Static group synchronization of second-order multi-agent systems via pinning control

This paper investigates the expected static group synchronization problem of the second-order multi-agent systems via pinning control. For directed communication topology with spanning tree, based on Gershgorin disk theorem and the matrix property, a static pinning control protocol with fixed gains is first introduced and some sufficient and necessary static group synchronization criteria are also established. It is worth mentioning that a rigorous proof is also given that only one pinning node is needed to guarantee static group synchronization, which could be inferred that our protocol might be more economical and effective in large scale of multi-agent systems. Then, for weakly connected directed communication topology with nodes of zero in-degree, an adaptive pinning control applied to the node with zero in-degree is also proposed to achieve static group synchronization. Finally, the efficiency of the proposed protocols is verified by two simulation examples.     

Model free adaptive iterative learning control for a class of nonlinear systems with randomly varying iteration lengths

This paper proposes a novel model free adaptive iterative learning control scheme for a class of unknown nonlinear systems with randomly varying iteration lengths. By applying the dynamic linearization technique along the iteration axis, such systems can be transformed into iteration-depended time varying linear systems. Then, an improved model free adaptive iterative learning control scheme can be constructed only using input and output data of the system. From the rigorous theoretical analysis, it is shown that the mathematical expectation of tracking errors converge to zero as iteration increases. This design does not require any dynamic information of the ILC systems and prior information of randomly varying iteration lengths. An illustrative example verifies the effectiveness of the proposed design.     

A cyclic pursuit framework for networked mobile agents based on vector field approach

This paper proposes a pursuit formation control scheme for a network of double-integrator mobile agents based on a vector field approach. In a leaderless architecture, each agent pursues another one via a cyclic topology to achieve a regular polygon formation. On the other hand, the agents are exposed to a rotational vector field such that they rotate around the vector field centroid, while they keep the regular polygon formation. The main problem of existing approaches in the literature for cyclic pursuit of double-integrator multiagent systems is that under those approaches, the swarm angular velocity and centroid are not controllable based on missions and agents capabilities. However, by employing the proposed vector field approach in this paper, while keeping a regular polygon formation, the swarm angular velocity and centroid can be determined arbitrary. The obtained results can be extended to achieve elliptical formations with cyclic pursuit as well. Simulation results for a team of eight mobile agents verify the accuracy of the proposed control scheme.     

Output regulation for a class of positive switched systems

In this paper, a complete procedure for the study of the output regulation problem is established for a class of positive switched systems utilizing a multiple linear copositive Lyapunov functions scheme. The feature of the developed approach is that each subsystem is not required to has a solution to the problem. Moreover, two types of controllers and switching laws are devised. The first one depends on the state together with the external input and the other depends only the error. The conditions ensuring the solvability of the problem for positive switched systems are presented in the form of linear matrix equations plus linear inequalities under some mild constraints. Two examples are finally given to show the performance of the proposed control strategy.     

Observer-based decentralized control of large-scale stochastic high-order feedforward systems with multi time delays

This paper investigates the problem of observer-based decentralized control for a class of large-scale stochastic high-order feedforward systems with multi time delays. By using the homogeneous domination idea and constructing the implementable observer, the decentralized output-feedback controller design scheme is firstly proposed. Then, with the aid of stochastic time delay system stability theory, the globally asymptotically stable in probability of the closed-loop system is verified by selecting an appropriate Lyapunov–Krasoviskii functional. Finally, an example is provided to demonstrate the efficiency of the proposed design method.     

新工科背景下基于“互联网+”慕课教学在高校《化工设备机械基础》教学中的应用

随着产业升级步伐的加快,新产业新技术的不断出现,同时对人才培养提出了新的挑战,化工专业作为一个传统的学科,更应该适应传统化工转型升级的需要,加快培养模式的转变,使高校化工教育与社会需求更好地衔接。     

对日本冈山大学图学教育状况的思考

本文介绍了日本冈山大学制图课的教学状况,进而论述了相应得借鉴意义。     

高职房建专业教学改革的研究与实践

我校房屋建筑工程专业于 1997年开始进行教学改革 ,以“双纲”、“双轨”、“双师”为指导思想 ,在培养目标、教学计划、课程体系、实训基地、师资建设等方面进行了探讨和实践 ,初步形成了具有高职教育特色的教学模式     

生物反应工程教学改革研究与实践

结合生物反应工程的学科特点,在精选教学內容、改革教学方法以及加强实验教学方面进行了探索,使学习內容具有开放性,有利于提高学生主动学习的兴趣,因材施教,使教学过程成为思维方法、分析能力的训练和培养过程,使学生能利用所学知识去认识规律、运用规律,培养学生工程分析能力,以适应新世纪人才培养模式对人才素质的要求.     

与职业技能鉴定相结合的工程制图课程体系改革

工程制图教学和考试与国家职业技能鉴定一中级制图员水平考试相结合,推动工程制图课程体系全面改革,促进制图教学与计算机绘图紧密结合,使高等职业以学生能力为本的教育特色真正体现在每个学生身上。