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1.
在25℃±1℃的空调环境下,用含水率约10%的棉花秆为测量对象进行试验分析,对比物料堆放密度、料层厚度、测量距离与高频电磁波水分测量精度的关系。试验结果表明,测量距离对测量精度的影响最大,测量距离相差20mm,反射电磁波强度相差450%以上,而对堆放密度的影响约为16%。 相似文献
2.
Zhang LiangLiang Song XiaoBin Wu YunFang Zhu ZhengGang Xiao KeJian Lin GuanMing Lin RongSheng 《保鲜与加工》2005,(4):52
Considering the complication of the coefficient of wind-induced vibration for tall buildings,the scale 1:300 model test of Ying Li Building is completed in the second wind tunnel of Beijing University.Based on the calculation and analysis of the test results,the static and dynamic wind pressure acting on the building can be obtained and the value of the coefficient of wind-induced vibration for this tall building can be solved directly,thus a new way is laid for the research of complicated tall buildings. 相似文献
3.
Considering the complicated distribution of wind load on the surface of the tall building, the 1:300 scale model test of YingLi building is completed in the No.2 environment wind tunnel, which belongs to the State Key Lab of Environmental Engineering College, Beijing University. Based on the calculation and analysis of the test results, this paper discusses the coefficient of wind-induced vibration and shape coefficient of wind load , gives the maximum and minimum value of surface wind load, which can be used for the wind resistant design and insure the security of the building under 100 years return period wind load. 相似文献