IEC的风机选型参数估算方法在中国的适用性研究     

黄林宏  宋丽莉  李刚  王丙兰  张永山 《气象》2016,42(12):1522-1530

国际电工委员会编制的《风力发电机组设计要求》(IEC 61400-1)推荐了针对风电机组安全等级评估的极端风速和湍流强度特征值估算方法,因其简单便捷,在风电领域被广泛采用。利用全国风能资源专业观测网的193座测风塔观测数据,对IEC推荐的极端风速计算方法与我国规范推荐的基于极值I型概率分布方法进行比较,发现两种方法计算的193座塔70 m高度层50年一遇10 min平均最大风速,仅有7座测风塔较为一致,差异在±1%;IEC推荐方法的计算结果多数偏小,其中偏小10%以上的测风塔有121座,偏小30%以上的有44座测风塔,而偏大10%以上的只有9座测风塔;IEC方法计算的极值风速大幅度偏小的测风塔主要分布在台风影响的东南沿海地区,偏差较小的测风塔主要分布在西北和华北地形平缓区域,但同时偏大10%以上的测风塔也多分布在这一地区。以目前行业领域普遍采用的以15 m·s~(-1)风速的平均湍流强度作为风电机组选型指标,与严格按照规范,以15 m·s~(-1)风速段所有样本湍流强度的90%分位数处的值作为指标进行风电机组等级确定作对比,发现193座塔中有46座塔的选型是不安全的,甚至相差两个等级。  相似文献   

江苏暴雨概率预报及其业务应用   总被引：1，自引：0，他引：1  

陈圣劼  孙燕  刘安宁  罗兵 《气象科学》2016,36(2):269-274

以未来12~36 h、36~60 h和60~84 h的暴雨预报为目标,利用2011年—2013年夏季6—8月欧洲细网格数值模式预报产品分析了江苏夏季暴雨的可能预报因子。通过对各因子进行相关性、敏感性和代表性分析后,优选了22个对不同强度降水具有较好区分能力的暴雨预报因子。以这些因子为基础建立了一种简单的江苏省暴雨概率预报方法。其预报产品已在江苏省气象业务一体化平台上投入业务使用。该方法在2011—2013年7月,针对提前12 h预报的历史回报试验中,TS技巧评分平均为13.6,明显高于EC细网格24 h降水预报产品(平均TS评分仅为4.5)。在2014年梅汛期的6月25—26日、7月1—2日和7月4—5日三次区域性暴雨个例的预报试验中,提前60、36、12 h的预报效果均较好,其平均TS评分(44.6)也明显高于欧洲细网格数值模式的降水预报(20.4)。  相似文献   

一种多系统组合导航快速选星方法     

马宏阳  程鹏飞  李冉  黄华东 《测绘工程》2016,25(1):59-64

采用多卫星导航系统组合导航,定位精度和系统可靠性会大幅提升,但导航定位运算量也会成倍增长。为解决多系统组合导航定位精度与实时性之间的矛盾,提出一种新的选星方法。新方法不追求最小GDOP值,而是以满足导航定位精度的GDOP值为前提,结合模糊理论中隶属函数的思想,按卫星在星座中均匀分布为原则进行选星。推导伪距测量的误差模型,分析了GDOP与测量误差之间的关系。北斗、GPS和GLONASS三系统组合导航选星实验结果表明,在不超过3次求解GDOP值的情况下,新方法能以不小于98%的概率得到GDOP≤4。  相似文献   

一种优化的公共主影像选取方法     

刘向铜  曹秋香  熊助国  王胜平 《测绘科学》2016,41(11):114-117,188

针对PS-DINSAR技术中公共主影像的选取问题,提出了基于测量平差理论的归化权值和的方法。该方法在综合相关系数方法的基础上,综合考虑了时间基线、有效空间基线和多普勒质心频率差的影响,利用平差的思想进行定权,来选择公共主影像。归化权值和的方法主影像的选择更加合理、可靠。基于ERS-1/2的影像数据进行实验的实验说明:该算法在主影像的选取上更加稳定,数据的统计特性也更优化,对PS公共主影像的优化选择有重要参考价值。  相似文献   

煤矿地质成图中多边形快速生成算法   总被引：1，自引：0，他引：1  

贾庆仁  车德福  修春华 《测绘科学》2016,41(12):70-74

针对煤矿地质成图中左转算法生成多边形在复杂的二维图形条件下应用效率低的问题,该文提出了一种新的基于左转算法的多边形快速选取及自动生成算法,实现了2D图形环境中多边形的快速选取及自动生成。通过在进行多边形选取时的起始点,起始方向的选择和对悬挂点、线进行处理,解决了复杂图形下多边形选取及自动生成过程中存在的重复生成、效率低下和搜索回退问题。基于GeoMS3D实现该算法,实验结果表明:该算法逻辑简单、结构清晰,在实际的应用中表现出了较高的运算效率。  相似文献   

庐枞LZSD-1孔科学钻孔钻头选择与使用     

余善平 《安徽地质》2016,26(1):36-37

受中国地质科学院地质研究所的委托,安徽省地质矿产勘查局313地质队承担《华东庐枞盆地科学钻探选址预研究》3000m科学钻探工程任务,该钻孔为大陆科学钻探选址预研究项目中6个钻孔之一,主要目的是通过钻探揭示和验证与成矿有关的岩体、基底、盖层的空间分布,建立地壳结构模型和异常解释的标尺,为大陆万米钻探提供选址依据。本文主要介绍了在施工过程中的钻头选用情况,仅供同行参考。  相似文献   

A Method for Automatically Selecting Aids to Navigation Based on their Spatial Influence Domains     

Lihua Zhang  Sipeng Li  Shuaidong Jia 《Marine Geodesy》2016,39(3-4):256-270

To address the limitations of manually selecting aids to navigation (AtNs) on charts, a method for automatically selecting AtNs based on their spatial influence domains (SIDs) is proposed. First, the associations between the spatial attributes of an AtN are analyzed. Second, an SID of the AtN is defined, and a model of the SID is constructed based on the associations between the spatial attributes. Third, the importance of the location of the AtN is weighted based on the SID model. Fourth, an algorithm to automatically select AtNs based on the maximum coverage of the SIDS of preselected AtNs is developed. Finally, several AtNs are selected automatically using the algorithm. The experimental results demonstrate that (1) the proposed method can automatically select AtNs and the results comply with the requirements; (2) the automatic selection can eliminate the human-induced errors or the inconsistent results of manual selections from different operators; and (3) the efficiency of the proposed method is higher than that of current manual methods.  相似文献   

Nonparametric Estimation of Undrained Shear Strength for Normally Consolidated Clays     

Iok-Tong Ng  Ka-Veng Yuen  Le Dong 《Marine Georesources & Geotechnology》2016,34(2):127-137

For decades, various well-known empirical correlations have been established and commonly used to estimate the undrained shear strength of normally consolidated clays in geotechnical practice. However, there are still many contradictory cases regarding the validity of these correlations, so their applicability and reliability are questionable. In this study, an extensive geotechnical database for normally consolidated clays has been compiled. Next, a Bayesian nonparametric method is exploited to identify the most critical soil index properties in inferring the undrained shear strength and a new predictive model is proposed. Finally, the performance of the proposed predictive model is assessed and compared with two well-known correlations using an independent testing database. It confirms that the proposed model not only possesses high predictability, but also provides superior performance over other existing empirical correlations.  相似文献   

油铀兼探的找矿思路在松辽盆地的应用——以中央拗陷区南部为例   总被引：1，自引：0，他引：1  

张森  石蕾  鞠楠  苏建伟 《地质与资源》2018,27(3):257-262

以"油铀兼探"的找矿思路,带动松辽盆地中南部开展砂岩型铀矿调查选区及钻探验证工作.将异常强度250 API和450 API确定为划分潜在铀矿孔、潜在铀矿化孔和正常孔的关键技术指标,对中央拗陷区南部1572个钻孔进行异常筛查工作.排查发现潜在铀矿孔362个,潜在铀矿化孔223个.对191号钻孔和36号钻孔进行钻探验证,发现1个工业孔、1个异常孔.认为区内寻找砂岩型铀矿的有利地段为油田区反转构造形成的隆起区边部四方台组河流相砂体,并总结了中央拗陷区南部6种主要控矿因素.  相似文献   

Landfill site selection based on reliability concepts using the DRASTIC method and AHP integrated with GIS – a case study of Bengaluru city,India     

L. G. Santhosh  G. L. Sivakumar Babu 《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2018,12(3):234-252

The selection of landfill sites for municipal solid waste (MSW) disposal involves consideration of geological, hydrological and environmental parameters which exhibit large spatial variability. Therefore, it is necessary to define, to what extent the chosen sites are reliable such that the probability of environmental pollution and health risks to population is minimal. In the present study, groundwater vulnerability to contamination has been assessed using the standard DRASTIC method. The results showed that the study region has 9.45% of very less, 32.94% of less, 25.47% of moderate, 22.79% of high and 9.35% of very high vulnerable zones. The study also revealed that none of the landfills are located in safe zones. This suggests that it requires proper remedial measures to avoid environmental pollution. A landfill site selection process has been carried out using the Analytical Hierarchy Process integrated with Geographical Information System tools. The obtained results showed that only 3.59?km² (0.08%) of the total area is suitable for landfills. The reliability analysis of the site suitability revealed that landfills are located at unreliable locations where the probability of risk to environmental pollution is high. The presented approach assists decision-makers in selecting reliable locations for the safe disposal of MSW.  相似文献