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 Security Analysis for Floating Shock Platform Test Subjected to Underwater Explosion
YANG Li，DU Jian-ye，DU Zhi-peng，WEN Zhao-dong
   2012, 32 (6): 23-25.   DOI: 10.3969/j.issn.1006-1335.2012.06.006
Abstract （1853）      PDF       Save
Security of the floating shock platform test was studied with theoretical analysis and simulation. The safety radius of ship and persons in the water area, the safety distance of typical shore-based buildings, and the ideal safety radius of testing area and depth of the water area were given. This study may?provide a reference for floating shock platform test.
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Environmental Vibration Test and Analysis of Viaduct Bridge of 350 km/h High-speed Railway
HE Yu-long;ZHOU Qing;YANG Li-zhong
   2012, 32 (1): 170-173.   DOI: 10.3969/j.issn.1006-1355-2012.01.040
Abstract （2073）            Save
High-speed trains traveling at high velocities will generate ground vibration pollution, which is one of the main forms of environmental pollution. In order to investigate the environmental vibration level of viaduct bridges of high-speed railway, the environmental vibration is tested and analyzed for No.247 pier of the Yang Cun mega bridge of Beijing-Tianjin Inter-City high-speed railway when the train is traveling through. The result shows that the attenuation regularity of the maximum Z weighted vibration acceleration level VL zmax, the cumulative percent Z weighted vibration acceleration level VL z10, and the equivalent continuous Z weighted vibration acceleration level VL zeq all follow the Logarithmic law with increasing of the distance from the viaduct bridge to the measurement point. There is an obvious attenuation of environmental vibration within 30 m distance from the vibration source, and a smooth attenuation out of 30 m from the vibration source. The value of environmental vibration predicted by the current prediction formula of China’s high-speed train is 9.7 % higher than the measured value within 15 m to 60 m distance from the vibration source.
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Noise Test and Analysis of 350 km/h High-speed Train with Different Distances
DONG Hai-shan;HE Yu-long;YANG Li-zhong;DENG Jun
   2012, 32 (1): 59-61.   DOI: 10.3969/j.issn.1006-1355-2012.01.014
Abstract （3084）            Save
In order to investigate the noise level of different line forms of 350 km/h high-speed train, the noise intensity at different distance from the Beijing-Tianjin Inter-City high-speed railway was tested and analyzed. The result indicates that the noise level radiated by the train reaches the highest at 60m distance. Then the noise level decreases with the distance increasing. The result is significant for noise reduction design of the express train-sets.
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Adaptive Synchronization of Noise-perturbed Chaotic Systems
YANG Li-xin;HE Wan-sheng;LIU Xiao-jun
   2011, 31 (6): 100-103.   DOI: 10.3969/j.issn.1006-1355-2011.06.022
Abstract （1554）            Save
This paper investigates adaptive synchronization between two noise-perturbed chaotic systems with fully uncertain parameters. Based on Lyapunov stability theory and adaptive control theory, the general expression of suitable nonlinear controller is developed. At the same time, the noise-perturbed update laws of parameters are designed and the synchronization between different unknown chaotic systems is realized. Theoretical analysis and numerical simulation are presented, and the effectiveness and feasibility of the adaptive controllers are verified.
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Study on Idle Vibration Control of Steering System
YANG Liang;;WU Xing-rang;;ZHANG Shuo;;TAN Wang-jun;
   2011, 31 (5): 80-85.   DOI: 10.3969/j.issn.1006-1355-2011.05.019
Abstract （2179）            Save
The mechanism and control methods of vibration of the steering wheel at idle are analyzed. Study is focused on the transmission path of the half shaft universal joint and the main influencing factors of natural frequency of the steering system. Aiming at the problem of overly large vibration of the steering wheel at idle condition for an AT vehicle when the air conditioner is switched on, the excitation source, the main transfer path and the steering system modals are analyzed. The main cause of the huge vibration is found to be the extremely large force from the half shaft and the coupling effect of the steering wheel natural frequency and the engine excitation frequency. Through reducing the idle target speed of the engine by 50rpm, changing the drive shaft universal joint from DO-type to GI-type and strengthening the steering column structure, the transfer force of the half shaft is reduced significantly and the natural frequency of the steering system is increased, so that the idle vibration of the steering wheel is controlled effectively.
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