GVPI定子绕组中半硬态线棒替换故障线棒的方法研究

文章针对GVPI定子绕组维修,提出在保留非故障线棒的条件下,采用半硬态线棒作为新线棒,替换故障线棒的方法。研究了半硬态定子线棒结构及制造方法,并验证了该结构线棒嵌线的可行性及绝缘性能。试验结果表明,半硬态线棒绝缘结构合理,能满足嵌线要求,且绝缘性能优异。

不同处理态的高速列车用TP2铜导体腐蚀行为研究

为了研究高速列车车顶用TP2铜导体在露天环境下服役的腐蚀行为,将硬态和半硬态2种TP2铜导体在大气环境下分别置于10%盐酸溶液和10%硫酸溶液中进行模拟加速腐蚀实验,利用XRD、SEM和EDS分析其腐蚀形貌和腐蚀产物,结果表明:TP2铜导体在盐酸和硫酸溶液中的主要腐蚀产物分别为CuCl和CuSO_(4)(H_(2)O)_(5);TP2铜对Cl^(-)和SO_(4)^(2-)表现出不同耐蚀性,对Cl^(-)腐蚀更敏感;硬态和半硬态TP2铜腐蚀产物基本相同,但腐蚀程度与腐蚀形貌不同,半硬态样品腐蚀程度更深、耐蚀性能更差。

Effects of interface slip and semi-rigid joint on elastic seismic response of steel-concrete composite frames

The stiffness matrix of semi-rigidly connected composite beams considering interface slip was established and the calculation method for elastic seismic response of composite frame was derived.The corresponding calculation programs were developed.Introducing the dimensionless quantities that were related to the connector shearing stiffness and the joint rotation stiffness,the influences of interface slip and semi-rigid joint on composite frame were transferred to quantitative parameter analysis,taking account of cross sectional properties,materials and linear stiffness of composite beam synthetically.Based on the calculation programs,free vibration frequencies and seismic responses of semi-rigid joint steel-concrete composite frame considering interface slip were calculated.The influences of interface slip and semi rigid joint on dynamic characteristics and seismic response were analyzed and the seismic design advices were presented.The results show that the interface slip decreases the free vibration frequencies and increase the seismic responses of composite frame.The semi-rigid joint reduces the free vibration frequencies and increases seismic responses of composite frame compared with rigid joint.With the increase of joint rotational stiffness,the elastic seismic responses of composite frame increase firstly and then decrease.The effects are related to the ratio of joint rotation stiffness to linear stiffness of composite beam.