Results 1 to 10 of about 490 (146)
全球能源互联网, 2018 对某1000 kV输电线路工程四回路输电塔的横担模型进行了高频天平测力风洞试验，得到了5个横担的体型系数，研究了横担体型系数随风向角的变化规律，并将试验结果与国内外规范进行了对比。试验结果表明，横担顺线路体型系数随风向角增大而增大，在85º～90º时达到最大值。试验结果大于GB50665—2011规范取值，除了第四个横担，其他横担体型系数试验结果与IEC60826、ASCE74、JEC-127-1979和BS EN50341-1:2012规范取值接近，可为国内规范中横担的体型系数取值提供补充。
何清清, 谢强, 田雷
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A Study on Solar Photovoltaic Array Surface Morphology Variation in Sandy Area Based on Wind Tunnel Test [PDF]
, 2022 [Objective] The surface morphology changes and its relation with wind environment under wind regime disturbance by a solar photovoltaic array in a sandy area of the middle part of Kubuqi Desert, in order to provide a theoretical basis for determining a ...
Dang Xiaohong +5 more
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Aerodynamic admittance of along-wind loads on tall buildings [PDF]
, 2017 高层建筑顺风向的脉动风荷载通常是基于准定常假设,由来流风速的功率谱密度函数和相干函数求得,其中风荷载和风速功率谱密度对气动导纳函数影响较大。依据; 10个典型高层建筑模型的同步测压风洞试验数据,对高层建筑各层高度处顺风向荷载的功率谱密度函数和气动导纳函数的特性进行分析,提出了顺风向荷载气动导; 纳函数的表达式,并针对公式中的具体参数进行了拟合。采用该表达式对一栋实际高层建筑的顺风向风致动态响应进行计算,并与其模型的试验结果进行对比。结果; 表明:高层建筑顺风向荷载的气动导纳曲线沿高度变化不大 ...
张建国, 顾明
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Feasibility analysis of WDPR support cone model application in hypersonic wind tunnel [PDF]
, 2017 绳牵引并联机构(WDPR)能够有效调整飞行器模型的位姿,为扩展风洞试验能力提供了一种新型支撑手段,具有很大的应用潜力。本文将对其在高超声速风洞中; 应用所涉及的稳定性与气动干扰问题进行研究。以10°尖锥标椎模型为例,设计了8绳牵引的并联支撑系统,可以通过调整绳长控制模型的位置和姿态。模拟了气; 动载荷作用下支撑系统的稳定性,优化牵引绳直径。基于构建的三维模型,借助CFD软件进行气动计算,包括马赫数为7.8时,不同迎角下绳牵引并联支撑锥体; 模型的气动力系数,通过与无绳支撑结果以及文献试验数据进行比较 ...
冀洋锋 +5 more
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Preliminary study of regulation technology of wind field distribution on QTT site based on test of equivalent wind field [PDF]
, 2019 The effect of wind gust on the large reflector antenna is one of the main factors that can affect the antenna performance and therefore, this effect must be minimized to meet the strict performance requirement in the world largest steerable telescope ...
Du, Biao +11 more
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Research Progress of Galloping of Overhead Iced Transmission Lines [PDF]
, 2023 [Introduction] The galloping of transmission lines will lead to trip, worn hardware, broken insulator string, damaged tower-arm and other accidents. In serious cases, collapsed tower accidents may occur.
Guangyun MIN, Xiaohui LIU, Xin ZHAO
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Effects of Artificial Cyanobacterial Crust on Soil Wind Erosion Control in Arid Regions [PDF]
, 2023 [Objective] The influence factors of artificial cyanobacterial crust on soil threshold wind velocity and wind erosion rate, and the effects of wind erosion prevention and control were analyzed, and the feasibility of using artificial cyanobacterial crust
Gao Liqian, Huang Minghui, Zhao Yunge
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基于RBF神经网络补偿的一种绳牵引并联机器人支撑系统的力/位混合控制 [PDF]
, 2018 为了保证用于风洞试验的绳牵引并联机器人支撑系统(Wire-Driven Parallel Robot Support System WDPRSS)的末端执行精度,设计了一种采用Hamilton-Jacobi Inequality(HJI)定理并基于RBF神经网络补偿的力/位混合控制。通过对WDPRSS的动力学建模分析,选择以位姿作为变量建立WDPRSS的整体动力学方程。将所设计的力/位混合控制代入到整体动力学方程中得误差闭环系统,对闭环系统进行稳定性分析,结果证明WDPRSS是趋于渐进稳定特性的 ...
刘骏 +4 more
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Application of Ultrasonic Chain Pin Sensor for Soil Wind Erosion Monitoring [PDF]
, 2022 [Objective] The application of ultrasonic chain pin sensor in soil wind erosion was studied by experiment to verify the monitoring accuracy and reliability of the equipment for wind erosion in order to provides a theoretical basis for the improvement and
Lei Lei +3 more
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Shuitu Baochi Xuebao, 2020 东北黑土区农田晚春冻融作用通过改变土壤物理性质而对风蚀作用有重要影响。基于室内冻融模拟试验与风洞试验，分析了东北典型黑土区前期冻融作用对土壤风蚀的影响。试验处理包括3个土壤含水量（16.5%，24.8%，33.0%）、3个风速（9，12，15 m/s）、1次冻融循环。试验过程是先将装有不同含水量土壤的试验土槽进行冻融循环模拟，然后将冻融后的土壤在室温下自然风干（至其土壤含水量为6.0%~7.0%）后进行风洞试验。结果表明：前期土壤冻融作用显著增加了风蚀量和输沙量 ...
王一菲 +6 more
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