共查询到20条相似文献,搜索用时 0 毫秒
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针对热连轧厂磨辊车间内的二次冷却装置初期不能满足使用要求、故障频繁、冷却不均匀等问题,对轧辊二次冷却方法进行改进。主要从改进集管布置、采用气动控制、增加管路过滤器和调压阀等方面对其进行完善,达到减少故障、方便操作和维修的目的,从而保证轧辊冷却均匀,提高轧制质量。 相似文献
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针对当前中等职业学校学生生源质量下降,厌学情绪严重,尤其是数控技术应用专业课相关课程的定义、概念、程序比较抽象、难以理解,导致学生学习效率普遍偏低、造成教学高耗低效的严峻现状,作者在广西机械高级技工学校学生中进行了数控技术应用专业课有效教学模式研究。主要运用现代教学理论,积极探索有效的教学模式,切实提高应用性学科教学质量,全面推进《数控技术》教学改革。 相似文献
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Experimental data of the continuous evolution of fluid flow characteristics in a dump combustor is very useful and essential for better and optimum designs of gas turbine combustors and ramjet engines. Unfortunately, experimental techniques such as 2D and/or 3D LDV (Laser Doppler Velocimetry) measurements provide only limited discrete information at given points; especially, for the cases of complex flows such as dump combustor swirling flows. For this type of flows, usual numerical interpolating schemes appear to be unsuitable. Recently, neural networks have emerged as viable means of expanding a finite data set of experimental measurements to enhance better understanding of a particular complex phenomenon. This study showed that generalized feed forward network is suitable for the prediction of turbulent swirling flow characteristics in a model dump combustor. These techniques are proposed for optimum designs of dump combustors and ramjet engines. 相似文献
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面向并行工程的产品设计生命系统模型探讨 总被引:5,自引:0,他引:5
本文探讨了并行工程和生命系统理论与产品设计的联系以及它们是如何提高设计效率的,在此基础上,本文提出产品设计过程模型。该模型从产品需求分析出发,结合生命系统理论,为设计人员有层次、并行地展开设计工作提供了一个概念框架。模型具有开放性,设计人员可以运用多种学科理论和技术进行工作,并多方位地采纳各部门的意见。本文还初步构造了一个用于产品设计建模工具软件的图形系统。 相似文献
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M. Hutchings 《Journal of microscopy》1983,130(3):331-338
Erosion of materials by the impact of small solid particles, by the impact of liquid drops and by cavitation in a liquid is discussed. Erosion arising from these three sources is described, terminology is defined, and the methods available for erosion testing in the laboratory are reviewed. A brief discussion is presented of the microscopical techniques which have been used to study erosion, and some of their advantages and drawbacks are outlined. 相似文献
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Friction model of a marine diesel engine piston assembly 总被引:2,自引:0,他引:2
In modern marine diesel engines, power output and in-cylinder firing pressures are constantly increasing, leading to higher friction in engine components and especially in the piston assembly. A good understanding of the friction contributions of the various engine components is needed, if mechanical efficiency is to be improved. A friction model for the engine piston assembly has been developed and is presented in this paper. The model, based on lubrication theory, considers the detailed engine geometry and the complete lubricant action, and thus can be applied to a wide range of engines. In detail, the analysis takes into account the friction components of compression rings, oil control rings, piston skirt and gudgeon pin of the engine piston assembly. The model was applied to a four-stroke (medium speed) marine diesel engine and the effect of engine speed and load on friction was examined and compared with results from other semi-empirical models. The engine friction was predicted at constant rotational speed (generator operation) and variable rotational speed (propulsion operation). 相似文献
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本文简单介绍了翻车机轨道衡检定规程编制原因及变化过程,分析了新旧两种规程下检定方法及允差的差别。提出了新规程带来的不利影响及解决方法。 相似文献
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Introduction to the innervation of bone 总被引:1,自引:0,他引:1
Goto T 《Microscopy research and technique》2002,58(2):59-60
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自动化监控组态软件是一个工程监控和数据采集系统。它为操作人员和开发人员提供方便、快捷的开发环境,用户可以实现各种控制、监视、调节和管理;其精确度高、稳定性强。开发后的系统可应用工业、农业控制和商业管理领域。如智能工控设备、温室生产、机盒、WebTV、网络冰箱、网络空调等。智能楼宇、交通、水处理等方面的应用也呈现出前所未有的生机。现使用组态王设计水、电、气三表智能抄表计费系统,该智能系统具有很强的开放性、经济性、可靠性、以及实用性,不仅用于生产,还适用于自动化专业教学,而且还可以推广到其它类似的控制系统。 相似文献
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本文用Visual Basic.NET二次开发AutoCAD,利用AutoCAD的三维造型与渲染功能,在VB.NE窗体上显示具有材质、光照等效果的照片级光线跟踪渲染机器运转三维动画,并以平压机为例,模拟机器轧制圆钢过程,隐藏了AutoCAD界面,就象直接用VB.NET编程完成的一样,为编程实现机械参数化三维渲染动画开辟了一条捷径。 相似文献