航空计算技术
航空計算技術
항공계산기술
AERONAUTICAL COMPUTER TECHNIQUE
2015年
2期
26-30
,共5页
航空发动机%信息融合%贝叶斯粗糙集%证据理论%状态评估
航空髮動機%信息融閤%貝葉斯粗糙集%證據理論%狀態評估
항공발동궤%신식융합%패협사조조집%증거이론%상태평고
aero-engine%information fusion%Bayesian rough set%evidence theory%state assessment
针对航空发动机状态监测数据的模糊性和随机性,结合贝叶斯粗糙集和D-S证据理论,提出一种改进信息融合的状态评估方法。首先对样本数据进行离散化处理,通过基于区分矩阵的属性约简算法对影响发动机性能的特征参数进行提取,生成最佳决策表。然后根据置信增益函数重新定义了贝叶斯粗糙集,利用贝叶斯粗糙集的支持度和置信增益函数作为证据的支持程度,得到各准则下的证据基本信任分配。最后利用证据合成法则对多个证据进行合成,得到评估结果。通过实例计算,验证了改进方法应用在航空器发动机状态评估中的有效性以及在处理不完备信息问题时的优越性。
針對航空髮動機狀態鑑測數據的模糊性和隨機性,結閤貝葉斯粗糙集和D-S證據理論,提齣一種改進信息融閤的狀態評估方法。首先對樣本數據進行離散化處理,通過基于區分矩陣的屬性約簡算法對影響髮動機性能的特徵參數進行提取,生成最佳決策錶。然後根據置信增益函數重新定義瞭貝葉斯粗糙集,利用貝葉斯粗糙集的支持度和置信增益函數作為證據的支持程度,得到各準則下的證據基本信任分配。最後利用證據閤成法則對多箇證據進行閤成,得到評估結果。通過實例計算,驗證瞭改進方法應用在航空器髮動機狀態評估中的有效性以及在處理不完備信息問題時的優越性。
침대항공발동궤상태감측수거적모호성화수궤성,결합패협사조조집화D-S증거이론,제출일충개진신식융합적상태평고방법。수선대양본수거진행리산화처리,통과기우구분구진적속성약간산법대영향발동궤성능적특정삼수진행제취,생성최가결책표。연후근거치신증익함수중신정의료패협사조조집,이용패협사조조집적지지도화치신증익함수작위증거적지지정도,득도각준칙하적증거기본신임분배。최후이용증거합성법칙대다개증거진행합성,득도평고결과。통과실례계산,험증료개진방법응용재항공기발동궤상태평고중적유효성이급재처리불완비신식문제시적우월성。
Since aero-engine state monitoring data is fuzzy and random ,a method of improved information fusion is proposed based on the theory of Bayesian rough set and D-S evidence theory which can be used for aero-engine state assessment .Firstly,the test data is discretized and we extract the key parameters that effect aero-engine performance by using attribution reduction algorithm based on discernibility ma-trix.Secondly ,the Bayesian rough set and the support degree are redefined ,and the certainty gain function of the Bayesian rough set in the best decision table are calculated .According to the normalization method , the basic probability assignments are obtained .Finally,the evidences are fused utilizing the D-S combi-nation rule.This proposed method is applied to solve the problems of aero-engine state assessment ,The calculation results indicate the validity of practical application and the accuracy is enhanced in compari -son with other methods on the condition that information is insufficient .