钻孔灌注桩后压浆技术的应用与效果

介绍了后压浆技术提高灌注桩承载力的作用机理，并列举了四栋高层住宅楼工程中的应用情况，经试验结果分析，指出后压浆技术能大大提高灌注桩的承载力。     

数值方法确定地基承载力特征值的探讨

介绍了目前地基承载力的确定方法，研究了数值计算的可行性，并对其数值计算地基承载力的可靠性进行验证，指出应进一步完善确定地基承载力的方法，更好地解决群桩基础承载力的确定问题。     

转向柱管承载能力的试验研究

在分析转向柱管花键部位应力集中情况的基础上,通过对某厂生产的转向柱管扭转破坏的试验研究,得到如下结论:①转向柱管的承载能力与其外花键齿与方向盘中心内花键齿之间的非接触区长度有关,以花键端部过渡圆弧的直径大小为宜;②安装方向盘总成时所施加在安装螺母上的拧紧力矩在70N.m左右时,转向柱管的承载能力最大。     

Hard disc drive air bearing design: modified DIRECT algorithm and its application to slider air bearing surface optimization

Hard disk drives continue to increase in areal data density. This requires air bearing sliders with lower and lower flying heights (FH). Also the uniformity of the FH and the flatness of the roll profile with radius become more critical as the FH gets lower. By using modern optimization techniques, it is possible to optimize slider air bearing surface (ABS) designs according to multiple design goals. In this paper, we discuss two modifications to the DIRECT algorithm: one to handle tolerance and one to deal with hidden constraints. Some numerical experiments were carried out using these modifications and the modified DIRECT algorithm was applied to slider ABS optimization. The results show that these two modifications can improve the efficiency of the DIRECT algorithm and they also provide more flexibility in slider ABS optimization.     

焦化厂门型吊改造

从门型吊承轨梁的受力分析入手．研究剖析了原结构产生裂纹的诸多原因．通过理论计算。做出了承轨梁与桁架连接接点的最佳设计．提出了符合现场实际情况的更换承轨梁的最佳方案，为类似设备改造提供了可借鉴的经验。     

临南油田夏52块沙三中泥质砂岩油层精细评价

临南油田夏 5 2块沙三中泥质砂岩油层分布广 ,未动用程度高 ,为了稳定产量 ,急需寻找可直接投产的泥质砂岩油层。本文利用相渗实验资料建立油相相对渗透率与含水饱和度关系 ,从而建立有效渗透率的解释模型。依据有效渗透率和有效厚度将泥质砂岩油层划分等级 ,分区评价 ,这不仅有利于合理开采和保护此类油层 ,降低其生产成本 ,也为预测此类油层产能提供依据     

Numerical simulation of slider dynamics during slider–disk contact

In this paper, the dynamic behavior of pico slider in contact with the disk was calculated. The analysis model consists of a simplified suspension model, an air bearing model, and a slider–disk contact model. The contact model consists of two elements. One is surface roughness model measured by Atomic Force Microscope (AFM) and the other is micro-waviness model. The dynamic behaviors of the tri-pad slider are calculated at several rotation speeds to investigate slider vibration modes during slider–disk contact. The slider oscillation frequency depends on the rotation speed and it saturates about twice as much as eigen frequency of air bearing pitch mode.     

视频特技切换台的原理与功能

本文较系统、通俗地介绍了模拟视频特技切换台的矩阵输入、混合/效果放大器(M/E)、下游键、系统控制和同步发生器等电路单元,介绍了特技切换台的切换、混合、扫变、键控的基本原理和功能。     

基于小波包和包络分析的滚动轴承故障自动诊断方法

提出了一种基于峭度-小波包-包络分析的滚动轴承故障自动诊断方法。首先用峭度系数判断是否出现故障,再针对故障轴承振动信号非平稳和调幅的特点,用小波包将信号分解到不同的节点上。然后将不同节点的重构信号做包络谱分析,将谱峰处的频率同滚动轴承内圈、外圈、滚珠、保持架等的故障频率进行对比分析,在此基础上,运用最小距离判别法则自动获得故障原因,从而实现滚动轴承故障的自动诊断。通过对实验中采集到的轴承振动信号进行分析,证明了该方法在轴承早期故障诊断中的有效性。     

发电机同轴励磁机电刷火花过大的原因及处理方法

本文对发电机同轴励磁机电刷火花过大的原因进行了分析．并针对这些原因提出了相应的处理办法。对规范励磁机的运行维护有很大的帮助。