仿生关节3自由度并联机构运动分析

自由度仿生关节并联机构具有结构紧凑、承载能力大和易于实现的特点.对3-DOF(RRS型)仿生关节并联机构进行结构原理设计,建立机构位移方程,设计仿生关节机构的结构参数并对其结论作出分析.     

仿生机械臂的结构设计分析

采用拟人法设计了一种五自由度的仿生机械臂,该臂主要采用蜗杆机构与齿轮机构相结合实现机械臂的运动,具有结构简单、运动可靠的优点。采用D-H法建立机构的数学模型,并对仿生机器臂进行了运动学分析。     

可重构并联实验装置设计及实践教学初探

给出可重构平面并联机构和空间并联机构的设计原则，概括进行并联机构设计的目的和相应的实验内容，针对不同应用对象，探讨开设此类实验课的途径和方法。通过探索和实践，取得较好的效果。     

Delta并联机器人的参数优化设计研究

结构参数优化是并联机器人运动学设计的最终目标。本文针对Delta机器人提出了一种结构参数优化设计方法。首先对机构进行运动学分析得到局部灵活度的性能评价指标,其次将局部性能评价指标综合为全域性能指标,将尺度综合问题归结为一类参数优化问题。该方法对这类以及其他并联机构的运动学设计理论有一定指导意义。     

仿生蛇形机器人结构研究与设计

蛇形机器人各种单元连接结构中,单关节内万向节连接形式具有单元少、结构协调性好等优点.从生物蛇身体结构出发,结合蛇形机器人工作环境,设计一种单关节内万向节连接形式的仿生蛇形机器人结构.对常用万向节结构所用十字轴的分体设计,简化了机器人的结构形式,机器人单元长度为91 mm,单元直径为80mm,机器人零件数量为521件.     

自由度并联腿机构运动学分析

提出了一种新型的2自由度并联腿机构模型,即2-UPS+U并联腿机构。与多自由度并联机器人相比,该并联腿机构具有结构简单、紧凑、承载能力大、累计误差小、造价低、无冗余约束等优点,在工业设计制造生产及其相关领域内具有广阔的应用前景。利用高等机构学对该并联腿机构进行了自由度分析、运动学分析和工作空间分析,为后期并联腿机构的运动规划以及控制奠定了理论基础。     

四足仿生机器人混联腿构型设计及比较分析

在机器人能研究领域当中,四足仿生机器人是一个十分重要部分.在此类机器人的研发当中,混联腿构型是一种较为常用的结构,其中对串联、并联等机构的特点进行融合,对于机器人的运动性能有着十分良好的提升.从自由度不同的角度,主要采用三种不同的构型,各自具有不同的特点.基于此,本文对四足仿生机器人混联腿构型的特点进行了分析,并且对不同构型进行了比较.     

仿生设计在景观设计中的实践应用

本文主要论述了仿生设计在景观设计中的实践应用,尊重自然遵循生态的原则,遵循生命的规律.通过对自然形态、结构、功能、材料、空间的效仿,使景观设计与自然世界的有机融合.对仿生设计的定义及仿生设计在景观设计中应用研究的内容进行阐述.其次从思维及思维方式阐述仿生设计对景观设计中运用的影响.并对在景观设计中如何应用形态仿生设计、结构仿生设计、功能仿生设计、材料仿生设计、空间仿生设计进行论述.最后阐述了在景观设计中运用仿生设计的意义.     

机械原理课程设计中机器人机构的动力学建模与仿真

为培养学生的机构分析能力,在机械原理课程设计中对3-PRR并联机器人机构动力学建模分析进行研究。推导出3-PRR并联机构位置反解、速度反解和加速度反解等方程。基于第2类拉格朗日方程建立3-PRR并联机器人机构逆动力学模型,据此求出各驱动关节的驱动力。在空载和负载两种情况下进行数值计算,经过与Adams仿真结果对比分析,验证了动力学建模的正确性。本研究为平面3自由度并联机器人机构运动学建模和动力学建模分析提供了有效的方法,为实物样机的优化设计奠定了理论基础。     

仿生柔性鳍波动推进水动力性能试验

仿生柔性鳍波动推进作为一种新型的水下航行器技术,具有操作性能优异、隐蔽性强、水动力性能强等优点.为探索仿生柔性鳍波动推进的水动力性能,设计并搭建了一款新型仿生柔性鳍试验机构,采用舵机-摆杆-波动鳍的传动方式,解决了机械结构和运动控制问题;从力学和流场对仿生柔性鳍的水动力性能进行试验验证.为仿生柔性鳍的深入研究提供了实验...     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…