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Effect of wheel load on wheel Vibration and Sound Radiation

Chinese Journal of Mechanical Engineering 2015年第1期28卷 46-54页

作者： HAN Jian WANG Ruiqian WANG Di GUAN Qinghua ZHANG Yumei XIAO Xinbiao JIN Xuesong State Key Laboratory of Traction Power Southwest Jiaotong University

The current researches of wheel vibration and sound radiation mainly focus on the low noise damped wheel. Compared with the traditional research, the relationship between the sound and wheel/rail contact is difficulty and worth studying. However, there are few studies on the effect of wheel load on wheel vibration and sound radiation. In this paper, laboratory test carried out in a semi-anechoic room investigates the effect of wheel load on wheel natural frequencies, damping ratios, wheel vibration and its sound radiation, The laboratory test results show that the vibration of the wheel and total sound radiation decrease significantly with the increase of the wheel load from 0 t to 1 t. The sound energy level of the wheel decreases by 3.7 dB. When the wheel load exceeds 1 t. the attenuation trend of the vibration and sound radiation of the wheel becomes slow. And the increase of the wheel load causes the growth of the wheel natural frequencies and the mode damping ratios. Based on the finite element method （FEM） and boundary element method （BEM）, a rolling noise prediction model is developed to calculate the influence of wheel load on the wheel vibration and sound radiation. In the calculation, the used wheel/rail excitation is the measured wheel/rail roughness. The calculated results show that the sound power level of the wheel decreases by about 0.4 dB when the wheel load increases by 0.5 t. The sound radiation of the wheel decreases slowly with wheel load increase, and this conclusion is verified by the field test. This research systematically studies the cffcct of wheel load on wheel vibration and sound radiation, gives the relationship between the sound and wheel/rail contact and analyzes the reasons, therefore, it provides a reference for further research.

关键词： wheel load vibration and sound radiation finite element method (FEM) boundary element method (BEM) laboratory test field test

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Influence of local geometric parameters on fatigue performance of orthotropic steel deck

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Journal of Central South University 2014年第5期21卷 2091-2099页

作者：宋永生丁幼亮 Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education(Southeast University)

Fatigue has become critical issue for bridge with orthotropic steel *** of stress cycle and equivalent stress amplitude were adopted as two investigated fatigue *** presented from fatigue monitoring comparison of two series-lined bridges,three local geometric parameters of steel box girder have significant influence on fatigue performance of two welded *** are thickness of longitudinal ribs(Tr),longitudinal spacing of transverse floor plate(Sc)and longitudinal truss(LT).Fatigue analytical models were created for parametric study of fatigue effects under wheel ***,three local parameters have exhibited insignificant influence on number of stress *** with Tr and Sc,configuration of LT has brought about foremost effect on the equivalent stress *** equivalent stress amplitude of rib-to-deck and rib-to-rib welded joints,the influence regions of LT are respectively longitudinal strap and quadrate with the geometric length of 600 *** attention ought to be paid for local stiffen structure on fatigue performance of orthotropic steel deck in fatigue design and monitoring.

关键词： fatigue effect orthotropic steel deck local detail structural health monitoring finite element analysis wheel load

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