GO methodology is a success-oriented method for system reliability analysis. There are components with multi-fault modes in repairable systems. It is a problem to use the existing GO method to make reliability analysi...GO methodology is a success-oriented method for system reliability analysis. There are components with multi-fault modes in repairable systems. It is a problem to use the existing GO method to make reliability analysis of such repairable systems. A new GO method for reliability analysis of such repairable systems with multifault modes was presented. Firstly, calculation equations of reliability parameters of operators which were used to describe components with multi-fault modes in reparable systems were derived based on Markov process theory. Then, this new GO method was applied in reliability analysis of a hydraulic transmission oil supply system( HTOSS) of a power-shift steering transmission at low and high speeds. Finally,Compared with fault tree analysis( FTA) and Monte Carlo simulation,the results show that this new GO method is correct and suitable for reliability analysis of repairable system with multi-fault modes.展开更多
A method of multiple outputs least squares support vector regression （LS-SVR） was developed and described in detail, with the radial basis function （RBF） as the kernel function. The method was applied to predict t...A method of multiple outputs least squares support vector regression （LS-SVR） was developed and described in detail, with the radial basis function （RBF） as the kernel function. The method was applied to predict the future state of the power-shift steering transmission （PSST）. A prediction model of PSST was gotten with multiple outputs LS-SVR. The model performance was greatly influenced by the penalty parameter γ and kernel parameter σ2 which were optimized using cross validation method. The training and prediction of the model were done with spectrometric oil analysis data. The predictive and actual values were compared and a fault in the second PSST was found. The research proved that this method had good accuracy in PSST fault prediction, and any possible problem in PSST could be found through a comparative analysis.展开更多
This research presents an advanced study on the modeling and stability analysis of electro-hydraulic control modules used in intelligent chassis systems.Firstly,a comprehensive nonlinear mathematical model of the elec...This research presents an advanced study on the modeling and stability analysis of electro-hydraulic control modules used in intelligent chassis systems.Firstly,a comprehensive nonlinear mathematical model of the electro-hydraulic power-shift system is developed,incorporating pipeline characteristics through impedance analysis and examining coupling effects between the pilot solenoid valve,main valve,and pipeline.Then,the model’s accuracy is validated through experimental testing,demonstrating high precision and minimal model errors.A comparative analysis between simulation data(both with and without pipeline characteristics)and experimental results reveals that the model considering pipeline parameters aligns more closely with experimental data,highlighting its superior accuracy.The research further explores the influence of key factors on system stability,including damping coefficient,feedback cavity orifice diameter,spring stiffness,pipeline length,and pipeline diameter.Significant findings include the critical impact of damping coefficient,orifice diameter,and pipeline length on stability,while spring stiffness has a minimal effect.These findings provide valuable insights for optimizing electro-hydraulic control modules in intelligent chassis systems,with practical implications for automotive and construction machinery applications.展开更多
双有源桥式(dual active bridge,DAB)变流器目前广泛应用于直流微网、燃料电池、电动汽车等领域,其具有功率密度高、能量双向流动、电气隔离、易于实现软开关等优点,但目前在轨道交通变流器领域应用较少。针对轨道交通领域高压大功率、...双有源桥式(dual active bridge,DAB)变流器目前广泛应用于直流微网、燃料电池、电动汽车等领域,其具有功率密度高、能量双向流动、电气隔离、易于实现软开关等优点,但目前在轨道交通变流器领域应用较少。针对轨道交通领域高压大功率、模块化应用场景的特殊需求,文章创新性地设计了一种基于单移相控制的ISOP-DAB(input-series output-parallel,ISOP)双向储能变流器,将其应用于某型出口机车项目,能够实现动力电池与牵引直流母线之间的能量双向流动,并针对性地解决了ISOP-DAB的输入侧均压与输出侧均流的问题,系统性地分析了在此控制策略下,双向储能变流器的基本工作原理和功率传输特性。通过引入动态解耦控制算法,实现了输出电压稳定与模块均衡的双目标协同控制。最后,通过MATLAB搭建仿真模型进行仿真试验,并且完成了包含充放电切换、动态负载等实物整柜型式试验,验证了该控制策略的有效性与可行性,为轨道交通领域双向储能变流器的模块化设计提供了理论依据和工程实践参考。展开更多
基金Technical Basis Projects of China's MIIT(No.2012090003)
文摘GO methodology is a success-oriented method for system reliability analysis. There are components with multi-fault modes in repairable systems. It is a problem to use the existing GO method to make reliability analysis of such repairable systems. A new GO method for reliability analysis of such repairable systems with multifault modes was presented. Firstly, calculation equations of reliability parameters of operators which were used to describe components with multi-fault modes in reparable systems were derived based on Markov process theory. Then, this new GO method was applied in reliability analysis of a hydraulic transmission oil supply system( HTOSS) of a power-shift steering transmission at low and high speeds. Finally,Compared with fault tree analysis( FTA) and Monte Carlo simulation,the results show that this new GO method is correct and suitable for reliability analysis of repairable system with multi-fault modes.
基金Supported by the Ministerial Level Advanced Research Foundation(3031030)the"111"Project(B08043)
文摘A method of multiple outputs least squares support vector regression （LS-SVR） was developed and described in detail, with the radial basis function （RBF） as the kernel function. The method was applied to predict the future state of the power-shift steering transmission （PSST）. A prediction model of PSST was gotten with multiple outputs LS-SVR. The model performance was greatly influenced by the penalty parameter γ and kernel parameter σ2 which were optimized using cross validation method. The training and prediction of the model were done with spectrometric oil analysis data. The predictive and actual values were compared and a fault in the second PSST was found. The research proved that this method had good accuracy in PSST fault prediction, and any possible problem in PSST could be found through a comparative analysis.
基金Supported by the Basic Product Innovation Plan for Vehicle Power Scientific Research Project(Grant No.JCCPCX201704).
文摘This research presents an advanced study on the modeling and stability analysis of electro-hydraulic control modules used in intelligent chassis systems.Firstly,a comprehensive nonlinear mathematical model of the electro-hydraulic power-shift system is developed,incorporating pipeline characteristics through impedance analysis and examining coupling effects between the pilot solenoid valve,main valve,and pipeline.Then,the model’s accuracy is validated through experimental testing,demonstrating high precision and minimal model errors.A comparative analysis between simulation data(both with and without pipeline characteristics)and experimental results reveals that the model considering pipeline parameters aligns more closely with experimental data,highlighting its superior accuracy.The research further explores the influence of key factors on system stability,including damping coefficient,feedback cavity orifice diameter,spring stiffness,pipeline length,and pipeline diameter.Significant findings include the critical impact of damping coefficient,orifice diameter,and pipeline length on stability,while spring stiffness has a minimal effect.These findings provide valuable insights for optimizing electro-hydraulic control modules in intelligent chassis systems,with practical implications for automotive and construction machinery applications.
文摘双有源桥式(dual active bridge,DAB)变流器目前广泛应用于直流微网、燃料电池、电动汽车等领域,其具有功率密度高、能量双向流动、电气隔离、易于实现软开关等优点,但目前在轨道交通变流器领域应用较少。针对轨道交通领域高压大功率、模块化应用场景的特殊需求,文章创新性地设计了一种基于单移相控制的ISOP-DAB(input-series output-parallel,ISOP)双向储能变流器,将其应用于某型出口机车项目,能够实现动力电池与牵引直流母线之间的能量双向流动,并针对性地解决了ISOP-DAB的输入侧均压与输出侧均流的问题,系统性地分析了在此控制策略下,双向储能变流器的基本工作原理和功率传输特性。通过引入动态解耦控制算法,实现了输出电压稳定与模块均衡的双目标协同控制。最后,通过MATLAB搭建仿真模型进行仿真试验,并且完成了包含充放电切换、动态负载等实物整柜型式试验,验证了该控制策略的有效性与可行性,为轨道交通领域双向储能变流器的模块化设计提供了理论依据和工程实践参考。
