Passive robust control for uncertain Hamiltonian systems by using operator theory

In this study,the passivity-based robust control and tracking for Hamiltonian systems with unknown perturbations by using the operator-based robust right coprime factorisation method is concerned.For the system with unknown perturbations,a design scheme is proposed to guarantee the uncertain non-linear systems to be robustly stable while the equivalent non-linear systems is passive,meanwhile the asymptotic tracking property of the plant output is discussed.Moreover,the design scheme can be also used into the general Hamiltonian systems while the simulation is used to further demonstrate the effectiveness of the proposed method.

Robust Control for Uncertain Nonlinear Feedback Systems Using Operator-based Right Coprime Factorization

The robust control issue for uncertain nonlinear system is discussed by using the method of right coprime factorization. As it is difficult to obtain the inverse of the right factor due to the high nonlinearity, the proving of the Bezout identity becomes troublesome. Therefore, two sufficient conditions are derived to manage this problem with the nonlinear feedback system as well as that with the uncertain nonlinear feedback system under the definition of Lipschitz norm. A simulation of temperature control is given to demonstrate the validity of the proposed method.

中甸牦牛季节性体重变化动态分析

目的:牦牛作为青藏高原的主要畜种之一,但每年却要面对严冬和长达7.5个月的枯草期,期间一直处于半饥饿状态,掉膘严重,有的甚至因饥饿而死亡。通过对中甸牦牛体重监测,揭示掉膘的程度,为冷季补饲和短期育肥提供理论依据。方法:对一年中不同时间点的中甸牦牛体重监测,比较分析不同季节的掉膘情况。结果:调查发现,11月份中甸牦牛膘力最好,5月份体重最轻,成年公牛(含阉牛)体重分别为315.8±59.1 kg和209.5±66.3 kg,母牛体重分别为210.5±33.8 kg和148.7±20.2 kg,相对体重掉膘分别为33.7%和29.4%。在一般营养水平下,圈养1~4岁中甸牦牛(7-11月),公母牛体重分别可到207 kg和187 kg;体重大的个体采食能力更强,增重更快,母牛体重已达到成年体重,架子还不到成年状态,圈养期的平均日增重为600 g,每头牛可盈利近1000元,效益较好。结论:必须做好饲草料种植和储备,以应对冬春季节严重掉膘的情况;中甸牦牛短期圈养育肥可获得较好的经济效益,值得持续试验示范。