摘要
针对发动机单缸部分失火故障,提出基于小波阈值降噪和残差神经网络的“降噪-残差神经网络”故障诊断方法。通过降噪与深度学习算法相结合,将小波阈值降噪后的振动信号输入到残差神经网络进行故障诊断;使用短残差块进一步防止网络的退化,并利用大卷积核增大长数据输入的卷积视野,提高信号故障特征的提取能力。测试结果证明该方法不仅实现了未参与训练的运转工况97%以上的故障诊断准确率,而且对于加入高斯噪声后的含噪声信号也能实现较高的诊断准确率。通过与其他故障诊断网络进行对比证明了该方法的优越性。
A fault diagnosis method of“noise reduction-residual neural network”based on wavelet threshold denoising and residual neural network was proposed for partial misfire fault diagnosis of engine cylinders.Combining the noise reduction and deep learning algorithm,the signal was denoised by wavelet threshold and fed into the residual neural network for fault diagnosis.Unlike the previous residual network,the short residual block would be utilized to further prevent network degradation.Besides,the large convolution kernel was also used to expand the convolution field of long data input and improve the ability to extract fault characteristics.Experimental results show that this method can not only achieve more than 97%fault diagnosis accuracy for the operation conditions without training,but also achieve high diagnosis accuracy for the noisy signals with Gaussian noise.The performance of the proposed method is proved to be more superiority and excellent than those of other misfire fault diagnosis algorithms.
作者
庞皓乾
张攀
王文
王彦军
邹佳华
高文志
PANG Haoqian;ZHANG Pan;WANG Wen;WANG Yanjun;ZOU Jiahua;GAO Wenzhi(State Key Laboratory of Engines,Tianjin University,Tianjin 300354,China;SINOTRUCK Qingdao Heavy Industry Co.,Ltd.,Qingdao 266111,China)
出处
《内燃机工程》
CAS
CSCD
北大核心
2023年第3期91-100,共10页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金重点项目(51636005)。
关键词
部分失火
故障诊断
振动信号
小波阈值降噪
残差神经网络
短残差块
partial misfire
fault diagnosis
vibration signal
wavelet threshold noise reduction
residual neural network
short residual blocks
