The stability and singularity problem of agile small satellite （ASS） with actuator failure is discussed in this paper. Firstly, the three-axis stabilized controller of an ASS is designed, where micro control moment ...The stability and singularity problem of agile small satellite （ASS） with actuator failure is discussed in this paper. Firstly, the three-axis stabilized controller of an ASS is designed, where micro control moment gyros （MCMG＇s） in pyramid configuration （PC） is used as the actuator. By using the same controller and steering law, the control results before and after one gyro fails are compared by simulation. The variation of singular momentum envelope before and after one gyro fails is also compared. The simulation results show that the failure intensively decreases the capacity of output torque, which leads to the emergence of more singular points and the rapid saturation of MCMG＇s. Finally, the parameters of system controller are changed to compare the control effect.展开更多
With the trend of the worldwide market competition, the globalagile manufacturing will become an advanced manufacturing technology in 21st century, and the Agile Virtual Enterprise (AVE) will also become a new organiz...With the trend of the worldwide market competition, the globalagile manufacturing will become an advanced manufacturing technology in 21st century, and the Agile Virtual Enterprise (AVE) will also become a new organizationform of manufacturing enterprises. As AVE is a complicated enierprise, how tobuild an optimal AVE organization is a difficult problem. In this paper, based onthe analysis of the AVE organization, the methodology for AVE including enterprisearchitecture, reference model, enterprise modeling methods and toolkit, guideline forsystem implementation is proposed. This paper also presents a Virtual Organization Integrated Support Environment (VOISE), which provides the computer-aidedsupport for rapidly building an optimal AVE.展开更多
基金the National Natural Science Foundation of China (10502006)Excellent Young Scholars Research Fund of Beijing Institute of Technology (2007YS0202)
文摘The stability and singularity problem of agile small satellite （ASS） with actuator failure is discussed in this paper. Firstly, the three-axis stabilized controller of an ASS is designed, where micro control moment gyros （MCMG＇s） in pyramid configuration （PC） is used as the actuator. By using the same controller and steering law, the control results before and after one gyro fails are compared by simulation. The variation of singular momentum envelope before and after one gyro fails is also compared. The simulation results show that the failure intensively decreases the capacity of output torque, which leads to the emergence of more singular points and the rapid saturation of MCMG＇s. Finally, the parameters of system controller are changed to compare the control effect.
文摘With the trend of the worldwide market competition, the globalagile manufacturing will become an advanced manufacturing technology in 21st century, and the Agile Virtual Enterprise (AVE) will also become a new organizationform of manufacturing enterprises. As AVE is a complicated enierprise, how tobuild an optimal AVE organization is a difficult problem. In this paper, based onthe analysis of the AVE organization, the methodology for AVE including enterprisearchitecture, reference model, enterprise modeling methods and toolkit, guideline forsystem implementation is proposed. This paper also presents a Virtual Organization Integrated Support Environment (VOISE), which provides the computer-aidedsupport for rapidly building an optimal AVE.
