【摘要】：網(wǎng)絡(luò)控制系統(tǒng)是近年來(lái)控制界的學(xué)術(shù)熱點(diǎn)研究方向。在NCS中,分布在不同物理區(qū)域的網(wǎng)絡(luò)節(jié)點(diǎn)之間通過(guò)實(shí)時(shí)通信網(wǎng)絡(luò)連接形成分布式閉環(huán)控制系統(tǒng)。NCS作為一種分布式計(jì)算機(jī)控制系統(tǒng),在系統(tǒng)的建模、分析和設(shè)計(jì)中必然會(huì)涉及到信號(hào)的采樣、保持等問(wèn)題;另一方面,多個(gè)回路以共享網(wǎng)絡(luò)通信資源的方式進(jìn)行控制,如何減少冗余信息的傳輸、提高有限網(wǎng)絡(luò)帶寬的利用率顯得相當(dāng)重要。在網(wǎng)絡(luò)控制系統(tǒng)的分析與設(shè)計(jì)當(dāng)中,采樣周期大小的選擇既可影響系統(tǒng)的控制性能,又可反映數(shù)據(jù)信號(hào)在網(wǎng)絡(luò)上的傳輸狀況。目前的研究成果多是基于固定周期采樣的方式,這種采樣方式盡管利于建模并簡(jiǎn)化系統(tǒng)分析,但不切合實(shí)際甚至?xí)斐删W(wǎng)絡(luò)資源的浪費(fèi)�？紤]到網(wǎng)絡(luò)控制系統(tǒng)的本質(zhì)特征,本文工作主要包含如下兩個(gè)方面:一方面,根據(jù)通信網(wǎng)絡(luò)中數(shù)據(jù)信息的時(shí)變特性,進(jìn)行時(shí)變采樣周期網(wǎng)絡(luò)控制系統(tǒng)的研究。在這方面的工作有兩點(diǎn):其一,研究有界時(shí)變時(shí)延的變采樣周期網(wǎng)絡(luò)控制系統(tǒng)的2L增益分析,將系統(tǒng)建模為離散區(qū)間時(shí)變系統(tǒng),利用李雅普諾夫穩(wěn)定性定理和線性矩陣不等式技術(shù)對(duì)系統(tǒng)進(jìn)行狀態(tài)反饋控制器設(shè)計(jì);其二,針對(duì)一類輸入多率采樣網(wǎng)絡(luò)控制系統(tǒng),利用系統(tǒng)的輸出預(yù)測(cè)值,設(shè)計(jì)系統(tǒng)的動(dòng)態(tài)輸出反饋控制器,研究閉環(huán)系統(tǒng)的最優(yōu)保性能控制。另一方面,為了克服周期觸發(fā)的缺點(diǎn),避免冗余信息在網(wǎng)絡(luò)中傳輸,在保證系統(tǒng)性能的同時(shí)節(jié)省網(wǎng)絡(luò)通信資源,本文對(duì)事件觸發(fā)控制機(jī)制進(jìn)行研究。通過(guò)建立一種新的混合事件觸發(fā)控制機(jī)制條件,考慮數(shù)據(jù)包丟失和網(wǎng)絡(luò)時(shí)延的影響,基于輸出反饋控制,通過(guò)利用線性矩陣不等式技術(shù)并構(gòu)造新的Lyapunov-Krasovskii泛函對(duì)閉環(huán)系統(tǒng)進(jìn)行2L增益分析。
[Abstract]:Networked control system (NCS) is a hot research direction in the field of control in recent years. In NCS, distributed closed-loop control system is formed by real-time communication network connection between nodes distributed in different physical regions. As a kind of distributed computer control system, NCS is modeled in the system. The analysis and design will inevitably involve the sampling and holding of the signal and so on. On the other hand, how to reduce the transmission of redundant information and improve the utilization rate of limited network bandwidth is very important to control multiple loops by sharing network communication resources. In the analysis and design of networked control system, the selection of sampling period can not only affect the control performance of the system, but also reflect the transmission of data on the network. Most of the current research results are based on fixed-period sampling, which is helpful for modeling and simplifying system analysis, but it is not practical and even leads to waste of network resources. Considering the essential characteristics of networked control system, this paper mainly includes the following two aspects: on the one hand, according to the time-varying characteristics of data information in communication network, the time-varying sampling period networked control system is studied. There are two aspects in this work: first, the 2L gain analysis of the time-varying sampling period networked control system with bounded time-varying delay is studied, and the system is modeled as discrete interval time-varying system. The state feedback controller of the system is designed by using Lyapunov stability theorem and linear matrix inequality (LMI) technique. Secondly, for a class of input multi-rate sampled network control system, the dynamic output feedback controller is designed by using the output predictive value of the system, and the optimal guaranteed cost control of the closed-loop system is studied. On the other hand, in order to overcome the shortcomings of periodic triggering, avoid the redundant information transmission in the network, and save the network communication resources while ensuring the system performance, this paper studies the event trigger control mechanism. Based on output feedback control, a new hybrid event triggering control mechanism is proposed, which takes into account the effects of packet loss and network delay. By using linear matrix inequality (LMI) technique and constructing a new Lyapunov-Krasovskii functional, the 2L gain analysis of the closed-loop system is carried out.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273

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