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李海芳 《中国科教创新导刊》2007,(19):76
数控铣是利用数字化控制,对零件进行切削加工的一种机器.它通过数控操作及编程来完成指令.为使学生能同时完成数控铣实习和考证的课程,数控铣实习应该把理论、MASTERCAM和机床操作整合一体化教学. 相似文献
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通过研究椭圆弧面螺纹的参数化编程与加工过程,介绍了利用SIEMENS系统提供的R参数指令编程功能编制出了具有通用性、适用性且应用简单的椭圆弧面螺纹的数控加工程序.使用时只需要在主程序中对相关变量进行赋值即可完成所需椭圆弧面螺纹的加工. 相似文献
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通过研究椭球面上螺纹的参数化编程与加工过程,利用FANUC 0i Mate-TC数控系统提供的宏程序编程功能,编制出了具有通用性、适用性的椭球面上螺纹的数控加工程序.该技术使用简单,只需在主程序中对相关变量进行赋值即可完成所需椭球面上螺纹的加工,能有效地保证椭球上加工螺纹的准确性,提高产品的尺寸精度和表面质量. 相似文献
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为探究我国编程教育的研究前沿,文章以CNKI数据库收录的期刊论文为研究对象,利用Cite Space绘制2016年以来104篇国内编程教育相关文献的知识图谱,展示我国编程教育研究现状,包括时间分布图谱、机构分布及合作图谱、关键词共现及聚类图谱等,揭示出我国编程教育研究、人工智能、少儿编程研究的发展演变路径,以期为开展编程教育的研究与应用提供借鉴. 相似文献
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建筑环境类课程涉及大量计算和一些数据处理技巧,需要利用合适的技术和手段来对相关计算进行建模.本文利用Excel VBA进行编程,对其在建筑环境虚拟仿真中的应用进行研究,并将其应用与课堂教学.从课堂反馈和教学效果来看,Excel VBA能够有效解决一些简单建筑环境虚拟仿真的问题,有效提高课堂教学质量. 相似文献
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以中医理论知识为基础,运用基于模糊节约覆盖集理论的推理方法对中医的疾病诊断问题进行了研究和开发,对中医诊断知识进行了形式化阐述,设计构造了诊断专家系统的整体框架,并编程实现.利用人机对话的补充诊断方式提高了诊断的准确度. 相似文献
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方伟 《赤峰学院学报(自然科学版)》2012,(7):21-22
通过对虚拟购物系统相关技术的开发和研究,指出利用VR ML技术实现虚拟现实场景的设计思路与流程,对虚拟现实技术开发的过程和步骤进行了深入的介绍,适当分析比较了VR ML技术中的建模技术、模型的深度优化操作,探讨了系统中对人机交互设计所涉及的关键技术（编程交互和非编程交互）的工作原理和设计方法,并对此进行了深层次的研究说明. 相似文献
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分形和类分形衍射及其在晶体生长中的应用 总被引：1，自引：0，他引：1
从研究分形和具有分形特性晶体的性质出发,基于电寻址液晶光阀系统和Matlab编程,研究了规则分形图样和采用DLA模型模拟的晶体类分形图样的光学衍射特性.分析了晶体生长不同阶段和存在外界影响时晶体形状的改变,并对不同条件引起的形状改变以及相关的衍射图样的改变进行了区别和总结.利用实验制得的实际铜样品,对理论推导与计算机模拟进行了验证.提出了一种通过观测晶体形状的衍射图样进行晶体生长控制的原理及方法,并对其优点以及相关深入研究点进行了具体分析,以期其能在科学研究乃至工业生产等活动中做出一定贡献. 相似文献
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利用LabVIEW虚拟仪器软件平台提供的IMAQ Vision视觉模块,开发了半固态合金初生相形貌定量分析系统.首先通过LabVIEW软件进行图像采集;然后利用IMAQ Vision提供的函数对图像进行处理,具体包括原始图像的单色处理、金相图像手动阀值设置、移除小颗粒和填充孔洞等;最后通过相关指标利用LabVIEW软件编程实现半固态初生相形貌参数的定量统计分析.根据测试结果,该系统能高效、准确地实现半固态合金初生相形貌定量分析功能. 相似文献
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随着自动编程技术的迅速发展,各种新型数控编程系统不断出现.利用图形编程理论,针对数控线切割机床的加工特点,开发了一种基于二维零件数控加工的TXBCH图形编程系统,重点研究了系统中图素的概念、图素的定义方式和算法,并在此基础上开发出了相应的软件.通过三十多个不同类型零件的图形输入,验证了本文所开发的TXBCH图形编程系统的正确性.解决了中小企业由于费用问题不能购买大型数控编程系统的难题,加快了中小企业的自动化进程. 相似文献
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Indoor air quality and thermal comfort are important features of indoor environment, In this paper, a numerical simulation based on the k-ε model of CFD is used to analyze factors such as loading, exterior-protected construction, blowing-in rate that play an important role in the temperature field and airflow field of the displacement ventilation system. Exterior-protected construction has little influence on indoor temperature distribution of displacement ventilation systems and the influence is limited only in a small area near the external wall when the indoor heat source is the main cooling load. The height of a room has little influence on indoor temperature field, and the temperature gradient of active region is basically unchanged. In the system combined with a displacement ventilation system and a cooling system, the height also has little influence. When the cooling load is high,the indoor heat source creates a strong convective plume, which will make the average indoor air age lower, the ventilation efficiency higher and the elimination of pollutant easier. Air supply rate plays an important role in displacement ventilation systems. The increase of air supply rate that can be realized by increasing the air supply velocity and enlarging the area of air inlet will increase the mass capability of the system and diminish the vertical temperature gradient. From the comparison between simulations and experiments, it is concluded that this simulation are creditable. 相似文献
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The explosion inside tunnel would generate blast wave which transmits through the longitudinal tunnel. Because of the close-in effects of the tunnel and the reflection by the confining tunnel structure, blast wave propagation inside tunnel is distinguished from that in air. When the explosion happens inside tunnel, the overpressure peak is higher than that of explosion happening in air. The continuance time of the blast wave also becomes longer. With the help of the numerical simulation finite element software LS-DYNA, a three-dimensional nonlinear dynamic simulation analysis for an explosion experiment inside tunnel was carried out. LS-DYNA is a fully integrated analysis program specifically designed for nonlinear dynamics and large strain problems. Compared with the experimental results, the simulation results have made the material parameters of numerical simulation model available. By using the model and the same material parameters, many results were adopted by calculating the model under different TNT explosion dynamites. Then the method of dimensional analysis was used for the simulation results. As overpressures of the explosion blast wave are the governing factor in the tunnel responses, a formula for the explosion blast wave over-pressure at a certain distance from the detonation center point inside the tunnel was derived by using the dimensional analysis theory. By comparing the results computed by the formula with experimental results which were obtained before, the formula was proved to be very applicable at some instance. The research may be helpful to estimate rapidly the effect of internal explosion of tunnel on the structure. 相似文献
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中国某传统民居天井对夏季室内环境的影响(英文) 总被引：2，自引：0，他引：2
针对传统民居中天井对夏季室内环境的影响,在2007年夏季对湖南张谷英村的传统民居建筑群进行了连续监测.监测项目包括室内外气温、室内外照度以及室内外风速,检测时间从8月5日至10日.结果显示:天井气温低于室外气温高于室内气温,表明天井作为"气候缓冲空间"能降低外界对室内热环境的影响;天井照度低于室外高于室内,表明天井能改善室内光环境.但是室内照度低于国家标准,说明改善效果极其有限,也表明遮阳设计依然是当地气候条件下的首要考虑因素;天井风速稳定且与堂屋风速接近,说明天井能促进夏季由水平风压引起的自然通风,但其烟囱效应并不明显. 相似文献
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YAN Jian-hua PENG Zheng LU Sheng-yong LI Xiao-dong CEN Ke-fa 《浙江大学学报(A卷英文版)》2006,7(11):1896-1903
INTRODUCTION Polychlorinated dibenzodioxins and poly- chlorinated dibenzofurans (PCDDs/Fs) are some major toxic substances unintentionally produced mainly from municipal solid waste incineration (MSWI). Attention has been focused on the best way for controlling and regulating such emissions. Among flue gas treatment technologies for post combustion zone emission control (Buekens and Huang, 1998; McKay, 2002), activated carbon adsorption (ACA) and techniques involving physical adsorp… 相似文献
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INTRODUCTIONWindenergyofabout2.531011Wavailableeverywhere,especiallyincoastalregions,deserts,grasslandsandcountrysideareasinChina,ispol-lutionfreeandrenewable(Xueetal.,2001).Useofwindenergycanimprovethelivingandworkingconditionsofpeople.Themanyelectricitygen-eratorsdrivenbywindpowerallovertheworldefficientlyextractwindenergyforconversionintoelectricalenergy.Manyregions,suchascountry-sideandruralareashavehighdensityofwindpower,buttheconditionsarenotgoodenoughforestablishingahighelectricpo… 相似文献
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邓超 《湖北成人教育学院学报》2014,(2):56-58
活塞缸式模型有其局限性,为了普遍地反映膜式空气弹簧的特性,应用Simulink建立了空气弹簧悬架单轮模型、压力模型、有效面积模型、有效容积模型、滤波白噪声模型。通过对膜式空气弹簧特性的仿真分析,探索了弹簧位移—弹力的非线性特性。在空气弹簧建模过程中确定了相关参数,对弹簧的几何特性和力学性能进行了详细的推导。通过随机路面输入信号波形与仿真结果的对比,验证了改进型活塞缸式模型的正确性,可以更真实地描述弹簧的变化特性。 相似文献
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根据高炉TRT工艺和影响高炉顶压稳定的因素,以及对高炉TRT系统的管路分析,建立高炉顶压TRT系统数学模型。应用Matlab对静叶单独调节高炉顶压时系统的数学模型进行仿真验证,为进一步改善高炉顶压的稳定提供理论依据。 相似文献
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Wind energy is a pollution free and renewable resource widely distributed over China. Aimed at protecting the environment and enlarging application of wind energy, a new approach to application of wind energy by using compressed air power to some extent instead of electricity put forward. This includes: explaining the working principles and characteristics of the wind energy-compressed air power system; discussing the compatibility of wind energy and compressor capacity; presenting the theoretical model and computational simulation of the system. The obtained compressor capacity vs wind power relationship in certain wind velocity range can be helpful in the designing of the wind power-compressed air system. Results of investigations on the application of high-pressure compressed air for pressure reduction led to conclusion that pressure reduction with expander is better than the throttle regulator in energy saving. 相似文献
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An onsite testing based on eight-site air sampling was carried out in an airlaid papermak-ing workshop in Tianjin, China. By theoretical calculation, super absorbent polymer (SAP) size and its existent state in indoor static airflow were obtained. SAP content in the sampled air was tested through chemical analysis method and found to be 3.0-7.2 times that of the human health limit in production areas. The concentrations of total suspending particles (TSP) and respirable particles were achieved by weighing. Particles of the most concern differ for varied function areas. Particles smaller than 10μm are mostly produced in the main production process, and 73%-90% particles generated in packing areas are larger than 10μm. SAP raw material particles can easily changed to suspending form by inevitable extrusion and frication. Correlation between respirable particles and TSP agrees well with that in atmospheric environment. 相似文献