纤维铺放头机构的研究

纤维增强复合材料(FRP)铺放成型技术是在手工迭层铺放和纤维缠绕工艺的基础上发展起来的一种机械化、自动化成型工艺.在纤维铺放成型技术中,主要采用铺放头机构来实现铺放功能.该机构包括送料装置、加热装置、加压装置、剪切装置等.     

复合材料J型高墙壁板的研制

采用热压罐成型工艺制造复合材料J型高墙壁板,对成型模具的设计进行了优化。采用已固化高墙-未固化帽形筋条和未固化壁板共胶接方案实现了帽形加筋J型高墙壁板结构的一次整体成型。采用三角填充区纤维成型模成型纤维束,有效控制了高墙的成型。采用硬模/软模配合的工装形式保证了帽形筋条的成型质量和外形尺寸。筋条定位工装和高墙定位工装的成型方案通过工艺效果评估,证明工艺方案切实可行,对壁板类结构整体工艺成型质量的控制具有指导意义。     

玻璃纤维缠绕机结构设计和芯模参数化设计

在机械式缠绕机的基础上,增加了吐丝头的伸缩、回转机构及张力控制机构,研发出一种新型的四轴联动的玻璃纤维缠绕机。通过计算机控制使该缠绕机四轴联动,结合相应芯模的缠绕方法,可方便快速的实现对矩形芯模、压力容器芯模等常用芯模的缠绕。为了减小缠绕过程中各层纤维之间张力的影响,采用阶梯式张力控制施加的方法;为了提高芯模的设计速度,基于Solidworks完成常用芯模的参数化设计,并构建了常用芯模的模型库,实现随时调用想要特征的芯模。     

有关玻璃钢缠绕过程中一些问题的探讨

着重于探讨玻璃钢缠绕过程中芯模的旋转方式及导丝头在缠绕过程中的运动规律的一些问题.进而以求探索一种既能保持稳定的缠绕工艺质量,又能便于缠绕过程自动化应用的缠绕规律.     

基于传统玻璃纤维缠绕机的工艺改善研究

研究了缠绕机用于玻璃纤维缠绕成型工艺优化控制的问题.设计了一套完整的方案,包括主电机、液压调节装置、托辊、电磁加热系统、主控机、随动伺服小车等.采用液压升降装置通过自由托架式芯模安放、半干法数控缠绕,钢丝绳传动,整个系统实现提高缠绕精度、保证缠绕质量；还可以达到托辊不粘胶的目的,大幅提升了工作效率.     

多向纤维缠绕小样机的研制

首先对多向纤维缠绕制品的特性进行了分析。然后以实现多向纤维缠绕为基础,从总体结构、芯模零部件设计、传动系统设计以及控制系统设计等几个方面介绍了多向纤维缠绕小样机的研制。这些将为开发功能更完备的大型多向纤维缠绕机械提供很好的实践基础。     

哈夫模芯制造工艺分析

塑料压模是将酚醛塑料粉或玻璃纤维经称量后直接放入模具型腔,而后将模具闭合,在平板硫化机中加压加热,使酚醛塑料粉或玻璃纤维在加热和压力作用下充满模具并固化成型的模具。其关键零件被称作哈夫模芯的模具零件,一般是两瓣对称的锥体零件。下面以典型的线圈架塑料压模为例进行分析。     

玻璃钢管道缠绕芯模自动存取机的设计与研究

根据当前缠绕成型生产线自动化程度不高等情况,研发和设计了一套自动存取设备,以提高芯模的存取效率,从而大大提高芯模的生产效率。文中对玻璃钢管道缠绕芯模自动存取机结构进行设计,采取垂直旋转式立体仓库作为芯模存储形式、多支撑点稳定支撑、垂直循环传动、单链轮导轨式传动结构、直角坐标式搬运机械手装卸芯模方案、液压升降同步控制回路等技术措施,既提高了在纤维管道制作过程中芯模的自动存取效率,又降低了芯模在运输过程中的危险性。利用SolidWorks完成三维建模,阐述各部件功能实现原理,完成了搬运机械手的结构和芯模自动存取搬运系统的设计。根据搬运方案对搬运机械手X、Y、Z轴分别进行结构设计和建模,对Z轴液压同步控制回路进行设计。运用AnsysWorkbench对搬运机械手的X轴支撑架进行了力学特性分析,并采用基于响应面的多目标遗传算法对X轴支撑架进行优化分析,提高了结构的可靠性和稳定性。     

纤维缠绕机自动更换芯模机构的设计

分析了纤维缠绕机在缠绕过程中将芯模从输送架送至缠绕机的运动过程。设计了一套自动装卸芯模的机构,以解决更换芯模劳动强度大,效率低的问题。论述了自动装卸芯模机构的总体结构、搬运部分和传输部分的设计,为建立自动装卸芯模机构的模型并进行速度控制奠定了基础。     

兆瓦级风电桨叶生产自动化系统200FMSG

一、前言 目前我国兆瓦级风电桨叶的生产大部分由手工糊制,质量得不到保证。叶片撕裂、磨损、开胶、轴承报废的风机事故迭出,严重影响风机发电上网。本生产自动化系统系统采用模块化结构可以用在兆瓦级桨叶生产。具有纤维缠绕、铺放成型的工艺,能够实现变形多轴缠绕,外模内抛缠绕,     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

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.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

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.     

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....