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Simulation of Spur Gear pair with Faults Using FEA
Yimin SHAO,ZaiGang CHEN,Sheming Wang 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A shock vibration is produced due to the sudden change of meshing stiffness of gears when some faults happen to the gears. The fault signals of the gears are always covered by the noises existing in the surroundings, especially under the strong noise background, which makes it difficult to extract the feature signals of fault accurately.In the field testing, to calculate the meshing stiffness and its change precisely is impossible. So the relationship betweenthe vibration and the meshing stiffness is hard to obtain. In order to solve this problem, the method of finite elementanalysis (FEA) is utilized in this paper to simulate the vibration of a spur gear pair with local fault and calculate the change of meshing stiffness. As a result, the relationships between the vibration of gears and the meshing stiffness are obtained.
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Effect of noise barrier on aerodynamic performance of high-speed train in crosswind
Hai Zhao,Wanming Zhai,Zaigang Chen 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.20 No.4
A three-dimensional aerodynamic model and a vehicle dynamics model are established toinvestigate the effect of noise barrier on the dynamic performance of a high-speed train running on anembankment in crosswind in this paper. Based on the developed model, flow structures around the train withand without noise barrier are compared. Effect of the noise barrier height on the train dynamic performanceis studied. Then, comparisons between the dynamic performance indexes of the train running on thewindward track and on the leeward track are made. The calculated results show that the noise barrier hassignificant effects on the structure of the flow field around the train in crosswind and thus on the dynamicperformance of the high-speed train. The dynamic performance of the train on the windward track is betterthan that on the leeward track. In addition, various heights of the noise barrier will have different effects onthe train dynamic performance. The dynamic performance indexes keep decreasing with the increase of thenoise barrier height before the height reaches a certain value, while these indexes have an inverse trend whenthe height is above this value. These results suggest that optimization on the noise barrier height is possibleand demonstrate that the designed noise barrier height of the existing China Railway High-speed lineanalysed in this article is reasonable from the view point of the flow field structure and train dynamicperformance although the noise barrier is always designed based on the noise-related standard.
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Effect of noise barrier on aerodynamic performance of high-speed train in crosswind
Zhao, Hai,Zhai, Wanming,Chen, Zaigang Techno-Press 2015 Wind and Structures, An International Journal (WAS Vol.20 No.4
A three-dimensional aerodynamic model and a vehicle dynamics model are established to investigate the effect of noise barrier on the dynamic performance of a high-speed train running on an embankment in crosswind in this paper. Based on the developed model, flow structures around the train with and without noise barrier are compared. Effect of the noise barrier height on the train dynamic performance is studied. Then, comparisons between the dynamic performance indexes of the train running on the windward track and on the leeward track are made. The calculated results show that the noise barrier has significant effects on the structure of the flow field around the train in crosswind and thus on the dynamic performance of the high-speed train. The dynamic performance of the train on the windward track is better than that on the leeward track. In addition, various heights of the noise barrier will have different effects on the train dynamic performance. The dynamic performance indexes keep decreasing with the increase of the noise barrier height before the height reaches a certain value, while these indexes have an inverse trend when the height is above this value. These results suggest that optimization on the noise barrier height is possible and demonstrate that the designed noise barrier height of the existing China Railway High-speed line analysed in this article is reasonable from the view point of the flow field structure and train dynamic performance although the noise barrier is always designed based on the noise-related standard.
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Yimin Shao,Xiao Deng,Yilin Yuan,Chris K. Mechefske,Zaigang Chen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
Detecting chatter mark vibration in rolling mills operating under normal working conditions is difficult. A novel characteristic recognitionmethod of chatter mark vibration, where the non-dimensional parameters are calculated with time varying signals and kurtosis undernormal rolling mill operating conditions, is presented in this paper. The character of the chatter mark vibration signal is obtained by calculatingthe kurtosis value of each vibration signal segment obtained by subdividing the raw time varying vibration signal. The probabilitydensity function is utilized to reveal obvious differences between signals with respect to the normal and chatter conditions. Themethod overcomes the limitation of traditional spectrum analysis, which is sensitive to working conditions. Numerical simulation andexperimental results show that the proposed method has better recognition capability than traditional spectrum analysis.
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