山肩邦男法在地下连续墙设计中的应用

结合某工程实例,介绍了山肩邦男弹塑性法在地下连续墙设计中的应用,并用等值梁法和理正深基坑支护软件给予了验证,说明山肩邦男弹塑性法在指导工程实践上是值得信赖的一种方法。     

Influence of bending rigidity of submerged vegetation on local flow resistance

The different state of the submerged vegetation has different influences on the flow resistance. This paper explores the relationship between the state and the resistance of an individual submerged vegetation, and the relative bending rigidity of the submerged vegetation is determined by the state of the submerged vegetation. Based on the experimental observations, the state and the resistance of an individual submerged vegetation are analyzed under different inflow conditions. At the same time, the influences of the various submerged vegetations on the flow resistance are discussed under the same inflow conditions. Some interesting relationships are obtained between the flow resistance and the relative bending rigidity of the submerged vegetation, and it is shown that the flow resistance increases with the increase of the relative bending rigidity of the submerged vegetation, and they are positively correlated.     

Study of blends of styrene-butadiene rubber and poly(vinyl chloride): 1. Analysis of bending in the elastic range

The bending behaviour of styrene-butadiene rubber/poly(vinyl chloride) (SBR/PVC) blends has been studied. By solving differential equations and applying an elastic mechanics calculation, we propose a method of determining the deflection of SBR/PVC blends in their elastic range, comparing the calculated results with the experimental data. Factors which influence the deflection of SBR/PVC blends are discussed.     

FACTORS INFLUENCING BENDING RIGIDITY OF SUBMERGED VEGETATION

The bending rigidity of submerged vegetation is closely related with vegetative drag force. This work aims at determining the effects of flow conditions and characteristics of vegetation on the bending rigidity of submerged vegetation. Based on the dimensional analysis method, the factors influencing the bending rigidity of individual submerged vegetation were analyzed. The relationship between the relative bending rigidity and its influencing factors was investigated by experimental observation, and a rela...     

Numerical simulation of critical current performance in Nb3Sn strand subjected to periodic bending deformation

In the ITER Engineering Design Activity (EDA), four NB₃Sn model coils were developed and successfully tested. However, it was revealed that the critical current of the conductor degraded with the increase of electromagnetic force. One of the explanations of this phenomenon is a strand bending caused by enormous electromagnetic force. The authors therefore developed a simulation code using the distributed circuit model to investigate dependency of the critical current performance on the periodic bending deformation. The simulation results were in good agreement with the experiments. The dependence of the critical current on the periodic transverse load, temperature, periodic load pitch, thickness of Ta barrier which prevents Cu stabilizer from being contaminated by Sn, twist pitch of the strand, and RRR of the bronze matrix was investigated using the developed code. The results showed that the critical current degraded less with decreasing the pitch of the transverse load and increasing the Ta barrier thickness. It suggests that the shorter cabling pitch and the larger bending stiffness prevent the critical current degradation. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 171(3): 7–15, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20923     

水轮发电机组轴系统横纵耦合振动研究

本文建立考虑导轴承和推力轴承联合支承作用的水轮发电机组轴系统有限元模型,探讨导轴承动力特性系数随转子横向偏心距、偏位角和推力轴承动特性系数随推力头的轴向扰动以及倾斜参数的非线性变化规律。由此,系统研究了推力轴承动态特性对水轮发电机组轴系统振动特性的影响,分析了轴系统横向和纵向动力特性通过推力轴承的耦合关系和相互影响程度。     

高海拔地区500 kV电缆户外终端用复合空心绝缘子的设计

对高海拔地区500 kV电缆户外终端用复合空心绝缘子进行设计,复合空心绝缘子爬电距离为32000 mm,结构高度为7990 mm.通过材料选择和生产工艺控制,保证复合空心绝缘子的优异性能;弯曲试验破坏值为设计值的1.24倍,验证设计的产品能够承受电缆户外终端运行时的外力影响.