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1. An Ensemble Learning Prognostic Method for Remaining Useful Life Prediction of Aircraft Engines | |||
Hongwei Liu,Qiang Wang | |||
Engineering and Technological Science 27 October 2020 | |||
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Abstract:Data-driven models have been widely used to predict the remaining useful life (RUL) of many engineering systems, e.g. aircraft engines. However, two shortcomings exist: (i) single algorithm has performance limitations for the specific application and (ii) reliably tracking the degraded performance of aircraft engines remains challenging. In this paper, a new ensemble learning prognostic method is proposed, which considers the effects of performance degradation on RUL. First, the overall degradation process is divided into multiple degradation stages, which present the performance of aircraft engines. Then, in each degradation stage, the higher prediction accuracy the base learner obtains, the higher weight is assigned to the base leaner. Finally, based on the obtained weights, the predicted results of all base learners are combined to predict the RUL of aircraft engines. The experimental results of aircraft engines verify the effectiveness and practical value of the proposed method. The results show that the proposed method has a good predictive effect and fits the degradation curve of the aircraft engines well. | |||
TO cite this article:Hongwei Liu,Qiang Wang. An Ensemble Learning Prognostic Method for Remaining Useful Life Prediction of Aircraft Engines[OL].[27 October 2020] http://en.paper.edu.cn/en_releasepaper/content/4752991 |
2. Rescheduling of Flexible Manufacturing Production Considering Uncertain Environment | |||
Zhang Yaping,Liao Wenzhu | |||
Engineering and Technological Science 29 April 2020 | |||
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Abstract:This paper establishes a centralized combined rescheduling model that combines machine failure, order changes, fuzzy processing time and machine maintenance. It discusses a rescheduling problem based on monitoring condition information for flexible manufacturing in an uncertain environment to maximize customer satisfaction and minimize production cost under the delivery time window. According to various conditions in an uncertain environment, a rescheduling strategy and a rescheduling method is provided. In the face of multiple factors and multiple goals, as it is difficult for traditional scheduling methods to obtain the optimal scheduling solution quickly, this paper proposes an improved Non-dominated Sorting Genetic Algorithm II (NSGA-II) algorithm combined with initialization rules. Then, the decision-making scheduling schemes are simulated and analyzed in 8 cases. The computational results show the feasibility and effectiveness of this rescheduling method, and could well support real production rescheduling problem. | |||
TO cite this article:Zhang Yaping,Liao Wenzhu. Rescheduling of Flexible Manufacturing Production Considering Uncertain Environment[OL].[29 April 2020] http://en.paper.edu.cn/en_releasepaper/content/4751832 |
3. Correction Factors of the Mindlin Plate Equations with the Consideration of Electrodes | |||
Du Jianke,CHEN Guijia,WANG Wenjun,WU Rongxing,MA Tingfeng,WANG Ji | |||
Engineering and Technological Science 09 April 2012 | |||
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Abstract:The Mindlin plate theory has been playing a role vital in the analysis of high frequency vibrations of quartz crystal resonators at the thickness-shear mode. The coupled equations with infinite number of vibration modes have been truncated to retain essential ones with strong couplings for simplified analysis, and correction factors have been introduced to ensure exact solutions at cut-off frequencies as part of the validation procedure. Starting form plates without complications, correction factors have also been modified to include electrodes for their mass effect. Such results have been important to higher-order correction factors to ensure accurate consideration of electrodes in the AT-cut quartz crystal plates. The findings in factors systematic study are readily available for the analytical equations with selected modes with strong couplings, and equally convenient for the implementation of the finite element analysis with the Mindlin plate equations. | |||
TO cite this article:Du Jianke,CHEN Guijia,WANG Wenjun, et al. Correction Factors of the Mindlin Plate Equations with the Consideration of Electrodes[OL].[ 9 April 2012] http://en.paper.edu.cn/en_releasepaper/content/4474774 |
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