基于MasterCAM的塑料零件的模具设计

介绍了利用MasterCAM软件对塑料模具设计的方法.通过具体实例,阐述了如何利用MasterCAM软件的参数化实体建模技术实现模具型腔、型芯的设计.研究结果表明MasterCAM软件对塑料模具的设计具有一定的参考价值.     

基于DSP的永磁同步电机的控制系统的设计

介绍一种采用DSP芯片TMS320LF2407A实现永磁同步电机矢量控制器的控制原理,给出了采用矢量控制策略来设计该控制器的硬件组成结构及软件设计流程.     

成熟的市场该是什么样的

这2天在衡阳走,最切身的感受是,这座城市较发达城市来看还有诸多的不成熟,一如它的空调市场,还有很长的路要走。你听说过高铁站正规的出租车通道,打车是需要议价的吗？而且说不定不给小票。没错,以小见大,这是衡阳许多现象的一个具化反应。早在中部地区还不像现在被重视时,我们对湖南的了解可能除了芒果台就所知甚少了,更别说衡阳。其实,衡阳作为整个湖南GDP第三大的市场（和第二名差距很小）,在未来所拥有的潜力是巨大的,只是挖掘潜力需要的是时间和耐心，当然还得有科学合理的手段。     

基于CATIA的渐开线圆柱齿轮的零件库的建立

运用CATIA三维CAD软件建立了渐开线圆柱齿轮的参数化模型,并建立了渐开线圆柱齿轮的零件库,使渐开线圆柱齿轮建模一劳永逸。     

名表的时尚 时间的沙龙

今天《时尚时间》不想以历史讲座的角色出现在读者面前,虽然钟表历史源远流长。《时尚时间》的读者喜爱的是实用主义的知识,而不是枯燥的倒背如流的书面语言。3月18日钟表·《时尚时间》与积家表共同举办了一次神秘的表展。     

基于Matlab的齿轮泵的优化设计

将最优化数学理论与具有强大数值计算功能的软件MatlaB相结合,运动到齿轮泵的优化设计过程中。优化过程以齿轮泵体积最小为目标函数,提出相应约束条件,并对优化的结果进行Fluent软件的验证,得到优化后的齿轮泵的体积与优化前的空间体积减少了22.92%,优化效果明显。     

基于计算机的测谎仪的研制

本文介绍了一种基于计算机的测谎仪。本文详细介绍了该测谎仪所用的呼吸、脉搏、皮电传感器以及数据来集系统，并讲述了测谎试验方法以及结果分析。     

基于SOA的敏捷策略的系统架构的研究

随着企业信息化和市场的发展,企业应对环境的变化能力成为头等大事。通过研究SOA的现状,发现SOA在认识和实施中存在的问题,结合敏捷策略的机动性的优点,构建了基于SOA的敏捷策略的系统框架。利用先进的Web Services作为技术基础,充分发挥团队的能力,将敏捷、信息流和模块的优点结合在一起,解决企业实施中的问题,适应了市场的变化。结合生产实际,证实了二者结合的有效性和实用价值。     

完美的解决方案 完美的SKF

CIMT2011已经落下帷幕。此次展会给参会者带来了挥之不去的经典,领先的技术,成功的产品,先进的理念,让人印象深刻,而SKF就是其中完美主义的代表。拥有百年历史的SKF,在全球32个国家有130多个生产工厂,服务于全球是他们的理念。本次展会,他们带来的是超精密轴承、     

锂电池的综合测试系统的研究

随着锂电池的应用越来越多,对生产的锂电池产品质量提出了更高的要求。与此同时,对锂电池检测系统也提出了更高的要求。本文主要介绍了一种基于单片机控制的锂电池全面综合测试系统。对其工作原理进行了叙述。     

叶切面最大厚度数值计算与应用

以叶切面最大厚度的数值计算方法为基础,探讨叶切面最大厚度计算的计算机实现,介绍叶切面厚度数值计算法的应用实例.     

Natural frequencies of vibration of a class of solids composed of layers of isotropic materials

In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape.     

Development of sclerometric method of studying activation of parameters of damage and fracture of friction deformable surfaces

The article presents a brief review of the wear models based on the kinetic thermofluctuation approach. The materials were developed using SamGTU sclerometric programming software and a set of instruments developed at Samara Engineering University for assessing the parameters of kinetic thermoactivation for surface fracture deformed by friction. The first obtained results of assessments and the estimated prediction of wear resistance exemplified by tribocouple of the aircraft chassis are presented.     

Method of implementation of the positive gradient of mechanical properties of triboengineering materials

Modern methods of implementation of the rule of positive gradient of mechanical properties are considered; this rule was formulated by I.V. Kragelskii and its application serves to minimize the friction and wear of solids. The given methods include the application of coatings with the method of finishing antifricton abrasion-free treatment; application of new metal-cladding lubricating materials; and creation of a nanostructural state of the surface iron nitride layer by nitriding steel with a positive gradient of hardness normal to the surface.     

双丝杠驱动机构同步分析

介绍了双丝杠驱动机构工作原理,论述了双丝杠运动产生不同步的原因以及如何判定与解决同步问题。     

轮胎单个横沟泵吸噪声计算方法研究

以205/50R16子午线轮胎为对象,建立具有横向花纹沟槽的有限元法分析模型,利用Abaqus/Explicit进行瞬态滚动分析,得到滚动轮胎单个横沟的体积变化。将其导入Fluent中,利用计算流体力学方法对单个横沟泵吸效益流场进行分析,并结合Lighthill声学类比理论预测横向沟槽的噪声,同时基于涡声理论验证流场与噪声之间的关系。结果表明,单个横沟泵吸噪声第一峰值集中在0.8～2.0 kHz附近,仿真数据与试验结果在趋势上具有一致性;且噪声的声压峰值出现在泵吸状态发生转变的时间段;在时域中的3个噪声峰值出现涡量变化较大的时间段,已确定噪声的变化可由涡量来反映。     

膨胀套导向机构的设计

通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即：增加导向机构。     

Geometrical method of selection of features of diagnostic signals

The paper presents the method of selection of features of diagnostic signals relying on the geometry of observation space. The method presented here uses two criteria of ability to separate (isolate) classes of an object's state: the criterion of average scatters and the original criterion of number of prototypes of classes. The method can be successfully used for initial analysis of input data to a neural network dealing with recognition of patterns and classification of an object's state. It also possible to use the algorithm presented here for determining the prototypes of classes needed for creating the training set for the neural network.     

Theory of polyhedrons of positioning accuracy of manipulators

A method of determining polyhedrons of positioning accuracy of mechanical manipulators is developed. Practical significance of the method is illustrated by numerical examples. Polyhedrons of positioning accuracy for a manipulator of 6-R type are calculated for several positions.     

两种仪表功能合理性评述

本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当，影响了仪表的正常使用，制造厂和用户应关注这类问题。