9 results on '"Hu, Zhipei"'
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2. Synchronization of Complex Dynamical Networks Subject to Noisy Sampling Interval and Packet Loss.
- Author
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Hu, Zhipei, Ren, Hongru, and Shi, Peng
- Subjects
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SYNCHRONIZATION , *STOCHASTIC analysis , *DISTRIBUTION (Probability theory) , *NOISE measurement , *SAMPLING errors - Abstract
This article focuses on the sampled-data synchronization issue for a class of complex dynamical networks (CDNs) subject to noisy sampling intervals and successive packet losses. The sampling intervals are subject to noisy perturbations, and categorical distribution is used to characterize the sampling errors of noisy sampling intervals. By means of the input delay approach, the CDN under consideration is first converted into a delay system with delayed input subject to dual randomness and probability distribution characteristic. To verify the probability distribution characteristic of the delayed input, a novel characterization method is proposed, which is not the same as that of some existing literature. Based on this, a unified framework is then established. By recurring to the techniques of stochastic analysis, a probability-distribution-dependent controller is designed to guarantee the mean-square exponential synchronization of the error dynamical network. Subsequently, a special model is considered where only the lower and upper bounds of delayed input are utilized. Finally, to verify the analysis results and testify the effectiveness and superiority of the designed synchronization algorithm, a numerical example and an example using Chua’s circuit are given. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
3. Stabilization of Sampled-Data Systems With Noisy Sampling Intervals and Packet Dropouts via a Discrete-Time Approach.
- Author
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Hu, Zhipei, Ren, Hongru, Deng, Feiqi, and Li, Hongyi
- Subjects
- *
DISCRETE-time systems , *DISTRIBUTION (Probability theory) , *VANDERMONDE matrices , *STOCHASTIC systems , *KRONECKER products , *DATA packeting - Abstract
In real-world applications, sampled-data systems are often subject to undesirable physical constraints, which results in noisy sampling intervals that fluctuate around an ideal sampling period based on certain probability distribution. In the presence of noisy sampling intervals, this article is concerned with the stabilization problem for a class of sampled-data systems with successive packet dropouts. First, the relationship between two adjacent update times of zero-order hold is established. Then, by discrete-time approach, an equivalent discrete-time stochastic system is introduced. By the law of total expectation, together with confluent Vandermonde matrix, convolution formula, and Kronecker product operation, the mathematical expectation of a product of three matrices, including the system matrix and its transpose, is calculated. Based on this, a stabilization controller is designed such that the closed-loop system is stochastically stable. Finally, an illustrative example is provided to verify the effectiveness of the proposed design approach. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
4. Control of Discrete-Time Stochastic Systems With Packet Loss by Event-Triggered Approach.
- Author
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Hu, Zhipei, Shi, Peng, Zhang, Jin, and Deng, Feiqi
- Subjects
- *
STOCHASTIC systems , *DISCRETE-time systems , *BINOMIAL distribution , *EXPONENTIAL stability , *MATHEMATICAL analysis - Abstract
Event-triggered schemes are characterized in less communication traffic while maintaining the resulting controlled plant’s desired stability and performance criteria. In the presence of packet dropouts, this paper is concerned with the modeling and control problems for a class of discrete-time stochastic systems with event-triggered schemes. Two different mathematical analysis methods are proposed to model the packet loss when an event-triggered scheme is subject to packet loss. First, a stochastic distributed sequence satisfying the Bernoulli process is utilized to model the triggered packets transmitted in the communication networks. Considering the difference between time-triggered and event-triggered schemes, an equivalent model with a random sequence not satisfying a Bernoulli distribution process is also analyzed, which is not the same as some existing results in the literature. Then, the mean-square exponential stability of resulting augmented system is guaranteed and the prescribed ${H}_{\infty }$ performance level is achieved by solving resulting discrete ${P}$ -problem. Two examples with simulations are provided to validate the analytical results and demonstrate the effectiveness of the proposed co-design techniques. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
5. A New Approach to Characterize Successive Packet Losses in Stochastic Networked Systems.
- Author
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Hu, Zhipei, Deng, Feiqi, Shi, Peng, and Lim, Cheng-Chew
- Subjects
- *
STOCHASTIC systems , *CLOSED loop systems , *STOCHASTIC processes , *DISCRETE-time systems , *PROBABILITY theory , *ASYMPTOTIC distribution , *GLOBAL asymptotic stability - Abstract
In this paper, we discuss the modeling and stabilization problems for a class of discrete-time stochastic networked systems (DSNSs) subject to successive packet losses. The system under consideration is transformed into a stochastic one with bounded stochastic delay. Considering that the stochastic delay is characterized by nonuniform distribution, a new equivalent model is then constructed that enables the DSNS’s controller design to benefit from knowing the probability characteristic of packet losses. Specially, to verify this feature, the probabilities of the delay can be explicitly obtained by utilizing the formula of total probability, which is critical to model transformation and analyze practical problems that exist in DSNSs. Based on the proposed model, sufficient conditions are established under which the globally mean-square asymptotic stability of resulting stochastic delay closed-loop system is guaranteed, and a delay-distribution-dependent design procedure is then proposed. A numerical example with simulation is provided to validate the analytical results and demonstrate the effectiveness of the design procedure. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
6. Modeling and Control of It? Stochastic Networked Control Systems With Random Packet Dropouts Subject to Time-Varying Sampling.
- Author
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Hu, Zhipei, Deng, Feiqi, Xing, Mali, and Li, Junhui
- Subjects
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STOCHASTIC systems , *STOCHASTIC processes , *TIME-varying systems , *CONTINUOUS time systems , *LINEAR systems - Abstract
In this note, we discuss the modeling and control of a class of Itô stochastic networked control systems (NCSs) with packet dropouts that are subject to time-varying sampling. The system under consideration is first modeled as a continuous-time system with input delay that is subject to double randomness via the input-delay approach. Then, by assuming the packet drop rate and recurring to the celebrated formula of total probability, an equivalent model which takes full advantage of probability distribution characteristics of both packet dropouts and sampling periods is established. In particular, the probability distribution values of the stochastic delay taking values in two given intervals can be explicitly obtained, which is of crucial importance to model and analyze the actual problem in NCSs. Based on that, robustly exponentially mean-square stability of the system with an $H_\infty$ performance is guaranteed, an $H_\infty$ controller design procedure is then proposed. Finally, a numerical simulation example is exploited to show the effectiveness and applicability of the results derived and some less conservative results are obtained. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
7. Sampled-Data Consensus for Multiagent Systems With Time Delays and Packet Losses.
- Author
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Xing, Mali, Deng, Feiqi, and Hu, Zhipei
- Subjects
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MULTIAGENT systems , *RICCATI equation , *STABILITY theory , *LYAPUNOV stability , *ALGEBRAIC equations - Abstract
This paper considers the sample-data-based consensus problem of multiagent systems with time-varying delay and packet losses. To distinguish the time delays caused by network-induced time-delay and packet losses, the switched system is utilized. A lower gain controller is designed based on the solution of a parametric algebraic Riccati equation. The Lyapunov stability theory is utilized to obtain the limitations on the frequency and the duration of packet losses which guarantees the consensus of multiagent systems. On the other hand, we theoretically prove that refined time-delay function can reduce the conservatism. A simulation example is given to illustrate the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
8. Experimental study on thermal performance of high absorption latent heat storage plate (LHSP) in greenhouse.
- Author
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Meng, Erlin, Zhao, Junpeng, Tian, Ruian, Hu, Zhipei, Li, Jun, Zhou, Bo, Wang, Chenyang, and Zhao, Haiqian
- Subjects
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HEAT storage , *HEAT radiation & absorption , *LATENT heat , *PHASE change materials , *GREENHOUSES - Abstract
Phase change material (PCM) can effectively reduce temperature fluctuations in greenhouses and increase crop yields. Plastic greenhouses are a major form of facility agriculture in southern China, and there are no walls in it. Therefore, how to combine plastic greenhouses with PCM has become research hotspot. A new type of high absorption latent heat storage plate (LHSP) was proposed. That is to lay PCM plates on the north side of the plastic greenhouse vertically. To enhance solar energy utilization and reduce heat loss, solar high absorption and thermal insulation layer were respectively placed on the sunny side and shady side. Two greenhouses were constructed and LHSP was placed in one greenhouse as Case 1. After that, a solar high absorption film and thermal insulation layer were attached to the sunny side and the shady side as Case 2 and Case 3. The average air temperature of two greenhouses and the thermal performance of LHSP were compared under three cases. Results showed that, in Case 1, the LHSP can raise the average air temperature inside the greenhouse by 1.8–2.9 °C during the night. in Case 2 and 3, the average air temperature had a stable improvement of 1.6–2.2 °C and 1.8–2.1 °C respectively at night. Besides, in Case 2, the heat storage of LHSP on sunny side had increased by 26.2%. In Case 3, the total average heat loss of LHSP was reduced by 21.5% and the average heat release from sunny side had risen by up to 39.7%. The high absorption latent heat storage plate showed excellent thermal performance. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
9. Strategies for promoting the degradation of phenol by electro-Fenton: Simultaneously promoting the generation and utilization of H2O2.
- Author
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Zhang, Zhuangzhuang, Zhao, Haiqian, Wang, Zhonghua, Hu, Zhipei, Wang, Qingshu, Meng, Erlin, Lai, Shiwei, Ying, Jiaxin, Li, Hongguang, and Wu, Chuanyan
- Subjects
- *
PHENOL , *ACTIVATED carbon , *POLLUTANTS , *DENSITY functional theory - Abstract
The use of the electro-Fenton process to continuously generate H 2 O 2 and efficiently degrade organic pollutants is considered a promising technology. The ratio of generation of H 2 O 2 is usually regarded as the critical step; however, how the H 2 O 2 is utilized is also of particular importance. Herein, activated carbon was activated at different temperatures and used to explore the effect of nitrogen doping on the production and utilization of H 2 O 2 in the electro-Fenton-based degradation of organic pollutants. The experimental results indicate that nitrogen-doped activated carbon simultaneously promotes the generation and utilization of H 2 O 2 , which is attributed to the regulation of the competition between phenol and O 2 adsorption by the doped nitrogen. Nitrogen doping not only improves 2e−ORR selectivity but also aggregates phenol near the cathode to balance the concentrations of phenol and ·OH. Density functional theory (DFT) calculations further confirmed that pyrrole-N as a dopant promoted the adsorption of phenol, while pyridine-N was more favorable for O 2 adsorption. The unique balance of nitrogen types possessed by modified activated carbon NAC-750 permits the efficient synergistic generation and utilization of H 2 O 2 in a balanced manner during the degradation of phenol. This work provides a new direction for the rational nitrogen-doping modification of activated carbon for the electro-Fenton-based degradation of organic pollutants. [Display omitted] • The adsorption of phenol affects the adsorption of O 2 and the generation of H 2 O 2. • Graphite-N is the main site for the competitive adsorption of phenol and O 2. • Competition can be effectively regulated by regulating nitrogen doping types. • Reasonable nitrogen doping can promote the generation and utilization of H 2 O 2. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
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