基于气测全烃影响机理的气测全烃修正方法

在井场生产作业过程中,气测全烃参数所受主客观影响因素较多,测量值在实际应用中误差很大,导致其在解释评价中功用受限。为了解决这个问题,提高气测全烃参数预测的可靠性,针对不同气体来源的各种影响因素,分析气测全烃的主要影响因素及其与气测全烃之间的相互关系,建立了气测全烃修正方法和数据点优化方法,并基于实用性对其进行简化,最终形成一套适应性广泛、操作简便的气测全烃修正方法。所建立的方法在涪陵页岩气主体区取得了很好的应用效果,为评价储集层含气性提供了新的方法和手段。     

“W”火焰锅炉燃烧系统改造在300MW机组的应用

结合燃烧理论的基础知识和现场改造工作的实践经验总结,对“W”型火焰锅炉燃烧系统的改造进行分析和实际探讨,这对于提高锅炉效率有一定的现实意义。     

电力市场代理交易目标客户群体分析

为协助售电公司提升市场化售电服务质量,利用支持向量机-混沌时间序列模型对陕西省可参与市场化售电的用户用电量进行动态预测.然后根据对未参与市场化用户的用电预测偏差和成本降幅测算结果,对未参与市场化售电的用户进行分析与评估,并给出售电公司开展售电业务的代理建议.最后根据考核要求,利用已参与市场化客户的动态预测偏差值来进一步对客户是否被考核进行预警分析.初步应用结果表明,售电公司从这2方面开展代理业务已取得较好成果,可进一步深化应用.     

基于倒频谱的水电机组状态数据诊断方法研究

针对水电机组监测数据的特点,引入倒频谱分析方法,简要介绍了倒频谱的两种定义和信号分离方法,并设计了倒频谱算法的实现过程,最后以水电机组某故障特征数据开展倒频谱分析.结果表明,倒频谱方法是在复杂干扰背景下获取有用信息的一种有效手段,对于水电机组故障诊断从定性到定位的转变,具有一定的研究和应用价值.     

Sniffer-Net: quantitative evaluation of smoke in the wild based on spatial–temporal motion spectrum

Smoke detection plays an essential role in the wild video surveillance systems for abnormal events warning. In this paper, we introduced a dedicated neural network structure named Sniffer-Net to simultaneously extract smoke dynamic feature robustly and evaluate the smoke concentration accurately. Firstly, we utilize an improved LiteFlowNet to estimate the global optical flow from image sequence. Meanwhile, a Marr–Hildreth method is brought up and fused into this network to distinguish and eliminate occluded regions from global flow map. Then, an evaluation module based on Context-Encoder network is put forward specially to quantify smoke concentration levels. This network, following the improved LiteFlowNet, is modified through replacing the loss function and removing the multiscale scheme and trained to infer approximate smoke optical flow behind occlusion regions. Starting from the statistical view, the irregular RGB/HSV feature spaces are converted into a specific quantitative evaluation space. As a result, the whole evaluation system is responsible to transform the distribution of irregular smoke motion feature into a quantified form of representation. In turn, this transformation endows the system with a novel numerical standard for smoke concentration evaluation. Finally, an accuracy assessment method is applied to compare the results of detected smoke concentration with the human experience prior model, which feedback the accuracy and false detection rate of system algorithm. In the experiments of five smoke datasets, our proposed smoke detection approach is superior to other state-of-the-art methods, and concentration algorithm achieves the satisfactory performance of 97.3% accuracy on some specialized dataset.

     

一种电动自行车充电桩的设计

针对目前电动自行车大量增加,同时充电问题困难的情况,设计了一种小区用刷卡付费电动车充电桩,可以解决小区内私拉乱接电线为电动车充电的问题。充电桩收费采用M1卡进行结算,通过时间控制继电器的通断实现电动车的充电,按照充电时间进行收费。充电剩余时间采用LED液晶显示,每台充电桩可以控制10路负荷的通断。该充电桩还能够对电动车充电负荷进行检测,当负荷超过限值时断开负载,保证电动车充电故障时能隔离故障。实践证明,充电桩能够正常付费工作,方便地解决了城市小区居民对电动车充电。     

数据同化方法在曲面重构中的应用

数据同化方法是气象、海洋进行数值预报的主要方法,四维数据同化的提出提高了其预报的准确性。四维数据同化的实质就是由大量观测值去确定出这些观测值所决定的曲面,而曲面重构也是依据测量所获得的大规模数据点重构实物的曲面模型。因此,本文提出了将数据同化方法应用于曲面重构的设想,文中分别介绍了如何用迭代寻优法进行网格优化和变分伴随同化法进行曲面重构。试验结果表明:优化后的三角网格更趋于正三角形,同化后的曲面逼近精度明显提高,达到了提高重构曲面与实物一致性的目的。     

Numerical simulation of a novel microfluidic electroosmotic micromixer with Cantor fractal structure

In this paper, we design a novel low voltage of electroosmotic micromixer with fractal structure. Because of the influence of high voltage on electrode and solution, we propose an electroosmotic micromixer of low voltage. In order to optimize the electrode position, we design the Cantor fractal according to Cantor principle, and arrange the electrode pairs on the fractal. Then we study the mixing effect of the electrode pairs length on the mixing performance, the effect of the electrode position and the effect of fractal electrode group spacing on the mixing efficiency. When the electroosmotic micromixer has three electrode groups at alternating voltage of 5 V and alternating frequency of 8 Hz, the best mixing efficiency can reach 95.2% in one second. We call this micromixer Cantor fractal electroosmotic micromixer (CFEM). At the same Re, the mixing efficiency of CFEM is higher than the electrodeless micromixer 50%.

     

基于坝—岩基—水耦合解析的坝肩动力稳定分析

为了模拟三维状态下坝、岩基、库水的动力相互作用机理,研究提出了基于坝—岩基—水耦合的三维有限元分析方法。通过分析坝—岩基—水耦合动力相互作用理论,给出了坝—库水体的耦合条件、坝—岩基—库水的边界条件以及地震时粘性边界的分析方法。以某拱坝工程为实例,应用耦合三维有限元方法计算了拱坝及滑裂面应力分布,采用有限单元法和刚体极限平衡法,计算了坝肩各处的抗滑稳定安全系数。结果表明:最大拱向应力、梁向应力均出现在下游面,分别为1.43 MPa、1.50 MPa,在材料可承受的范围内。通过有限元法计算得到的拱坝坝肩岩体抗滑稳定安全系数为2.78~3.23,通过刚体极限平衡法计算的抗滑稳定安全系数为2.89~3.43,两者相差很小,说明该计算方法是有效的。研究成果可为拱坝坝肩抗滑稳定分析提供参考。     

伸缩缝防渗结构聚脲基涂层剥离破坏研究

水工建筑物普遍存在伸缩缝渗漏破坏问题,其破坏机理亟待研究。本文基于南水北调工程实际背景,引入损伤断裂力学理论,建立了内聚力单元的有限元仿真模型,并根据防渗涂层剥离试验的反向压力-位移变形数据,给出了适合于聚脲基复合防渗体系黏接层内聚力单元的刚度和黏聚系数等参数。计算了剥离反向压力,分析了聚脲基防渗涂层厚度对剥离临界反向压力的影响,以及水压力和伸缩缝扩展位移工况下,涂层厚度、涂层弹性模量和内聚力单元切向黏接强度对涂层剥离破坏长度的影响。数值计算结果表明,剥离反向压力与剥离试验的结果基本一致,说明内聚力模型参数的合理,能够有效模拟聚脲基复合防渗涂层剥离破坏的力学机理。同时,水压力和伸缩缝扩展位移工况下的分析结果,也说明了建立的聚脲基防渗涂层破坏分析方法对伸缩缝的防渗设计具有定量的指导作用。