基于转子端数据驱动LSTM-CNN模型的高速旋转系统运行状态识别方法

Running Condition Identification of High-speed Shaft Based on Shaft-end-data Driven LSTM-CNN

  • 摘要: 针对复杂结构高速转轴运行状态难以准确实时监测与识别的问题,提出了一种基于转子系统数据驱动的复合神经网络转轴工况识别方法。首先,提出了一种基于长短期记忆网络(Long short-term memory,LSTM)和卷积神经网络(Convolutional neural networks,CNN)的复合神经网络模型(LSTM-CNN)。然后,建立双盘转子动力学仿真模型,并利用Newmark-β法对转子系统进行数值求解,获得转子系统关键固定节点动力学响应特征;同时基于有限元仿真获得关键旋转节点的动力学响应特征,并将两类数据分别导入LSTM-CNN模型中进行工况识别,并对其准确率和效率进行比较分析。最后,设计搭建高速转子实验平台,获取转子端和固定端数据分别对模型进行训练与验证,比较不同模型对高速转轴运行状态的识别能力。仿真数据与实验验证分析结果均表明基于转子端数据驱动的LSTM-CNN模型识别比传统的基于固定端数据驱动的识别方法具有更优的识别精度和效率。

     

    Abstract: Aiming at the problem that it is difficult to accurately real-time monitor and identify the running condition of high-speed shafts with complex structures, a composite neural network shaft running condition identification method based on the shaft-end-data driven is proposed. Firstly, a composite neural network model (LSTM-CNN) based on Long short-term memory (LSTM) and Convolutional neural networks (CNN) is proposed. A dual-disk shaft dynamics simulation model is then established. The Newmark-β method is used to numerically solve the shaft system for acquiring the dynamic response characteristics of the key fixed nodes of the shaft system; at the same time, the dynamic response characteristics of the key rotating nodes are obtained based on the finite element simulation. Two types of data are input into the LSTM-CNN model for running condition identification, and its accuracy and efficiency are compared and analyzed. Finally, a high-speed shaft experimental platform is designed and established, and the shaft-end data and fixed-end data are respectively used to train and test the LSTM-CNN model. The performance of different models for the running condition identification of the high-speed shaft is compared. Simulation and experimental verification analysis results show that the shaft-end-data driven LSTM-CNN have better running condition identification accuracy and efficiency than that based on the fixed-end-data driven.

     

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