描述:
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.
描述:
航天产业在国家战略中的地位与作用日益突显,是提升国家竞争力和影响力的关键。作为战略性前沿技术领域,航空航天技术的发展和进步无疑是推动航空航天产业技术创新、促进航天产业快速发展的重要引擎。本文基于web of science数据库,以JCR收录的30个航空航天工程领域的科技期刊在2006-2015年间所刊载的科技论文为数据源,运用科学计量方法,对主要航天国家在航空航天技术领域的研究现状和发展态势进行分析,着重完成中国与美国、欧盟、俄罗斯以及日本和印度等五个国家(地区)的比较分析。研究发现:全球对航空航天领域的研究热度持续升高,并保持增长的态势;美欧航空航天技术研究依旧处于领先地位,其研究热点更加集中于航天前沿技术探索上,而中国和其他主要航天国家更加重视航天技术的应用研究;中国与世界航天强国相比,存在一定的差距。本文旨在于为建设航天强国提供参考和建议。