本文關鍵詞： 故障診斷 多Agent系統(tǒng)(MAS) 協(xié)作機制 合同網(wǎng)協(xié)議 自適應模型　出處：《太原理工大學》2011年碩士論文　論文類型：學位論文

【摘要】：隨著現(xiàn)代工業(yè)的迅速發(fā)展,機械設備的規(guī)模越來越龐大,自動化程度越來越高,集成化管理方式也越來越普遍,一旦設備出現(xiàn)問題將會帶來重大的事故和巨大的財產(chǎn)損失。傳統(tǒng)的采用簡單儀器和人工經(jīng)驗的方法己不能滿足現(xiàn)代復雜設備的故障診斷。近年來,機械故障診斷技術在國內(nèi)外受到高度的重視,在機械學、通信學、計算機學和人工智能等科學的基礎上迅速發(fā)展成為一門新興學科。利用智能系統(tǒng)對設備進行故障診斷,及時發(fā)現(xiàn)故障,以保障關鍵設備的正常運行具有重大的意義。 MAS(多Agent系統(tǒng))作為一種良好的解決分布式問題的技術,其方法和理論在很多領域都有廣泛應用。針對現(xiàn)代機械故障診斷系統(tǒng)的復雜性、分布性和動態(tài)性,MAS能利用模塊化的設計思想和并行的分布式處理技術,將復雜的系統(tǒng)分解成相對獨立的子系統(tǒng),而后通過各Agent的交互和協(xié)作共同完成相對復雜的任務。當然,復雜機電設備診斷的過程中會出現(xiàn)大量新的信息和知識,面對動態(tài)的診斷環(huán)境,MAS故障診斷系統(tǒng)必須能適應其周圍環(huán)境,根據(jù)不同的診斷對象構建相應的模型。因此,研究自適應的診斷模型有著很重要的理論和現(xiàn)實意義。 一個好的多Agent系統(tǒng),必須有良好的協(xié)作機制的支持。多Agent間的協(xié)作問題研究是伴隨著多Agent系統(tǒng)的出現(xiàn)就產(chǎn)生的。協(xié)作不僅能使整個系統(tǒng)解決問題的能力得到提高,而且增加了多Agent系統(tǒng)的靈活性。針對系統(tǒng)的分布性特征,本文選擇了基于合同網(wǎng)的協(xié)作機制,并且在傳統(tǒng)合同網(wǎng)的基礎上,提出了一種改進的合同網(wǎng)模型PC-CNP (Postpone Commitement-Contract Net Protocol,推遲確認的合同網(wǎng)協(xié)議),改善了傳統(tǒng)合同網(wǎng)在資源分配和通信問題上缺陷。實驗證明,在基于PC-CNP的協(xié)作機制下,任務完成效率明顯高于基于傳統(tǒng)合同網(wǎng)的機制。 本文以某大型選煤廠的復雜機電設備為背景,建立了基于MAS的故障診斷自適應模型AMFD (Adaptive Model in Fault Diagnosis)。該模型的層次結構與復雜機電設備的層次化組織特點相匹配,同時具有分布性和自適應性,能夠根據(jù)診斷對象的變化,通過在拓撲結構、Agent組織、診斷流程和知識領域方面的重構,從而得到優(yōu)化的診斷系統(tǒng)。為了規(guī)范系統(tǒng)的描述,本文采用BNF(巴科斯范式)形式化語言對該AMFD的結構組成等方面進行了形式化定義。最后,在JADE平臺上實現(xiàn)了AMFD的原型系統(tǒng),其中,其動態(tài)的知識管理和層次化的體系結構使增強了系統(tǒng)可擴展性和可伸縮性。
[Abstract]:With the rapid development of modern industry, machinery and equipment more and more large scale, more and more high degree of automation, integrated management is becoming more and more popular, once the equipment problems will lead to major accidents and huge property losses. Methods using simple instrument and artificial experience of the traditional can not meet the modern fault diagnosis of complex equipment in recent years, machinery fault diagnosis technology has been highly valued at home and abroad in mechanics, communication science, computer science and artificial intelligence based on the rapid development of science has become a new subject. Fault diagnosis of equipment based on intelligent system, timely detection of failure, to guarantee the normal operation of the key equipment is of great significance.
MAS (multi Agent system) as a good solution to the problem of distributed technology, its theories and methods are widely used in many fields. Because of the complexity of modern mechanical fault diagnosis system, distributed and dynamic, MAS can use the modular design method and parallel distributed processing technology, the complex the system is decomposed into relatively independent subsystems, and then through the interaction and collaboration of each Agent to complete complicated tasks. Of course, the emergence of a large number of new information and knowledge will be the process of complex electromechanical equipment diagnosis, diagnosis in the dynamic environment, the MAS fault diagnosis system must be able to adapt to the surrounding environment, according to the corresponding model the different diagnosis target construction. Therefore, there is an important theoretical and practical significance to study the adaptive diagnosis model.
A good multi Agent system, there must be a good mechanism for collaboration support. The research collaboration between multi Agent is accompanied by the emergence of multi Agent system is generated. The cooperation ability can not only make the whole system to solve the problem is improved, but also increase the flexibility of the multi Agent system. According to the characteristics of distribution system in this paper, the coordination mechanism based on contract net, and based on the traditional contract net, proposes an improved contract net model (PC-CNP Postpone Commitement-Contract Net Protocol contract net protocol, delayed confirmation) to improve the traditional contract net, in resource allocation and communication problems on defects. The experimental results show that based on the the coordination mechanism of PC-CNP, task completion rate was significantly higher than that of the traditional mechanism based on contract net.
Based on the background of complex electromechanical equipment of a large coal preparation plant, established the fault diagnosis model based on adaptive AMFD MAS (Adaptive Model in Fault Diagnosis). The characteristics of hierarchical organization hierarchical structure of the model and the complex electromechanical equipment matching, which has distributed and adaptive, can according to the change of the diagnosis object, through in the topology, Agent, reconstruction of diagnosis process and knowledge, in order to get the diagnosis system optimization. In order to standardize the description of the system, this paper uses BNF (Backus paradigm) formal language for the formal definition of the AMFD structure. Finally, a prototype system of AMFD based on JADE based on the knowledge management and hierarchical structure of the dynamic enhances the expansibility and scalability.

【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH165.3

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