Gaoya dianqi, 2021 配电变压器进行短路冲击试验过程中需要较大的瞬时能量,若采用专用线路以及发电机组的冲击方式需要同步开关、调节阻抗、发电机以及专用线路等,不仅现场可操作性低,同时存在影响系统稳定性的风险。为解决上述配电变压器短路冲击中存在的问题,文中基于变压器、储能电容器与电力电子变换装置,提出了配电变压器储能式短路冲击试验方法,并在此基础上设计了一套配电变压器储能式短路冲击试验系统,实现了短路冲击试验状态量的快速调节,并通过同类型储能冲击装置的串并联完成冲击容量的提升。通过仿真以及现场试验 ...
牛勃 +5 more
doaj
Impact resistance performance of rockbolt system with(out) rubber cushion energy absorbing and buffering components [PDF]
The practice of impact resistance support in dangerous roadways has shown that energy absorbing and buffering components can improve the impact resistance performance of rockbolt support systems. A rubber cushion layer was used as an energy absorbing and
Fuqiang GAO +8 more
core +1 more source
Performance optimization and lightweight design of floating raft vibration isolation system based on RBF-PSO algorithm [PDF]
ObjectiveTo address the challenges of heavy workload and long iterative cycles in the lightweight design of floating raft vibration isolation system in engineering applications, this study proposes a lightweight design method based on RBF-PSO multi ...
Guanjun ZHANG +3 more
core +1 more source
Constitutive model and dynamic deformation behavior of 800 MPa grade cold-rolled dual phase steel [PDF]
, 2016 The Hopkinson experiment system was used to do the dynamic tensile experiment of 800 MPa grade cold rolled dual phase steel (DP800). The strain rate was determined as 500, 1000 and 2250 s-1 By comparing the experimental results, both the yield strength ...
CAI Heng-jun +3 more
core +1 more source
Impact Resistance Evaluation of Pier Structures Subject to Corrosion in Marine Environments [PDF]
, 2016 考虑大量桥梁未设置安全岛或其它类型的防撞设施，桥墩客观存在着船撞的风险，并可能因为船撞产生局部破坏甚至整体倒塌。与此同时，桥梁还不可避免地受到腐蚀引起的性能退化，特别是海洋环境下钢筋混凝土桥梁出现的腐蚀劣化问题尤为突出。目前对于旧桥的抗冲击性能评估，鲜有学者考虑结构腐蚀劣化带来的影响，这可能造成评价结果偏于不安全。因此，有必要细致考虑腐蚀因素对桥墩柱性能的影响，在此基础上，进一步分析墩柱腐蚀对其抗冲击性能的影响。 本文首先根据结构腐蚀劣化的机理及其对桥墩柱结构的危害，确定结构腐蚀退化因素 ...
王永辉
core
Characteristics of deformation and failure of surrounding rock in roadway under strong impact load and control technology [PDF]
In response to the challenging problem of deformation and failure of surrounding rock and support structures in roadways under rock burst, a comprehensive research approach involving numerical calculations, field measurements, and laboratory experiments ...
Jiankang JIAO +4 more
core +1 more source
Dianci bileiqi, 2023 我国某长输管道所属站场曾发生雷击造成站内设备损坏事件，给站内安全生产造成严重影响，而接地装置是泄放雷击电流的重要设施，接地装置连接状态不良将影响其冲击接地阻抗。首先测量了阀室不同位置的冲击阻抗和工频接地电阻，对二者的关系进行了对比分析，研究发现：阀室各测点的实际冲击阻抗远大于工频接地电阻，不能用工频接地电阻乘冲击系数评估其冲击阻抗。利用冲击阻抗时变曲线不仅可以去判断接地网整体是否连接良好，还可以去分析不同测点之间是经过拓扑分支相连还是直接相连的；发现A阀室接地网整体接地良好，B阀室接地网存在个别接地不良，
刘勇 +5 more
doaj
Smart LED Lighting with brightness control and adjustable color temperature [PDF]
, 2015 光带给人类以光明与希望。LED光源更是在照明领域崭露头角，与传统的照明方式相比，LED照明不仅能简单地进行亮度调节，还能进行各种色彩与色温调节。本论文根据市场对节能、健康、舒适和智能照明的需求，设计并实现了一款调光调色温球泡灯智能控制系统。设计开发了一款10W的2.4G射频智能调光调色温LED照明驱动系统，可实现30米距离的遥控控制。该驱动系统所涉及功率范围能功率因数大于0.8。在此基础上提出一种基于PWM的算法对两路白光LED进行独立的调光调色温，完成了控制电路和遥控器的整套系统集成 ...
陈巧敏
core
Dynamic boundary characteristics for truncated model of V-shaped orthogonally stiffened plates [PDF]
ObjectiveTo investigate the dynamic characteristics of local structures in naval architecture and ocean engineering, the dynamic boundary equivalence method between truncated model and original model is proposed.MethodThe finite element method is used to
Dong TANG +4 more
core +1 more source