为提高用于数控机床的电励磁直线同步电机(electrically excited linear synchronous motor,EELSM)电流控制器的动态性能,克服其存在的参数时变性,建立EELSM非线性状态空间模型并分解为电磁子模型与机电子模型。以EELSM电磁子模型为被...为提高用于数控机床的电励磁直线同步电机(electrically excited linear synchronous motor,EELSM)电流控制器的动态性能,克服其存在的参数时变性,建立EELSM非线性状态空间模型并分解为电磁子模型与机电子模型。以EELSM电磁子模型为被控对象,设计模型跟随电流控制器,将该控制器与具有比例积分自适应调节规律的自适应机构组成电流控制闭环系统。采用非线性孤立方法将闭环系统等价为一个线性正向定常环节和一个非线性反馈环节,依据波波夫超稳定性理论,设计等价线性正向环节传递函数矩阵严格正实,设计非线性反馈环节满足波波夫积分不等式,可使闭环系统稳定且其状态变量收敛。数值仿真得到闭环系统的参考模型与被控对象的状态变量的时域阶跃响应曲线,计算机仿真结果表明EELSM的模型参考自适应电流控制系统具有渐近超稳定性和全局收敛性。展开更多
IN model theory, Zil’ ber has proved that any model of nontrivial -categorical theory is verysimilar to a module or field. So some people wanted to prove the famous Vaught’s conjec-ture for superstable theories of m...IN model theory, Zil’ ber has proved that any model of nontrivial -categorical theory is verysimilar to a module or field. So some people wanted to prove the famous Vaught’s conjec-ture for superstable theories of modules. Later, Buechler proved that the Vaught’s conjectureis true for the theories of modules with Morley rank 1. In order to reduce Vaught’s conjec-ture for superstablc theories of modules, Prest suggested discussing the preservation of stabili-ty--theory properties of modules when the underlying ring of the modules changes. Zieglergave some preservation theorems of clementary properties of the theory of modules in ref.展开更多
文摘为提高用于数控机床的电励磁直线同步电机(electrically excited linear synchronous motor,EELSM)电流控制器的动态性能,克服其存在的参数时变性,建立EELSM非线性状态空间模型并分解为电磁子模型与机电子模型。以EELSM电磁子模型为被控对象,设计模型跟随电流控制器,将该控制器与具有比例积分自适应调节规律的自适应机构组成电流控制闭环系统。采用非线性孤立方法将闭环系统等价为一个线性正向定常环节和一个非线性反馈环节,依据波波夫超稳定性理论,设计等价线性正向环节传递函数矩阵严格正实,设计非线性反馈环节满足波波夫积分不等式,可使闭环系统稳定且其状态变量收敛。数值仿真得到闭环系统的参考模型与被控对象的状态变量的时域阶跃响应曲线,计算机仿真结果表明EELSM的模型参考自适应电流控制系统具有渐近超稳定性和全局收敛性。
文摘IN model theory, Zil’ ber has proved that any model of nontrivial -categorical theory is verysimilar to a module or field. So some people wanted to prove the famous Vaught’s conjec-ture for superstable theories of modules. Later, Buechler proved that the Vaught’s conjectureis true for the theories of modules with Morley rank 1. In order to reduce Vaught’s conjec-ture for superstablc theories of modules, Prest suggested discussing the preservation of stabili-ty--theory properties of modules when the underlying ring of the modules changes. Zieglergave some preservation theorems of clementary properties of the theory of modules in ref.
