In this paper we consider the first order discrete Hamiltonian systems {x1（n＋1）-x1（n）=Hx2（n,x（n））,x2（n）-x2（n-1）=Hx1（n,x（n））,where x（n） = （x2（n）x1（n））∑ R^2N, H（n,z） = 1/2S（n）z. z ＋ R（n,z...In this paper we consider the first order discrete Hamiltonian systems {x1（n＋1）-x1（n）=Hx2（n,x（n））,x2（n）-x2（n-1）=Hx1（n,x（n））,where x（n） = （x2（n）x1（n））∑ R^2N, H（n,z） = 1/2S（n）z. z ＋ R（n,z） is periodic in n and superlinear as {z} →4 ∞. We prove the existence and infinitely many （geometrically distinct） homoclonic orbits of the system by critical point theorems for strongly indefinite functionals.展开更多
The paper reveals the relation between the linear AND-OR gate and the emitter function logic. With theoretic calculation and PSPICE simulation, the paper proves that the linear AND-OR gates can work at super-high-spee...The paper reveals the relation between the linear AND-OR gate and the emitter function logic. With theoretic calculation and PSPICE simulation, the paper proves that the linear AND-OR gates can work at super-high-speed and can be multi-cascaded. On the basis of analyzing the high-speed switch units which coordinate with linear AND-OR gates, two kinds of emitter coupled logic circuits are designed. The paper also discusses the design principles of super-high-speed digital circuits, and some examples of combinational and sequential circuits using linear AND-OR gate are given.展开更多
永磁同步直线电机(permanent magnet linear synchronous motor,PMLSM)凭借直接将电能转化为直线运动、无机械传动结构的特性,在高端装备制造中应用广泛。然而,传统矢量控制存在动态响应和稳态精度不足的问题,难以满足复杂工况下的高性...永磁同步直线电机(permanent magnet linear synchronous motor,PMLSM)凭借直接将电能转化为直线运动、无机械传动结构的特性,在高端装备制造中应用广泛。然而,传统矢量控制存在动态响应和稳态精度不足的问题,难以满足复杂工况下的高性能位置控制需求。滑模控制作为一种强鲁棒性的非线性控制方法,可有效抑制PMLSM系统中的参数摄动、摩擦扰动和负载突变等非线性因素影响。考虑PMLSM多变量、强耦合和受非线性因素影响大的特点,对PMLSM位置滑模控制策略展开综述,分析其核心原理与实现机制,探讨不同滑模控制方法的特性与进展,为提升PMLSM位置控制精度和鲁棒性提供理论参考,助推其在高端装备制造等领域的进一步应用与发展。展开更多
基金CHEN WenXiong supported by Science Foundation of Huaqiao UniversityYANG Minbo was supported by Natural Science Foundation of Zhejiang Province (Grant No. Y7080008)+1 种基金YANG Minbo was supported by National Natural Science Foundation of China (Grant No. 11101374, 10971194)DING Yanheng was supported partially by National Natural Science Foundation of China (Grant No. 10831005)
文摘In this paper we consider the first order discrete Hamiltonian systems {x1（n＋1）-x1（n）=Hx2（n,x（n））,x2（n）-x2（n-1）=Hx1（n,x（n））,where x（n） = （x2（n）x1（n））∑ R^2N, H（n,z） = 1/2S（n）z. z ＋ R（n,z） is periodic in n and superlinear as {z} →4 ∞. We prove the existence and infinitely many （geometrically distinct） homoclonic orbits of the system by critical point theorems for strongly indefinite functionals.
基金Supported by the National Natural Science Foundation of China
文摘The paper reveals the relation between the linear AND-OR gate and the emitter function logic. With theoretic calculation and PSPICE simulation, the paper proves that the linear AND-OR gates can work at super-high-speed and can be multi-cascaded. On the basis of analyzing the high-speed switch units which coordinate with linear AND-OR gates, two kinds of emitter coupled logic circuits are designed. The paper also discusses the design principles of super-high-speed digital circuits, and some examples of combinational and sequential circuits using linear AND-OR gate are given.
文摘永磁同步直线电机(permanent magnet linear synchronous motor,PMLSM)凭借直接将电能转化为直线运动、无机械传动结构的特性,在高端装备制造中应用广泛。然而,传统矢量控制存在动态响应和稳态精度不足的问题,难以满足复杂工况下的高性能位置控制需求。滑模控制作为一种强鲁棒性的非线性控制方法,可有效抑制PMLSM系统中的参数摄动、摩擦扰动和负载突变等非线性因素影响。考虑PMLSM多变量、强耦合和受非线性因素影响大的特点,对PMLSM位置滑模控制策略展开综述,分析其核心原理与实现机制,探讨不同滑模控制方法的特性与进展,为提升PMLSM位置控制精度和鲁棒性提供理论参考,助推其在高端装备制造等领域的进一步应用与发展。
基金supported by China Postdoctoral Science Foundation(2015M582355)the Doctor Scientific Research Start Project from Hubei University of Science and Technology(BK1418)National Natural Science Foundation of China(61271256)
