针对故障预测与健康管理(Prognostic and health management,PHM)技术在民机维修工程中的应用问题,探讨了基于PHM的预测维修模式设计,提出了考虑PHM的初始维修任务分析流程以及基于PHM的预测维修模式实施方法。以B737NG空调系统为例开...针对故障预测与健康管理(Prognostic and health management,PHM)技术在民机维修工程中的应用问题,探讨了基于PHM的预测维修模式设计,提出了考虑PHM的初始维修任务分析流程以及基于PHM的预测维修模式实施方法。以B737NG空调系统为例开展验证研究,建立了基于数据驱动的空调系统PHM模型,设计了空调系统PHM维修模式,并基于历史运行数据开展了计划维修模式与预测维修模式下维修成本对比分析。研究结果表明:基于PHM的维修模式不仅可以取消部分定期检查工作,还可以通过提前监测减少非计划的维修事件,进而降低民机系统全寿命周期维修成本。成本效益分析表明:相比传统计划维修,PHM维修可降低40%以上的成本,进一步推广应用到整机其他系统将带来更大的经济效益和安全效益。展开更多
航空维修是飞机运营支持的重要工作之一,是航空公司保障安全飞行和控制运营成本的关键途径。目前应用实时故障预测与健康管理(Prognostic and health management,PHM)于航空维修领域还处于研究阶段,缺少工程实践数据和案例。针对缺乏应...航空维修是飞机运营支持的重要工作之一,是航空公司保障安全飞行和控制运营成本的关键途径。目前应用实时故障预测与健康管理(Prognostic and health management,PHM)于航空维修领域还处于研究阶段,缺少工程实践数据和案例。针对缺乏应用PHM技术的飞机维修相关验证与评估数据的问题,本文基于PHM的维修模式概念,建立PHM维修模式下的计划维修优化、非计划维修可控和PHM错误影响分析模型。借助计算机仿真技术,由不同的系统PHM性能参数输入,根据所建立的模型进行实施PHM前后的维修工时、维修成本和非计划维修事件数的仿真模拟计算,验证与评估基于PHM的维修模式在减少维修工时、节约维修成本和控制非计划维修事件方面的优势。选取空调系统作为验证评估对象进行了大量的仿真试验分析,在单一系统的理想状态下(即性能参数设置为最佳),基于PHM的维修模式相比于传统的预防性维修可以减少56%的维修工时,节约60%的维修成本,并且避免了88%的非计划维修事件。展开更多
Electrostatic monitoring technology of particle charging information can facilitate online monitoring of aero-engine,which effectively enhances engine fault diagnosis and health managements.Unlike traditional engine s...Electrostatic monitoring technology of particle charging information can facilitate online monitoring of aero-engine,which effectively enhances engine fault diagnosis and health managements.Unlike traditional engine state monitoring technologies,aircraft engine monitoring by gas path electrostatic monitoring not only covers the predicted information source itself,but also detects the information that can provide an early warnings for initial fault states through gas path charging levels.This paper establishes a non-stationary time sequence change-point model for anomaly recognition of electrostatic signals based on change-point theory combined with difference method of non-stationary time series.Finally,electrostatic induction data were utilized by the engine life test for a particular aircraft to validate the proposed algorithm.The results indicate that the activity level and the event rate were0.5—0.8(nc)and 50%,respectively,which were far greater than 4—12(pc)and 0—4% under normal working conditions of the engine.展开更多
Most of the maintenance optimization models in condition-based maintenance(CBM) consider the cost-optimal criterion, but few papers have dealt with availability maximization for maintenance applications. A novel optim...Most of the maintenance optimization models in condition-based maintenance(CBM) consider the cost-optimal criterion, but few papers have dealt with availability maximization for maintenance applications. A novel optimal Bayesian control approach is presented for maintenance decision making. The system deterioration evolves as a three-state continuous time hidden semi-Markov process. Considering the optimal maintenance policy, the multivariate Bayesian control scheme based on the hidden semi-Markov model(HSMM) is developed, the objective is to maximize the long-run expected average availability per unit time. The proposed approach can optimize the sampling interval and control limit jointly. A case study using Markov chain Monte Carlo(MCMC)simulation is provided and a comparison with the Bayesian control scheme based on hidden Markov model(HMM), the age-based replacement policy, Hotelling’s T2, multivariate exponentially weihted moving average(MEWMA) and multivariate cumulative sum(MCUSUM) control charts is given, which illustrates the effectiveness of the proposed method.展开更多
Engineering practice has shown that early faults of gearboxes are a leading maintenance cost driver that can easily lower the profit from a wind turbine operation.A novel oil-lubricated electrostatic monitoring of wea...Engineering practice has shown that early faults of gearboxes are a leading maintenance cost driver that can easily lower the profit from a wind turbine operation.A novel oil-lubricated electrostatic monitoring of wear debris for a wind turbine gearbox is presented.The continuous wavelet transform(CWT)is used to eliminate the noises of the original electrostatic signal.The kurtosis and root mean square(RMS)values of the time domain signal are extracted as the characteristic parameters to reflect the deterioration of the gearbox.The overall tendency of electrostatic signals in accelerated life test is analyzed.In the eighth cycle,the abnormal wear in the wind turbine gearbox is detected by electrostatic monitoring.A comparison with the popular MetalScan monitoring is given to illustrate the effectiveness of the electrostatic monitoring method.The results demonstrate that the electrostatic monitoring method can detect the fault accurately.展开更多
文摘针对故障预测与健康管理(Prognostic and health management,PHM)技术在民机维修工程中的应用问题,探讨了基于PHM的预测维修模式设计,提出了考虑PHM的初始维修任务分析流程以及基于PHM的预测维修模式实施方法。以B737NG空调系统为例开展验证研究,建立了基于数据驱动的空调系统PHM模型,设计了空调系统PHM维修模式,并基于历史运行数据开展了计划维修模式与预测维修模式下维修成本对比分析。研究结果表明:基于PHM的维修模式不仅可以取消部分定期检查工作,还可以通过提前监测减少非计划的维修事件,进而降低民机系统全寿命周期维修成本。成本效益分析表明:相比传统计划维修,PHM维修可降低40%以上的成本,进一步推广应用到整机其他系统将带来更大的经济效益和安全效益。
文摘航空维修是飞机运营支持的重要工作之一,是航空公司保障安全飞行和控制运营成本的关键途径。目前应用实时故障预测与健康管理(Prognostic and health management,PHM)于航空维修领域还处于研究阶段,缺少工程实践数据和案例。针对缺乏应用PHM技术的飞机维修相关验证与评估数据的问题,本文基于PHM的维修模式概念,建立PHM维修模式下的计划维修优化、非计划维修可控和PHM错误影响分析模型。借助计算机仿真技术,由不同的系统PHM性能参数输入,根据所建立的模型进行实施PHM前后的维修工时、维修成本和非计划维修事件数的仿真模拟计算,验证与评估基于PHM的维修模式在减少维修工时、节约维修成本和控制非计划维修事件方面的优势。选取空调系统作为验证评估对象进行了大量的仿真试验分析,在单一系统的理想状态下(即性能参数设置为最佳),基于PHM的维修模式相比于传统的预防性维修可以减少56%的维修工时,节约60%的维修成本,并且避免了88%的非计划维修事件。
基金supported by the Initial Scientific Research Fund (No.2015QD02S)the Foundation Research Funds for the Central Universities (No.3122016A004, 3122017027)
文摘Electrostatic monitoring technology of particle charging information can facilitate online monitoring of aero-engine,which effectively enhances engine fault diagnosis and health managements.Unlike traditional engine state monitoring technologies,aircraft engine monitoring by gas path electrostatic monitoring not only covers the predicted information source itself,but also detects the information that can provide an early warnings for initial fault states through gas path charging levels.This paper establishes a non-stationary time sequence change-point model for anomaly recognition of electrostatic signals based on change-point theory combined with difference method of non-stationary time series.Finally,electrostatic induction data were utilized by the engine life test for a particular aircraft to validate the proposed algorithm.The results indicate that the activity level and the event rate were0.5—0.8(nc)and 50%,respectively,which were far greater than 4—12(pc)and 0—4% under normal working conditions of the engine.
基金supported by the National Natural Science Foundation of China(51705221)the China Scholarship Council(201606830028)+1 种基金the Fundamental Research Funds for the Central Universities(NS2015072)the Funding of Jiangsu Innovation Program for Graduate Education(KYLX15 0313)
文摘Most of the maintenance optimization models in condition-based maintenance(CBM) consider the cost-optimal criterion, but few papers have dealt with availability maximization for maintenance applications. A novel optimal Bayesian control approach is presented for maintenance decision making. The system deterioration evolves as a three-state continuous time hidden semi-Markov process. Considering the optimal maintenance policy, the multivariate Bayesian control scheme based on the hidden semi-Markov model(HSMM) is developed, the objective is to maximize the long-run expected average availability per unit time. The proposed approach can optimize the sampling interval and control limit jointly. A case study using Markov chain Monte Carlo(MCMC)simulation is provided and a comparison with the Bayesian control scheme based on hidden Markov model(HMM), the age-based replacement policy, Hotelling’s T2, multivariate exponentially weihted moving average(MEWMA) and multivariate cumulative sum(MCUSUM) control charts is given, which illustrates the effectiveness of the proposed method.
基金co-supported by the National Natural Science Foundation of China(Nos.61403198,BK20140827 and U1233114)the Funding of Jiangsu Innovation Program for Graduate Education(No.KYLX15_0313)+1 种基金the Fundamental Research Funds for the Central Universities(No.NS2015072)the support provided by China Scholarship Council(No.201606830028)
文摘Engineering practice has shown that early faults of gearboxes are a leading maintenance cost driver that can easily lower the profit from a wind turbine operation.A novel oil-lubricated electrostatic monitoring of wear debris for a wind turbine gearbox is presented.The continuous wavelet transform(CWT)is used to eliminate the noises of the original electrostatic signal.The kurtosis and root mean square(RMS)values of the time domain signal are extracted as the characteristic parameters to reflect the deterioration of the gearbox.The overall tendency of electrostatic signals in accelerated life test is analyzed.In the eighth cycle,the abnormal wear in the wind turbine gearbox is detected by electrostatic monitoring.A comparison with the popular MetalScan monitoring is given to illustrate the effectiveness of the electrostatic monitoring method.The results demonstrate that the electrostatic monitoring method can detect the fault accurately.