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Torsional vibration is one of the major problems of the Yangtze-Gorges ship elevator The cause of the vibration and its suppression method are approached in this paper To simplifL analysis, a 2 motor-1 shaft (2M-1s) system instead of real 4 motor-4 shaft (4M-4s) system is investigated first and the analysis results are verified by simulation and experiments. Then the (4M-4s) system is analyzed and simulated and the results show that it is reasonable to simp@ the system by the (2M-IS) one.

The airfield lighting system is very important for airplanes to land and take off safely. It is especially important for night flights. However the environments for the airfield lighting are usually rough and wide, posing great difficulties to inspection and maintaining. For these reasons a airfield lighting monitoring system is urgently required. It could detect the failure position quickly and accurately so that repairs can be done correspondingly. This system checks the working lamplight on-line and transfers the failure message with carrier wave through the power supply cable of the system without adding extra transferring cable. It improved the speed and accuracy of inspection without much cost.