【摘要】：隨著網(wǎng)絡控制技術(shù)的不斷進步,傳統(tǒng)控制系統(tǒng)網(wǎng)絡化便成為一種新的發(fā)展趨勢。因此,網(wǎng)絡控制系統(tǒng)(Networked Control Systems, NCS)引起了越來越多學者的廣泛興趣。其安裝簡單,維護便捷,運營成本不高,被大量的運用在工業(yè)與工程中。隨著NCS規(guī)模的逐步擴大,復雜程度的不斷加大,即使是微小故障也會造成不可預料、無法估計的人員傷亡和財產(chǎn)損失。為保證系統(tǒng)運行的可靠性,展開對網(wǎng)絡控制系統(tǒng)故障檢測與容錯控制的研究顯得尤為重要。另一方面,Delta算子作為連續(xù)系統(tǒng)和離散系統(tǒng)描述的統(tǒng)一形式,能夠很好的解決移位算子在高速采樣時引起的數(shù)值不穩(wěn)定問題,其在故障檢測和容錯控制中的應用研究日益成熟。本文把Delta算子方法引入到NCS故障檢測以及容錯控制當中,具有較為重要的科研意義和應用價值。 本文的主要工作和取得成果有如下幾點： 首先,在網(wǎng)絡控制系統(tǒng)一般模型基礎上,建立了Delta算子描述的時延網(wǎng)絡控制系統(tǒng)的狀態(tài)方程。然后綜合考慮不確定網(wǎng)絡誘導時延和存在外部擾動情況,根據(jù)利亞普諾夫穩(wěn)定性理論,給出故障檢測濾波器存在的充分條件和求解過程,算例仿真驗證了該方法的有效性。 其次,考慮原有不確定網(wǎng)絡控制系統(tǒng)模型,在短時延的情況下,給出了Delta算子描述的不確定網(wǎng)絡控制系統(tǒng)。然后假設發(fā)生執(zhí)行器失效,引入狀態(tài)反饋控制器,根據(jù)容錯控制理論,運用線性矩陣不等式方法,給出了保證系統(tǒng)穩(wěn)定的容錯控制器設計方法,最后所做的仿真實驗表明了該容錯控制器具有較好的容錯效果。
[Abstract]:With the continuous progress of network control technology, traditional control system networking has become a new development trend. Therefore, the network control system (Networked Control Systems, NCS) has attracted more and more scholars' interest. Its installation is simple, the maintenance is convenient, the operation cost is not high, is used in the industry and the engineering. With the gradual expansion of NCS scale and the increasing complexity, even minor faults will cause unpredictable casualties and property losses. In order to ensure the reliability of the system, it is very important to study the fault detection and fault-tolerant control of the network control system. On the other hand, as a unified form of continuous system and discrete system description, Delta operator can solve the numerical instability problem caused by shift operator in high-speed sampling, and its application in fault detection and fault-tolerant control is becoming more and more mature. In this paper, Delta operator method is introduced into NCS fault detection and fault-tolerant control, which has important scientific significance and application value. The main work and achievements of this paper are as follows: firstly, based on the general model of networked control system, the state equation of networked control system with delay described by Delta operator is established. Then, considering the uncertain network induced delay and the existence of external disturbances, the sufficient conditions for the existence of the fault detection filter and the solution process are given according to Liaponov's stability theory. The simulation results show that the method is effective. Secondly, considering the original model of uncertain networked control system, the uncertain networked control system described by Delta operator is given in the case of short time delay. Then the state feedback controller is introduced. According to the fault-tolerant control theory and linear matrix inequality (LMI) method, the design method of the fault-tolerant controller is given to ensure the stability of the system. Finally, the simulation results show that the fault-tolerant controller has good fault-tolerant effect.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TP273;TP302.8

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