浅谈电子汽车稀的应用现状与展望

电子汽车衡以其计量迅速准确，功能多，质量稳定，操作方便，价格适宜等优点，已被人们所认识。作者通过本地区近些年来使用固定式机械秤和电子汽车衡的情况，对电子衡今后的应用予以了展望。     

大型球面天线线馈源结构光机电综合设计研究

结合球面望远镜线馈源结构的特点,提出了一种球面望远镜线馈源结构的光机电一体化设计新方案,并对悬索结构的非线性静动力分析进行了初步探索．     

圆盘超声电机准零刚度转子设计及其优化

该文针对长时间储存和高冲击环境导致超声电机正常工作预压力发生改变的背景,设计了一种受到外部环境扰动保持预压力恒定的准零刚度碟簧转子。借鉴了开槽碟簧设计思路,建立其参数化有限元模型。采用灵敏度分析选择主要设计变量,建立了在选定工作预压力附近准零刚度段最长的目标函数。利用有限元数值模型对该碟簧转子进行参数优化设计。结果表明,优化后的碟簧转子在正常工作预压力附近准零刚度段的长度达到0.6 mm,且在冲击环境下满足强度要求,最终通过实验验证了装配有该碟簧转子超声电机的输出特性良好。     

45m^2燃油高效节能玻璃窑炉的设计简介

本文介绍了一座45m2燃油高效节能玻璃窑炉在设计中所采用的主要技术参数,以及窑炉小炉、火燃空间、加料口、窑坎等关键部位所采用的结构形式,并列出了窑炉关键部位材料的选用情况,具有较强的实际指导意义.     

Electron theory study on the effect of Mn on as-cast structure of Fe-C-Cr-Mn cast irons

The valence electron structure of alloying austenite of 3C-15Cr high chromium white cast iron with different Mn contents from 1% to 6% is analyzed by BLD method and EET. Results show that the addition of Mn has major influence on the valence electron structure of the alloying austenite, especially on that of Fe-C, Fe-C-Cr and Fe-C-Cr-Mn unit cells of it. The effect becomes weak when Mn content is over 4%. Based on the effect of n~, F~~, the weighting of each unit cell and the degree of undercooling on phase transition of the aus- tenite, we can calculate the retained austenite content of as-cast structure of the high chromium white cast iron. The calculation results coincide well with those of the experiment. The phase transition characters of the austenite in high chromium white cast iron can be forecasted through valence electron structure analysis of alloying austenite by BLD method and EET on the basis of Fe-C-Cr equilibrium phase diagram.     

Influences of copper on solidification structure and hardening behavior of high chromium cast irons

The influences of copper on microstructure and the hardening behavior of high chromium cast irons subjected to sub-critical treatment were investigated. The results show that the microstructure of the as-cast high chromium cast irons consists of retained austenite, martensite and M1C3 type eutectic carbide. When copper is added into high chromium cast irons, austenite and carbide contents are increased. The increased addition of copper content from 0% to 1.84% leads to the increase of austenite and carbide from 15.9% and 20. 0% to 61.0% and 35.5% , respectively. In the process of sub-critical treatment, the retained austenite in the matrix can be precipitated into secondary carbides and then transforms into martensite in cooling process, which causes the secondary hardening of the alloy under sub-critical treatment. High chromium cast irons containing copper in sub-critical treatment appear the second hardening curve peak due to the precipitation of copper from supersaturated matrix.     

基于优惠券激励的需求响应双层优化机制

提出了一种用户自主参与的需求响应(Customer Voluntary Demand Response, CVDR)计划,电力企业为用户提供优惠券激励,鼓励用户在尖峰电价时减少用电需求。电力企业通过实施CVDR计划降低自身尖峰电价的购电经济损失,同时用户在优惠券激励作用下提升收益。因此提出了电力企业和用户之间合作博弈的双层优化模型,结合Karush-Kuhn-Tucker条件和Big-M法将双层优化转化为一个单层混合整数线性问题进行求解。算例仿真采用居民和小商业配电网,通过数值分析验证CVDR计划增强了用户的收益,减少了电力企业经济损失,实现了调峰需求。     

机械设计系列课程改革的目标与实践

本文是与机械设计相关的五门课程配套进行改革实践的经验总结。这些经验主要是：确定机械设计相关课程的改革目标，精简重复内容，加强各门课程之间的联系与配合，提高学生的综合设计能力。