The electromagnetic levitation system(EMLS)serves as the most important part of any magnetic levitation system.However,its characteristics are defined by its highly nonlinear dynamics and instability.Furthermore,the u...The electromagnetic levitation system(EMLS)serves as the most important part of any magnetic levitation system.However,its characteristics are defined by its highly nonlinear dynamics and instability.Furthermore,the uncertainties in the dynamics of an electromagnetic levitation system make the controller design more difficult.Therefore,it is necessary to design a robust control law that will ensure the system’s stability in the presence of these uncertainties.In this framework,the dynamics of an electromagnetic levitation system are addressed in terms of matched and unmatched uncertainties.The robust control problem is translated into the optimal control problem,where the uncertainties of the electromagnetic levitation system are directly reflected in the cost function.The optimal control method is used to solve the robust control problem.The solution to the optimal control problem for the electromagnetic levitation system is indeed a solution to the robust control problem of the electromagnetic levitation system under matched and unmatched uncertainties.The simulation and experimental results demonstrate the performance of the designed control scheme.The performance indices such as integral absolute error(IAE),integral square error(ISE),integral time absolute error(ITAE),and integral time square error(ITSE)are compared for both uncertainties to showcase the robustness of the designed control scheme.展开更多
超高速磨削可大幅度提高磨削效率，减少砂轮磨损，提高零件加工质量，是一项具有强大生命力和广阔前景的技术。轴承技术是超高速大功率磨削主轴系统的关键技术。本文介绍了一种适于超高速大功率工况的新型液体动静压混合轴承 (简称 SS－...超高速磨削可大幅度提高磨削效率，减少砂轮磨损，提高零件加工质量，是一项具有强大生命力和广阔前景的技术。轴承技术是超高速大功率磨削主轴系统的关键技术。本文介绍了一种适于超高速大功率工况的新型液体动静压混合轴承 (简称 SS－ HP HJB)，详细介绍了 SS－ HP HJB的结构形式、理论分析及数值计算。实验结果与理论分析结果很好地吻合，二者共同表明， SS－ HP HJB具有良好的稳态性能。展开更多
文摘The electromagnetic levitation system(EMLS)serves as the most important part of any magnetic levitation system.However,its characteristics are defined by its highly nonlinear dynamics and instability.Furthermore,the uncertainties in the dynamics of an electromagnetic levitation system make the controller design more difficult.Therefore,it is necessary to design a robust control law that will ensure the system’s stability in the presence of these uncertainties.In this framework,the dynamics of an electromagnetic levitation system are addressed in terms of matched and unmatched uncertainties.The robust control problem is translated into the optimal control problem,where the uncertainties of the electromagnetic levitation system are directly reflected in the cost function.The optimal control method is used to solve the robust control problem.The solution to the optimal control problem for the electromagnetic levitation system is indeed a solution to the robust control problem of the electromagnetic levitation system under matched and unmatched uncertainties.The simulation and experimental results demonstrate the performance of the designed control scheme.The performance indices such as integral absolute error(IAE),integral square error(ISE),integral time absolute error(ITAE),and integral time square error(ITSE)are compared for both uncertainties to showcase the robustness of the designed control scheme.
文摘超高速磨削可大幅度提高磨削效率，减少砂轮磨损，提高零件加工质量，是一项具有强大生命力和广阔前景的技术。轴承技术是超高速大功率磨削主轴系统的关键技术。本文介绍了一种适于超高速大功率工况的新型液体动静压混合轴承 (简称 SS－ HP HJB)，详细介绍了 SS－ HP HJB的结构形式、理论分析及数值计算。实验结果与理论分析结果很好地吻合，二者共同表明， SS－ HP HJB具有良好的稳态性能。
