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钢筋混凝土高层建筑结构计算机辅助设计程序ASD的研制 总被引:2,自引:0,他引:2
本文简要介绍了CAD技术的现状和AutocAD的程序开发特性,用VisualC/C++在AutoCADR13环境下进行软件开发,并简要介绍了正在研制的钢筋混凝土高层建筑结构计算机辅助设计程序ASD的组成,功能和主要的实现方法。 相似文献
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加入敏化离子C_r~(3+)的RE:YAG晶体中能量转移 总被引:1,自引:0,他引:1
测量了Cr3+和RE3+(Tm3+,Ho3+,Nd3+)共掺的YAG晶体的吸收谱、荧光谱和Cr3+的荧光衰减曲线.计算了Cr3+向RE3+能量转移的效率和速率.它是依Ho3+、Nd3+,Tm3+递增的,提出比较能量转移效率大小的简便方法. 相似文献
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本文阐述了北京第一机床厂在CIMS环境下,通过对零件特征的分析,提出了一种实用的描述产品零件的方法,在此基础上实现了回转体零件的CAD/CAPP/CAM集成系统的开发。重点论述了该系统的总体框架设计和主要功能:CAD特征定义及描述;基于商品CAD软件ICEMDDN之上的特征造型;应用通用专家智能系统开发工具,建立工艺知识模型及推理系统;经相应的后置处理实现NC程序的自动生成及以ORACLE。EDL 相似文献
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研究了在智能CAD系统SIGRAPH-DSIGN环境下进行机构装配设计的途径,给出了要领设计,装配设计和零件设计的一般方法,并以胶印机中凸轮一连杆机构为例,采用自顶向下的装配设计方法, 相似文献
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为了适应现代工业的发展,缩短产品包装的周期,提高纸盒的精度和产品在市场的竞争力,满足自动化包装以及商品出口对纸盒的要求,德国、美国等先进工业国在70年代初期就成功地研制了纸盒计算机辅助设计/制造(CAD/CAM)系统,包装印刷企业在80年代末就普遍采用了纸盒CAD/CAM新工艺。今年5月份在德国杜塞尔多夫举办的“Drupa2000国际印刷及媒体”展览会上,德国的MARBACH公司、LASERCOMB公司以及GERBER集团公司等展示了最新开发研制的纸盒CAD/CAM系统。最近几年,我国一些企业如… 相似文献
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饶锡新 《成组技术与生产现代化》1995,(3):67-70
本文从分析现有微机参数化机械设计CAD系统入手,指出了该类系统在进行的所谓参数化设计中所存在的问题和不足;同时推出了一项的参数化CAD系统的设计技术-基于Windows应用间动态数据交换DDE技术的参数化机械设计CAD系统开发软件技术,文中阐述了基于DDE技术的参数化CAD系统开发的一般方法和应用环境。 相似文献
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本文简要论述了AutoCADR14基于面向对象技术和程序开发特性,并简要介绍了正在研制的膜结构CAD系统前后处理部分的组成、功能和主要实现方法。 相似文献
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利用MEVVA源引出Mo离子和C离子,对65Nb钢进行不同剂量的离子注入,通过硬度测量、XRD、AES等方法研究了注入前后65Nb钢改性层的性能、成分及相组成的变化。试验发现Mo+C双元离子注入,可在65Nb钢注入层形成弥散的Fe2MoC相,这是使该种基体钢经离子注入后表面硬度显著提高的重要原因。 相似文献
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目的通过对地域性饮食习惯(文化)因素、用户习惯等引起的冰箱冷藏区食材串味的问题进行系统分析,探索解决冰箱内部食材串味问题的设计路径以及方法,提升冰箱的用户体验。方法对地域饮食文化进行系统分析,着重梳理与冰箱冷藏食材串味有关的地域饮食习惯、食材存放方式以及目前的冰箱设计现状三个部分内容,结合用户调研、模型建立、对比研究等方法,全面剖析冰箱串味的根源性因素,建立设计模型。结论冰箱冷藏室食材串味问题与用户行为、地域饮食习惯(文化)密切相关,按照特定饮食结构重新规划分区,针对性地储藏特殊食材,引导和规范用户的使用方式,以产品功能组合设计的方法来解决食材串味问题。 相似文献
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A cryogenic refrigeration system is one of the indispensable components for cooling superconducting motor or generator. Among various configurations of cryogenic refrigeration system, the on-board refrigeration system is considered to be attractive for compactness and small heat leak. In order to turn this concept into reality, we focus on two essential points; development of the specific structure for on-board refrigeration and optimal design of the refrigerator. Since the on-board refrigeration system should not create unbalanced vibration, the inline Stirling-type pulse tube refrigerator is considered as a good candidate and more concrete and efficient structure is developed under the design constraints. The dynamic absorber is used to maintain the dynamic stability of the single acting linear compressor. To increase thermal Carnot efficiency with the on-board Stirling-type pulse tube refrigerator, slit-type heat exchangers are implemented and flow straighteners are carefully designed by the three-dimensional CFD simulation. The overall configuration of the Stirling-type pulse tube refrigerator is designed and fabricated by the optimal process. The present on-board refrigerator has the cooling capacity of 7 W at 59.5 K with the Carnot efficiency of 10.9%. According to these experimental results, the pulse tube refrigerator as the on-board refrigeration system possesses a sufficient thermal efficiency despite the restricted design configuration. The on-board refrigeration is considered as a useful method for cooling HTS superconducting motor. 相似文献
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描述了用于KM6载人航天器空间环境模拟器氦制冷机的系统设计。介绍了制冷循环和纯化方法的选择、系统参数的确定、制冷循环流程图和系统的主要特点。制冷机采用并联的气体润滑透平膨胀机,其设计制冷量为600W(20K)。采用了液氮预冷的布雷顿循环和低温吸附内纯化器。 相似文献
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通过小型制冷装置蒸发器的计算机辅助设计,介绍了一种机电产品新颖的现代设计方法。实践证明:计算机辅助设计为机电产品的技术设计和造型设计同时并举,互相渗透,互相制约,提供了良好的环境和条件,并大大加快了设计过程,优化了设计质量;当前,最迫切的问题是如何将CAD技术用于生产实践,因为实践应用才能真正推动这一技术的不断发展。 相似文献
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A.P. Severijns 《低温学》1980,20(3):115-121
A novel dilution refrigerator system is proposed, which offers the potentiality of very high circulation rates. The design of this refrigerator is described and the construction and performance of a prototype are discussed. He4 is circulated by means of a multi-stage thermomechanical or fountain pump, which can build up high fountain pressures. 相似文献
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通过对电冰箱制冷系统和压缩机的匹配进行优化,最终把电冰箱能耗由原来的0.29 kW.h/24 h降低到0.25 kW.h/24 h。总结此次项目的成功经验为后续节能电冰箱的设计提供参考依据。 相似文献
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When newly designed refrigerator parts failed due to repetitive loads under consumer usage conditions in the field, a general method for reliability design was proposed. A newly designed refrigerator compressor system that brings greater energy efficiency to side-by-side (SBS) refrigerators was studied. The laboratory failure mode and mechanism of the compressor was a stopping nose due to design flaws. The data on the failed products in the field, accelerated life tests (ALT) and corrective action plans were used to identify the key control parameters for the mechanical compressor system. The missing controllable design parameters of the compressor system in the design phase were the gap between the frame and the upper due to the stator frame shape. After a tailored series of accelerated life tests with corrective action plans, the B1 life of the new compressor system is now guaranteed to be over 10 years with a yearly failure rate of 0.1%. 相似文献
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Tang Y.B. Chen Y.G. Teng B.H. Fu H. Li H.X. Tu M.J. 《IEEE transactions on magnetics》2004,40(3):1597-1600
We calculate the magnetic field distribution of a permanent magnetic circuit with an air gap in a magnetic refrigerator by a finite-element method, and compare the field strengths of different structural parameters of the magnetic circuit. We show how the structure of the magnetic circuit can be optimized and present some approaches to improve the structure for a specific magnetic circuit. The main purpose is to provide basic parameters for the design of a practical magnetic refrigerator. 相似文献