This paper mainly focuses on stability analysis of the nonlinear active disturbance rejection control(ADRC)-based control system and its applicability to real world engineering problems.Firstly,the nonlinear ADRC(NLAD...This paper mainly focuses on stability analysis of the nonlinear active disturbance rejection control(ADRC)-based control system and its applicability to real world engineering problems.Firstly,the nonlinear ADRC(NLADRC)-based control system is transformed into a multi-input multi-output(MIMO)Lurie-like system,then sufficient condition for absolute stability based on linear matrix inequality(LMI)is proposed.Since the absolute stability is a kind of global stability,Lyapunov stability is further considered.The local asymptotical stability can be deter-mined by whether a matrix is Hurwitz or not.Using the inverted pendulum as an example,the proposed methods are verified by simulation and experiment,which show the valuable guidance for engineers to design and analyze the NL ADRC-based control system.展开更多
金属材料挤出成型(metal material extrusion, MME)是采用金属粉末与聚合物黏结剂混合丝材为原料,通过成型、脱脂和烧结工艺(shaping-debinding-sintering, S-D-S)制造纯金属零部件的一种增材制造技术。随着MME技术的发展,亟须对其制品...金属材料挤出成型(metal material extrusion, MME)是采用金属粉末与聚合物黏结剂混合丝材为原料,通过成型、脱脂和烧结工艺(shaping-debinding-sintering, S-D-S)制造纯金属零部件的一种增材制造技术。随着MME技术的发展,亟须对其制品的抗冲击性能进行研究,然而相关信息非常匮乏。制备了不同过程参数下的MME试件,并采用夏比摆锤冲击试验研究了其抗冲击性能,探讨了成型方向、填充角度、挤出温度、床温及成型速度等过程参数对试件冲击吸收功的影响。结果表明:当填充角度为45°时,侧置方向成型试件的抗冲击性能最佳,水平方向次之,竖直方向最差;而在0°填充角度下,水平方向成型试件性能最好;进一步提高挤出温度、床温并降低成型速度,可以显著增强试件的抗冲击性能。研究结果为优化MME成型参数提供了理论依据,拓展了其在承受冲击载荷场景下的应用潜力。展开更多
基金supported by the National Natural Science Foundation of China(61836001).
文摘This paper mainly focuses on stability analysis of the nonlinear active disturbance rejection control(ADRC)-based control system and its applicability to real world engineering problems.Firstly,the nonlinear ADRC(NLADRC)-based control system is transformed into a multi-input multi-output(MIMO)Lurie-like system,then sufficient condition for absolute stability based on linear matrix inequality(LMI)is proposed.Since the absolute stability is a kind of global stability,Lyapunov stability is further considered.The local asymptotical stability can be deter-mined by whether a matrix is Hurwitz or not.Using the inverted pendulum as an example,the proposed methods are verified by simulation and experiment,which show the valuable guidance for engineers to design and analyze the NL ADRC-based control system.
文摘金属材料挤出成型(metal material extrusion, MME)是采用金属粉末与聚合物黏结剂混合丝材为原料,通过成型、脱脂和烧结工艺(shaping-debinding-sintering, S-D-S)制造纯金属零部件的一种增材制造技术。随着MME技术的发展,亟须对其制品的抗冲击性能进行研究,然而相关信息非常匮乏。制备了不同过程参数下的MME试件,并采用夏比摆锤冲击试验研究了其抗冲击性能,探讨了成型方向、填充角度、挤出温度、床温及成型速度等过程参数对试件冲击吸收功的影响。结果表明:当填充角度为45°时,侧置方向成型试件的抗冲击性能最佳,水平方向次之,竖直方向最差;而在0°填充角度下,水平方向成型试件性能最好;进一步提高挤出温度、床温并降低成型速度,可以显著增强试件的抗冲击性能。研究结果为优化MME成型参数提供了理论依据,拓展了其在承受冲击载荷场景下的应用潜力。
