耐高温环氧改性硅树脂防腐涂料的研制

采用环氧改性硅树脂和固化剂为主要原料 ,同时以铝粉为颜料 ,以无机硅酸盐为填料 ,研制出耐高温防腐蚀涂料 ,并进行该涂料的性能测试 ,同时在生产中试运行。     

Analysis of oil consumption in cylinder of diesel engine for optimization of piston rings

The performance and particulate emission of a diesel engine are affected by the consumption of lubricating oil.Most studies on oil consumption mechanism of the cylinder have been done by using the experimental method,however they are very costly.Therefore,it is very necessary to study oil consumption mechanism of the cylinder and obtain the accurate results by the calculation method.Firstly,four main modes of lubricating oil consumption in cylinder are analyzed and then the oil consumption rate under common working conditions are calculated for the four modes based on an engine.Then,the factors that affect the lubricating oil consumption such as working conditions,the second ring closed gap,the elastic force of the piston rings are also investigated for the four modes.The calculation results show that most of the lubricating oil is consumed by evaporation on the liner surface.Besides,there are three other findings:(1) The oil evaporation from the liner is determined by the working condition of an engine;(2) The increase of the ring closed gap reduces the oil blow through the top ring end gap but increases blow-by;(3) With the increase of the elastic force of the ring,both the left oil film thickness and the oil throw-off at the top ring decrease.The oil scraping of the piston top edge is consequently reduced while the friction loss between the rings and the liner increases.A neural network prediction model of the lubricating oil consumption in cylinder is established based on the BP neural network theory,and then the model is trained and validated.The main piston rings parameters which affect the oil consumption are optimized by using the BP neural network prediction model and the prediction accuracy of this BP neural network is within 8%,which is acceptable for normal engineering applications.The oil consumption is also measured experimentally.The relative errors of the calculated and experimental values are less than 10%,verifying the validity of the simulation results.Applying the established simulation model and the validated BP network model is able to generate numerical results with sufficient accuracy,which significantly reduces experimental work and provides guidance for the optimal design of the piston rings diesel engines.     

环的广义单内射性

引入了广义单内射环的概念,并证明了它是单内射环和n-(f-)内射环的真推广.研究了广义单内射环的一些性质,并用环的广义单内射性给出了QF的新刻画.特别地,推广了已知的相关结论.     

运动模糊图像恢复在汽车同步环检测中的应用

同步环是汽车变速箱的关键零件，同步环漏装会产生传动轴打齿现象，严重影响汽车的安全性能和使用寿命。采用机器视觉技术对同步环装配与否进行检测，是一种高效准确的在线检测方法。由于在生产线上水平运动的同步环和静止的摄像机之间存在相对运动，因此摄像机采集的图像模糊不清。针对运动模糊图像的复原算法进行了研究，分析了其退化的原因，建立了图像复原的数学模型，并根据图像复原的数学模型对运动模糊图像进行了图像复原处理，为后续图像处理做好了前期准备，并取得了令人满意的效果。     

无油润滑空压机填料密封环的摩擦特性

在往复式无油润滑压缩机装置上,试验研究了普通填充聚四氟乙烯(PTFE)、30%碳纤维增强PTFE和C/C+PTFE三种不同材料填料密封环的摩擦力、摩擦功率和摩擦温度。结果表明,普通填充PTFE材料的摩擦力受活塞平均滑行速度的影响最大,其摩擦功率和摩擦温度也最大。虽然C/C+PTFE的摩擦功率略高于30%碳纤维增强PTFE,但其摩擦温度比30%碳纤维增强PTFE低。由于C/C+PTFE具有非常良好的力学性能和较好摩擦特性,它有望成为高压、高速工作条件下的密封环材料。     

气体钻水平井的携岩CFD数值模拟研究

文章研究了气体钻水平井的携岩问题，发现水平井气体携岩的规律与垂直井有本质不同。目前国际上流行的斜井、水平井气体钻井流动计算与井下真实情况相比有很大差别，从而导致计算得到的携岩气体需求量过于偏小，难以保证井下正常携岩、清岩。用CFD软件对水平井段钻柱躺在下井壁，并造成偏心环空内流体的问题进行了大量不同工况下的流场分析，其研究结果对改善环空流场、确定合理的输气量参数、提高流体的携岩能力等，提供了理论依据。     

近红外光谱仪器技术

综述了常用的几种类型近红外光谱仪器及其各自的工作原理及优缺点，并给出了具有代表性的近红外仪器厂商及其Internet网址和仪器类型。     

过滤电弧沉积的TiN/TiCrN/CrN/CrTiN多层膜

用过滤电弧技术在高速钢表面沉积了TiN／TiCrN／CrN／CrTiN多层膜，用扫描电镜(SEM)观察了截面和断口形貌及划痕后的形貌。使用俄歇电子谱仪进行剥层成分分析，用纳米压痕仪测试了多层膜和单层膜的显微硬度和弹性模量。结果表明，在调制周期大于l00nm时，多层膜的显微硬度符合Ha11—Petch关系，在80nm时，则脱离线性关系。划痕法测试多层膜的结合力达到80N。     

Galois环上循环码新的表示

近年来,在编码理论中,Galois环上码的研究成为编码理论工作者研究的一个热点。定义了Galois环上循环码的离散傅里叶变换及Mattson-Solomon（MS）多项式,证明了Galois环上的循环码同构于Galois环的Galois 扩张的理想。     

辐射固化涂料及其发展

综述了红外线固化、紫外线固化和电子束固化等辐射固化涂料所用的设备、固化机理、涂料组成、它们的共性及区别,从涂料和涂膜性能、节省能源、环境友好等方面比较了辐射固化涂料和传统涂料,并展望了辐射固化涂料的发展前景。