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高速轮轨磨耗问题及其小蠕滑解决方案
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作者 范军 杨晶 +1 位作者 朴明伟 孔凡庚 《大连交通大学学报》 CAS 2018年第3期63-68,74,共7页
在遵循相关技术规律的前提条件下,高速铁路轮轨关系技术管理应当明确小蠕滑解决方案及其技术优势,利用动态设计方法 DDM,解决RSS转向架及其轮对自稳定问题和RFS转向架不稳定蛇行振荡及其校正两个主要技术问题,且形成经济型或安全型设计... 在遵循相关技术规律的前提条件下,高速铁路轮轨关系技术管理应当明确小蠕滑解决方案及其技术优势,利用动态设计方法 DDM,解决RSS转向架及其轮对自稳定问题和RFS转向架不稳定蛇行振荡及其校正两个主要技术问题,且形成经济型或安全型设计及其创新技术特点.线路跟踪测试与动态仿真分析均表明:车轮自旋蠕滑奇异性是造成轮轨滚动接触不连续或不均匀磨耗的主要成因之一,其与专车专线、客运专线以及客货混用等铁路运营方式无关.根据单/双循环工作原理,抗蛇行并联配置的动态特性具有超前滞后校正的相似性.利用这一相似性,制订了转向架参数优配技改方案.如ICE3技改设计在合理的轮配条件下极限速度提升至480 km/h,快铁与高铁运用实现了对钢轨磨耗的互补性. 展开更多
关键词 高速轮轨磨耗 车轮小蠕滑 极限速度 rss/rfs转向架
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Advances in Intrusion Detection System for WLAN
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作者 Ravneet Kaur 《Advances in Internet of Things》 2011年第3期51-54,共4页
A wireless network is not as secure as compare the wired network because the data is transferred on air so any intruder can use hacking techniques to access that data. Indeed it is difficult to protect the data and pr... A wireless network is not as secure as compare the wired network because the data is transferred on air so any intruder can use hacking techniques to access that data. Indeed it is difficult to protect the data and provide the user a secure information system for lifetime. An intrusions detection system aim to detect the different attacks against network and system. An intrusion detection system should be capable for detecting the misuse of the network whether it will be by the authenticated user or by an attacker. Cross layer based technique help to make decision based on two layer physical layer where we compute RSS value and on MAC layer where one compute RTS-CTS time taken. This will reduce the positive false rate.They detect attempts and active misuse either by legitimate users of the information systems or by external. The paper has higlighted the advances in intrusion detection in wireless local area network. 展开更多
关键词 Reciever Signal Strength (rss) Time Taken for RTS-CTS HANDSHAKE (TT) RADIO Frequency (rf)
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