Entity

Time filter

Source Type


Chen T.,University of Shanghai for Science and Technology | Zheng S.,University of Shanghai for Science and Technology | Zheng S.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | Liu X.,University of Shanghai for Science and Technology | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2015

Based on the field test data of a fuel-cell car (FCC), the statistical characteristics of reliability for the vehicle is analyzed, and combined with the requirements on the reliability indicators of FCC, an analytic hierarchy process (AHP) for reliability allocation based on failure rate variation is proposed to conduct an allocation optimization for reliability indicators of FCC. The results provide theoretical supports for the reliability improvement and lightweight development of FCC and its key components, as well as the technical bases for formulating their reliability growth targets. ©, 2015, SAE-China. All right reserved. Source


Chen T.,University of Shanghai for Science and Technology | Zheng S.,University of Shanghai for Science and Technology | Zheng S.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | Liu X.,University of Shanghai for Science and Technology | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2015

To overcome the difficulties in discriminating and measuring the correlation between multiple failure modes of complex systems, a statistical correlation analysis model for multiple failure modes is proposed based on competing risks theory. The combined failure distribution of the system is established with multivariate lognormal distribution, and a conditional probability-based maximum likelihood function is constructed with its estimates optimized by using simulated annealing algorithm. In large sample condition, the asymptotic covariance matrix of maximum likelihood estimates is obtained by means of Fisher information matrix, and then Delta method is used to derive the variance of correlation matrix. Then, p-values hypothesis testing procedures are developed to discriminate the relationship and degree of correlation between competing failure modes. Finally an analysis on the fault data of a fuel cell engine is conducted to verify the feasibility and effectiveness of the model built. The research provides a theoretical basis for the reliability prediction and allocation of competing failure system and a technical foundation for the study on optimal maintenance strategy. ©, 2015, SAE-China. All right reserved. Source


Sun T.,University of Shanghai for Science and Technology | Sun T.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | Xu Z.,University of Shanghai for Science and Technology | Xu Z.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | And 5 more authors.
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

With consideration of the characteristics of Electric Power Steering system (EPS), vehicle lane keeping system can make full use of EPS function as steering actuator for lane following assist. A couple of vehicle dynamic equations were derived for two operational modes including steering assistant mode and active steering mode. Meanwhile, vehicle single track handling model, nonlinear tire model, driver model, EPS model and corresponding optimal lane tracking algorithm were built and developed respectively. The lane keeping algorithm with EPS actuator was validated by virtue driver-in-the-loop approach based on the EPS experimental map from a certain type of production vehicle. It has been shown that the lane keeping system with EPS assist can effectively improve the capability of tracking the desired path. © 2015, The Editorial Board of Journal of System Simulation. All right reserved. Source


Wang M.,University of Shanghai for Science and Technology | Wang M.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | Sun T.,University of Shanghai for Science and Technology | Sun T.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | And 4 more authors.
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

Due to the complexity of heavy vehicles traffic and driving cycles, only a standalone control system for anti-rollover has its own limitations. Aiming at the heavy vehicles un-tripped rollover problem, a cooperative control algorithm of continuously adjustable damping semi-active suspension andactive anti-roll bar with dynamic force allocation was proposed. From the simulation results, it is indicated that the cooperative methodology can compensate for the respective limitations of semi-active suspension and anti-roll bar for preventing vehicle rollover and improving vehicle stability to a certain extent. ©, 2015, Chinese Association for System Simulation. All right reserved. Source


Sun T.,University of Shanghai for Science and Technology | Sun T.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | Xu Z.,University of Shanghai for Science and Technology | Xu Z.,Machinery Industry Key Laboratory for Mechanical Strength & Reliability Evaluation of Auto Chassis Components | And 8 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

Vehicle optimal cornering-time is one of the most significant aspects in the field of lap time optimization. An optimal cornering-time algorithm was proposed herein based on the Kalman filter and optimal control theory. The Kalman algorithm was used to estimate the motion state of the vehicle, and the optimal trajectories were computed by the optimal control algorithm. A scaled vehicle with Freescale controller was developed subsequently according to the Buckingham Pi theorem based on dynamics similarity to validate the effectiveness of the control algorithm. The experimental results indicate that the scaled vehicle reduces the vehicle cornering-time effectively without sacrificing the vehicle stability. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved. Source

Discover hidden collaborations