【摘要】：隨著網(wǎng)絡(luò)控制技術(shù)的不斷進(jìn)步,傳統(tǒng)控制系統(tǒng)網(wǎng)絡(luò)化便成為一種新的發(fā)展趨勢(shì)。因此,網(wǎng)絡(luò)控制系統(tǒng)(Networked Control Systems, NCS)引起了越來(lái)越多學(xué)者的廣泛興趣。其安裝簡(jiǎn)單,維護(hù)便捷,運(yùn)營(yíng)成本不高,被大量的運(yùn)用在工業(yè)與工程中。隨著NCS規(guī)模的逐步擴(kuò)大,復(fù)雜程度的不斷加大,即使是微小故障也會(huì)造成不可預(yù)料、無(wú)法估計(jì)的人員傷亡和財(cái)產(chǎn)損失。為保證系統(tǒng)運(yùn)行的可靠性,展開(kāi)對(duì)網(wǎng)絡(luò)控制系統(tǒng)故障檢測(cè)與容錯(cuò)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(shí)引起的數(shù)值不穩(wěn)定問(wèn)題,其在故障檢測(cè)和容錯(cuò)控制中的應(yīng)用研究日益成熟。本文把Delta算子方法引入到NCS故障檢測(cè)以及容錯(cuò)控制當(dāng)中,具有較為重要的科研意義和應(yīng)用價(jià)值。 本文的主要工作和取得成果有如下幾點(diǎn)： 首先,在網(wǎng)絡(luò)控制系統(tǒng)一般模型基礎(chǔ)上,建立了Delta算子描述的時(shí)延網(wǎng)絡(luò)控制系統(tǒng)的狀態(tài)方程。然后綜合考慮不確定網(wǎng)絡(luò)誘導(dǎo)時(shí)延和存在外部擾動(dòng)情況,根據(jù)利亞普諾夫穩(wěn)定性理論,給出故障檢測(cè)濾波器存在的充分條件和求解過(guò)程,算例仿真驗(yàn)證了該方法的有效性。 其次,考慮原有不確定網(wǎng)絡(luò)控制系統(tǒng)模型,在短時(shí)延的情況下,給出了Delta算子描述的不確定網(wǎng)絡(luò)控制系統(tǒng)。然后假設(shè)發(fā)生執(zhí)行器失效,引入狀態(tài)反饋控制器,根據(jù)容錯(cuò)控制理論,運(yùn)用線性矩陣不等式方法,給出了保證系統(tǒng)穩(wěn)定的容錯(cuò)控制器設(shè)計(jì)方法,最后所做的仿真實(shí)驗(yàn)表明了該容錯(cuò)控制器具有較好的容錯(cuò)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(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TP273;TP302.8

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本文編號(hào)：2398914