模铸件,与锻件性能相当;分析断口微观形貌得出试样为韧性断裂;该方法成形零件材料利用率高,工艺成本低,成形周期较长。本研究为叶盘类零件热等静压近净成形提供了参考依据。     

Combinatorics‐based estimation of reachable states for the system of simple sequential process with resources

The system of simple sequential processes with resources (S³PR) is a class of Petri nets that can model a typical class of resource allocation systems. This paper proposes a method to calculate the number of reachable states of an S³PR. First of all, an upper bound of reachable states of an S³PR can be obtained by combinatorics. The number of unreachable states may be counted in the upper bound because of the existence of shared resources. Hence, the next step is to subtract the number of unreachable states from the upper bound. Here, siphons with two resources derived from resource circuits are used to obtain the number of the unreachable states. The resulting number after subtracting the number of unreachable states from the upper bound is what we are looking for. Finally, example calculations and analyses are conducted to verify the effectiveness of the method. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

石油峰值,EROI值与经济增长关系研究

在能源消费对经济增长显著影响的背景下,本文引入能源投资回报值(EROI)来探讨石油与经济增长的关系,通过研究表明,石油的EROI值与油价呈反向关指数系,而当EROI值下降至10：1以下,两者为非线性关系,且EROI值与石油公司的利润率之间存在可比关系。全球的石油EROI值已降至16:1左右的低水平,对于石油供应短缺的我国而言,EROI值更低至安全警戒线10:1的水平,随着全球石油峰值的临近,中国的经济增长面临着低石油EROI值,石油企业的高成本,国际油价上涨对中国经济增长的冲击作用,对本土石油企业利润的负面影响也会显著扩大。     

Life cycle emissions analysis of two nZEB concepts

The net-zero emissions building (nZEB) performance is investigated for building operation (EO) and embodied emissions in materials (EE) for Norway's cold climate. nZEB concepts for new residential and office buildings are conceived in order to understand the balance and implications between operational and embodied emissions over the building's life. The main drivers for the CO₂ equivalent (CO₂e) emissions are revealed for both building concepts through a detailed emissions calculation. The influence of the CO₂e factor for electricity is emphasized and it is shown to have significant impact on the temporal evolution of the overall CO₂e emissions balance. The results show that the criterion for zero emissions in operation is easily reached for both nZEB concepts (independent of the CO₂e factor considered). Embodied emissions are significant compared to operational emissions. It was found that an overall emissions balance including both operational and embodied energy is difficult to reach and would be unobtainable in a scenario of low carbon electricity from the grid. In this particular scenario, the net balance of emissions alone is nonetheless not a sufficient performance indicator for nZEB.