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Enhancing output performance of triboelectric nanogenerator by increasing charge storage capacity of electrodes

Nano Research 2025年第1期18卷 395-403页

作者： Congcong Hao Zekun Wang Mingzhe Cai Shuaining Cheng zhongxin Wang Cong Zhai Juan Cui Yongqiu Zheng Chenyang Xue Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education North University of ChinaTaiyuan 030051China

ABSTRACT:The practical application of rotating triboelectric nanogenerators is often limited by the wear of high-friction surface materials and low surface charge *** addition to the charge pump replenishment strategy,suppressing charge decay is also crucial for increasing surface charge ***,we present a high performance rotary triboelectric nanogenerator(HPR-TENG)based on a coplanar charge pumping strategy and polyvinyl chloride(PVC)*** has been demonstrated that applying PVC film to the surface of the storage electrode of the main TENG(M-TENG)significantly enhances the M-TENG’s output ***,the HPR-TENG with three layers of PVC film pasted achieved the best output performance,with a peak-topeak output voltage of 2828 V,a peak-to-peak output current of 327μA and a charge transfer of 0.81μC at 500 *** addition,the output improvement effects of different materials are *** TENG with 3 layers of PVC film pasted on it has a maximum output power of 748 mW at a load resistance of 4×10^(6)Ω.HPR-TENG’s output performance remains consistent after 100,000 cycles,which shows excellent *** excellent electrical performance of the HPR-TENG can be used as the energy supply for the tip high-voltage breakdown sensor system,which can achieve 14 breakdowns in 10 *** to its extraordinary electrical performance,HPRTENG can not only serve as an energy supply for cutting-edge high-voltage breakdown sensor systems,but also has the potential to serve as an energy supply for high-pressure sterilization,high-pressure vacuum and water electrolysis.

关键词： triboelectric nanogenerator coplanar charge pump enhancing charge density suppressing charge decay polyvinyl chloride(PVC)film

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ISOPARAMETRIC ELEMENT TRANSFORMATION FOR FINITE ANALYTIC METHOD

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Journal of Hydrodynamics 1992年第2期4卷 40-45页

作者： Gao, zhongxin Water Conservancy and Hydroelectric Power Research Inst Beijing China

Finite analytic method (FAM) is widely used to calculate high Reynolds number flow. However, on complex geometric domain this method must employ boundary-fitted coordinate transformation, which is difficult for some flow regions. In this paper, the isoparametric element was incorporated into the FAM. The flow region was subdivided into a number of small arbitary quadrilaterals and each element was transformed into a square element by the shape functions of isoparametric element. Then, the partial differential equations on the square element can be solved by FAM. Because this transformation is solely local, it is more flexible and convenient than the transformation on the whole domain. To illustrate this transformation, the two-dimensional incompressible viscous flow passing tube bundles has been calculated by this method.

关键词： Finite Element Method Mathematical Techniques Finite Element Method Mathematical Transformations

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The greedy crowd and smart leaders: a hierarchical strategy selection game with learning protocol

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Science China(Information Sciences) 2021年第3期64卷 193-206页

作者： Linghui GUO zhongxin LIU Zengqiang CHEN College of Artificial Intelligence Nankai University Tianjin Key Laboratory of Intelligent Robotics Nankai University

In this paper, a general resource distribution game with a hierarchical structure on the bipartite graph is proposed. In this system, the game is divided into two interacting levels, the agent level and the group level, with negotiations taking place on both levels. Each agent can belong to multiple groups,resulting in a system topology with a bipartite structure. On the agent level, decisions are based on the greedy principle, with the game being a state-based potential game. In contrast, some participants on the group level behave more "smartly" and are more likely to adopt a sophisticated strategy maximizing their personal interest. Strategies on both levels are based on distributed protocols, and the social welfare increases as the system approaches a Nash-equilibrium point. The designed protocols are theoretically analyzed from stability and efficiency. Furthermore, a reinforcement learning algorithm is introduced in the group level, where the smarter players are allowed to refine their strategies in the multi-step decision-making process by learning from historic game outcomes. In theory and according to simulations, agents with the learning behavior improve not only their personal interest but also the efficiency of the systemic resource distribution.

关键词： multi-agent system reinforcement learning game theory complex network bipartite graph

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EVENT-TRIGGERED AVERAGE-CONSENSUS OF MULTI-AGENT SYSTEMS WITH WEIGHTED AND DIRECT TOPOLOGY

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Journal of Systems Science & Complexity 2012年第5期25卷 845-855页

作者： zhongxin LIU Zengqiang CHEN Zhuzhi YUAN Department of Automation Nankai University

This paper investigates the average-consensus problem of multi-agent systems with direct and weighted topologies. Event-triggered control laws are adopted so as to reduce the frequency of individual control updating since the agents may be resource-limited in many real systems. The discrete time instants where the events are triggered are determined by a trigger function with respect to a certain measurement error. A centralized average-consensus protocol is proposed first for networks with fixed interaction topology, the stability and influencing factors of which are also analyzed. The design of trigger functions for networks with variable topology is also discussed. Then the results are extended to the decentralized counterpart, in which agents require only the information of their neighbors. Numerical examples are also provided that demonstrate the effectiveness of the theoretical results.

关键词： Average-consensus consensus digraph event-triggered control multi-agent system.

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Modeling and analysis of colored petri net based on the semi-tensor product of matrices

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Science China(Information Sciences) 2018年第1期61卷 70-85页

作者： Jiantao ZHAO Zengqiang CHEN zhongxin LIU College of Computer and Control Engineering Nankai University Key Laboratory of Intelligent Robotics of Tianjin Nankai University

This paper applies the model petri net method based on the semi-tensor product of matrices to colored petri net. Firstly, we establish the marking evolution equation for colored petri net by using the semitensor product of matrices. Then we define the concept of controllability and the control-marking adjacency matrix for colored petri net. Based on the marking evolution equation and control-marking adjacency matrix, we give the necessary and sufficient condition of reachability and controllability for colored petri net. The algorithm to verify the reachability of colored petri net is given, and we analyze the computational complexity of the algorithm. Finally, an example is given to illustrate the effectiveness of the proposed theory. The significance of the paper lies in the application of the model petri net method based on the semitensor product of matrices to colored petri net. This is a convenient way of verifying whether one marking is reachable from another one as well as finding all firing sequences between any two reachable ***, the method lays the foundations for the analysis of other properties of colored petri net.

关键词： colored petri net reachability controllability marking evolution equation semi-tensor product of matrices

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A novel matrix approach for the stability and stabilization analysis of colored Petri nets

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Science China(Information Sciences) 2019年第9期62卷 102-115页

作者： Jiantao ZHAO Zengqiang CHEN zhongxin LIU College of Computer and Control Engineering Nankai University Key Laboratory of Intelligent Robotics of Tianjin Nankai University

In this study, the stability and stabilization problem of a colored Petri net based on the semitensor product of matrices is investigated. First, the marking evolution equation of the colored Petri net in a Boolean algebra framework is established, and the necessary and sufficient condition for the stability of the equilibrium point of the colored Petri net is given. Then, the concept of the pre-k steps reachability set is defined and is used to study the problem of marking feedback stabilization. Some properties of the pre-k steps reachability set are developed. The condition of the stabilization of the colored Petri net is given. The algorithm of the optimal marking feedback controller is designed. The proposed method in this paper could judge the stability and stabilization of the colored Petri net by matrix approach. The obtained results are simple and easy to implement by computer. An example is provided to illustrate the effectiveness of the proposed method.

关键词： discrete event system colored Petri net semi-tensor product of matrices stability equilibrium point stabilization

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Event-Triggered Consensus for Multiple Nonholonomic Systems

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Journal of Systems Science & Complexity 2018年第5期31卷 1227-1243页

作者： LI Miao LIU zhongxin CHEN Zengqiang College of Computer and Control Engineering Nankai University Tianjin 300350 China Tianjin Key Laboratory of Intelligent Robotics Nankai University Tianjin 300350 China.

The paper investigates the consensus problem of multiple nonholonomic systems. Two event-triggered control strategies, one centralized and the other distributed, are developed, which can reduce the frequency of control updating. Under the proposed protocols, the multiple nonholonomic systems can achieve consensus, and the bound of inter-event time intervals is provided to illustrate that no Zeno behavior exists. Finally, numerical simulations are also provided to demonstrate the effectiveness of the proposed control strategies.

关键词： Consensus event-triggered control multiple nonholonomic systems.

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Semi-tensor product of matrices approach to reachability of finite automata with application to language recognition

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Frontiers of Computer Science 2014年第6期8卷 948-957页

作者： Yongyi YAN Zengqiang CHEN zhongxin LIU College of Computer and Control Engineering Nankai University Tianjin 300071 China College of Science Civil Aviation University of China Tianjin 300300 China

This paper investigates the transition function and the reachability conditions of finite automata by using a semitensor product of matrices, which is a new powerful matrix analysis tool. The states and input symbols are first expressed in vector forms, then the transition function is described in an algebraic form. Using this algebraic representation, a sufficient and necessary condition of the reachability of any two states is proposed, based on which an algorithm is developed for discovering all the paths from one state to another. Furthermore, a mechanism is established to recognize the language acceptable by a finite automaton. Finally, illustrative examples show that the results/algorithms presented in this paper are suitable for both deterministic finite automata （DFA） and nondeterministic finite automata （NFA）.

关键词： finite automata reachability analysis transition function expression matrix approach semi-tensor product

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Event-triggered fault-tolerant consensus control with control allocation in leader-following multi-agent systems

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Science China(Technological Sciences) 2021年第4期64卷 879-889页

作者： WANG XingXia LIU zhongxin CHEN ZengQiang College of Artificial Intelligence Nankai UniversityTianjin 300350China Key Laboratory of Intelligent Robotics of Tianjin Tianjin 300350China

Event-triggered consensus in leader-following multi-agent systems with actuator fault is considered in this paper, in which the fault investigated can be multiplicative fault and outage fault. An event-triggered mechanism is utilized to relieve the communication burden of the interconnected system. Then, control allocation is proposed to solve actuator fault in the multi-agent systems for the first time. Compared with the existing fault-tolerant methods, the proposed method can guarantee that the consensus errors converge to zero asymptotically without the traditional rank assumption. Meanwhile, the Zeno behavior of the event-triggered system is proved to be avoided. Simulation results are also provided to verify the effectiveness of the proposed method.

关键词： multi-agent systems fault-tolerant control consensus event-triggered mechanism control allocation optimal

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Leader-following consensus of second-order nonlinear multi-agent systems with intermittent position measurements

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Science China(Information Sciences) 2019年第10期62卷 117-132页

作者： Fuyong WANG zhongxin LIU Zengqiang CHEN College of Artificial Intelligence Nankai University Tianjin Key Laboratory of Intelligent Robotics Nankai University

This work studies the leader-following consensus problem of second-order nonlinear multi-agent systems with aperiodically intermittent position measurements. Through the filter-based method, a novel intermittent consensus protocol without velocity measurements is designed for each follower exclusively based on the relative position measurements of neighboring agents. Under the common assumption that only relative position measurements between the neighboring agents are intermittently used, some consensus conditions are derived for second-order leader-following multi-agent systems with inherent delayed nonlinear dynamics. Moreover, for multi-agent systems without inherent delayed nonlinear dynamics, some simpler consensus conditions are presented. Finally, some simulation examples are presented to verify and illustrate the theoretical results.

关键词： leader-following consensus second-order multi-agent system delayed nonlinear dynamics distributed filter intermittent measurements

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