共查询到13条相似文献,搜索用时 93 毫秒
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针对旋转机械复杂声场中强噪声干扰及故障源未知等难题,提出一种基于盲解卷积的声学诊断方法.该方法采用包络谱余弦测度作为独立分量间距离测度,结合冲击信号峭度指标优选独立分量,进而通过频域稀疏分量分析对估计信号做进一步的分离,最终实现在欠定条件下对滚动轴承复合故障信号的可靠提取.实际声场环境中的滚动轴承复合故障声信号提取试验验证了该方法的有效性. 相似文献
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四、远程诊断系统建设远程诊断系统应达到如下目标。1.远程实时设备诊断安装在轧机设备上的监测系统通过企业局域网和Internet与车间、厂部和集团职能部门以及大专院校、科研单位或社会化设备远程诊断中心和网站直接连接,以使它们实时获得设备运行的监测数据,实现远程监测诊断。2.支持网络设备管理设备管理子系统是信息网络的一部分,设备监测数据远程诊断网络的数据直接与设备管理信息相连,可实现运行、维修、备件管理的信息化。3.扩展覆盖范围高线设备远程故障诊断局域网以企业计算机网络中心为核心,扩展网络范围覆盖主要生产… 相似文献
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张雪 《现代制造技术与装备》2019,(3)
客车故障轨边图像检测系统是旅客列车安全运行的重要保障,该系统打破了传统作业模式,提升了检车作业效率。随着TVDS系统日益完善,使用频率也越来越高,运用过程中的各种问题也日渐凸显出来。主要介绍了TVDS设备组成及现场运用情况,针对长春车辆段运用实际情况,分析TVDS系统运用中存在问题,并提出相应的整改措施,希望对优化TVDS系统起到一定帮助作用。 相似文献
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《Measurement》2014
The phenomenon of Doppler Effect in the acoustic signal recorded by the wayside acoustic defective bearing detector (ADBD) leads to the difficulty for fault diagnosis of train bearings with a high moving speed, which is a barrier that would badly reduce the effectiveness of online defect detection. In order to improve the performance of condition monitoring of the bearings on a passing train with microphones amounted besides the railway, the elimination of the Doppler Effect should be solved firstly. An effective method for removing the Doppler Effect embedded in the source signal is presented in this paper. The Short Time Fourier Transform-Viterbi Algorithm (STFT-VA) is applied to obtain instantaneous frequency estimation of the distorted signal. According to the acoustic theory of Morse, the non-linear data fitting is then carried out to get the fitting instantaneous frequencies. The necessary parameters for time domain interpolation re-sampling, which is totally based on the kinematic analysis, are acquired from the fitting curve and the re-sampling sequence could be established in the time domain. As a result of the preceding steps, the fault diagnosis for the train bearings could be implemented with the restored signal. The effectiveness of this proposed method is verified by means of a simulation with three adjacent frequencies and an experiment with practical acoustic signals of train bearings with a crack on the outer race and the inner race. The results of the simulation and the experiment indicate that the proposed method has an excellent performance in removing Doppler Effect, and could be well employed to the condition monitoring and fault diagnosis of train bearings with a high moving speed. 相似文献
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滚动轴承是机械设备的关键部件,也是机器容易发生故障的部位,因此轴承质量的好坏,运转过程中的检测及寿命的提高显得尤为重要.基于此介绍灰色系统几个主要理论和运用灰色系统理论解决一些关于轴承的问题及其在新问题中的展望. 相似文献