滚动轴承远程故障诊断实验系统设计

针对滚动轴承实验需求,提出一种基于LabVIEW开发的远程滚动轴承故障诊断实验系统。该实验系统通过校园网进行远程实验操作,通过实验客户端,可以完成振动实验台的控制和监视,滚动轴承振动信号的采集和分析。信号采集可以同时采集X轴、Y轴和Z轴三个方向的振动信号。滚动轴承振动信号的分析方法包括共振解调法、短时Fourier变换、Hilbert-Huang变换、小波变换和自适应最优核(AOK)时频分析等方法。应用表明,该实验系统使用简单方便,可以节约实验成本,最大限度利用实验室资源,能够满足滚动轴承故障诊断实验的要求,也为滚动轴承故障诊断方法的研究提供了实验设备支持。     

Cycling

The resistance against a cyclist while riding on rollers is due mainly to rolling resistance produced by the deformation of the tyre as it rolls against small diameter drums. Resistance is then combined with wheel speed to set power output. The effect of tyre pressure and cross‐section on power was investigated by systematically altering the pressure (552 kPa, 690 kPa, and 827 kPa) in a 20c, 23c, 25c, and 28c tyre of the same design while riding at a wheel speed of 45 kph. Average power over 1 minute was measured with a Power Tap Hub (Tune Corporation, Cambridge, Massachusetts, USA) on five occasions. Statistical significance was evaluated at p < 0.05. Power requirements increased significantly with each reduction in tyre pressure for all tyres and pressures except the 25c between 690 and 827 kPa. The 20c tyre required significantly more power from the cyclist at each tested tyre pressure when compared to the other tyres (which were not different from each other). The differences in resistance from tyre size were not observed when ridden on the road. Additionally, a slightly different tyre design from the same manufacturer responded similarly in the 20c, but was significantly different in the 23c size. It was also observed that power requirements increased significantly when both the wheels were ridden on the rollers as compared to just the rear wheel. These results indicate that the power requirements may be significantly altered by the cyclist by adjusting tyre pressure, tyre cross‐section size, tyre type, and with the number of wheels contacting the rollers. However, the magnitude of these power requirements may not be suitable for intense workouts of trained cyclists.     

双金属轧片管在发电厂空冷器中的应用

通过对绕簧管和双金属轧片管的性能分析比较,选取双金属轧片管对发电厂中的绕簧管空冷器进行合理设计改造,使其提高传热效率、降低流动阻力,达到节能降耗、提高效益目的。根据改造的结果以及在实际应用中看,采用双金属轧片管空冷器在发电机的空气冷却上各项参数均优于原绕簧管空冷器,达到了要求。证明双金属轧片管空冷器在发电厂中有很好的应用价值,在其它类似的场合中也值得应用推广。     

制绳钢丝用盘条SWRH82A的冶炼及轧制工艺研究

介绍了武钢钢丝绳用SWRH82A盘条的试制开发过程:采用氧气顶底复吹转炉和钢包吹氩搅拌工艺炼钢,应用先进的炉外精炼技术来改善夹杂物,制定合理的加热、轧制及控冷工艺。用户使用结果证明武钢SWRH82A盘条完全可以顶替进口盘条制作制绳钢丝,取得了良好社会效益。     

冷轧变形对连铸连轧5005铝合金再结晶织构的影响

采用X射线衍射仪研究了冷轧变形对连铸连轧5005铝合金再结晶织构的影响。结果表明:5005铝合金热轧带材具有强的β纤维轧制织构,随着冷轧变形量的增加,β纤维轧制织构的强度增大。经399℃保温3h再结晶退火处理后,5005铝合金热轧带材获得强的cube织构和弱的R织构,随着变形量的增加,cube织构强度降低,而R织构强度增加,当冷轧变形量达到93.1%时,再结晶织构由强的R织构组分及弱的cube和P织构组分构成。     

热轧钢带冷却过程建模及自动控制研究

通过研究热轧钢带的冷却过程,对其温度的变换进行了建模分析。根据所建立了数学模型,提出了基于反馈控制原理的温度控制方案,给出了反馈卷取温度控制的详细控制过程,最后结合实际的工作特点,对模型进行了分析与修正。     

南宋泉州官私刻书考述

通过对南宋泉州的13位官私刻书家的所刊刻的图书,以及刻本的存佚,刻书家的生平等基本情况的简要分析和考证。提出了南宋时期泉州的坊刻并不发达、使泉州成为南宋刻书“诸州之冠”的,应归功于当时在泉州任职的地方官员的新观点。     

水泥粉磨系统的改进

从水泥生产实践出发，分析总结了影响水泥磨机台时产量、细度合格率的主要原因，并阐述了技改措施。     

武钢冷轧厂五机架工作辊断裂原因分析及改进措施

武钢冷轧厂五机架H112号工作辊在使用中发生粉碎性断裂，断为12片碎块，如此严重的断辊是开工以来从过的，本文对此作出失效分析，包括化学成分，金相组织，微观断口和夹杂物等内容，并提出改进措施。     

热轧FW2轧辊传动接手辊端断裂事故分析

轧机轧辊辊端与传动接手等在生产过程中瞬间发生断裂事故，造成一系列损失。通过分析调查，推断出事故发生的全过程，确定造成此次事故的原因主要由于轧机的液压润滑系统及环境因素造成的,并以此制定出预防类似事故发生的措施。