弹性金属塑料瓦推力轴承试验台的研制

以弹性金属塑料瓦推力轴承为研究对象，设计推力轴承试验台，研究弹性金属塑料瓦与普通金属轴瓦的性能区别，并为研究弹性金属塑料瓦推力轴承的起动过程作试验准备．     

浅谈EMP瓦在水电站使用中应注意的问题

通过对弹性金属塑料（EMP）瓦性能结构及其在使用中出现的各种异常现象的分析,阐述了在水电站弹性金属塑料瓦的安装、检修、运行与维护中应该注意的若干问题。     

双封油边斜——平面固定瓦推力轴承的最佳斜面比

对在斜—平面扇形固定瓦推力轴承瓦面的内、外径上同时设置封油边时,基本参数斜面比对轴承性能的影响进行分析和计算,提出这种结构的最佳斜面比.     

C6-3．43／0．49型汽轮机推力轴承前轴承轴瓦损坏原因分析及缺陷消除

对C6-3．43／0．49型汽轮机推力轴承前轴承轴瓦损坏原因做了分析,并提出了改进措施．     

重视汽车维护延长使用寿命

新材料,新技术的引入,使汽车的性能逐渐增强。面对现代汽车,对维修专业人员提出新的要求,必须转变旧的修理观念,树立新的维修意识。只重视修理而轻视维护、只重视经验手端,轻视仪器检测的修理工艺,已不适应现代汽车修理要求。现代汽车质量提高,大修期增长,坚持维护使汽车处于良好的条件下运行就会减少大修延长汽车使用,现举例说明。一、确保发动机轴承(瓦)润滑延长发动机寿命汽车发动机轴承(瓦)在机体中起支撑曲轴、限制曲轴串动、跳动,减少曲轴磨损作用。由于轴承(瓦)与曲轴相对高速运转,很易磨损。减少磨损的措施就是采取机油润滑,机油在压力的作用下,流入轴承(瓦)与曲轴之间,润滑油形成油膜,将轴瓦与曲轴隔开。发动机工作时,曲轴浮动在轴瓦间,轴瓦与曲轴不接触,从而达到减少磨损的目的。如果使用中长时间不检查发动机润滑油,润滑油缺少得不到补充或机油变质不能及时更换,发动机将因缺油烧坏轴承(瓦)或因润滑油变质,影响油膜的形成,加快轴承(瓦)的磨损。所以,发动机寿命的长短决定着使用和维护,按时清洗或更新机油滤清器防止杂质进入轴承,减少磨损也是这个道理。二、保证发动机冷却保持空气滤清减少气缸磨损活塞连杆机构是发动机的心脏,决定着发动机的性能。为...     

液体动压浮环式推力轴承的静特性及参数

建立了浮环式推力轴承的数学模型，分析了轴承的承载能力、摩擦功耗、温升、浮环－转子的转速比等静态特性及结构参数．实验验证了理论计算的正确性．     

水轮发电机瓦温过高引起的停机事故原因分析及处理措施

探讨了灯泡贯流式水轮发电机水导轴承瓦温跳变引起事机组故停机的原因,通过对现有水机保护回路启动条件增加判断条件方式对电气二次回路进行改造。改造后运行情况表明,有效地降低了发电机水导轴承瓦温过高引起的事故发生率,且满足机组安全、稳定、可靠运行的要求。     

一起汽轮机推力瓦温度异常升高的事故分析

介绍了某135MW机组升负荷过程中出现的汽轮机正向推力瓦温度异常升高的事故过程,进行了原因分析,并提出了预防措施。     

高线摩根精轧机组增速机改造

针对高线摩根精轧机组增速机轴承和弹性垫片使用寿命短,输入轴断轴等事故进行分析探讨,通过对增速机输出轴轴承、输入轴及相关配合零件的改造,取得较好的使用效果。     

波浪滑翔机弹性水翼性能模型试验

波浪滑翔机的推力是由一组可以随着机体自动翻转的水翼来获得的。通过波浪水池模型试验对波浪滑翔机弹性水翼性能进行了研究,制作了波浪滑翔机水下牵引机的1:2.5缩尺模型,利用自制的垂荡激励拖车连接水下牵引机模拟在不同波高条件,分析不同情况下弹性水翼的性能。试验表明,波浪滑翔机水翼弹簧刚度应该根据工作海域的海况选取,海况较恶劣的海域波浪滑翔机弹性水翼可以选择较大的弹簧刚度;反之,水翼刚度不宜过大。     

推力轴承的力学特性

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｓｉｎｃｅ 1990 ,ａｎｉｍｐｏｒｔａｎｔｄｉｓｃｏｖｅｒｙｉｎｒｏｔｏｒ ｈｙｄｒｏ ｄｙｎａｍｉｃｂｅａｒｉｎｇｓｙｓｔｅｍｄｙｎａｍｉｃｓｉｓｔｈｅｃｏｕｐｌｅｄａｃ ｔｉｏｎｏｆｔｈｒｕｓｔｂｅａｒｉｎｇｕｐｏｎｔｈｅｌａｔｅｒａｌｖｉｂｒａｔｉｏｎｉｎａｒｏｔｏｒｓｙｓｔｅｍ .Ｉｎｔｈｅ ｐｉｏｎｅｅｒｉｎｇｒｅｓｅａｒｃｈｏｆＭｉｔｔｗｏｌｌｅｎｅｔａｌ .( 1990 ) [1] ,ａｓｅｒｉｅｓｏｆｒｏｔｏｒ ｄｙｎａｍ ｉｃｃｏｅｆｆｉｃｉｅｎｔｓｏｆｔｈｒｕｓｔｍａｇｎｅ…     

New analytical solution for the analysis and design of permanent magnet thrust bearings

On the basis of the current sheet model, a new analytical solution for permanent magnet （PM） bearings is developed. Compared with analytical methods based on the coupling energy model and the magnetic dipole model, the proposed one is more physically intuitive and convenient for engineering designers. According to the analytical model, the thrust characteristics of a novel PM thrust bearing is studied and verified by finite element analysis （FEA）. In the proposed thrust bearing configuration, the rotor is composed of stacked PM tings with alternative axial magnetization directions, and the stator with alternative radial magnetization directions while copper rings are used to separate adjacent PM rings. A prototype PM thrust bearing with the proposed configuration is designed and fabricated. The performances of the PM thrust beating are experimentally validated. It is shown that the calculation accuracy of the presented analytical solution is satisfying.     

The Analysis of Performance on Spring Supported Thrust Pads Inclusive of One Dimensional Pressure Buildup

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｗｉｔｈｔｈｅｉｎｃｒｅａｓｉｎｇｃａｐａｃｉｔｙｏｆｈｙｄｒｏｇｅｎｅｒａｔｏｒｓａｎｄｔｈｅｒｅｌｅｖａｎｔｌｙｉｎｃｒｅａｓｉｎｇｓｉｚｅａｎｄｌｏａｄｉｎｇｏｆｔｈｒｕｓｔｂｅａｒｉｎｇｓ,ｔｈｅｃｏｎｆｉｇｕｒａｔｉｏｎｏｆｐａｄｓｕｐｐｏｒｔｅｄｏｎａｓｉｎｇｌｅｐｉｖｏｔｈａｓｍｏｒｅａｎｄｍｏｒｅｄｉｆｆｉｃｕｌｔｙｉｎｍｅｅｔｉｎｇａｌｌｔｈｅｄｅｍａｎｄｓｉｎｒｅａｌｏｐｅｒａｔｉｏｎｃｏｎｄｉｔｉｏｎｓ．Ｔｈｅｃｏｎｆｉｇｕｒａｔｉｏｎ…     

论证券交易中的典型市场操纵行为的认定--基于美国、日本和中国台湾地区证交法的比较研究

通过对美国、日本和中国台湾地区的证券法的比较研究，阐明了洗售、相对委托和连续交易这三种典型的市场操纵行为的构成要件。     

弹用涡喷发动机地面起动试验研究

为获得弹用涡喷发动机的起动性能参数,设计了发动机地面起动试验系统。系统由发动机试车台、信号采集测量系统、时序控制系统、供油系统、高压吹转系统等分系统组成。利用该系统对某型弹用涡喷发动机进行地面起动试验,获得发动机转速,推力,压气机出口压力等参数,利用试验数据获得发动机起动性能。试验结果表明,该发动机具有快速的起动加速性和较好的起动可靠性。     

水压轴向柱塞马达配流盘的研究

This paper has introduced the developments of water hydraulic axial piston equipments.According to the effects of physicochemical properties of water on water hydraulic components,a novel valve plate for water hydraulic axial motor has been put forward,whose moment exerted by the fluid field between valve plate and bearing plate is balanced entirely.The material screening experiment of valve plate is done on the test rig.Through numerical simulation the effects of some geometry parameters on the performance of water hydraulic motor have been studied.The silencing grooves on the valve plate in water hydraulic motor can reduce the pressure shock and the occurrence of cavitation effectively.It is evident that the appropriate structure should change the wear status between matching paris and reduces the wear and specific pressure of the matching pairs.The specimen with the new type valve plate is used in a tool system.     

高校学生学习权初探

随着依法治校进程的加快和高校学生维权意识的增强,维护高校学生正当的学习权利已经引起教育界、法学界高度关注。受教育者的权利可分为两部分,一部分是受教育者作为公民应享有的权利;另一部分是受教育者作为学生应享有的权利。这两部分权利兼有自由权、社会权属性。按传统理论,对于侵犯他人自由权的行为可以诉诸司法救济,但社会权不具有司法可诉性。高校学生学习权的主要内容有学习自主权、学习保障权、学习成果享受权以及法律法规所规定的其它权力。行使这些权力,应遵守:有利于学习的原则;依法维护学生学习的合法权利,就必须理清教育法理。完善法律机制和健全监督机制。     

The effect of delayed-JOLs and sentence generation on children’s monitoring accuracy and regulation of idiom study

When studying verbal materials, both adults and children are often poor at accurately monitoring their level of learning and regulating their subsequent restudy of materials, which leads to suboptimal test performance. The present experiment investigated how monitoring accuracy and regulation of study could be improved when learning idiomatic phrases. Elementary school children (fourth and sixth-graders) were instructed to predict their test performance by providing judgments of learning (JOLs). They provided JOLs immediately after studying each idiom, after studying all idioms, or after studying all idioms followed by generating sentences in which the idioms were used. Correlations between JOLs and test performance showed that delayed-JOLs and delayed-JOLs with sentence generation were more accurate than immediate JOLs. JOLs after sentence generation also improved regulation of study compared to delayed-JOLs only. Analyses of JOL reaction times suggest that delayed-JOLs led children to retrieve the literal meaning of the idiom, whereas JOLs after sentence generation led children to focus on connections between studied information, contextual information, and prior knowledge. Sentence generation presents a promising method to improve regulation of study, and thus idiom learning.     

Relevance,Application, and the Development of an Unlikely Theory

This paper advances the argument that motor learning research is not relevant to the needs and interests of motor skill teachers. The principal reason is that motor learning researchers in university departments of physical education have responded to calls for paradigmatic shifts that were intended for experimental psychologists, not necessarily for researchers from departments of physical education. As a result, motor learning researchers have concentrated their efforts on studying the mechanisms underlying motor performance rather than on devising and testing ways to improve motor performance. The body of knowledge produced by this approach has been based on experiments employing laboratory tasks and treatment conditions that lack fidelity to those appropriate or even possible in real-world teaching environments. Consequently, little knowledge has been produced that can be directly applied to the technical aspects of teaching. It also is argued that progress toward an applied thrust has been hindered because energies of the most capable researchers have been spent on attempts to develop a grand theory of motor skills, a theory that can never emerge until researchers attend to the essential preliminary task of defining motor skills.