组合机床与自动化加工技术
組閤機床與自動化加工技術
조합궤상여자동화가공기술
MODULAR MACHINE TOOL & AUTOMATIC MANUFACTURING TECHNIQUE
2015年
4期
78-82
,共5页
丛明%王冠雄%谢书文%潘大庆
叢明%王冠雄%謝書文%潘大慶
총명%왕관웅%사서문%반대경
早期故障%浴盆曲线%加工中心
早期故障%浴盆麯線%加工中心
조기고장%욕분곡선%가공중심
early failure%bathtub curve%machining centers
为了对加工中心早期故障进行有效的预测和控制,采集了26台加工中心从试运行开始的102组故障数据,并以此为基础,列出并比较了3种较常用的两重威布尔分布函数模型,从中选取分段威布尔函数作为拟合模型。为提高分段威布尔模型特征参数估计精度,提出迭代寻址求最优解法,以拟合精度为目标优化量,有效避免了时间分界点选取错误,提高了拟合精度,计算得出早期故障期大约持续4个月,与厂家反馈一致,并对分析结果进行了拟合优度检验和Laplace检验,检验结果符合要求。
為瞭對加工中心早期故障進行有效的預測和控製,採集瞭26檯加工中心從試運行開始的102組故障數據,併以此為基礎,列齣併比較瞭3種較常用的兩重威佈爾分佈函數模型,從中選取分段威佈爾函數作為擬閤模型。為提高分段威佈爾模型特徵參數估計精度,提齣迭代尋阯求最優解法,以擬閤精度為目標優化量,有效避免瞭時間分界點選取錯誤,提高瞭擬閤精度,計算得齣早期故障期大約持續4箇月,與廠傢反饋一緻,併對分析結果進行瞭擬閤優度檢驗和Laplace檢驗,檢驗結果符閤要求。
위료대가공중심조기고장진행유효적예측화공제,채집료26태가공중심종시운행개시적102조고장수거,병이차위기출,렬출병비교료3충교상용적량중위포이분포함수모형,종중선취분단위포이함수작위의합모형。위제고분단위포이모형특정삼수고계정도,제출질대심지구최우해법,이의합정도위목표우화량,유효피면료시간분계점선취착오,제고료의합정도,계산득출조기고장기대약지속4개월,여엄가반궤일치,병대분석결과진행료의합우도검험화Laplace검험,검험결과부합요구。
In order to decrease and predict the damage of early failures, the failure datas of 26 machining centers were collected. Three models involving two weibull distributions were studied. Depending on com-paring the plots on Weibull plotting paper ( WPP) , the sectional model is selected as the best one to model the failure data. A new method of calculating parameters is introduced, which is useful to avoid the error of demarcation time selection and improve the accuracy of fitting. It can be calculated that earlier failure period is about 4 months, which is coincident with the consumer feedback. D test method and Laplace test method was used to examine the model, and the results validated the sectional model.