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| 1 | 汽车手动变速箱的齿轮敲击模拟和分析显示文摘本文阐述了汽车手动变速箱的扭振模型和分析 ,该模型是为齿轮敲击的分析和预测而开发的。它尽可能包容了动力传动系的许多部件去研究所有速度工况的敲击响应 ,模型包括的元件有发动机、离合器、飞轮、承载和非承载齿轮以及传动轴。适用于 MATLAB的数值方法用来解动力分析采用的差分方程。所得结果显示了模型和分析图解的有效性。已经开发了一个软件包可用于观察和分析任何动力传动系模型。本文介绍了采用该软件包分析 Daimler- Chrysler T3 5 0变速箱和其结果 ,它表明了齿轮敲击可能出现双侧、单侧和不规则碰撞三种主要的形式。敲击系数可用来比较不同齿轮副产生敲击的大小 ,它对于为最好地降低敲击声协调离合器是十分有益的。 | M.Y.Wang R.Manoj W.Zhao | 2002 | 传动技术2002，16，4： | 12 |
| 2 | Crack initiation of granite under uniaxial compression tests:A comparison study显示文摘In this study,a combination of acoustic emission(AE)method(AEM)and wave transmission method(WTM)is used to investigate the behaviors of AE and ultrasonic properties corresponding to initial fracturing in granitic rocks.The relationships of AE characteristics,frequency spectra,and spatial locations with crack initiation(CI)are studied.The anisotropic ultrasonic characteristics,velocity distributions in different ray paths,wave amplitudes,and spectral characters of transmitted waves are investigated.To identify CI stress,damage initiations characterized by strain-based method(SBM),AEM and WTM are compared.For granite samples,it shows that the ratio of CI stress to peak strength estimated by SBM ranges from 0.4 to 0.55,and 0.49-0.6 by WTM,which are higher than that of AEM(0.38-0.46).The CI stress identified by AEM indicates the onset of microcracking,and the combination of AEM and WTM provides an insight into the detection of rock damage initiation and anisotropy. | G.K.Zhang H.B.Li M.Y.Wang X.F.Li | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，3： | 3 |
| 3 | Effect of surface roughness on the aerodynamics of a high-speed train subjected to crosswinds显示文摘The irregularities on trains bodies are normally ignored or greatly simplified in studies concerned with aerodynamics.However,surface roughness is known to affect the flow characteristics in the boundary layer near the wall,hence potentially influencing the aerodynamic performance of a train.This work investigates the effects of roughness on the overall aerodynamic characteristics of a high-speed train subjected to crosswinds.Both experimental work and numerical work have been conducted to simulate a typical high-speed train with a 90?yaw angle,with both a smooth and rough surface.Roughness is applied to the roof of the train surface in the form of longitudinal strips.Results reveal that the addition of roughness is able to reduce the surface pressure on the roof and leeside of the train.Numerical results agree well with experimental ones and confirm that an increase in the roughness relative size can effectively restrain flow separation and reduce surface pressure.Moreover,numerical simulation results show that side force coefficient and roll moment coefficient subjected to rough model significantly decreased compared with smooth model.The conclusions drawn in this study offer the chance to derive critical reference values for the optimization of the aerodynamic characteristics of high-speed trains. | M.Y.Wang S.A.Hashmi Z.X.Sun D.L.Guo G.Vita G.W.Yang H.Hemida | 2021 | Acta Mechanica Sinica2021，37，7： | 1 |
| 4 | Aerodynamic shape optimization of an urban maglev train显示文摘With rapid development of urban rail transit,maglev trains,benefiting from its comfortable,energy-saving and environmentally friendly merits,have gradually entered people's horizons.In this paper,aiming at improving the aerodynamic performance of an urban maglev train,the aerodynamic optimization design has been performed.An improved two-point infill criterion has been adopted to construct the cross-validated Kriging model.Meanwhile,the multi-objective genetic algorithm and complex three-dimensional geometric parametrization method have been used,to optimize the streamlined head of the train.Several optimal shapes have been obtained.Results reveal that the optimization strategy used in this paper is sufficiently accurate and time-efficient for the optimization of the urban maglev train,and can be applied in practical engineering.Compared to the prototype of the train,optimal shape benefits from higher lift of the leading car and smaller drag of the whole train.Sensitivity analysis reveals that the length and height of the streamlined head have a great influence on the aerodynamic performance of the train,and strong nonlinear relationships exist between these design variables and aerodynamic performance.The conclusions drawn in this study offer the chance to derive critical reference values for the optimization of the aerodynamic characteristics of urban maglev trains. | Z.X.Sun M.Y.Wang L.Y.Wei F.B.Kong G.W.Yang | 2021 | Acta Mechanica Sinica2021，37，6： | 1 |
| 5 | A novel fuzzy direct torque control system for three-level inverter-fed induction machine显示文摘 | S.X.Liu M.Y.Wang Y.G.Chen S.Li | | 0，，01： | 1 |
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