空间电磁对接具有不消耗推进剂、连续可逆控制能力和无羽流污染等优点,应用前景广阔。空间电磁对接控制难点在于强非线性、不确定性以及耦合性等问题。为此,论文综合采用线性扩张状态观测器(LESO,Line Extended State Observer)、反馈...空间电磁对接具有不消耗推进剂、连续可逆控制能力和无羽流污染等优点,应用前景广阔。空间电磁对接控制难点在于强非线性、不确定性以及耦合性等问题。为此,论文综合采用线性扩张状态观测器(LESO,Line Extended State Observer)、反馈线性化以及鲁棒H∞控制技术,设计空间电磁对接的鲁棒协调控制,并通过仿真检验所设计控制方案的性能及其鲁棒性。仿真结果表明,所设计的控制器不但可以观测到系统所有状态变量,而且能提高系统对模型不确定性以及外界干扰的鲁棒性,跟踪控制性能良好。展开更多
Symmetric laminated plates used usually are anisotropic plates. Based on the fundamental equation for anisotropic rectangular plates in plane stress problem, a general analytical solution is established accurately by ...Symmetric laminated plates used usually are anisotropic plates. Based on the fundamental equation for anisotropic rectangular plates in plane stress problem, a general analytical solution is established accurately by method of stress function. Therefore the general formula of stress and displacement in plane is given. The integral constants in general formula can be determined by boundary conditions. This general solution is composed of solutions made by trigonometric function and hyperbolic function, which can satisfy the problem of arbitrary boundary conditions along four edges, and the algebraic polynomial solutions which can satisfy the problem of bonndary conditions at four corners. Consequently this general solution can be used to solve the plane stress problem with arbitrary boundary conditions. For example, a symmetric laminated square plate acted with uniform normal load, tangential load and nonuniform normal load on four edges is calculated and analyzed.展开更多
文摘空间电磁对接具有不消耗推进剂、连续可逆控制能力和无羽流污染等优点,应用前景广阔。空间电磁对接控制难点在于强非线性、不确定性以及耦合性等问题。为此,论文综合采用线性扩张状态观测器(LESO,Line Extended State Observer)、反馈线性化以及鲁棒H∞控制技术,设计空间电磁对接的鲁棒协调控制,并通过仿真检验所设计控制方案的性能及其鲁棒性。仿真结果表明,所设计的控制器不但可以观测到系统所有状态变量,而且能提高系统对模型不确定性以及外界干扰的鲁棒性,跟踪控制性能良好。
基金Project supported by the National Natural Science Foundation of China (No.19872072)
文摘Symmetric laminated plates used usually are anisotropic plates. Based on the fundamental equation for anisotropic rectangular plates in plane stress problem, a general analytical solution is established accurately by method of stress function. Therefore the general formula of stress and displacement in plane is given. The integral constants in general formula can be determined by boundary conditions. This general solution is composed of solutions made by trigonometric function and hyperbolic function, which can satisfy the problem of arbitrary boundary conditions along four edges, and the algebraic polynomial solutions which can satisfy the problem of bonndary conditions at four corners. Consequently this general solution can be used to solve the plane stress problem with arbitrary boundary conditions. For example, a symmetric laminated square plate acted with uniform normal load, tangential load and nonuniform normal load on four edges is calculated and analyzed.
