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分散自律调度集中(CTC)已在各个铁路局、各大干线相继投入使用,如何做好CTC网络的维护成为一个重要的课题.结合CTC现有网络管理功能,分析提出了为满足CTC网络的维护和管理,网络管理系统应具备的功能. 相似文献
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Dynamic investigations revealed that lower order harmonic resonance phenomenon exists in the threering gear transmission. That is, when the input speed is close to 1/3, 1/6, 1/9,-“, 1/3n of the primary natural frequency of the transmission, the loads on the bearings and gears are especially high. This paper explained thisphenomenon from the viewpoint of parametric resonance in terms of perturbation technique. A conclusion was drawn that the basic reason for this phenomenon is the primary resonance caused by forcing excitation and para-metric resonance caused by parametric change. 相似文献