Results 21 to 30 of about 5,111 (119)

真空断路器弹簧操动机构机械特性的仿真与优化

open access: yesGaoya dianqi, 2019
为研究配弹簧操动机构真空断路器在空载条件下的机械特性,文中以72.5 kV真空断路器为研究对象,分析了影响真空断路器机械特性的关键零件,建立了真空断路器的Adams与MATLAB联合仿真模型并完成了动力学仿真。仿真所得机械特性曲线与试验曲线吻合,证明了仿真的准确性,并在此基础上对真空断路器机械特性进行优化,为研究真空断路器空载条件下的机械特性提供了有效的手段。
刘超, 赵伟涛, 张强, 刘旭旭
doaj  

Superior Abrasibility of YSZ(ESP)/BN@ZrO2‐Polyester Composite Sealing Coating Reinforcing With Hybrid Micron/Nanometer Multiscaled Pore Structure

open access: yesRare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT Composite materials hold significant potential for abrasive sealing, yet composite materials used for abrasive sealing fall short in service durability under extreme environments. Here, a controllable strategy for adjusting pore structure is proposed, aiming to design a YSZ(ESP)/BN@ZrO2‐polyester coating with hybrid micron/nanometer ...
Shuang Yu   +8 more
wiley   +1 more source

位移传感器在中压断路器机械特性监测中的应用研究

open access: yesGaoya dianqi, 2015
对用于断路器机械特性测试的几种位移传感器原理进行了阐述,针对中压断路器机械操动机构结构紧凑的特点,对影响中压断路器机械特性监测精度的因素进行了分析。设计了抗干扰能力强的传感器信号检测电路,通过机械特性性能测试试验和机械寿命试验证明:旋转编码器和激光位移传感器这两种位移传感器是中压断路器机械特性监测的理想传感器,在不影响断路器原有性能参数及可靠性的情况下,不但能真实地反映其行程特性,而且能够在高电压、大电流、强冲击振动的恶劣环境下长期稳定工作。
张显聪   +6 more
doaj  

Recent Advances in Piezocatalysis and Piezo‐Photocatalysis in Energy and Environment: Materials, Design, and Applications

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Piezocatalytic technology utilizes mechanical strain or stress‐induced piezoelectric phenomena to produce robust internal electric fields, markedly improving the separation efficiency of e−‐h+ pairs. This method has emerged as a focal point in catalysis by removing reliance on conventional light or electrical energy via its mechanical‐to ...
Yue Zhou   +5 more
wiley   +1 more source

A Multifunctional MXene/CNF/PVB Fabric via Layer‐by‐Layer Construction for Electromagnetic Interference Shielding, Joule Heating, and Infrared Stealth

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The rapid advancement of 5G communication technology has intensified electromagnetic pollution, creating an urgent demand for flexible multifunctional fabrics with efficient electromagnetic interference (EMI) shielding performance. This study proposes a novel material‐stacked construction strategy to fabricate multifunctional MXene/cellulose ...
Zong‐Kai Yan   +9 more
wiley   +1 more source

交流中压真空断路器机械特性在线监测装置的研制

open access: yesGaoya dianqi, 2020
在断路器所有故障中,机械故障占有相当大的比重,对其机械特性在线监测具有重要现实意义。文中针对某12 kV交流中压真空断路器,以分合闸线圈电流信号、角位移信号及振动信号为监测对象,研制了一种以STM32F407为主控芯片、搭载RT-Thread实时操作系统的交流中压真空断路器机械特性在线监测装置。该装置采用HNC-661霍尔电流传感器捕获分合闸线圈电流,判断断路器分合闸的动作起始时刻;在低电位处采用WDD35D4-5kΩ角位移传感器替代直线位移传感器间接测量动触头的位移曲线 ...
谭佳明   +5 more
doaj  

快速机械开关机械特性和结构强度研究

open access: yesGaoya dianqi, 2021
电磁斥力机构是快速机械开关的核心部件,在快速合闸和分闸过程中巨大的电磁驱动力会给电磁斥力机构和整个机械传动系统带来强烈的瞬态冲击。针对该问题,文中对电磁斥力机构在合闸和分闸全过程中的机械特性和结构强度进行了研究。采用LS-DYNA建立快速机械开关的有限元仿真计算模型,并求解得到合闸和分闸全过程各零部件的机械运动特性和瞬态冲击强度。采用激光测距对某单断口快速机械开关进行了实验测量,得到合闸和分闸过程的时间—行程特性曲线,实验测量结果和仿真计算结果匹配良好。最后对仿真计算模型进行参数优化,从而降低合闸弹跳 ...
熊杰, 刘彬, 于海波, 刘国伟
doaj  

Cancellous Bone‐Like Sr‐Doped Hydroxyapatite/Gelatin Porous Scaffolds With Nanofibrous Architecture and Ion Release for Promoting Osteogenesis

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Constructing a porous scaffold with the essential features of natural cancellous bone, including structural architecture and biochemical cues, is one of the pivotal factors for effective bone regeneration. In this study, a biomimetic composite porous Gelatin fibrous scaffold (SrHA/Gelatin) incorporating ultralong strontium‐doped hydroxyapatite
Yin‐Chuan Wang   +8 more
wiley   +1 more source

110kV以上GIS中断路器机械特性数据的统计和分析

open access: yesGaoya dianqi, 2015
GIS中断路器机械特性试验可以有效地反应GIS操动机构的动作状况,通过分析在运设备机械特性数据可以有效发现机构和控制回路可能存在的缺陷,减少故障的发生,提高GIS运行可靠性。文中通过对某地市局在运GIS中断路器部分机械特性试验数据和GIS设备中断路器机械缺陷的统计和分析,得出GIS中断路器分合闸时间和线圈电阻变化的规律及其原因,找出影响GIS中断路器机械特性的因素,提出了提高GIS可靠性的方法,为提高GIS设备运行可靠性提供了依据。
张欣   +5 more
doaj  

射频法在高压开关特性的现场检测与评估研究

open access: yesGaoya dianqi, 2020
针对机械性能进行检测是当前高压开关特性检测的主要方法,例如动特性仪、示波器和电秒表,此类方法无法在线进行检测,且检测周期长。针对当前高压开关特性检测中的不足,文中研究射频法在高压开关特性的现场检测与评估的应用。首先对射频法与传统机械特性测试结果的等效性进行了仿真分析,然后基于射频法在现场对某高压开关的性能进行非接触测量与评估。实验结果表明,射频法与传统检测方法检测结果等效性较好,当射频不同期时间大于5 ms时,可以认为高压开关合闸性能不合格,当射频分闸不同期时间大于3 ms ...
牛博   +5 more
doaj  

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