化学清洗中不容忽视的步骤——钝化

对低压锅炉化学清洗中容易被忽视的“钝化”这一步骤，从理论上进行了探讨，并介绍了相应的钝化工艺及防腐措施     

石墨防爆片静态变形及应力分析

本文旨在通过对石墨防爆片的变形、应力分布及爆破压力的试验研究,探讨以石墨电极为原材料加工石墨防爆片的可行性。文中运用有限单元法及薄板理论对该防爆破片的应力分布做了初步分析,并以电测和爆破试验验证了以薄板理论为基础的爆破压力计算公式,可供进一步研究时参考。     

成形压力对氧化铝瓷球性能的影响

本文以不同的压力等静压成形瓷球，研究了成形压力对瓷球烧结温度、密度及耐磨性的影响。结果表明：在本研究系统内随着压力的增加瓷球的烧结温度下降，烧成温度范围拓宽。采用150MPa成形的瓷球密度最大且耐磨性最好。     

聚己二酸1,2-环己二醇酯的合成

采用正交实验方法,分别以钛酸四丁酯和对甲苯磺酸为催化剂,合成了聚己二酸1,2 环己二醇酯,对其合成工艺条件进行了研究,得出了最佳工艺条件。并以所得聚酯合成了具有透明度高、硬度大、耐磨、玻璃化温度高等优异性能的聚氨酯材料。     

汽车胎压监测系统的设计及其通信抗干扰研究

针对大多数直接式汽车胎压监测系统组件集成度低、体积和功耗较大等问题,提出了一种基于短距离无线通信ZigBee技术的新型胎压无线监测系统的设计。主要采用TI的CC2530芯片和英飞凌SP12集成式数字传感器,实现对汽车轮胎内部状态的实时监测。采用软硬件协同设计以降低系统功耗,并通过多点轮询通信方式和ZigBee高级加密设置保障了其无线通信的抗干扰能力。     

硅压阻式气压高度计的设计与实现

采用硅压阻式压力传感器,以ATmega88PA为控制器设计了气压高度计。内嵌全温度范围的曲面拟合算法进行温度补偿及线性化处理,解决了压力传感器的温漂和非线性问题,并用海拔高度与气压的关系计算高度。测量结果通过RS-485接口发送给上位机。测试结果表明,该气压高度计压力测量误差优于0.50‰,分辨率为0.01 h Pa,线性度为0.999 9;标准大气环境下高度测量误差为0.16 m,线性度为0.999 8。该气压高度计具有质量小、功耗低、精度高、工作可靠等优点。     

基于iFIX平台的模糊PID控制在锅炉主汽压力控制中的设计

针对三台煤粉锅炉控制效果差,自动投入率低,尤其是主汽压力(流量)波动较大,不仅经济效益低,而且对下游设备造成严重损害。对三台锅炉进行了技术改造,通过引入基于参数自适应Fuzzy-PID的控制算法,在基于VBA脚本的iFIX上实现这一算法,对锅炉控制进行优化指导,使锅炉自动投入率提高,主汽压力(流量)趋于稳定,锅炉处于较高效率下运行,提高了经济效益。     

基于悬臂梁称重传感器的圆弧刀研磨力测量仪设计

为解决双圆锥形圆弧刀研磨力在线测量难题,设计了杠杆原理为基础的圆弧刀研磨力测量仪,建立了圆弧刀与磨盘之间研磨力数学模型。该仪器采用悬臂梁称重传感器,并以DSP2812为主控芯片,实现了圆弧刀研磨力的在线采集、处理、存储及实时显示等功能。实验表明:仪器的称重传感精度优于0.15 N,圆弧刀研磨力变化范围降低28.8%,满足圆弧刀研制的需求。该仪器性能稳定,具有较好的实用价值,为高质量的圆弧刀研制和光栅刻划技术提供了技术保障。     

Relationship of threshold diameter and Darcean permeability in unconsolidated porous structures

Experiment was conducted on the threshold pressure for atmospheric air through unconsolidated narrow size distributed mini sphere and sand particles at low flow rates. The threshold diameter calculated from measured threshold pressure showed that it does not follow the traditional similarity theory. This is consistent with our experiment on accurate permeability measurement, and can be explained as a result of gas slip flow within such micro pore structure. Our current work tend to find the method to predict the permeability-threshold pressure relationship for unconsolidated porous structures.     

Solid phase compaction of polymeric powders: effects of compaction conditions on pressure and density variations

In a recent communication it was shown that the pressure losses during the solid phase compaction of a polymeric powder could be predicted from a simple relationship of the form:

$\text{P}{}_2\text{P}{}_1\text{=(K)}{}^{\mathrm{<mtext>h</mtext><mtext>d</mtext>}}$

where $\text{h}\text{D}$ is a function of the geometry of the compact. This has now been explored in more detail and it has been found that for PVdC and PVC the factor K is dependent on the rate of compaction and the die surface finish but is independent of compaction pressure and die diameter. To illustrate the effect of the pressure losses on the structural uniformity of the compacts, microhardness measurements were taken at a large number of points across a section of each sample. A computer plot of hardness contours provided a picture of the homogeneity of the sample which could be related to the compaction conditions and average density of the compact.