微秒级脉冲辉光放电与直流辉光放电离子源特性比较

利用自制飞行时间质谱仪（ＴＯＦＭＳ）比较了微秒级脉冲辉光放电（μｓ－ｐｕｌｓｅＧＤ）与直流辉光放电（ｄｃ－ＧＤ）离子源的特性。讨论了两种放电模式的伏安特性以及放电参数对ｄｃ－ＧＤＴＯＦＭＳ质谱信号强度的影响,给出了用ｄｃ－ＧＤ与μｓ－ｐｕｌｓｅＧＤ获得的质谱图,实验结果表明,与ｄｃ－ＧＤ相比,μｓ－ｐｕｌｓｅＧＤ作为ＴＯＦＭＳ的离子源有更多的优越性,在直接固体样品分析和表面逐层分析等领域有良好的应     

硬质合金可转位刀具CAD/CAM系统工程图的设计

为提高竞争能力,适应技术和市场快速发展的需要,我厂以多品种、小批量的硬质合金可转位浅孔钻为先导,应用ＩＤＥＡＳＭａｓｔｅｒＳｅｒｉｅｓ软件,开发了硬质合金可转位浅孔钻ＣＡＤ系统(ＣＣＴＣＡＤＡＭＳ)。在此系统中,Ｄｒａｆｔｉｎｇｄｅｔａｉｌ作为ＩＤＥＡＳＭ?..     

STUDY ON PROPERTIES OF RECLAIMED SODIUM SILICATE SAND

ＳＴＵＤＹＯＮＰＲＯＰＥＲＴＩＥＳＯＦＲＥＣＬＡＩＭＥＤＳＯＤＩＵＭＳＩＬＩＣＡＴＥＳＡＮＤ①ＺｈａｏＧｕｏｐｉｎｇＪｉａｎｇＺｏｎｇｙｕＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＥｎｇｉｎｅｅｒｉｎｇ,ＪｉａｎｇｓｕＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅ...     

STUDY ON LOADS AND CONTACT STRESSES FOR TOROIDAL DRIVE

ＳＴＵＤＹＯＮＬＯＡＤＳＡＮＤＣＯＮＴＡＣＴＳＴＲＥＳＳＥＳＦＯＲＴＯＲＯＩＤＡＬＤＲＩＶＥＸｕＬｉｚｈｏｎｇＹａｎｓｈａｎＵｎｉｖｅｒｓｉｔｙＡｂｓｔｒａｃｔＴｈｅｌｏａｄｄｉｓｔｒｉｂｕｔｉｏｎａｎｄｃａｌｃｕｌａｔｉｎｇｆｏｒｍｕｌａｅｏｆｔｈ...     

METHOD OF CLASSIFYING GRASPS BY ROBOT HANDS

ＭＥＴＨＯＤＯＦＣＬＡＳＳＩＦＹＩＮＧＧＲＡＳＰＳＢＹＲＯＢＯＴＨＡＮＤＳＺｈａｎｇＹｕｒｕ（ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓａｎｄＡｓｔｒｏｎａｕｔｉｃｓＷｉｌｌｉａｍＡ．ＧｒｕｖｅｒＳｉｍｏｎＦｒａｓｅｒＵｎｉｖｅｒｓ...     

SIMULATION STUDY ON CAPACITOR DISCHARGE PERCUSION WELDING

ＳＩＭＵＬＡＴＩＯＮＳＴＵＤＹＯＮＣＡＰＡＣＩＴＯＲＤＩＳＣＨＡＲＧＥＰＥＲＣＵＳＩＯＮＷＥＬＤＩＮＧＳｈａｎＰｉｎｇＷａｎｇＸｕＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙＡｂｓｔｒａｃｔＢａｓｅｄｏｎｔｈｅｎｅｔｗｏｒｋｔｈｅｏｒｙ，ｔｈｅｄｉｓｃｈａｒｇ...     

TOOL DESIGN OF ELECTROCHEMICAL MACHINING WITH PASSIVATED ELECTROLYTE

ＴＯＯＬＤＥＳＩＧＮＯＦＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＭＡＣＨＩＮＩＮＧＷＩＴＨＰＡＳＳＩＶＡＴＥＤＥＬＥＣＴＲＯＬＹＴＥＺｈｕＤｉＮａｎｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓａｎｄＡｓｔｒｏｎａｕｔｉｃｓＡｂｓｔｒａｃｔＢａｓｅｄｏ...     

STUDY OF THE 3-DIMENSIONAL STRESSES OF COLD STRIP ROLLING UNDER CENTRE WAVE

ＳＴＵＤＹＯＦＴＨＥ３－ＤＩＭＥＮＳＩＯＮＡＬＳＴＲＥＳＳＥＳＯＦＣＯＬＤＳＴＲＩＰＲＯＬＬＩＮＧＵＮＤＥＲＣＥＮＴＲＥＷＡＶＥ￥ＬｉｕＨｏｎｇｍｉｎ；ＢｉａｎＹｕｈｏｎｇ；ＬｉａｎＪｉａｃｈｕａｎｇ（ＹａｎｓｈａｎＵｎｉｖｅｒｓｉｔｙ）Ａｂｓｔｒａ...     

UBM STUDY ON DOUBLE-DIE IRONING PROCESS

ＵＢＭＳＴＵＤＹＯＮＤＯＵＢＬＥ－ＤＩＥＩＲＯＮＩＮＧＰＲＯＣＥＳＳＵＢＭＳＴＵＤＹＯＮＤＯＵＢＬＥ－ＤＩＥＩＲＯＮＩＮＧＰＲＯＣＥＳＳＷａｎｇＬｉａｎｓｈｅｎｇ；ＤｏｎｇＬｉａｎｇ；ＤｏｎｇＳｈｉｓｈｅｎｇＴａｉｙｕａｎＨｅａｖｙＭａｃｈｉｎｅｒｙ...     

面向CIMS的多数据源互操作与开放分布处理系统：CIMS_MIODP的设 …

多数据源互损伤与开放分布处理系统ＣＩＭＳ＿ＭＩＯＤＰ是采用分布对象互操作与代理技术,实现面向ＣＩＭＳ的基于ＲＰＣ的远程对象访问ＲＯＡ（Ｒｅｍｏｔｅ Ｏｂｊｅｃｔ Ａｃｃｅｓｓ）功能和基于ＳＱＬ３远程数据库访问ＲＤＡ（Ｒｅｍｏｔ Ｄａｔａｂａｓｅ Ａｃｃｅｓｓ）功能的系统,为ＣＩＭＳ环境下的信息集成与分布处理提供了不同层次的支持功能。本文讨论了ＣＩＭＳ＿ＭＩＯＤＰ系统的主要设计和实现问题,包括基本模     

小波变换在摆式列车倾摆控制系统故障诊断中的应用研究

小波变换在故障诊断中得到较广泛的应用，但采用不同的小波，分析结果往往会有很大差异。对常用的正交、半正交、双正交小波提取信号特征的能力进行分析比较，表明半正交B样条小波因具有线性相位和采用较长的分解系列，而具有较好的局部化特性和较小的变换误差，是摆式列车倾摆控制系统故障诊断中的较佳小波基。提出一种新的确定故障诊断阈值的方法，并通过实验证明了方法的有效性，为小波变换在摆式列车实车倾摆控制系统故障诊断中的应用提供理论依据。     

大型铝合金活塞倾转铸造机轻量化设计与研制

介绍了一种大型铝合金活塞倾转铸造机的设计,与传统设计方法相比,倾转工作台的尺寸可减小54％,重量可降低43％,实现了直径在200 mm以上大型铝合金活塞铸造机的轻量化设计,达到节能降耗的目的。     

适用于管道内形貌检测的3D全景视觉传感器

管道内部缺陷种类繁多、检测困难且自动化程度低,针对这些问题,提出了一种适用于管道形貌检测的3D全景视觉检测方法。首先设计了一种获取管道内部全景颜色纹理信息的全景视觉传感器(ODVS),然后设计了一种能快速并高精度获得管道内壁深度信息的主动式全景视觉传感器(ASODVS),接着将这两种ODVS进行紧凑小型化设计,通过软件将全景3D测量数据与全景颜色纹理数据的快速融合,在对管道内功能性缺陷和结构性缺陷进行全方位自动分析和评估的同时实现管道内部三维建模。实验结果表明,所设计的ASODVS+ODVS能实时获取地下管道内部颜色纹理和几何信息的全景图像,配置在管道机器人上能在狭长管道内边行走、边检测、边识别和边重构。     

Development of a tilting system for electric multiple unit to speed up on conventional lines

An advanced tilting system for KTT (Korean Tilting Train) was developed and a performance test of the system has been completed. KTT has been constructed to speed up and promise a significant enhancement in service quality on a conventional line. KTT is an electric multiple unit composed of 6 cars running at the design speed of 200 km/h. The tilting system is the core technology of KTT and combined with the conventional bogie system. It has a self-steering mechanism and a swing link. The self-steering mechanism of Z-bar type is free to rotate on the curve and stable to run on a straight line. The swing link mechanism of the bolster enables the carbody to tilt up to 8°. A tilting control system detects a curve with sensors and commands the electro-mechanical actuators to move the bolster through the computer network system. GPS collaborates with the tilting system to perceive the curve previously and enables gradual tilting so as not to violate passenger comfort. The performance of the tilting system has been verified by a trial test running of KTT on a commercial conventional line. The tilting system is ready for commercial use. This paper was recommended for publication in revised form by Associate Editor Hong Hee Yoo SUNG IL SEO, Dr. Seo was born at Seoul, Korea in 1962. He graduated from Department of Naval Architecture, Seoul National University in 1984 and received a doctor degree from the same university in 1994. He entered Hanjin Heavy Industries Co. in 1986 and was engaged in structural design of ship and development of aluminum rolling stocks. He transferred to KRRI in 2002. He was engaged in development of Korea High Speed Train. He has been in charge of the development project for Korea Tilting Train. He published many research papers on high speed train, structural design and welding deformations in international journals.     

Influence of pad–pivot friction on tilting pad journal bearing

Some experimental studies reported that the performance of tilting pad journal bearing is related with the pad–pivot friction. Only a few researches, however, consider the friction as a factor even though many ones have theoretically analyzed the performance of bearing. Also, there is no mathematical model for the friction to explain the effect of friction on the performance of bearing. Therefore, this study proposes a mathematical model for the pad–pivot friction and analyzes the effect of friction on the tilting pad journal bearing.The results of this analysis show that the friction has a large influence on the attitude angle of the journal. It is found that the eccentricity direction of the journal does not coincide with the load direction when the friction is not zero. According to working conditions, the attitude angle can be up to 25° when friction coefficient is equal to 0.5. It is also found that the tilt angle of the pad is not determined as a fixed value in case of the bearing with non-zero friction, even though working conditions is given for the static analysis. This study represents four different tilt angles under same working conditions.     

The Behavior of the Centrally Pivoted Thrust Bearing Pad with Hydrostatic Recesses Pressurized by a Constant-Rate Flow

The tilting behavior of the centrally pivoted, externally pressurized tilting thrust pad is investigated. The pressure distribution in the oil film is obtained by solving the Reynolds' equation which takes into account the external pressurization induced by a constant-rate flow. The relation between the size of the hydrostatic recess and the tilt angle of the pad is described. Calculations show that a pad with pressure recesses may have a negative tilt angle, depending on the size of the recess. The pressure variation around the hydrostatic pressure recess causes the moment to force the pad to tilt backward. At high shaft rotational speeds, the pad tilts backward too much and eventually fails to support the load. The hydrostatic pressure recess that is utilized to avoid the metal contact may cause this. The result was confirmed by experiments.     

STUDY ON DYNAMIC CURVING BEHAVIOR OF TILTING PASSENGER CARS

By using tilting carbodies, train can negotiate at a higher speed without reducing the passenger's ride quality.This is a good method to allow a significant increase in speed at existing track to improve the railway transportation capability, and to enhance the competition ability of railways with other transportation systems. With the increase of the curvenegotiation speed, the wheel-rail lateral forces and wheel-rail wear of the tilting train will increase. The self-steering radialbogie is an effective way to solve the problem. The dynamic model of the tilting passenger car with self-steering bogies isestablished in detail, and the curving performance of the car is investigated.     

高速齿轮传动可倾瓦轴承预负荷系数影响研究

可倾瓦轴承因其稳定可靠的特点被广泛应用于现代工业,相关研究也蓬勃发展起来,但目前关于可倾瓦轴承预负荷系数的研究主要集中在低转速领域。以DyRoBeS软件为研究工具,取普遍使用的5块瓦可倾瓦轴承作为研究对象,分析在20 000 r/min、40 000 r/min、60 000 r/min的高转速工况下,预负荷系数对可倾瓦轴承工作性能的影响,为高速齿轮传动中可倾瓦的设计应用提供理论依据。预负荷系数从0.1增加至0.7的过程中,对功率损失影响不大,使最大油膜压力与刚度系数增加,最小油膜厚度与阻尼系数减小。预负荷系数的混合设置会影响各瓦块压力分布,同时使最小油膜厚度以外的轴承性能参数明显增加。所得结论对高转速可倾瓦轴承的优化设计起到积极的作用。     

重型汽车驾驶室电动/手动翻转装置油泵电机的设计

针对重型汽车驾驶室翻转装置要求翻转力较大的现实情况,设计出了钕铁硼永磁直流电机驱动的电动/手动液压翻转装置,并对油泵电机的功率、永磁体和电枢绕组进行了参数化设计,设计的钕铁硼永磁直流电机结构简单、比功率大,可有效提高重型车驾驶室翻转机构的安全性和可靠性.     

建立可倾瓦轴承动态雷诺方程的一种新方法

首先给出了可倾瓦轴承油膜厚度的计算公式,根据基本雷诺方程,采用一种新方法建立了层流状态下可倾瓦的动态雷诺方程,并结合水轮发电机组,给出了相应的动态边界条件。