Collision properties of minibus when traveling at high speed are studied. Based on the display dynamics and basic theoretical of contact collision analysis, the front crash finite element model of minibus is built by ...Collision properties of minibus when traveling at high speed are studied. Based on the display dynamics and basic theoretical of contact collision analysis, the front crash finite element model of minibus is built by Hypermesh. The model is simulated under the 50 km/h by ANSYS/Ls-Dyna solver. Finally, the deformation of the front rail, B pillar acceleration curve and the steering column intrusion are got. It is important to improve safety design for minibus.展开更多
The advancement of self-driving technologies facilitates the emergence of autonomous minibuses(ABs)in public transportation,which could provide flexible,reliable,and safe mobility services.This study develops an AB ro...The advancement of self-driving technologies facilitates the emergence of autonomous minibuses(ABs)in public transportation,which could provide flexible,reliable,and safe mobility services.This study develops an AB routing and scheduling model considering each passenger’s arrival reliability and travel risk.Firstly,to guarantee each passenger’s arrival on time,the arrival reliability(a predetermined threshold of on-time arrival probability ofα=0.9)is included in the constraints.Secondly,three objectives,including system costs,greenhouse gas(GHG)emissions,and travel risk,are optimized in the model.To assess the travel risk of ABs,an enhanced method based on kernel density estimation(KDE)is proposed.Thirdly,an advanced multi-objective adaptive large neighborhood search algorithm(MOALNS)is designed to find the Pareto optimal set.Finally,experiments are conducted in Shanghai to validate model performance.Results show that it can decrease GHG emissions(−2.12%)and risk(−9.47%),while only increasing costs by 2.02%.Furthermore,the proposed arrival reliability constraint can improve an average of 14.70%of passengers to meet their arrival reliability requirement(α=0.9).展开更多
基金This research was financially supported by the Fund Project： Chongqing Jiaotong University graduate education innovation fund project （Grant NO. 20130138） and Natural Science Foundation of science and technology commission of Chongqing （Grant NO. cstc2013jjB 60001）.
文摘Collision properties of minibus when traveling at high speed are studied. Based on the display dynamics and basic theoretical of contact collision analysis, the front crash finite element model of minibus is built by Hypermesh. The model is simulated under the 50 km/h by ANSYS/Ls-Dyna solver. Finally, the deformation of the front rail, B pillar acceleration curve and the steering column intrusion are got. It is important to improve safety design for minibus.
基金National Natural Science Foundation of China(Grant Nos.71971162 and 52372339).
文摘The advancement of self-driving technologies facilitates the emergence of autonomous minibuses(ABs)in public transportation,which could provide flexible,reliable,and safe mobility services.This study develops an AB routing and scheduling model considering each passenger’s arrival reliability and travel risk.Firstly,to guarantee each passenger’s arrival on time,the arrival reliability(a predetermined threshold of on-time arrival probability ofα=0.9)is included in the constraints.Secondly,three objectives,including system costs,greenhouse gas(GHG)emissions,and travel risk,are optimized in the model.To assess the travel risk of ABs,an enhanced method based on kernel density estimation(KDE)is proposed.Thirdly,an advanced multi-objective adaptive large neighborhood search algorithm(MOALNS)is designed to find the Pareto optimal set.Finally,experiments are conducted in Shanghai to validate model performance.Results show that it can decrease GHG emissions(−2.12%)and risk(−9.47%),while only increasing costs by 2.02%.Furthermore,the proposed arrival reliability constraint can improve an average of 14.70%of passengers to meet their arrival reliability requirement(α=0.9).
