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张琳 《工业仪表与自动化装置》2017,(1)
介绍了HR-906B GPS时间同步系统在化工企业自动控制系统中的时钟同步应用,和HR-906B GPS时间同步系统的组成及系统自身的搭建过程。另外介绍了主时钟系统在DCS系统、SIS系统的配置过程。该文所例举的DCS系统为横河CENTUM-VP系统,SIS为RTP的3000系统的一般配置方法。 相似文献
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本文分成四大部分,首先阐述了ERP系统与PDM系统的集成在企业信息化建设中的重要作用;接着对ERP系统和PDM系统功能之异同及两系统集成对克服ERP系统功能的局限性、提高企业信息化水平的作用进行分析,通过比较进一步地论证两系统集成的必要性;第三部分对ERP系统与PDM系统的集成技术进行了重点介绍;文章最后对ERP系统与PDM系统集成的可行性和必然性进行总结。 相似文献
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液压系统是液压绞车的重要组成部分。液压绞车的液压驱动系统可分为开式系统和闭式系统,开式系统具有结构简单、价格低廉、维修容易等优点。运用AMES im软件对开式液压系统性能进行分析,通过改变系统参数得到不同系统参数对系统性能的影响。 相似文献
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建立了随机载荷作用下的失效相关串联系统、并联系统和k/n系统动态可靠性模型,并研究了系统可靠度和失效率随时间的变化规律。在系统层运用载荷一强度干涉模型建立了失效相关系统可靠性模型;在分析系统可靠性模型的基础上,建立了系统强度的累积分布函数和概率密度函数。运用顺序统计量理论建立了载荷多次作用时等效载荷的累积分布函数和概率密度函数,进而建立了强度不退化时载荷多次作用下的系统可靠性模型以及系统动态可靠性模型。运用概率微分方程建立了强度退化时的系统动态可靠性模型。研究了串联系统、并联系统和k/n系统可靠度和失效率随时间变化的规律。研究表明:系统与零件具有相似的特征;系统的可靠度随时间逐渐降低,k/n系统的可靠度介于串联系统和并联系统之间;强度不退化时,系统的失效率随时间逐渐减小;强度退化时,系统的失效率具有“浴盆”曲线的全部特征。 相似文献
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机械式离心调速器系统混沌的非线性反馈反控制 总被引:2,自引:0,他引:2
根据拉格朗日方程建立了机械式离心调速器系统的动力学方程,求出了系统的平衡点,利用系统的相图分析了给定参数下自治系统及非自治系统的运动状态,用Poincaré映射图分析了非自治系统混沌的形成过程。利用非线性反馈反控制方法实现了自治系统及非自治系统混沌的反控制,将自治系统及非自治系统的周期运动利用适当的控制强度反控制到混沌运动轨道。 相似文献
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介绍数控车床工具系统的作用,圆柱柄及通用型车削工具系统的发展,国外更换刀具头部的车削工具系统:BTS工具系统、FTS工具系统、GAPTO工具系统。 相似文献
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探讨了设计型专家系统的特点,采用面向对象的设计方法,建立了集设计、分析、计算与图形处理于一体的机电产品设计专家系统,论述了该专家系统的结构、知识表示方法、推理机制及构建策略。该设计专家系统的建立,必将克服机电产品设计周期长、经济性能差的缺点.促进产品设计的自动化和智能化. 相似文献
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设计了远程诊断中心的原型和框架结构,综合利用数据库技术、专家系统、Java相关技术,开发了基于Internet的分布式远程故障诊断系统,把专家系统成功地应用到了工程性的实用产品中.实现了对现场设备的远程诊断和分析,所开发的系统具有良好的开放性和准确性. 相似文献
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基于神经网络块的混合型方案设计知识库系统 总被引:6,自引:2,他引:4
文中祥描述了神经网络块的功能结构,提出了基于神经网络的混合型专家系统结构框架,阐述了各个模块的基本功能,并成功地将其应用于复杂产品方案设计智能决策支持系统知识库的研制中。 相似文献
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D. H. Park S. S. Kang S. B. Park 《The International Journal of Advanced Manufacturing Technology》2002,20(1):31-38
In this paper a surface area calculation for non-axisymmetric deep drawing products of elliptical shape was constructed for
the design of blank shapes of deep drawing products by using an AutoLISP function in AutoCAD software. A computer-aided process
planning (CAPP) system for rotationally symmetric deep drawing products has been developed. In this study, a CAPP system for
non-axisymmetric deep drawing products of elliptical shape was constructed using process sequence design. The system developed
consists of four modules. The first is the recognition of shape module for recognising non-axisymmetric products. The second
is a 3D modelling module for calculating the surface area for non-axisymmetric products. The third is a blank design module
for creating an oval-shaped blank with an identical surface area. The fourth is a process planning module based on production
rules that play the most important role in an expert system for manufacturing. The production rules are generated and upgraded
by interviewing field engineers. The drawing coefficient, the punch and die radii for elliptical shape products are considered
as the main design parameters. The suitability of this system was verified by applying it to a real deep drawing product.
This surface area calculation and CAPP system should be very useful for reducing the lead-time for manufacturing and for improving
the accuracy of products. 相似文献
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以柔性模块化设计理论为基础,将KBE技术与CAE技术集于一体,提出了将KBE技术与CAE相结合的产品柔性模块的创建方法,介绍了以面向对象的专家系统集成开发环境(Visual Frame,VF)为基础完成知识库的构建方法,并以液压机为例,建立了一套基于KBE和CAE技术的液压机机身计算机辅助设计系统框架。实践证明,将KBE技术和CAE技术集于一体,能够较好的解决机械产品的模块化快速响应设计问题。 相似文献
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Mohammad Hosein Fazel Zarandi Saeid Mansour Seid Ali Hosseinijou Milad Avazbeigi 《The International Journal of Advanced Manufacturing Technology》2011,57(9-12):885-903
Material selection is one of the main phases of product design process that has great impact on the manufacturing of sustainable products. One of the best approaches of material selection for sustainable products is life cycle engineering (LCE). But LCE is a costly and cumbersome task and it is not economic to perform this task for a large number of proposed materials in order to choose the most suitable one for a sustainable product. Instead, it is more reasonable to make a preliminary filtering on the proposed materials and obtain a shorter list of candidate materials and then perform LCE on alternatives which are obtained from preliminary filtering. Since environmental friendliness of materials is a critical sustainability issue, so it is a good criterion for preliminary filtering of alternatives. In this paper, a new methodology is proposed to support preliminary filtering of alternatives from environmental viewpoint. The methodology uses the knowledge of experts in the field of eco-design. The knowledge is translated to decision making rules and a decision tree is developed to guide the choice. In order to use the capabilities of frame-based systems, an object-oriented approach for representation of knowledge is also proposed. Moreover, a prototype hybrid expert system based on the proposed methodology called material selection expert system for sustainable product design is developed to support the task of preliminary filtering. Finally, a case study from tire manufacturing industries is presented to show the validity of the proposed system. The results show that the system can determine the appropriate candidate materials and hence improve the possibility of manufacturing of more sustainable products. Eliminating alternatives that do not have the necessary conditions for sustainable product leads to a large saving in time and cost of the LCE evaluation process 相似文献
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阐述了一种注塑模数字化设计技术.运用Pro/E软件的通用功能模块和模架设计专家(EMX)模块,进行塑件及注塑模设计.以相机面壳注塑模设计为例,验证了该方法的可行性.该方法可以提高塑料注射模具的开发效率. 相似文献