Unable to catch up with China and the United States in the short term,the European Union is in an unfavorable position in the booming digital technology sector needed for economic growth.Within the context of intensif...Unable to catch up with China and the United States in the short term,the European Union is in an unfavorable position in the booming digital technology sector needed for economic growth.Within the context of intensifying technological competition and diplomatic strain between China and the US,the EU and European countries have adapted their digital strategies.As a former balance strategy shifts toward constraining Chinese tech companies,Europe’s technological sovereignty is at stake.To enhance European tech capability and control,key measures include increased investment in digital tech,formation of a single European dataspace,and rules based on European values.The interplay between technology and geopolitics and the rising importance of values in digital regulations make possible a technology alliance,despite the introduction of protectionism into the mix.China will need to understand the situation and give positive response.展开更多
In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six de...In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six degree-of-freedom(DOF) nonlinear model with 12 variables is given. Due to low sufficiency of the aerodynamic actuators at high AOA, a thrust vector model with rotatable engine nozzles is derived. Secondly, the active disturbance rejection control(ADRC) is used to realize a three-channel decoupling control such that a strong coupling between different channels can be treated as total disturbance, which is estimated by the designed extended state observer. The control surface allocation is implemented by the traditional daisy chain method. Finally,the effectiveness of the presented control strategy is demonstrated by some numerical simulation results.展开更多
文摘Unable to catch up with China and the United States in the short term,the European Union is in an unfavorable position in the booming digital technology sector needed for economic growth.Within the context of intensifying technological competition and diplomatic strain between China and the US,the EU and European countries have adapted their digital strategies.As a former balance strategy shifts toward constraining Chinese tech companies,Europe’s technological sovereignty is at stake.To enhance European tech capability and control,key measures include increased investment in digital tech,formation of a single European dataspace,and rules based on European values.The interplay between technology and geopolitics and the rising importance of values in digital regulations make possible a technology alliance,despite the introduction of protectionism into the mix.China will need to understand the situation and give positive response.
基金supported by the National Natural Science Foundation of China(61973175,61973172)。
文摘In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six degree-of-freedom(DOF) nonlinear model with 12 variables is given. Due to low sufficiency of the aerodynamic actuators at high AOA, a thrust vector model with rotatable engine nozzles is derived. Secondly, the active disturbance rejection control(ADRC) is used to realize a three-channel decoupling control such that a strong coupling between different channels can be treated as total disturbance, which is estimated by the designed extended state observer. The control surface allocation is implemented by the traditional daisy chain method. Finally,the effectiveness of the presented control strategy is demonstrated by some numerical simulation results.
