The distributed tracking control problem for heterogeneous multi-agent systems with unknown system dynamics is investigated.The objective is to provide a data-driven distributed tracking control protocol that ensures ...The distributed tracking control problem for heterogeneous multi-agent systems with unknown system dynamics is investigated.The objective is to provide a data-driven distributed tracking control protocol that ensures tracking performance between agents and the leader.To this end,the concept of data informativity for matching conditions is introduced.Then,the data-based sufficient and necessary conditions to achieve state tracking are provided.Meanwhile,a data-driven parameterisation approach for designing the distributed tracking control protocol is given.Compared with previous results,the reference input is considered in the leader's dynamics,and the computational burden is reduced by solving a set of data-based equations and inequality constraints rather than iteration.Additionally,the developed results are still appropriate for handling the tracking control issue of the single linear system,and the current constraint that the reference system be stable is eased.Finally,two simulation examples are given to verify the proposed schemes'effectiveness.展开更多
Initiated three decades ago,integrated design of controllers and fault detectors has continuously attracted research attention.The recent development of the unified control and detection framework with an observer-bas...Initiated three decades ago,integrated design of controllers and fault detectors has continuously attracted research attention.The recent development of the unified control and detection framework with an observer-based residual generator in its core gives a more general form of the previous works.Its applications to residual centred modelling of uncertain control systems,fault detection in feedback control systems with uncertainties,fault-tolerant control(FTC)as well as control performance degradation monitoring,detection and recovery are introduced.In conclusion,some future perspectives are proposed.展开更多
To promote the visualisation and informatisation of the construction process of precast foamed lightweight concrete wallboards(PFLCWs),from the analysis of the construction requirements of PFLCWs,three key constructio...To promote the visualisation and informatisation of the construction process of precast foamed lightweight concrete wallboards(PFLCWs),from the analysis of the construction requirements of PFLCWs,three key construction technologies based on building information modelling(BIM),namely,parameterised modelling for the PFLCW layout design,drawing generation to draw the PFLCW layout and quantity statistics for extracting PFLCW quantities,are proposed.Then,a reinforced concrete(RC)frame infilled with PFLCW is considered the test model to verify the feasibility of the aforementioned technologies.The results show that PFLCW layout design can be accomplished rapidly and visually using parameterised modelling technology.The PFLCW layout diagram can be generated directly using drawing generation technology.The proposed quantity statistics technology enables the automatic export of PFLCW bills of quantities.The built parameterised model helps construction workers rapidly and intuitively understand the specific layout details of PFLCWs.Moreover,the generated layout drawing and the bills of quantities based on the parameterised model can guide the production and on-site installation of PFLCWs.The research conclusions can serve as a practical guide and technical support for PFLCW engineering applications.展开更多
This paper provides a novel fault-tolerant control scheme for a class of nonaffine systems with nonlinearly parameterised(NLP)faults.The nonaffine system is firstly transformed into an augmented one via dynamic feedba...This paper provides a novel fault-tolerant control scheme for a class of nonaffine systems with nonlinearly parameterised(NLP)faults.The nonaffine system is firstly transformed into an augmented one via dynamic feedback control.A fault-tolerant controller with Immersion and Invariance(I&I)adaptation law is designed for the transformed system through dynamic surface control.The controller avoids complexity due to the explosion of terms in backstepping design.The I&I adaptation law is developed to recover the unknown parameters of NLP faults in the system.The proposed scheme can shape the transient performance of the parameter estimation error and tracking error.In the tracking problem,all the signals and tracking error converge exponentially to a small neighbourhood of the origin.In the regulation problem,the system output converges exponentially to zero.A numerical simulation is carried out to verify the effectiveness of the proposed scheme.展开更多
This paper aims to develop a generic optimisation method for Pelton turbine runners using computational fluid dynamics （CFD）. Two different initial runners are optimised to achieve more generic results. A simple buc...This paper aims to develop a generic optimisation method for Pelton turbine runners using computational fluid dynamics （CFD）. Two different initial runners are optimised to achieve more generic results. A simple bucket geometry based on existing bibliography is parameterised and initially optimised using fast Lagrangian solver （FLS）. It is then further optimised with a more accurate method using ANSYS Fluent. The second geometry is a current commercial geometry with good initial performance and is optimised using ANSYS CFX. The analytical results provided by CFX and Fluent simulations are used to analyse the characteristics of the flow for different runner geometries.展开更多
基金supported in part by the National Key Research and Development Program of China under Grant 2022YFB3304800the National Natural Science Foundation of China under Grant U21A20475,61873050+1 种基金the Fundamental Research Funds for the Central Universities under Grant N2304007the Research Fund of State Key Laboratory of Synthetical Automation for Process Industries under Grant 2018ZCX14.
文摘The distributed tracking control problem for heterogeneous multi-agent systems with unknown system dynamics is investigated.The objective is to provide a data-driven distributed tracking control protocol that ensures tracking performance between agents and the leader.To this end,the concept of data informativity for matching conditions is introduced.Then,the data-based sufficient and necessary conditions to achieve state tracking are provided.Meanwhile,a data-driven parameterisation approach for designing the distributed tracking control protocol is given.Compared with previous results,the reference input is considered in the leader's dynamics,and the computational burden is reduced by solving a set of data-based equations and inequality constraints rather than iteration.Additionally,the developed results are still appropriate for handling the tracking control issue of the single linear system,and the current constraint that the reference system be stable is eased.Finally,two simulation examples are given to verify the proposed schemes'effectiveness.
基金This work was supported by the National Natural Science Foundation of China(62020106003,62073029)the Beijing Natural Science Foundation(4202045)the Fundamental Research Funds for the Central Universities(FRF-TP-20-012A3).
文摘Initiated three decades ago,integrated design of controllers and fault detectors has continuously attracted research attention.The recent development of the unified control and detection framework with an observer-based residual generator in its core gives a more general form of the previous works.Its applications to residual centred modelling of uncertain control systems,fault detection in feedback control systems with uncertainties,fault-tolerant control(FTC)as well as control performance degradation monitoring,detection and recovery are introduced.In conclusion,some future perspectives are proposed.
基金The National Key Research and Development Program of China(No.2020YFD1100404-4)the National Natural Science Foundation for Young Scientists of China(No.52108120)the National Natural Science Foundation for Young Scientists of Jiangsu Province(No.BK20210258)。
文摘To promote the visualisation and informatisation of the construction process of precast foamed lightweight concrete wallboards(PFLCWs),from the analysis of the construction requirements of PFLCWs,three key construction technologies based on building information modelling(BIM),namely,parameterised modelling for the PFLCW layout design,drawing generation to draw the PFLCW layout and quantity statistics for extracting PFLCW quantities,are proposed.Then,a reinforced concrete(RC)frame infilled with PFLCW is considered the test model to verify the feasibility of the aforementioned technologies.The results show that PFLCW layout design can be accomplished rapidly and visually using parameterised modelling technology.The PFLCW layout diagram can be generated directly using drawing generation technology.The proposed quantity statistics technology enables the automatic export of PFLCW bills of quantities.The built parameterised model helps construction workers rapidly and intuitively understand the specific layout details of PFLCWs.Moreover,the generated layout drawing and the bills of quantities based on the parameterised model can guide the production and on-site installation of PFLCWs.The research conclusions can serve as a practical guide and technical support for PFLCW engineering applications.
基金supported by the Fundamental Research Funds for the Central Universities[grant number 2022YJS021][grant number 2022JBZY001]the National Natural Science Foundation of China[grant number 62371032].
文摘This paper provides a novel fault-tolerant control scheme for a class of nonaffine systems with nonlinearly parameterised(NLP)faults.The nonaffine system is firstly transformed into an augmented one via dynamic feedback control.A fault-tolerant controller with Immersion and Invariance(I&I)adaptation law is designed for the transformed system through dynamic surface control.The controller avoids complexity due to the explosion of terms in backstepping design.The I&I adaptation law is developed to recover the unknown parameters of NLP faults in the system.The proposed scheme can shape the transient performance of the parameter estimation error and tracking error.In the tracking problem,all the signals and tracking error converge exponentially to a small neighbourhood of the origin.In the regulation problem,the system output converges exponentially to zero.A numerical simulation is carried out to verify the effectiveness of the proposed scheme.
基金Lancaster University Renewable Energy Group and Fluid Machinery Groupthe Laboratory of Hydraulic Turbo Machines at the National Technical University of Athens+1 种基金Gilbert Gilkes and Gordon Ltdthe EU ERASMUS programme for the financial support
文摘This paper aims to develop a generic optimisation method for Pelton turbine runners using computational fluid dynamics （CFD）. Two different initial runners are optimised to achieve more generic results. A simple bucket geometry based on existing bibliography is parameterised and initially optimised using fast Lagrangian solver （FLS）. It is then further optimised with a more accurate method using ANSYS Fluent. The second geometry is a current commercial geometry with good initial performance and is optimised using ANSYS CFX. The analytical results provided by CFX and Fluent simulations are used to analyse the characteristics of the flow for different runner geometries.
