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海军航空大学, 山东 烟台 264000
Received:07 July 2022,
Published Online:06 February 2024,
Published:30 January 2024
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Weimin LÜ, Chenfeng SUN, Likun REN, et al. A Gas Path Fault Diagnosis Method for Aero-engine Based on TCN-LGBM Model[J]. Acta Armamentarii, 2024, 45(1): 253-263.
Weimin LÜ, Chenfeng SUN, Likun REN, et al. A Gas Path Fault Diagnosis Method for Aero-engine Based on TCN-LGBM Model[J]. Acta Armamentarii, 2024, 45(1): 253-263. DOI: 10.12382/bgxb.2022.0615.
长时间工作在高温高压、强振动等恶劣气路环境下的航空发动机经常面临部件疲劳、腐蚀和性能退化的问题
且其故障诊断时序逻辑性不强、故障参数耦合较深等特点十分明显
为此提出一种基于时间卷积神经网络(Temporal Convolutional Network
TCN)和轻量级梯度提升机(Light Gradient Boosting Machine
LGBM)的航空发动机气路故障诊断方法。故障诊断分为故障特征提取和分类诊断两个过程:引入TCN框架
在保证故障数据训练时序逻辑的基础上
实现对远层历史信息和当前层信息的特征融合构建
融合通道注意力机制增强了高质量特征的权重;基于LGBM模型实现对特征的快速分类
利用贝叶斯方法实现对模型超参数的快速优化。以基于PROOSIS软件建模的某军用小涵道比涡扇发动机故障仿真数据为例
对6种故障模式进行诊断识别。仿真结果表明了所提方法的有效性;通过与其他模型对比体现了该方法的优越性。
With the obvious characteristics of poor temporal logic in fault diagnosis and the strongly coupled feature parameters
the aero-engines working in the hostile gas path conditions of high temperature
pressure and strong vibration face with the degradation performance and structure defect problems such as fatigue and corrosion. And an aero-engine gas path fault diagnosis method based on temporal convolutional networks(TCN) and light gradient boosting machine(LGBM) is proposed to provide a feasible solution to the problems above. The diagnosis process can be divided into feature extraction and classification: TCN is introduced to guarantee the fault diagnosis training temporal logic and achieve the features fusion of distant layers and current layers
which is also strengthened by channel attention mechanism; the features are quickly classified based on LGBM model
and the Bayesian method is used to quickly optimize the model hyperparameters. Based on the aero-engine performance modelled by PROOSIS software
six types of fault mode are diagnosed and identified by taking a military low-bypass ratio turbofan engine as an example. The results indicate that the proposed model is effective for fault diagnosis and shows the superiority by comparing with other models.
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WEI T T , VAN BEEK A , HAO J R , et al . Bayesian calibration of performance degradation in a gas turbine-driven compressor unit for prognosis health management [J ] . Journal of Engineering for Gas Turbines and Power , 2022 , 144 ( 5 ): 51014 . DOI: 10.1115/1.4053564 http://doi.org/10.1115/1.4053564 https://asmedigitalcollection.asme.org/gasturbinespower/article/144/5/051014/1131408/Bayesian-Calibration-of-Performance-Degradation-in https://asmedigitalcollection.asme.org/gasturbinespower/article/144/5/051014/1131408/Bayesian-Calibration-of-Performance-Degradation-in Prognosis health management is an effective way to improve the operational safety and economy of industrial equipment. The development of an accurate and quick response model to monitor equipment health status, predict performance, and diagnose faults is key to its implementation. However, the inevitable performance degradation of industrial equipment over time poses a significant challenge to such a model. In this work, we adopt a Bayesian approach to calibrate thermodynamic simulations with time-dependent parameters that account for performance degradation. The relationship between degradation and time is modeled through an assumed functional form, referred to as a health indicator. The proposed health indicator calibration method gives a rapid assessment of degraded equipment performance and elucidates how degradation relates to time. The novelty of this paper is that it regards performance degradation as an uncertainty quantification problem rather than a deterministic problem. The health indicator calibration method is validated on a natural gas compressor and a gas turbine. The results show that when severe degradation occurs, functional calibration improves predictive performance over nonfunctional calibration (i.e., independent of time). The introduced method provides valuable decision support to extend the service life and reduce maintenance costs for industrial equipment. Its feedback in operation can also develop the service assessment criteria and inform the design of subsequent generations of industrial equipment.
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张浩 , 胡昌华 , 杜党波 , 等 . 多状态影响下基于Bi-LSTM网络的锂电池剩余寿命预测方法 [J ] . 电子学报 , 2022 , 50 ( 3 ): 619 - 624 . DOI: 10.12263/DZXB.20210207 http://doi.org/10.12263/DZXB.20210207 现有基于深度学习的锂电池剩余寿命(Remaining Useful Life, RUL)预测方法中,锂电池多个内部状态所蕴含的寿命信息未得到充分考虑.鉴于此,提出了一种融合电池容量、阻抗与温度三个内部状态的RUL预测模型.首先,引入双向长短时记忆(Bi?directional Long Short?Term Memory, Bi?LSTM)网络学习三种状态数据的时间相关性.其次,利用dropout技术与Bayesian变分推断技术间的等价性实现了RUL预测结果的不确定性量化,得到了预测结果的95%置信区间与概率密度分布(Probability Density Function, PDF),并分析了不同dropout率对预测不确定性的影响.最后,通过四种不同的深度学习模型框架与两种内部状态输入方案的对比实验,验证了本文方法的有效性.
ZHANG H , HU C H , DU D B , et al . Remaining useful life prediction method of lithium-Ion battery based on Bi-LSTM network under multi-state influence [J ] . Acta Electronica Sinica , 2022 , 50 ( 3 ): 619 - 624 . (in Chinese) DOI: 10.12263/DZXB.20210207 http://doi.org/10.12263/DZXB.20210207 The life information contained in multiple internal states of lithium-ion battery is not fully considered in the existing RUL(Remaining Useful Life) prediction methods of lithium-ion battery based on deep learning. In view of this, a RUL prediction model that integrates the three internal states include battery capacity, impedance and temperature is proposed. The Bi-LSTM(Bi-directional Long Short-Term Memory) network is introduced to learn the correlation about time of the data of the three states firstly. Secondly, the equivalence between dropout technology and Bayesian variational inference technology is used to quantify the uncertainty of the RUL prediction results. The 95% confidence interval and PDF(Probability Distribution Function) of the RUL prediction results are obtained, and the effect on the prediction uncertainty of different dropout rates is analyzed. Finally, the effectiveness of this method is verified through the comparative experiments of four different deep learning model and two input schemes of internal state.
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