排序方式: 共有56条查询结果,搜索用时 15 毫秒
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本文讨论了船用双平衡环挠性陀螺仪接头的设计准则,进行了接头的刚度计算及承载能力和强度分析,从而为设计高精度挠性陀螺仪提供了重要的参考依据。 相似文献
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谐振式浮轨扣件是一种高性能的轨道减振降噪扣件,有利于解决城市轨道交通轨道所产生的振动与噪声问题。这种扣件安装质量的好坏会直接影响到其减振降噪性能的发挥。介绍了谐振式浮轨扣件特点及在地铁线路中的施工工艺,同时对现场实际遇到问题的解决方法及列车正常运行时该扣件相关的维护工作也作了相应的介绍。 相似文献
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Vibration control is gaining focuses in the field of offshore wind turbines (OWTs) in recent years as the turbine tower becomes taller and more slender. Although a number of research works have been carried out to control the OWT vibrations, using tuned mass damper (TMD) and multiple tuned mass dampers (MTMDs) to control the jacket–type OWT vibrations is rarely reported, especially for the MTMDs, of which the application in the field of OWTs is still in the initial stage. This study focuses on the performance of TMD and MTMDs in controlling the tower vibrations of the jacket–type OWT subjected to the combined wind, wave and current loads, which are the most common external vibration resources for OWTs. The control effectiveness is numerically investigated and evaluated by the reductions of the standard deviation displacement (σ(d)) and the standard deviation acceleration (σ(a)) of the tower top. After the installation of TMD, σ(d) and σ(a) are reduced by 32% and 29% respectively. Larger TMD mass ratios lead to better control effectiveness, but the improvement becomes less obvious as the mass ratios constantly increase. The control effectiveness of the MTMD system is slightly decreased compared with a single large TMD. However, the robustness of MTMDs is superior since the OWT vibrations can still be controlled effectively even if some TMDs do not function. The control effectiveness of the MTMD system can also be affected by the change in the positions of malfunctioned TMDs. 相似文献
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动态无功补偿装置在牵引变电所的应用 总被引:2,自引:1,他引:1
对于运量较小、列车对数较少的单线电气化铁道,在无功"返送正计"计量方式下,采用固定并联电容补偿往往难以满足变电所功率因数指标要求,甚至出现负面影响.动态无功补偿装置能够根据供电臂牵引负荷变化动态提供系统所需的无功补偿容量.牵引变电所动态无功补偿的设计内容主要包含2个方面:SVC最大无功补偿量的确定和滤波器支路的设计.给出了SVC最大无功补偿量的计算公式.从工程设计角度,对一些著名电力公司的无功总容量分配算法进行了讨论,根据牵引负荷中各次谐波含量的特点,推荐采用BBC公司的无功补偿容量分配算法. 相似文献
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宋瑞 《交通运输系统工程与信息》2001,1(3):261-264
智能铁路系统属智能运输系统(Intelligent Transportation System)有轨交通研究的范 畴,是运输科学研究的前沿与热点.论文在吸收国内外该领城研究成果的基础上,充分考虑到我国铁路运输组织模式的特点,对智能铁路系统列车速度联控行车制理论及线路通过能力问题进行了较为系统深人的开创性研究,研究成果对我国智能铁路系统的开发有重要的参考价值与现实意义. 相似文献
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针对大型货车驾驶员对道路坡度把握不准确而容易导致长大下坡路段出现制动器失效的问题,提出一种用于货车的坡度提示系统。该系统采用陀螺仪实时探测货车所处道路的坡度,并实时显示,当检测到货车连续下坡超过一定长度且没有采取制动时,系统提示驾驶员适当制动,以避免后期车速加大而频繁制动导致制动器失效。经实际验证本系统能有效给驾驶员提示,对减少交通事故有一定实际应用价值。 相似文献