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基于响应面法内燃机整体式连杆热锻模具失效分析
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作者 董竹林 王培安 《工具技术》 北大核心 2021年第12期97-102,共6页
以内燃机整体式连杆作为研究对象,基于数值模拟技术,以动模滑移速度﹑表面温度和表面压强为动模磨损量的判断依据,预测动模磨损位置;基于正交试验和响应面法,对桥部高度、模具硬度、摩擦系数和模腔边缘圆角进行多因素离散试验,预测内燃... 以内燃机整体式连杆作为研究对象,基于数值模拟技术,以动模滑移速度﹑表面温度和表面压强为动模磨损量的判断依据,预测动模磨损位置;基于正交试验和响应面法,对桥部高度、模具硬度、摩擦系数和模腔边缘圆角进行多因素离散试验,预测内燃机整体式连杆动模磨损量;对优化结果连续进行10次数值模拟,绘制拟合曲线,计算动模使用寿命。试验结果表明,动模位置1所属区域为磨损最严重区域,响应面优化后动模磨损量预测最优值为1.28013×10^(-5) mm,对应的参数组合为桥部高度1.8mm,模具硬度HRC60,摩擦系数0.3和模腔边缘圆角2.0mm。该参数组合下,模拟动模磨损量最优值为1.342×10^(-5) mm,该动模磨损量方程拟合数据均符合边界要求,模型数据可信度高,误差仅为4.61%,可得内燃机整体式连杆动模寿命为4186次,符合生产要求。 展开更多
关键词 连杆 数值 动模磨损 响应面法 寿命预测
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Numerical simulation of wheel wear evolution for heavy haul railway 被引量:13
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作者 王璞 高亮 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期196-207,共12页
The prediction of the wheel wear is a fundamental problem in heavy haul railway. A numerical methodology is introduced to simulate the wheel wear evolution of heavy haul freight car. The methodology includes the spati... The prediction of the wheel wear is a fundamental problem in heavy haul railway. A numerical methodology is introduced to simulate the wheel wear evolution of heavy haul freight car. The methodology includes the spatial coupling dynamics of vehicle and track, the three-dimensional rolling contact analysis of wheel-rail, the Specht's material wear model, and the strategy for reproducing the actual operation conditions of railway. The freight vehicle is treated as a full 3D rigid multi-body model. Every component is built detailedly and various contact interactions between parts are accurately simulated, taking into account the real clearances. The wheel-rail rolling contact calculation is carried out based on Hertz's theory and Kalker's FASTSIM algorithm. The track model is built based on field measurements. The material loss due to wear is evaluated according to the Specht's model in which the wear coefficient varies with the wear intensity. In order to exactly reproduce the actual operating conditions of railway,dynamic simulations are performed separately for all possible track conditions and running velocities in each iterative step.Dimensionless weight coefficients are introduced that determine the ratios of different cases and are obtained through site survey. For the wheel profile updating, an adaptive step strategy based on the wear depth is introduced, which can effectively improve the reliability and stability of numerical calculation. At last, the wear evolution laws are studied by the numerical model for different wheels of heavy haul freight vehicle running in curves. The results show that the wear of the front wheelset is more serious than that of the rear wheelset for one bogie, and the difference is more obvious for the outer wheels. The wear of the outer wheels is severer than that of the inner wheels. The wear of outer wheels mainly distributes near the flange and the root; while the wear of inner wheels mainly distributes around the nominal rolling circle. For the outer wheel of front wheelset of each bogie, the development of wear is gradually concentrated on the flange and the developing speed increases continually with the increase of traveled distance. 展开更多
关键词 heavy haul railway wheel wear evolution wheel-rail rolling contact vehicle-track coupling dynamics profile updating
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Modeling and verification of comprehensive errors of real-time wear-depth detecting for spherical plain bearing tester 被引量:1
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作者 LI Wei HU Zhan-qi +2 位作者 YANG Vu-lin FAN Bing-li ZHOU Hai-li 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第3期533-545,共13页
Because of various error factors,the detecting errors in the real-time experimental data of the wear depth affect the accuracy of the detecting data.The self-made spherical plain bearing tester was studied,and its tes... Because of various error factors,the detecting errors in the real-time experimental data of the wear depth affect the accuracy of the detecting data.The self-made spherical plain bearing tester was studied,and its testing principle of the wear depth of the spherical plain bearing was introduced.Meanwhile,the error factors affecting the wear-depth detecting precision were analyzed.Then,the comprehensive error model of the wear-depth detecting system of the spherical plain bearing was built by the multi-body system theory(MBS).In addition,the thermal deformation of the wear-depth detecting system caused by varying the environmental temperature was detected.Finally,according to the above experimental parameters,the thermal errors of the related parts of the comprehensive error model were calculated by FEM.The results show that the difference between the simulation value and the experimental value is less than 0.005 mm,and the two values are close.The correctness of the comprehensive error model is verified under the thermal error experimental conditions. 展开更多
关键词 spherical plain bearing tester self-lubricating spherical plain bearing wear depth multi-body system theory comprehensive error model thermal error
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