基于堆叠深度卷积沙漏网络的步态识别

提出了一种基于堆叠深度卷积沙漏网络的步态识别方法。为了解决人体建模中关节点准确定位的问题，采用基于深度卷积的沙漏网络来提取步态图上的关节点坐标，并计算肘关节与膝关节的角度作为运动特征。为了解决行走速度变化带来的影响，采用动态时间规整（Dynamic Time Warping）对特征序列进行距离计算。通过最近邻分类器对结果进行准确分类。该方法在公共CASIA-B数据集与TUM-GAID数据集上进行了验证并与其他方法进行比较，结果表明该方法有较高的识别率。     

Development of insertion-type peristalsis pump using pneumatic artificial muscles

This study aims to develop a new type of peristaltic pump that transports high-viscosity and solid–liquid mixture fluids. Pumps capable of transporting such fluids are essential in various situations such as factory transportation, outdoors, and emergencies. These fluids are conventionally transported by positive-displacement and rotodynamic pumps. However, solid–liquid fluids could collide with the impeller of the rotodynamic pump and thereby damage the pump, whereas the positive-displacement pump must be sufficiently large to apply high pressure to the transported fluid. A small pump that can transport these fluids would save factory space and enable outdoor applications such as dredging operations. Thus, we adopted earthworm peristalsis as a model mechanism of fluid transport within a standard plumbing infrastructure. The insertion-type peristaltic pump developed in this study uses an artificial rubber muscle to achieve an earthworm-like mechanism. The capability and energy efficiency of the mechanism is evaluated in water transportation experiments.     

蜗轮蜗杆的参数化设计与绘图

机械产品的数字化设计与制造是制造业信息化的重要内容,而数字化设计包括参数的优化和计算机辅助绘图等内容。介绍了在AUTOCAD2002应用环境下,用VB6.0开发的集蜗轮蜗杆参数优化计算及参数化绘图为一体的计算机辅助设计系统,它集优化设计与绘图一体化,大大缩短了设计时间,提高了设计质量。     

硅灰裹石掺掺合料混凝土耐久性研究

本文研究了硅灰裹石掺合料体系对混凝土耐久性影响，研究结果表明，混凝土中水泥浆体与集料之间界面过渡区是混凝土耐久性的薄弱区域。采用硅灰裹石掺掺合料工艺可以使混凝土抗氯离子渗透能力比普通混凝土提高30倍，抗硫酸盐侵蚀能力提高3倍以上，抗冻融循环能力提高3倍以上。     

熔盐堆中气泡分离器内部流场的数值模拟

气泡分离器是熔盐堆脱气系统中不可或缺的关键设备之一，通过离心分离的方式去除反应堆中氙等裂变气体及其载气。本文利用CFD软件Fluent，采用瞬态的二次压应力雷诺应力模型，对气泡分离器内部液相流场进行了数值模拟。分析了边界条件变化对分离器分离特性的影响。结果表明：系统压力对切向速度分布、压力分布及轴向零速包络面的结构均有较大影响，进而影响设备的分离特性。另外，对比计算结果与实验现象，也可看出，增加出口压力有利于气液分离。     

环轧模拟中单元畸变的处理

针对环轧成形模拟所采用的动力显式算法由于沙漏而造成单元畸变的问题,研究了沙漏控制方法,分析了矩形截面环件轧制的成形过程.环轧初始阶段,环件变形量小,沙漏能很小;随变形量增大,控制沙漏所需沙漏能持续增长.采用人工阻尼法需要的沙漏能可达内能的20％,而采用人工刚度法所需沙漏能明显减小,只占内能的5％左右,能减小沙漏能对内能...     

Mathematical model and tooth surfaces of recess action worm gears with double-depth teeth

In this study, the surface equations of recess action (RA) worm gears with double-depth teeth, generated by a ZN worm-type hob cutter, are proposed. Based on the generation mechanism and the theory of gearing, a mathematical model of a series of worm gears, semi RA, full RA and standard proportional tooth types, with double-depth teeth is developed as the function of design parameters of the ZN worm-type hob cutter. According to the derived tooth surface equations, computer graphs of a series of worm gears with double-depth teeth are plotted. Tooth surface variations of the generated RA worm gears due to the varying pitch line, pressure angle and tooth height of the hob cutter are also investigated.     

蜗杆斜齿轮传动重合度的研究

以汽车座椅角度调节驱动器为例介绍金属蜗杆与塑料斜齿轮传动副的应用。在参考文献的基础上推导出蜗杆斜齿轮传动重合度公式,分别绘制出压力角an、齿顶高系数han、变位系数x、蜗杆分度圆导程角γ、斜齿轮齿数z2对重合度的曲线图并分析各参数对重合度的影响。     

分度蜗杆副制造品质的提高方案

介绍了某厂滚齿机、插齿机、数控回转工作台等产品的关键部件——分度蜗杆副的制造,系统地分析了从设计图样、工艺路线、加工设备直至刀具、检验测量各个环节存在的问题,提出了攻关方案并付诸实施,取得了很好的成绩,制造精度由6~5级提高至4级。     

XL400设备头架蜗轮严重磨损研究

针对专用设备头架传动机构上的蜗轮磨损过快问题,用蜗轮齿面的接触疲劳强度计算对蜗轮的磨损进行研究,提出了解决措施:用直廓环面蜗杆传动替代阿基米德蜗杆传动,实践表明此法简单可行,是解决蜗轮磨损问题的良好方法。