查诸汉英词典,发现成语“百足之虫,死而不僵”有如下英译: 《现代汉英词典》(外语教学与研究出版社,1988年11月第1版,p.15):a cenipede does topple over even when dead a centipede dies but never falls down; 《汉英常用熟语词典》...查诸汉英词典,发现成语“百足之虫,死而不僵”有如下英译: 《现代汉英词典》(外语教学与研究出版社,1988年11月第1版,p.15):a cenipede does topple over even when dead a centipede dies but never falls down; 《汉英常用熟语词典》(尹邦彦编,江苏教育出版社,1989年1月第1版,p.16):A centipede dies but never stiffens; 《汉英词典》(商务印书馆,1978年10月第1版,p.14):a centipede does not topple over even When dead; a centipede dies but never falls down;展开更多
A robust H∞ directional controller for a sampled-data autonomous airship with polytopic parameter uncertainties was proposed. By input delay approach, the linearized airship model was transformed into a continuous-ti...A robust H∞ directional controller for a sampled-data autonomous airship with polytopic parameter uncertainties was proposed. By input delay approach, the linearized airship model was transformed into a continuous-time system with time-varying delay. Sufficient conditions were then established based on the constructed Lyapunov-Krasovskii functional, which guarantee that the system is mean-square exponentially stable with H∞ performance. The desired controller can be obtained by solving the obtained conditions. Simulation results show that guaranteed minimum H∞ performance γ=1.4037 and fast response of attitude for sampled-data autonomous airship are achieved in spite of the existence of parameter uncertainties.展开更多
文摘查诸汉英词典,发现成语“百足之虫,死而不僵”有如下英译: 《现代汉英词典》(外语教学与研究出版社,1988年11月第1版,p.15):a cenipede does topple over even when dead a centipede dies but never falls down; 《汉英常用熟语词典》(尹邦彦编,江苏教育出版社,1989年1月第1版,p.16):A centipede dies but never stiffens; 《汉英词典》(商务印书馆,1978年10月第1版,p.14):a centipede does not topple over even When dead; a centipede dies but never falls down;
基金Projects(51205253,11272205)supported by the National Natural Science Foundation of ChinaProject(2012AA7052005)supported by the National High Technology Research and Development Program of China
文摘A robust H∞ directional controller for a sampled-data autonomous airship with polytopic parameter uncertainties was proposed. By input delay approach, the linearized airship model was transformed into a continuous-time system with time-varying delay. Sufficient conditions were then established based on the constructed Lyapunov-Krasovskii functional, which guarantee that the system is mean-square exponentially stable with H∞ performance. The desired controller can be obtained by solving the obtained conditions. Simulation results show that guaranteed minimum H∞ performance γ=1.4037 and fast response of attitude for sampled-data autonomous airship are achieved in spite of the existence of parameter uncertainties.
