华北北部中晚元古代岩相古地理及其演化

本文探讨了华北北部中晚元古代的岩相古地理及其演化过程,认为中晚元古代本区经历了三个发展阶段,即长城系沉积时期的断陷海槽阶段、蓟县系沉积时期的强烈凹陷阶段和青白口系沉积时期的稳定陆表海阶段。在这一漫长的地质历史时期(距今1800～800百万年),华北北部经历了多次升降运动,多次海陆变迁,逐渐由相对活动状态转变为相对稳定状态。     

江苏宜兴地区推覆构造的发现及其油气勘探的意义

1976年,笔者在苏南茅山和苏州地区首次提出推覆构造的存在。到了1984年,又在宜兴地区发现了推覆构造。基于野外的调查和分析,将宜兴白泥山—老虎山(东岭涧坞,南山,白泥场),高山—仰峰岕的推覆构造分成两种类型,即褶皱拉铺型和断层拉铺型。文中叙述了逆冲推覆构造中的岩石力学性质,显微超微构造,位错构造和构造地球化学等特征。推覆构造的发现是了解地质构造同油气聚集关系以及了解区域构造的关键。笔者还指出了宜兴推覆构造同油气藏及其分布的密切关系。     

单相不间断供电电源的微机控制系统

本文阐述了微计算机控制单相不间断供电电源的原理.市电断电后该系统仍不间断供电.当市电重新送来时,能实现同步锁相,自动转换到市电供电.实际运行表明,该系统抗干扰能力强、可靠性高,适用于计算机网络、通信、高精度电子仪器等方面.     

Application of MBAM Neural Network in CNC Machine Fault Diagnosis

In ruder to improve the bidirectional associative memory (BAM) performance, a modified BAM medei(MBAM) is used to enhance neural netwcrk(NN)‘s memory capacity and error correction capability, theoretical analysis and experment results illuminate that MBAM performs much better than the original BAM. The MBAM is used in computer numeric control(CNC) machine fault diagnosis, it not only can complete fault diagnosis correctly but also have fairly high error correction capability for disturbed Input Information sequence. Moreover MBAM model is a more convenient and effective method of solving the problem of CNC electric system fault diagnosis.     

汽车检测线的故障诊断专家系统设计

汽车安全性能检测站是综合运用现代检测技术、电子技术和计算机技术，对汽车实施不解体检测、诊断的场所。而检测线设备出现故障大大降低了汽车检测线的工作效率，针对此问题，提出了基于故障树的故障诊断专家系统的设计思想和实现方法。     

超低速旋转不完全重载大轴承故障与诊断探讨

分析了超低速旋转不完全重载大轴承故障特点及其诊断方法,就故障诊断方法以及故障的严重程度的判断进行了讨论,并用此方法对超低速旋转不完全重载大轴承故障实例进行了分析。     

基于小波分析的轴承故障诊断研究

提出了基于正交变换的滚动轴承故障诊断新方法。利用正交小波基将滚动轴承故障信号变换到时间 -频率域 ,通过小波重构信号的希尔波特变换解调和包络谱分析 ,对轴承的故障进行了有效的诊断。文中实例证明 ,小波变换对处理非平稳信号具有很好的应用效果     

Structural characteristics of middle and southern Xainza-Dinggye Normal Fault System and its relationship to Southern Tibetan Detachment System

The Xainza-Dinggye Normal Fault System (XDNFS) is a large-scale nearly-north-south trending extensional structure across central and southern Tibet. Its middle segment developed in Tethys Himalaya with features of earlier magmatic core complex and later normal faults dipping moderately to northwest-west. The magmatic core complex is made up by mylonitic leucogrante with a low-angle detachment fault on the top of it and overlain by lower-grade meta-sedimentary rocks. The structural pattern of the southern segment of XDNFS take the shape of a detachment fault dipping to southeast-east with the High-Himalayan rock series as the lower plate. The Southern Tibetan Detachment System (STDS) is expressed as a ductile shear zone composed of mylonitic leucogranite in the studied area of this note. STDS was cut by the later XDNFS, which presents that nearly-east-west striking STDS is not the controlling or adjusting structure of the nearly-north-south trending extensional structures. The origin of nearly-north-south trending extensional structures in Tibet may be the result of deform ational partition of north-south compression.     

经验模态分解(EMD)在滚动轴承故障诊断中的应用

针对滚动轴承故障振动信号的非平稳特征，提出了基于经验模态分解(Empiri-cal Mode Decomposition，简称EMD)和神经网络的滚葡轴承故障诊断方法，首先对原始信号进行了经验模态分解，将其分解为多个平稳的固有模态函数(Intrinsic Mode functioll，简称IMF)之和，再选取若干个包含主要故障信息的IMF分量，并从中提取时城特征措标——峭度或裕度因子作为神经网络的输入参数来识别滚动轴承的故障模式，对滚动轴承的内圈、外圈故障信号的分析结果表明，以EMD为预处理器提取时域特征参数的神经网络诊断方法比直接从原信号中提取时域特征参数的诊断方法有更高的故障识剐率，可以准确、有效地识别滚动轴承的工作状态和故障类别。     

柴油机连杆螺栓松动故障的诊断

本研究对某6105型柴油机机体表面振动信号进行采集和分析，通过对测得的发动机正常运转和连杆螺栓松动两种情况下的时域波形的处理和比较，找出发动机连杆螺栓松动时信号的特征频率，为发动机的故障诊断提供技术支持。