连轧机用人字轮齿轴断裂失效分析

用宏观断口分析、化学检验、力学性能测定、低倍检查、金相组织及夹杂物评定鉴别、受力分析及强度寿命定量估算的方法，对人字轮被动齿轴端断裂失效原因进行分析，并提出改进措施。     

Failure analysis and wear mechanism study of a heavily loaded gear

Failure analysis and a study of the wear mechanism were performed on a heavily loaded carburized gear with some unusual features. The analysis showed that the different failure forms on the tooth surface of the gear were dependent on the sub-surface shearing stress, the lubrication conditions and the surface roughness. Delaminations formed on the addendum surface were the main reason for the gear failure. A suggestion for improvement has been tried, and a desirable result has been obtained.     

液压-齿轮-齿条圆弧分型抽芯压铸模设计

给出了龙头体液压-齿轮-齿条圆弧分型抽芯压铸模实用结构，论述了模具的浇铸系统、结构特点和工作原理。该模具采用扇形龄轮-齿条机构实现龙头体铸件的侧向圆弧分型抽芯，同时通过相应的两套斜销滑块机构分别实现龙头体铸件另外两个方向的侧向分型抽芯。     

齿轮精密成形精整毛坯设计

根据被整形工件的大小,提出优化的冷整形量,据此来确定冷整形前坯料的大小和温热成形时模具的参数。     

齿轮精锻的数值模拟与实验研究

本文对空心直齿圆柱齿轮的精锻成形过程进行三维刚塑性有限元模拟和实验研究。通过有限元数值模拟和实验研究 ,得出了直齿圆柱齿轮精锻过程的金属流动规律和变形力学特征 ,揭示了直齿圆柱齿轮精锻过程的变形机理 ,数值模拟结果与实验结果吻合较好     

潮汐双向流条件下丁坝水流特性研究

以长江口南支河段为原型,概化并建立水槽数学模型,研究径潮双向流条件下丁坝附近的水流结构。研究表明:丁坝一侧河岸,丁坝下游潮差远大于上游,在丁坝上游潮差小于对岸侧,下游潮差大于对岸侧;落潮时,丁坝回流区与壅水区长度大于涨潮,转流时刻,丁坝坝头附近流速相对较大;河床底部剪切应力变化在涨落急时刻最大,且落潮大于涨潮,转流时刻坝头及坝身迎水侧剪切应力增加明显。     

圆柱直齿轮超塑挤压的试验研究

对圆柱直齿轮的超塑性挤压进行了试验研究，其中挤压方式为径向挤压，试验材料为铅锡合金。试验中为降低成形力，采用了孔分流法。试验结果表明，用超塑挤压的方法加工圆柱直齿轮是可行的。孔分流方法在降低成形载荷与改善充填性方面具有优点，对生产实践具有指导意义。     

直齿圆柱齿轮挤压工艺实验

论述了温挤压成形时存在模具磨损与挤出齿轮件头部凸的问题,分析了其产生的原因与造成的后果.为了节约成本与生产顺利进行,采用冷挤压工艺方案进行工艺实验.实验研究了齿轮相关参数﹑挤压力估算﹑工艺过程与模具结构优化,成功地挤出直齿圆柱齿轮零件,经过分析比较,冷挤压挤出的齿轮零件表面质量比温挤压的好,而且没有发现模具磨损现象.实验表明,冷挤压工艺方案是可行的,且能提高模具寿命﹑改善齿轮件的表面质量和节约成本.     

基于数值模拟的直齿圆柱齿轮精锻模具设计

基于三维有限元数值模拟分析，确定了直齿圆柱齿轮精锻新工艺成形的最佳方案，并设计了可同时实现预锻分流区一分流终锻新工艺和传统闭式镦挤工艺的实验模具。     

An impulse control approach to dike height optimization

This paper determines the optimal timing of dike heightenings as well as the corresponding optimal dike heightenings to protect against floods. To derive the optimal policy, we design an algorithm based on the Impulse Control Maximum Principle. In this way, this paper presents one of the first real-life applications of the Impulse Control Maximum Principle developed by Blaquière. We show that the proposed impulse control (IC) approach performs better than dynamic programming with respect to computational time. This is caused by the fact that IC does not need discretization in time.