某型舰艉部振动故障原因及措施

文章分析了某型舰艉部振动故障的原因,并提出有效的解决措施。     

直流限流器中IGBT关断时过电压的研究

直流电力系统短路时电流很大,在限流器内部换流过程中,线路分布电感会产生峰值很大的尖峰电压。本文简单的介绍了限流器的内部换流过程,通过计算说明过电压的来源以及抑制措施,并且建立了限流器具体模型,说明电路中电感、电容、电阻对过电压的影响,对吸收电容的选择有一定的实际意义;此外能量转移到吸收电容中,会使电容电压增加,本文分析了这个电压的后果,提出了解决措施。     

基于BP神经网络的航空故障诊断

BP神经网络在故障诊断中发挥着越来越重要的作用。基于航空设备的参数匹配问题,提出了一种对输入值进行相关性处理的方法,然后利用BPNN有自适应Lr的梯度下降算法的进行训练。仿真结果证明该模型训练速度快且有效。     

Fault detection and isolation for a full-scale railway vehicle suspension with multiple Kalman filters

Reliability and dependability in complex mechanical systems can be improved by fault detection and isolation (FDI) methods. These techniques are key elements for maintenance on demand, which could decrease service cost and time significantly. This paper addresses FDI for a railway vehicle: the mechanical model is described as a multibody system, which is excited randomly due to track irregularities. Various parameters, like masses, spring- and damper-characteristics, influence the dynamics of the vehicle. Often, the exact values of the parameters are unknown and might even change over time. Some of these changes are considered critical with respect to the operation of the system and they require immediate maintenance. The aim of this work is to detect faults in the suspension system of the vehicle. A Kalman filter is used in order to estimate the states. To detect and isolate faults the detection error is minimised with multiple Kalman filters. A full-scale train model with nonlinear wheel/rail contact serves as an example for the described techniques. Numerical results for different test cases are presented. The analysis shows that for the given system it is possible not only to detect a failure of the suspension system from the system's dynamic response, but also to distinguish clearly between different possible causes for the changes in the dynamical behaviour.     

潜艇空气压缩机滑油含水故障分析及对策

文章阐述潜艇空气压缩机在使用过程中,滑油出现含水故障的原因和排除方法。并以实例介绍了两型潜艇空气压缩机滑油中含水故障排除过程和方法。     

故障树分析NABCO M-800主机遥控系统故障

文章介绍了如何利用故障树原理分析主机遥控系统的故障,着重说明故障树的建立方法,NABCO M-800主机遥控系统的故障树建立以及发生故障后如何分析故障以便及早确定故障点。     

自动变速器动态检验与故障分析

通过对汽车自动变速器进行失速试验、时滞试验、液压试验等动态检验,可以就检验过程中所反映出的问题和相应的故障进行分析与判断,以便及时地对发生的故障予以排除,确保车辆完好的技术状况和安全行驶。     

钻孔灌注桩施工常见的质量事故及预防措施

钻孔灌注桩作为桥梁的基础,其质量好坏关系到整个桥梁工程建设的成败。根据多年的桥梁工程施工经验．对桥梁基桩施工中常见的质量通病以及发生原因进行总结与分析,并提出相应的预防与处理措施,有助于提高施工质量。     

马自达M6轿车电子防盗系统的检测

介绍了一汽马自达M6轿车电子防盗系统故障的具体检查方法。并同时培出了各种故障的故障代码。     

Kolmogorov熵在船舶电力系统可靠性研究中的应用

混沌分析和非线性特性的故障识别一直是船舶电力系统可靠性研究中的重点和难点,本文应用Kolmogorov熵分析和研究船舶电力系统的可靠性.通过计算和分析不同状态下船舶电力系统的K熵,得到了船舶电力系统的混沌定量判据,使船舶电力系统混沌分析与电力系统的可靠性研究结合起来,为船舶电力系统可靠性研究提供新的方法和思路,同时将K熵的计算数值作为电力系统中故障的特征值来识别系统的故障.实验表明了该方法的有效性和可行性.