齿轮泵的困油现象分析及其解决措施

为解决一直困扰齿轮泵发展问题的齿轮泵的困油现象,从斜齿轮泵和直齿轮泵的困油容积变化方面来分析困油现象,采用数学推导的方法,得出开设卸荷槽采用减小齿顶高系数来减小困油现象,同时也不增加齿轮泵的外形尺寸的结论,可以作为进一步研究作参考。     

基于Solidworks的齿轮泵工作原理动态仿真研究

为了提高学生对齿轮泵结构和工作原理的认识和掌握,本文介绍了基于Solidworks的齿轮泵工作原理动态仿真。通过对齿轮泵结构的分析,主要完成了齿轮泵组成零件的实体建模、零件的动态装配和工作原理的动态仿真。利用Solidworks软件制作的齿轮泵结构装配动态仿真和工作原理的动态仿真可以保存为AVI格式,有利于该仿真的普及和推广。     

偶数齿平面式复合齿轮泵的流量特性分析与仿真

本文介绍了偶数齿的平面式复合齿轮泵的结构原理,对平面式复合齿轮泵的流量特性进行了理论分析和仿真研究,得到了如下结论：与普通外啮合齿轮泵相比,齿数相同时,复合齿轮泵的排量、平均流量和瞬时流量均增加了一倍,而体积未增加一倍。因此,复合齿轮泵具有较高的功率密度。     

直线共轭齿廓内啮合齿轮泵内外转子的测量方法

讨论了直线共轭内啮合齿轮泵内外转子的测量方法,推导了圆棒测量跨距的计算公式,并通过实例计算和作图验证了此方法的正确性.应用量棒跨距值可以对转子的齿厚误差进行控制,为提高直线共轭齿廓内啮合齿轮泵内外转子的制造精度提供了理论依据.     

浅谈齿轮泵内部泄露的原因与对策

外啮合齿轮泵,它具有结构简单,制造方便,价格低廉,自吸能力强,维修容易和对油液的污染不敏感等特定。尤其是低压齿轮泵,被许多大型船舶用作滑油泵,为船舶柴油发电机原动机的自带滑油泵,船舶主机凸轮轴滑油泵及燃油泵等等。但在使用上发现了故障多,寿命低,引起了我们的关注。     

常压齿轮泵的故障分析

本文对常压齿轮泵经常发生的故障作了理论分析,并对各种克服故障的方法作了初略探讨。     

基于VRML的齿轮泵虚拟装配研究

鉴于传统CAD装配的不通用性,以齿轮泵为例,基于VRML技术,通过CAD建模以及数据转换再建虚拟场景,利用VRML的检测器和传感器等技术,结合Java和Java Applet等程序控制技术,建立了一个基于网络的虚拟装配仿真平台．     

齿轮泵瞬时流量分析及改善措施

对齿轮泵瞬时流量的变化规律以及产生流量脉动的原因进行了分析,指出了流量脉动对液压系统的不利影响,提出了降低流量脉动的具体措施。     

基于模糊理论的CB型齿轮泵可装配性评价

针对可装配性的特点,分析了影响可装配性的12个因素.基于模糊数学理论,采用模糊评价方法,提出了针对可装配性的模糊综合评价过程的实现方法.以CB型齿轮泵为例进行了具体的计算,对产品的可装配性作了评价分析.     

轻型平板货车改装直推式自卸车的要点及注意事项

目前自卸车的倾卸机构主要分为直推式和间接式两种形式,微型、轻型自卸货车较多采用结构简单,成本较低的直推式.着重介绍直推式自卸车的倾卸机构的设计、液压缸和齿轮泵的选择等要点及注意事项,为平板车改装后推式自卸车的设计提供参考.     

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?     

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.     

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…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.