数字图像中傅里叶变换的研究分析与仿真

为探索新的数字图像处理方法,研究了数字图像的频谱,特别研究了幅值谱对图像的影响。从高频和低频两个角度,分别研究了频谱。以一幅图像为例,通过Mat Lab进行仿真和分析。尤其是对幅值谱的理论研究,为实现新的数字图像处理方法奠定了基础。     

某军用勤务保障车平顺性建模与仿真分析

以某军用勤务保障车为研究对象,以多体系统动力学为研究方法,以国家标准为实验依据,对整车进行了脉冲路面下的试验,利用ADAMS软件进行了整车建模仿真,为整车的优化设计提供了理论依据.     

单侧自卸式矿车研究

为提高矿车在矿山运输中的效率,以三维软件Solid Edge为平台,以某企业2m^3单侧自卸式矿车为研究对象,运用先进的设计理论和方法对整个矿车系统进行了研究。在研究过程中采用虚拟样机技术,大大降低了研究成本,缩短了研究时间,找到了现有矿车卸载时的不足。在分析的基础上得到了较为合理的曲轨卸载曲线,同时对矿车卸载过程进行了稳定性校核,从而完成对2m^3单侧自卸式矿车的虚拟开发。     

龙门吊结构有限元分析

以龙门吊为研究对象,以有限元分析法为研究方法,利用计算机分析软件对龙门吊的结构强度和刚度进行分析。主要对龙门吊系统多种工况进行了研究,详细分析了几种最具代表性的施工工况,为设计经济、可靠、稳定和高性能的龙门吊提供了有力的依据。     

供需网子网内部智能风险预测模型研究

为促进多功能开放型企业供需子网的有效运作,以供需网子网的内部风险为研究对象,开展了基于智能体的智能风险预测研究.首先从信息识别、信息分类及预测决策设计人手,对供需网子网的内部风险预测思想进行了探讨;然后,以智能体为手段,对风险智能预测模型进行了研究.研究了该智能体的结构模型,及智能体计算风险预警值的数学模型,并进一步从实践的角度,研究了该智能体的定义形式和其部分实现代码,进而实现了该智能体模型的系统化研究.     

人工微生物中的一种“感知—行为”模型

利用人工生命研究微生物种群特征和规律是人工智能发展的崭新领域。以人工智能的方法研究人工微生物的复杂系统,并从人工微生物个体的角度出发,研究并设计了一种“感知一行为”模型,该模型为“个体一群体”的复杂系统演变研究提供了一种新的思路和方法,为人工微生物种群的深入研究奠定了理论基础。     

航空活塞发动机曲轴配重修理研究

以进口某型航空活塞发动机曲轴配重为对象,对其曲轴配重修理进行研究.采用反求方法,获取了所需的技术参数,为修理研究奠定了基础.根据曲轴配重修理的特点,制定了修理工艺流程,并对修理研究中的技术难点进行了剖析.配重的实际使用情况证明,该修理研究获得了成功,取得了显著的效益.     

生命周期评价方法研究的最新进展及其分析

分析了生命周期评价方法在影响评价环节、研究对象、数据分配环节和数据收集环节的研究最新进展。同时,论文也分析了未来在产品生命周期评价研究方向上可能的最新研究方向。分析这些最新的研究成果和预测未来研究方向,将为国内生命周期评价研究者及时跟进国外领先的研究方向,并结合中国国情来确定生命周期评价研究的突破口提供依据,为有力地提高国内生命周期评价研究水平做出贡献。     

自顶向下的协同装配设计过程研究

本文阐述了自顶向下协同装配设计的含义,简述了以"齿轮减速器"为例的,自顶向下协同装配的设计过程,并将其与传统设计进行了比较研究,采集了研究的数据,总结了研究的结果,提出了研究需要深入的方向。     

基于指数分布的数控机床可靠性评估优化方案

研究了基于指数分布的数控机床可靠性评估试验方案。首先确定评估试验方案类型为有替换定时截尾试验,然后研究了为达到一定的置信区间所需要的最小失效数,并研究了试验机床数量与截尾时间乘积应满足的条件,以便获得最小失效数。最后,对最小截尾试验时间进行研究,给出了试验机床数量与截尾时间的优化方案。     

制造系统可靠性分析的框架与动力学机制

制造系统可靠性的研究已有几十年的历史,但相关研究所界定的研究范畴模糊,缺乏统一的分析框架,容易与传统的设备系统可靠性研究发生混淆。在文献研究的基础上,对制造系统的定义和内涵进行分析,并据此重新阐释制造系统性能与可靠性概念之间的区别和联系。从设备-工艺孪生的角度重新定义制造系统的概念,并指出在制造系统可靠性研究中忽视系统中人的作用的制造系统描述是不完备的。基于功能视角,重新定义了制造系统失效模式,建立制造系统可靠性分析的框架,阐述制造系统可靠性随时间变化机制的研究方法。研究指出大数据方法将是未来制造系统可靠性研究的重要方法之一。     

论路面不平度的研究背景和进展

提出了研究路面不平度的意义及其必要性。从整车平顺性的角度分析了该领域的研究背景;分别从道路工程和车辆工程两个领域归纳总结了国内外的研究阶段和发展现状。最后指出虽然汽车业近些年来迅猛发展,但在路面辨识方面的系统研究还很匮乏,急需开展相关工作,为车辆的研发和设计奠定坚实的基础。     

A literature review, classification and simple meta-analysis on scheduling of batch processors in semiconductor

In this paper, we present a literature review, classification schemes and a simple meta-analysis for scheduling of batch processors (SBP) research in semiconductor manufacturing (SM). This review is based on a study of journals and web-based documents/articles, which include conference materials, lecture notes in computer science, working papers, etc. There are 98 articles published in various publication outlets between 1986 and October 2004. Based on the literature review carried out and the nature of SBP research observed in SM, we have introduced two classification schemes to systematically organize the published articles. The first classification scheme is based on the problem configurations of SBP research in SM and the second one is based on the solution methodology followed by the researchers. These classification schemes indicate that there is much research scope on SBP research in SM. Furthermore, a simple meta-analysis is carried out to enhance understanding on the development and evolution of SBP research in SM and to identify potential research areas for further research and for improvement. The results show that there is an increasing trend in SBP research in SM. A comprehensive list of references is presented. This study is expected to provide a source of reference for other researchers (or readers), who are interested in SBP research particularly in SM and help stimulate further interest.     

大型储罐地震动力响应研究综述

立式圆柱形储罐是石油化工行业的一种重要存储设备,考虑各方面的原因,储罐的大型化发展已经是必然趋势。大型储罐一旦在地震中遭破坏,必将产生严重后果,故其抗震研究越来越受到工程界关注。综述了最近几年国内对大型储罐地震动力响应研究的概况,包括该领域的研究方法和主要的研究结论等。鉴于问题的复杂性,还指出了该领域尚亟待解决的问题,这对大型储罐的安全性保障将有促进作用。     

对“研究型教师”研究的反思

“研究型教师”是目前我国教育界讨论的热点问题之一，其研究内容主要涉及到什么是研究型教师、研究型教师的素质结构和怎样培养研究型教师等。研究存在的问题是，对研究型教师的要求过于理想化；研究型教师的角色定位不准；研究型教师的研究内容不明；培养策略过于泛化，未能体现出教师专业成长规律等。     

旋压成形技术数值模拟方法的应用现状与发展趋势

总结了数值模拟技术在旋压技术中的应用,从研究对象所涉及的领域、品种、材料、几何形体、应力场、工艺及研究工具等角度概括数值模拟技术的进展状况,回顾各研究所取得的成果,并就数值模拟分析及工艺设计智能化进行阐述,对今后的研究和发展趋势进行展望.     

Review of top of rail friction modifier tribology

The aim of this paper was to review the current state of research for top of rail friction modifiers (TORFM). In the railway industry, friction modifiers is a catch all term for a wide range of products applied for different purposes which has led to confusion. It is hoped that recently published definitions will aid industry to a better understanding of the different products and how they function. The benefits of friction modifiers are well understood with a large body of research supporting the benefits. Comparatively, there is a lot less knowledge of the optimum amount of product to achieve the benefits or how far down the track from an application site the benefit will be seen. Modelling of the products is another area where there is little research, with most of the modelling papers found focussing on dry wheel–rail contact due to the complexity of introducing a third-body layer to a friction force model. Furthermore, only one paper was found which relates how friction modifiers are affected by contaminants or other applied products such as lubricants. With many different products applied to wheels and rail for different purposes, understanding their interaction is key. At the time of this review, there are currently no standards that prescribe how TORFM should behave although the European Committee for Standardisation is currently developing them at the moment. This review has also attempted to appraise the research against a set of criteria. Depending on how many of the criteria the piece of research filled, it was categorised as A, B or C. It was found that most of the research was of category, this was mainly due to only one test method being used or the scale presented. Category A research incorporated modelling or multiple test-scales to support the results presented.     

路径查找空间关系推理研究综述

路径查找历来是空间关系推理的一个热点，是一个计算机科学、地理信息科学、人工智能等众多学科相交又的研究领域。对路径查找空闰关系推理的研究现状进行了概述，并根据研究现状，对今后路径查找空间关系推理的发展趋势和新的研究方向进行了论述。     

无人机液压弹射器弹射过程的仿真分析与试验研究

以液压蓄能器为动力源、液压马达为执行元件的无人机液压弹射器的弹射过程为研究对象,运用功率键合图法建立了弹射过程的数学模型,利用仿真分析结合实验对该过程进行了详细的研究,得到了弹射过程中关键工作参数对弹射性能的影响,为弹射系统的研发与改进提供了重要依据。     

The main achievements in the past 24 years and the prospects of mechanism research in China

Since 1982, the symposiums on mechanism in China has been held fifteen times. In the past 24 years, Chinese mechanism has experienced a phenomenal development. Generally, fundamental research on traditional mechanisms is enhanced; mechanism and creative design of products are closely combined; modern mechanism with advanced and new technology is opened up; and mechanism is promoted to modernization. These are manifested in the following aspects: theory research on analysis and synthesis of traditional mechanism is deeply developed; computer-aided design on mechanisms is realized vigorously; conceptual design of mechanism system and mechanical products is energetically pushed; research on robot mechanisms and its industrial application is deeply developed; research on analysis and synthesis of controllable mechanisms and compliant mechanisms are energetically carried out; research on the dynamics of mechanisms and machines is vigorously developed; and reformation of teaching contents and system of mechanism is energetically carried out. Through the above-mentioned aspects of theory research and practical application, the theoretical and academic levels of Chinese mechanism can be considered at the advanced international level. However, there are not many original and breakthrough research achievements of fundamental research in China. In the meantime, there is a larger gap in the aspect of practical application of mechanism in the country compared with advanced countries in the world.