Results 81 to 90 of about 1,917 (152)
Gaoya dianqi, 2003 通过模拟计算了产生30kV,1.2/50μs冲击电压和15hA,8/20μs冲击电流的组合波试验装置的元件参数,探讨了惜助计算机工具模拟试验过程,并依据模拟结果在高压实验室建立了试验回路。
臧绪运, 孙伟, 赵刚, 陈文针
doaj
Trial‑Manufacture and Experimental Study of Particle Damping Boring Bar for Deep Hole Boring of 7075 Aluminum Alloy [PDF]
7075 aluminum alloy is often used as an important load-bearing structure in aircraft industry due to its superior mechanical properties. During the process of deep hole boring， the boring bar is prone to vibrate because of its limited machining space ...
DONG Qingyun, HAN Jianxin, HUANG Yi
core +1 more source
Dianci bileiqi, 1992 在研制和设计保护电器的时候,关于其保护特性和通流容量的稳定性方面是可信的信息,可能是来自该电器在实际网路上进行的试验或在试验室条件下进行的工作性试验.对于金属氧化物避雷器,IEC刊物（草案）推荐进行下列各种工作试验:标称冲击电流,短时间大幅值冲击电流,各种不同波长的冲击电流与施加各种不同幅值工频电压的联合作用.文章叙述了可以满足IEC草案规定的金属氧化物避雷器大幅值冲击电流工作试验的全部要求的试验设备,列出了O?H—110试样的试验结果及其采用方法的评价 ...
doaj
Estimation of Dynamic Stiffness and Analysis of Error Source of Spacer Grid for Pressurized Water Reactor Fuel Assembly [PDF]
Fuel assemblies are core components in pressurized water reactor (PWR), in which spacer grids serve as essential structural elements to support fuel rods, maintain fuel rod spacing, mix coolant, and resist external loads.
ZHOU Ding1, 2, HUANG Congcai2, LI Tianyong2, QIAO Hongwei2, CUI Yihang2, ZHAO Xiangji2, MA Jianzhong2, SUN Lei2
core +1 more source
Dianci bileiqi, 2013 基于盘型悬式玻璃绝缘子在经受空气中冲击击穿试验和实际在线路上运行时所表现的特性,分析了玻璃绝缘子在抽样试验中经受冲击击穿试验时有损坏的原因,并对绝缘子在制造工艺和国标（GB/T 20642-2006）中可能存在的问题提出了商榷意见。指出稳定绝缘子在制造过程中的管理水平、正确选择较大尺寸产品的试验电压和在标准范围内尽可能缩短冲击的波前时间,是可采取的有效对策。
闵健
doaj
, 1984 当前世界范围的能源紧张和金属材料的快速消耗,促使人们对复合材料产生越来越大的兴趣。在航空与宇航领域里,对碳、硼等高性能纤维复合材料的需求量日趋增加;在船舶、汽车、电气零件、民用设施等方面,纤维增强塑料的用量也很大 ...
张双寅
core
Analysis of soil cushion buffering characteristic for rockfall impact force through discrete element numerical simulation [PDF]
Rock sheds is one of the main engineering solutions for mitigating rockfall disaster in the mountainous regions of western China. Typically, the roof of a rock shed is covered with a soil cushion composed of sand or gravel.
Fabin YAN +6 more
core +1 more source
Research on design optimization of oil and gas pipelines leveraging X80 tee and additive manufacturing technology [PDF]
Objective The traditional hot-extruded tees are manufactured through a complex process and exhibit unstable organizational properties and quality levels.
Ye TIAN
core +1 more source
Dianci bileiqi, 2012 基于GB18802.1-2011,对MOV进行8/20μs冲击电流试验时,经常发现当冲击电流归零后,残压或者持续一段时间归零（正峰）、或者过零（反峰）后再归零。为解释这一普遍存在的试验现象,对冲击试验回路在带负载情况下进行了等效电路分析,并利用试验得出:由于冲击后主回路开关不能迅速切断回路,使电容器上残余电荷形成的电压加在试品上导致电流过零后还存在残压,其值等于电容器残余电荷形成的电压,持续时间为开关关断所用时间。
赵佳欢 +4 more
doaj