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Analysis of Actuator Rate Limit Effects on First-Order Plus Time-Delay systems under Fractional-Order Proportional-Integral Control

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IFAC-PapersOnLine 2018年第4期51卷 37-42页

作者： Yuan, Jie Chen, YangQuan Fei, Shumin School of Automation Southeast University Nanjing210096 China Mechatronics Embedded Systems and Automation Lab University of California MercedCA95343 United States Key Laboratory of Measurement and Control of CSE Ministry of Education School of Automation Southeast University Nanjing210096 China

Actuator rate limit deteriorates control performance, and may even lead to system instability in precision process control. In this paper, a first-order plus time-delay (FOPTD) system class with actuator rate limit is considered. The describing function (DF) of the rate limiter is derived to obtain the describing functions of the closed-loop and open-loop systems, and the onset frequency in the Nichols chart is used to analyze the rate limit effects in frequency domain. A fractional-order proportional-integral (FOPI) controller is first designed based on the flat phase constraint, crossover frequency, and phase margin specifications. Then a traditional integer-order PID (IOPID) controller is designed based on the same specifications to compare with the FOPI controller in the presence of actuator rate saturation. A careful simulation study is presented to validate all the conclusions. © 2018

关键词： Process control Actuators Controllers Delay control systems Describing functions Frequency domain analysis Proportional control systems Specifications System stability Time delay Timing circuits Two term control systems Control performance Cross over frequencies First order plus time delay First order plus time delay systems Fractional Order Proportional Integral (FOPI) Controller onset frequency Proportional integral control Rate saturation

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Fractional Decision Making Model for Crowds of Pedestrians in Two-Alternative Choice Evacuation

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IFAC-PapersOnLine 2017年第1期50卷 11764-11769页

作者： Cao, Ke-cai Zeng, CaiBin Chen, YangQuan Yue, Dong College of Automation Nanjing University of Posts and Telecommunications Nanjing210023 China School of Sciences South China University of Technology Guangzhou510640 China Mechatronics Embedded Systems and Automation Lab School of Engineering University of California MercedCA95343 United States

Modeling of the two-alternative decision making process for evacuation of crowds of pedestrians from bounded room has been considered in this paper under the framework of Calculus of Fractional Order. Dynamic decision making models of fractional order have been presented under symmetric interactions and asymmetric interactions, respectively. Stability analysis under asymmetric interactions has been studied using linear approximation. Final value of the collective opinion under asymmetric interactions is dependent on the initial distribution of crowd's opinions while it is not the case for symmetric interactions. Future work based on the results of this paper are also discussed at the end of this paper. © 2017

关键词： Decision making Beam plasma interactions Calculations Asymmetric interaction Decision making models Decision making process Dynamic decision making Evacuation of Crowds Fractional order Linear approximations Two Alternative Choice

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A class of anomalous diffusion epidemic models based on CTRW and distributed delay

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International Journal of Biomathematics 2023年第7期16卷 249-281页

作者： Zhenzhen Lu Guojian Ren Yangquan Chen Xiangyun Meng Yongguang Yu Department of Mathematics Beijing Jiaotong University Beijing 100044 P.R.China Mechatronics Embedded Systems and Automation LabUniversity of California Merced5200 North Lake Road MercedCA 95343USA

In recent years,the epidemic model with anomalous diffusion has gained popularity in the ***,when introducing anomalous diffusion into epidemic models,they frequently lack physical explanation,in contrast to the traditional reaction-diffusion epidemic *** point of this paper is to guarantee that anomalous diffusion systems on infectious disease spreading remain physically ***,based on the continuous-time random walk(CTRW),starting from two stochastic processes of the waiting time and the step length,time-fractional space-fractional diffusion,timefractional reaction-diffusion and fractional-order diffusion can all be naturally introduced into the SIR(S:susceptible,I:infectious and R:recovered)epidemic models,*** three models mentioned above can also be applied to create SIR epidemic models with generalized distributed time *** time delay systems can also be reduced to existing models,such as the standard SIR model,the fractional infectivity model and others,within the proper ***,as an application of the above stochastic modeling method,the physical meaning of anomalous diffusion is also considered by taking the SEIR(E:exposed)epidemic model as an *** methods can be used to build other types of epidemic models,including SIVRS(V:vaccine),SIQRS(Q:quarantined)and ***,this paper describes the transmission of infectious disease in space using the real data of COVID-19.

关键词： Continuous-time random walk time-fractional space-fractional diffusion time-fractional reaction-diffusion fractional-order diffusion distributed time delay

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Optimal control of a diffusion process using networked unmanned aerial systems with smart health

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IFAC Proceedings Volumes 2014年第3期47卷 1254-1259页

作者： Brandon Stark Sean Rider YangQuan Chen Mechatronics Embedded Systems and Automation Lab School of Engineering University of California Merced Merced CA USA

In many future applications, such as pesticide spraying, unmanned aerial systems (UASs) are expected to operate cooperatively in a swarm configuration. A cyber-physical framework based on Centroidal Voronoi Tessellations (CVT) has been shown to provide optimal placement for sensors or actuators and can be used effectively for the control of a diffusion process such as a pathogen infection. However, previous work did not consider real-world constraints such as the effect of the UASs health on swarm utilization. While health degradation over time is inevitable, mismanaged swarms face expedited health degradation from over-utilization of one UAS over others. In this paper, a novel smart health balancing (SHB) system is implemented to extend the life of the most heavily taxed UASs and thus extending the life of the entire UAS swarm. The effectiveness of the proposed system is demonstrated with simulation results.

关键词： Unmanned Aerial systems Precision Agriculture Networked Swarms UAS Applications Cyber-Physical System UAS Health Management

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Optimal pest management by networked unmanned cropdusters in precision agriculture: A cyber-physical system approach

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IFAC Proceedings Volumes 2013年第30期46卷 296-302页

作者： Brandon Stark Sean Rider YangQuan Chen Mechatronics Embedded Systems and Automation Lab School of Engineering University of California Merced Merced CA USA

Unmanned Aerial systems (UASs) are expected to see the largest application within the agricultural market. These versatile platforms have shown promise ushering in the next wave of precision agriculture. While remote sensing applications have been well documented and developed, there remains significant advances left to be made in improving the use of UASs for precision application of pesticides. Although the current mode of aerial spraying or application of pesticides within the U.S. is done using full-sized aircraft, future implementations for autonomous crop dusting are likely to utilize small unmanned aircraft systems (SUASs) due to their much lower cost and ease of use. However, these smaller platforms have limited payload capacities, thus the development of cooperative swarms of SUASs is necessary. In this paper, a swarm of cooperative SUASs are utilized within a cyber-physical system framework to optimize the use of pesticides with precision spraying. Through the use of Centroid Voronoi Tessellation, the swarm makes the most efficient use of pesticides to attack an invasive pathogen. Simulation results are presented to validate the performance of the proposed method.

关键词： Unmanned Aerial systems Precision Agriculture Networked Swarms UAS Applications Cyber-Physical System

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A Guide for Selecting Small Unmanned Aerial systems for Research-Centric Applications

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IFAC Proceedings Volumes 2013年第30期46卷 38-45页

作者： Brandon Stark Brendan Smith YangQuan Chen Mechatronics Embedded Systems and Automation Lab School of Engineering University of California Merced Merced CA USA

Unmanned Aerial systems (UASs) have been utilized in a wide variety of research-centric applications, especially within the last several years. However, the majority of these applications have utilized specialized equipment developed by experts in UAS technology. As the impact of using UASs for research applications become more widely known, the demand for their use will grow. Currently, the field of commercially available systems is growing larger every day, but many end-user researchers do not know how to utilize these systems for their needs. In this paper, an evaluation of many commercially available systems and typical payload systems is presented to help end-user researchers understand how to select the system that best suits their needs.

关键词： Unmanned Aerial System UAS Applications UAS Regulations UAS Payloads UAS Testbeds

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Ideal, Simplified and Inverted Decoupling of Fractional Order TITO Processes

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IFAC Proceedings Volumes 2014年第3期47卷 2897-2902页

作者： Zhuo Li YangQuan Chen MESA (Mechatronics Embedded Systems and Automation) Lab School of Engineering University of California Merced CA USA

In recent years, more and more research work has demonstrated the advantages of using fractional order modeling and control techniques. However, many of these research focus on the single-input-single-output systems. In this paper, fractional order two-input-two-output processes are studied in terms of decoupling control. Three types of classic decoupling techniques for integer order processes are re-visited and are generalized to fractional order cases, which has not been addressed in the literature. This effort involves new problems other than those for integer order processes, such as the the properness, interaction analysis, and the frequency dependent relative gain array, etc. Simulation examples are given to illustrate these generalized decoupling methodologies and some notes on practical implementation are provided.

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Challenges in water stress quantification using small unmanned aerial system (sUAS): Lessons from a growing season of almond

Challenges in water stress quantification using small unmann...

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2016 International Conference on Unmanned Aircraft systems, ICUAS 2016

作者： Zhao, Tiebiao Stark, Brandon Chen, Yangquan Q. Ray, Andrew L. Doll, David Mechatronics Embedded Systems and Automation Lab University of California MercedCA95343 United States Merced County 2145 Wardrobe Avenue MercedCA95341-6445 United States

ISBN: (纸本)9781467393331

With water shortages and drought affecting many regions of the world, it becomes urgent to increase water use efficiency (WUE) by optimizing irrigation schedule. Proper irrigation scheduling, which includes integrating of soil moisture monitoring, surface evapotranspiration loss calculation, and plant based measurements is required for high WUE. Stem water potential (SWP) has become one of the more common methods to measure water status. It is, however, labor intensive and time consuming, and adoption has been slow. This study aims to build the link between SWP and canopy normalized difference vegetation index (NDVI) based on aerial multi-spectral images and ground-truth measurement of an almond orchard. Data suggests that the correlation between SWP and canopy NDVI can be improved by tuning canopy NDVI threshold, as indicated by the coefficient of determination (R2). Also, NDVI shows good correlation with SWP in different growing stages - fruit development and post-harvest. Finally, it is demonstrated canopy NDVI distribution from different missions are significantly different, even if the interval between two flights is less than one hour. This poses the challenge that further calibration is needed to conduct quantitative measurement in long flight missions. Meanwhile, quantitative consideration of characteristic of bi-directional reflectance distribution function makes it necessary to obtain stable performance of canopy NDVI. © 2016 IEEE.

关键词： Antennas

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Fractional-order DOB-sliding mode control for a class of noncommensurate fractional-order systems with mismatched disturbances

Fractional-order DOB-sliding mode control for a class of non...

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作者： Wang, Jing Shao, Changfeng Chen, Xiaolu Chen, YangQuan College of Information Science and Technology Beijing University of Chemical Technology Beijing China Mechatronics Embedded Systems and Automation Lab School of Engineering University of California MercedCA United States

This article proposes a novel fractional-order sliding mode control based on the disturbance observer for a class of noncommensurate fractional-order systems with mismatched disturbances. Firstly, the noncommensurate fractional-order system is decomposed into several subsystems with commensurate order. Then the fractional-order disturbance observers are designed independently to estimate the mismatched disturbances for each subsystems. Based on the designed disturbance observers, a uniform fractional-order sliding mode control is proposed. The proposed method can deal with the mismatched disturbances and has better control performance. The simulations on single-link flexible manipulator system demonstrate the effectiveness of the proposed method. © 2019 John Wiley & Sons, Ltd.

关键词： Sliding mode control

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Preview Control Based on RIOTS MPC and H ∞ for A Thermal Hardware in the Loop System

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IFAC-PapersOnLine 2021年第20期54卷 729-734页

作者： Sina Dehghan Jairo Viola YangQuan Chen Mechatronics Embedded Systems Automation Lab (MESA Lab) Dept. of Mechanical Engineering Univ. of California Merced USA

This paper presents the implementation of a Model Predictive Control (MPC) algorithm with preview for temperature profile tracking. The MPC control with preview is implemented using RIOTS optimal problem control solver. The controller is contrasted against an H ∞ based preview controller. Obtained results shows that the MPC control with preview improves the system time response and control action compared to the classic preview control approach.

关键词： Preview control Model Predictive Control RIOTS MPC

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