This paper deals with analysis and synthesis problems of spatially interconnected systems where communicated information may get lost between subsystems. Spatial shift operator and temporal forward shift operator are ...This paper deals with analysis and synthesis problems of spatially interconnected systems where communicated information may get lost between subsystems. Spatial shift operator and temporal forward shift operator are introduced to model the interconnected systems as discrete time-space multidimensional linear systems with Markovian jumping parameters which reflect the state of communication channels. To ensure the whole system＇s well-posedness and mean square stability for a given packet loss rate, a condition is derived through analysis. Then a procedure of designing distributed dynamic output feedback controllers is proposed. The controllers have the same structure as the plants and are solved within the linear matrix inequality （LMI） framework. Finally, we apply these results to study the effect of communication losses on the multiple vehicle platoon control system, which further illustrates the effectiveness of the proposed model and method.展开更多
Unoccupied aircraft systems (UAS) are increasingly used to create spatial databases for use in natural resource research and in other disciplines. We describe our experience with the recovery of an UAS platform that b...Unoccupied aircraft systems (UAS) are increasingly used to create spatial databases for use in natural resource research and in other disciplines. We describe our experience with the recovery of an UAS platform that became lodged in a tree located next to a small river island after experiencing communication loss. The UAS platform was a DJI M200 series aircraft that we had used for remote sensing applications over several years without issue. During remote sensing of a riparian restoration project, the M200 descended vertically downward after communication loss, became lodged in a tree crown, and was suspended above the river. A tree climber was temporarily able to grasp the platform but a landing support released and the platform fell into the river. Although being submerged for less than 30 seconds, inspection of the internal chassis later revealed at least some moisture had infiltrated into the chassis likely impacting electrical components. The sensor escaped without noticeable damage and operated without apparent impact after being subjected to prolonged drying. We were unable to determine the specific reason for communication loss after examining digital flight logs but investigated other similar reported loss occurrences to better understand what may have transpired. We provide some recommendations for minimizing loss based on our analysis of reported incidents with similar UAS platforms and from our experiences in using UAS for remote sensing in forested environments.展开更多
In order to obtain an accurate state estimation of the operation in the combined heat and power system,it is necessary to carry out state estimation.Due to the limited information sharing among various energy systems,...In order to obtain an accurate state estimation of the operation in the combined heat and power system,it is necessary to carry out state estimation.Due to the limited information sharing among various energy systems,it is practical to perform state estimation in a decentralized manner.However,the possible communication packet loss is seldomly considered among various energy systems.This paper bridges this gap by proposing a relaxed alternating direction method of multiplier algorithm.It can also improve the computation efficiency compared with the conventional alternating direction of the multiplier algorithm.Case studies of two test systems are carried out to show the validity and superiority of the proposed algorithm.展开更多
文摘This paper deals with analysis and synthesis problems of spatially interconnected systems where communicated information may get lost between subsystems. Spatial shift operator and temporal forward shift operator are introduced to model the interconnected systems as discrete time-space multidimensional linear systems with Markovian jumping parameters which reflect the state of communication channels. To ensure the whole system＇s well-posedness and mean square stability for a given packet loss rate, a condition is derived through analysis. Then a procedure of designing distributed dynamic output feedback controllers is proposed. The controllers have the same structure as the plants and are solved within the linear matrix inequality （LMI） framework. Finally, we apply these results to study the effect of communication losses on the multiple vehicle platoon control system, which further illustrates the effectiveness of the proposed model and method.
文摘Unoccupied aircraft systems (UAS) are increasingly used to create spatial databases for use in natural resource research and in other disciplines. We describe our experience with the recovery of an UAS platform that became lodged in a tree located next to a small river island after experiencing communication loss. The UAS platform was a DJI M200 series aircraft that we had used for remote sensing applications over several years without issue. During remote sensing of a riparian restoration project, the M200 descended vertically downward after communication loss, became lodged in a tree crown, and was suspended above the river. A tree climber was temporarily able to grasp the platform but a landing support released and the platform fell into the river. Although being submerged for less than 30 seconds, inspection of the internal chassis later revealed at least some moisture had infiltrated into the chassis likely impacting electrical components. The sensor escaped without noticeable damage and operated without apparent impact after being subjected to prolonged drying. We were unable to determine the specific reason for communication loss after examining digital flight logs but investigated other similar reported loss occurrences to better understand what may have transpired. We provide some recommendations for minimizing loss based on our analysis of reported incidents with similar UAS platforms and from our experiences in using UAS for remote sensing in forested environments.
基金supported in part by the Key-Area Research and Development Program of Guangdong Province(No.2020B010166004)Guangdong Basic and Applied Basic Research Foundation(No.2019A1515011408)+2 种基金the Science and Technology Program of Guangzhou(No.201904010215)the Talent Recruitment Project of Guangdong(No.2017GC010467)the Fundamental Research Funds for the Central Universities
文摘In order to obtain an accurate state estimation of the operation in the combined heat and power system,it is necessary to carry out state estimation.Due to the limited information sharing among various energy systems,it is practical to perform state estimation in a decentralized manner.However,the possible communication packet loss is seldomly considered among various energy systems.This paper bridges this gap by proposing a relaxed alternating direction method of multiplier algorithm.It can also improve the computation efficiency compared with the conventional alternating direction of the multiplier algorithm.Case studies of two test systems are carried out to show the validity and superiority of the proposed algorithm.
