柴油机
柴油機
시유궤
DIESEL ENGINE
2012年
6期
10-13,23
,共5页
柴油机%故障诊断%总体经验模态分解%最小二乘支持向量机%特征向量
柴油機%故障診斷%總體經驗模態分解%最小二乘支持嚮量機%特徵嚮量
시유궤%고장진단%총체경험모태분해%최소이승지지향량궤%특정향량
diesel engine%fault diagnosis%ensemble empirical mode decomposition%least square supportvector machine%eigenvector
针对船用柴油机故障诊断时振动信号的非平稳特性和难以获取大量样本的实际情况,提出一种总体经验模态分解EEMD和最小二乘支持向量机LSSVM相结合的诊断方法。运用EEMD方法对特定时段的振动信号进行分析,计算各内禀模态函数IMF,并求其包含时间信息的能量熵,以之作为特征向量输入到LSSVM分类器来判断柴油机的故障类型。经实例验证,该方法能在保持信号完整性的前提下有效提取故障特征,在小样本情况下具有较高的诊断精度、较快的诊断速度和较强的泛化能力,能有效应用于同类型机械的故障诊断。
針對船用柴油機故障診斷時振動信號的非平穩特性和難以穫取大量樣本的實際情況,提齣一種總體經驗模態分解EEMD和最小二乘支持嚮量機LSSVM相結閤的診斷方法。運用EEMD方法對特定時段的振動信號進行分析,計算各內稟模態函數IMF,併求其包含時間信息的能量熵,以之作為特徵嚮量輸入到LSSVM分類器來判斷柴油機的故障類型。經實例驗證,該方法能在保持信號完整性的前提下有效提取故障特徵,在小樣本情況下具有較高的診斷精度、較快的診斷速度和較彊的汎化能力,能有效應用于同類型機械的故障診斷。
침대선용시유궤고장진단시진동신호적비평은특성화난이획취대량양본적실제정황,제출일충총체경험모태분해EEMD화최소이승지지향량궤LSSVM상결합적진단방법。운용EEMD방법대특정시단적진동신호진행분석,계산각내품모태함수IMF,병구기포함시간신식적능량적,이지작위특정향량수입도LSSVM분류기래판단시유궤적고장류형。경실례험증,해방법능재보지신호완정성적전제하유효제취고장특정,재소양본정황하구유교고적진단정도、교쾌적진단속도화교강적범화능력,능유효응용우동류형궤계적고장진단。
With reference to the unsteady characteristic of vibration signal and the difficulty of obtaining mass sample when making a fault diagnosis of ship diesel engine, a diagnostic method combining EEMD and LSSVM is put forward. EEMD is used to analyze vibration signals at special time, calculate IMF and energy entropy including time information that will be used as eigenvector of LSSVM classifier, so as to judge the type of faults. An experimental example is given to validate the method, and it shows that this method can abstract characteristics of fault effectively and keep the integrality of signals. The method can also be applied to diagnose similar mechanical faults effectively because of its higher precision, faster diagnostic speed and stronger flexibility.