加强制图课程实践教学的探讨

通过制图课程特点的分析,指出加强制图实践教学环节的必要性,分别在测绘、上机、认知、拆装分析和模型制作方面提出了建议,并分析了加强制图课程实践教学在培养学生工程素质方面的作用.     

“工程图学”双语教学模式研究与实践

根据"工程制图"双语教学的实践,分析了在国内现有环境下"工程制图"课程的双语教学模式的选择,结合"工程制图"实施双语教学中所面临的主要问题,针对如何更好地开展这门课程,从教学模式、教学方法、考核方式进行改革与实践的经验等诸方面进行了探析,提出了见解和建议。     

基于SolidWorks三维造型的工程制图实践教学改革

分析传统工程图学教学存在的主要问题,将Solidworks三维造型软件引入工程制图实践教学中,强调了引入计算机三维建模的必要性,从制图实验的教学体系、测绘实习、实践教学虚拟模型库建设对工程制图实践教学环节的改革实践进行了总结,实践教学改革取得了较好的成效。根据高素质人才培养的需要,在强调优化实践教学课程体系、教学内容、教学方法,加强空间思维能力、形体构形能力、创新能力、工程意识的培养等方面作了简述。     

基于应用型人才培养的工程制图课程实践教学改革研究

随着我国经济的发展,社会对工程制图类人才的需求越来越大。工程制图课程作为理工类典型的专业技术基础课具有很强的实践性,对学生后续专业课程的学习具有重要影响。传统制图类课程的教学模式对课程的实践教学重视度不高,已不能满足人才培养的需求。因此,从教学理念、课程内容、教学能力、教学方法以及考核评价体系等5个方面着手,提出了工程制图课程实践教学的改革措施,以优化教学模式,为培养符合社会发展需求的应用型人才做出贡献。     

机械制图多融合式教学模式的探索

制图课程作为工科专业的一门基础课承担着重要的作用,针对制图课程教学中存在的课时量有限、学生水平差异大、学习兴趣不足等问题。通过对教学内容、教学手段、评价方法等方面进行改革探索,形成了“传统制图教学与绘图软件教学融合、学科间内容融合、线上教学与线下教学融合”的多融合式机械制图教学新模式。实践表明,通过实施课程教学改革提升了学生综合能力,提高了教学效率,为专业基础课程改革提供了新思路。     

非机类少学时工程制图课程的改革与实践

在分析工程制图课程现状和面临形势的基础上,探讨了非机类少学时工程制图课程改革的新思想:分析了非机类少学时工程制图在教学内容、课程体系、教学方法、教学手段等方面的改革情况;指出了采用多媒体教学、研发和应用课件,是工程制图课程改革中的有效途径.     

“四年不断线”制图能力培养的研究与实践

以新一轮人才培养方案制定为契机,结合应用型人才培养目标定位,分析工程制图类课程教学存在的问题和不足;提出基于"四年不断线"制图能力培养的教学模式,即从建立制图类课程群、组建创新实践基地、组织学科竞赛以及开展技能认证等多个方面进行改革与实践,将制图能力的培养贯穿到整个大学四年学习阶段,全面提升机械类专业学生的工程制图能力。实践结果表明,改革措施可以激发学生学习兴趣,提高学生的专业技能,为应用型人才培养提供了一定的参考价值。     

基于双证融通的高职工程制图项目课程的实证研究

本文通过问卷调查、实地考察、访谈、二次文献、数理统计等方法,对我院毕业生及其所在企业进行了关于工程制图课程的问卷调查,并结合多年教学实践,提出了双证融通《工程制图》项目课程教学改革的研究方案,在教学实践中成功实施。     

工程教育专业认证背景下制图课程教学改革

学生为中心、成果导向教育和持续质量改进是工程教育专业认证的基本理念,结合工程教育专业认证的基本要求,分析了目前机械专业制图课程课堂教学模式存在的主要问题,在工程教育专业认证背景下探讨了机械专业制图课程的教学改革重点,提出了改革的思路和方法,并在机械专业制图课程教学过程中加以实践。     

浅谈高职机械类专业AutoCAD课程的教学改革与实践探索

本文针对高职机械类专业开设的AutoCAD课程,结合自身企业制图工作经验、立足当下学生的学情分析,重点从开展线上线下混合教学、优化教学内容、引进CAD图样智能评测系统、注重过程控制等方面,进行了教学研究和实践探索。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.