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1.
通过试验手段对受冲击后的变压器内部线圈绕组受损情况进行检测,对于正确引导变压器的检修,有效地减少设备停电时间具有极其重要的现实意义。同时,对于变压器的检测提供可行的变压器测试方法,以及判断变压器是否适合重新投入运行、投入后是否存在事故隐患。 相似文献
2.
传统的大坝变形方法主要是基于大量数据统计分析得到,而大量数据的获得显得异常困难,同时变量与变量之间会存在相关性,针对此,本文将主成分分析引入到大坝变形分析的数据预处理中,利用该方法对变形分析的因子进行分析,使得这些因子之间不存在相关性,同时又保持原有的信息要素,再将这些变量作为大坝的影响因子。利用经过主成分分析的因子对大坝变形进行分析的过程中,保证了分析的准确性,同时又提高了分析效率。 相似文献
3.
由于天线结构局部变形并出现凹区,造成口径场产生畸变,从而导致了天线旁瓣性能下降。文章以某车载雷达天线为例,根据其在微波暗室的测试结果以及天线方向图与其口径场之间的关系,通过理论分析,探讨口径场分布影响天线旁瓣性能的主要机理。 相似文献
4.
结合施工经验,分析了混合结构中墙体温度裂缝、收缩裂缝的成因,提出了预防措施,并举例验证了其可行性。 相似文献
5.
通过对大量的圆锥重型（N63.5）动力触探测试数据的分析、整理和解析,很好地确定了碎石土的密实度、承载力及变形模量,利用圆锥重型（N63．5）动力触探曲线进行力学分层、确定单桩承载力,以更好地进行地基检验和确定地基持力层。 相似文献
6.
对影响薄壁件内孔的加工精度的因素进行了分析,找出了主要的影响因素,并从工艺上采取有效的改进措施,解决了薄壁件内孔加工误差大的难题,从而提高了薄壁件内孔的加工精度. 相似文献
7.
祖艳 《阜阳师范学院学报(社会科学版)》2010,(6):46-48
异化是佩列文小说中一个很重要的主题,佩列文在他的作品中通过人的变形,俄罗斯知识分子的异化和其他各种异化现象来说明解体后的俄罗斯人与人之间关系的异化和人与自我关系的异化,向我们展示了新时期人与人之间疏远、陌生的社会关系,人的异化、虚无的精神状态以及苏联社会现实世界的破碎性和虚幻性。 相似文献
8.
We report an experimental investigation on the impact of the freezing rate on the cryo-deformation and cryo-damage of cementitious materials. Saturated, dried and air-entrained mortar specimens are subjected to laboratory freeze-thaw cycles under three freezing rates without moisture exchange with the environment. In addition to basic mechanical properties and pore distribution, the measurement is also effectuated for freezing expansion, residual deformation of the specimens in each cycle. From the results it is observed that a high freezing rate does augment the freezing expansion of material while the cryo-damage is more important for a low freezing rate. Accordingly, both the freezing rate and freezing duration should be taken into account for the cyro-damage extent of cementitious materials. 相似文献
9.
An experimental investigation is performed on side wall deformation at the pendant convective pass （PCP） in a 300 MW and a 600 MW utility boiler. The temperature distributions are measured on the side wall areas of the water-cooled wall, the PCP and the horizontal convective pass （HCP） in the two utility boilers. These experiments show that there are great temperature differences in the side wall areas during the startup process in both utility boilers. These temperature differences can reach 80-150 ~C with the side wall temperature in the PCP area higher than those in the water-cooled wall and the HCP. The highest temperature in the PCP is close to the flue gas side temperature at the same position in the horizontal flue gas pass. Thermal stress analyses are conducted in the side wall areas in the water-cooled wall, the PCP and the HCP with the software ANSYS. The results show that, at great temperature differences, the PCP side wall undergoes negative thermal stresses that exceed the yield strength causing deformation in the PCP side wall. 相似文献
10.
SINGH Bhupinder SINGH S.P KAUSHIK S.K. 《浙江大学学报(A卷英文版)》2007,8(2):257-263
INTRODUCTION Finite Element (FE) procedures are at present widely used in engineering modelling and analysis and employed extensively in the analysis of solids and structures and heat transfer and fluids (Bathe, 1996). The essence of FE solution of an engineering problem is that a set of governing algebraic equations is es-tablished which are then solved with the help of a digital computer. The first practical FE procedures were employed in linear analysis of solids and struc-tures (B… 相似文献