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《电子技术与软件工程》2017,(6)
FDM技术是3D打印应用最为广泛的类型。论文充分结合碳纤维复合材料与3D打印技术的优势,通过对以碳纤维材料为基础的成型工艺的研究,形成集三维模型动态处理、打印过程动态监测、打印工艺动态调整、打印故障动态处理的智能3D打印系统。解决3D打印技术在成型性能、成型精度和系统智能性的问题,填补碳纤维3D打印工业应用的空白。 相似文献
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复杂曲面3D打印受到振荡因素的影响,导致精度不高,为了提高复杂曲面3D打印精度,提出基于激光技术的复杂曲面3D打印精度控制方法。根据3D打印区域的曲线演化速度进行边界轮廓检测,对初始轮廓不敏感性区域进行激光检测,在复杂曲面中引入外部能量项进行3D打印的小扰动稳定性控制,构建复杂曲面3D打印精度控制目标函数,采用线性规划模型进行复杂曲面3D打印过程中的收敛性测试和全局规划设计,引入激光技术进行打印过程中的误差反馈调节,结合模糊PID控制方法,实现复杂曲面3D打印精度控制优化设计。仿真结果表明,采用该方法进行复杂曲面3D打印精度控制的收敛性较好,抗扰动能力较强,提高了复杂曲面3D打印的控制精度和鲁棒性。 相似文献
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3D打印技术是一项基于计算机软件三维数字化建模基础的新型快速成型技术.近年来,随着现科技的发展,3D打印技术日益成熟,在陶瓷产品设计中的应用与日俱增.主要分两种方式进行,第一种采用ABS、PLA、TPU、尼龙材料进行打印模型,再进行陶瓷开模、翻模等一系列陶瓷生产工艺.另一种就是用陶泥直接打印成陶瓷素坯,再进行上釉、烧制等环节,这种方法可以省去开模、翻模等生产环节. 相似文献
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传统的植物照明设计只针对单一参考面均匀度进行评价,难以满足植物在整个生长过程中对均匀光照环境的需求。针对这一问题,首先提出了空间照明均匀度评价体系,并基于该体系设计了一种复合光源模块的立体化照明系统,以期构建照明均匀的植物生长空间。进一步利用Taguchi方法优化实验过程,在结合ANOVA分析的基础上,获得了最优结构参数。最后对所得最优解进行灯珠形状分析和植物生长过程中的照明效果测试。实验结果表明:最优结构可提供一个水平参考面照度均匀度为87.22%,混色均匀度为90.11%;竖直参考面照度均匀度93.02%,混色均匀度91.43%的均匀照明空间。该植物光源系统可满足植物生长过程中对均匀空间照明环境的需求。 相似文献
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3D打印作为一种全新的迅速成型的技术,被越来越多的社会大众所关注.文中主要以3D打印技术为着手点,结合中职CAD教学,深入讨论其技术会为CAD教学带来何种变化,重点阐述了3D打印技术在CAD教学中的运用策略,以期可以有效推动我国技工院校CAD教学的有序发展. 相似文献
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为了改善传统的数字光处理投影系统(DLP)体积较大、结构复杂、成本较高、对光源的利用效率较低的问题,采用一种基于单颗三色发光二极管作为照明光源,单颗透镜形成平行光的新型DLP投影光路结构的方法,对传统光路进行了改进与优化。无需传统光路中的色轮,透镜直接实现了传统投影光路中聚光和匀光的复杂结构,并利用TRACEPRO软件进行建模,通过光线追迹对该投影光路进行了光学分析。结果表明,整个光学系统的体积控制在76.8mm×32.2mm×25mm,光能利用率达到了60.1%,光斑均匀性达到了96.6%,屏幕表面的光通量为21.7lm。该研究减小了投影光路体积,简化了光学结构,提高了光能利用率。 相似文献
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3D printing is becoming a disruptive technology and shows great potential for various practical applications. Specially, digital light processing (DLP) 3D printing demonstrates advantages in high resolution and high efficiency. However, extensive production of infusible and insoluble thermosets in DLP printing causes serious resource waste and environmental problems after its disposal. Herein, a reprintable linear polymer is reported for repeatable DLP printing. Taking advantage of the dissolution of linear polymer in its monomer, printed objects can be recycled into liquid resin and reprinted via the same DLP. Polymerization kinetics and printing resolution of recycled resins and mechanical properties of reprinted polymers retain identical as the original. The thermoplastic nature of linear polymer endows 3D objects with welding and reshaping property. Recyclable composites are also successfully fabricated, and sustainable usage of high-value fillers comes true. This strategy helps to address environmental issues arising from unprocessable thermosets and may contribute to an efficient materials recycling. 相似文献
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Pengrui Wang David B. Berry Zhaoqiang Song Wisarut Kiratitanaporn Jacob Schimelman Amy Moran Frank He Brian Xi Shengqiang Cai Shaochen Chen 《Advanced functional materials》2020,30(14)
The majority of 3D‐printed biodegradable biomaterials are brittle, limiting their application to compliant tissues. Poly(glycerol sebacate) acrylate (PGSA) is a synthetic biocompatible elastomer and compatible with light‐based 3D printing. In this article, digital‐light‐processing (DLP)‐based 3D printing is employed to create a complex PGSA network structure. Nature‐inspired double network (DN) structures consisting of interconnected segments with different mechanical properties are printed from the same material in a single shot. Such capability has not been demonstrated by any other fabrication techniques so far. The biocompatibility of PGSA is confirmed via cell‐viability analysis. Furthermore, a finite‐element analysis (FEA) model is used to predict the failure of the DN structure under uniaxial tension. FEA confirms that the DN structure absorbs 100% more energy before rupture by using the soft segments as sacrificial elements while the hard segments retain structural integrity. Using the FEA‐informed design, a new DN structure is printed and tensile test results agree with the simulation. This article demonstrates how geometrically‐optimized material design can be easily and rapidly constructed by DLP‐based 3D printing, where well‐defined patterns of different stiffnesses can be simultaneously formed using the same elastic biomaterial, and overall mechanical properties can be specifically optimized for different biomedical applications. 相似文献
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QoS路由选择:问题与解决方法综述 总被引:18,自引:0,他引:18
保证服务质量的QoS路由(Quality of Service Routing)是网络中解决QoS问题的一项关键技术.QoS路由的主要目标是为接入的业务选择满足服务质量要求的传输路径,同时保证整个网络资源的有效利用.度量参数选择问题、寻路问题和路由信息不准确问题是QoS路由中的几个主要研究内容.本文围绕这三个方面,介绍了QoS路由中的主要问题及相关的解决办法,并探讨了今后QoS路由可能的研究方向. 相似文献
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数字微反射镜器件(DMD)是数字式光处理(DLP)投影显示技术的核心,有着巨大的应用潜力。叙述了DMD的控制原理和特点。首先,基于DMD数字微镜控制器的驱动控制系统和采用二进制脉宽调制(BPWM)技术精确控制光源,接收PC机传输的实时图像显示数据,生成控制DMD翻转的控制时序及其复位脉冲信号,搭建了蓝光半导体激光投影光刻装置,实现了高分辨率灰度图像的分层曝光和曝光量的精确控制;其次,基于DLP投影系统,采用RGB激光源,通过光纤耦合和合束,建立了激光投影实验装置。 相似文献
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数字光处理(DLP)投影系统 总被引:8,自引:1,他引:8
数字光处理(DLP)投影显示技术的核心是数字微镜器件(DMD),这是一种基于半导体制造技术、由高速数字式光反射开关阵列组成的器件,采用二进制脉宽调制技术能精确地控制光源。DLP技术提供了全数字投影显示,在清晰度、亮度、对比度和色彩还原方面能提供高质量的图像。 相似文献
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S. Macrae Montgomery Frédéric Demoly Kun Zhou H. Jerry Qi 《Advanced functional materials》2023,33(17):2213252
Digital light processing (DLP) is a widely used additive manufacturing technique for functional applications due to its high accuracy and print speeds. However, a variety of factors such as pixel size, motion stage resolution, optical focus, and chemical properties of the resin limit DLP's minimum resolution. Recently, research into locally varying light intensities has led to the emergence of grayscale DLP printing, which offers new capabilities including sub-pixel manipulation of the printed shape. Here, a methodology is developed to enhance accuracy beyond what is typically capable for a given projector resolution by using pixel-level grayscale control to create round features from sharp pixels. A numerical representation of the DLP pixel shape is developed to account for the effects of the incident light patterns. A reaction-diffusion model is then used to predict the printed shapes before and after grayscale enhancement. This model is used to determine the optimal pixel intensities to match a target shape. Finally, the minimum feature size allowed by the proposed method is explored. The promising results represent an important step forward in raising DLP printing to higher accuracy, which will allow the fabrication of functional and structural components with smaller features or smoother faces. 相似文献
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基于ZEMAX的半导体激光器匀光设计 总被引:1,自引:0,他引:1
为了满足半导体激光器能量均匀化的应用需求,基于ZEMAX光学设计软件设计了一套光束整形匀光系统。采用非球面镜与倒置柱面镜望远系统的透镜组合对单模半导体激光器进行准直,得到近似高斯圆光斑;在推导了基模高斯强度分布的匀光投影半径的基础上,利用ZEMAX优化得到两个非球面镜组成的匀光透镜组,在一定范围内可获得能量均匀度达96%以上的圆光斑。同时,实现了一个大功率半导体激光器光纤耦合模块的能量匀化设计,满足对能量匀化要求较高的应用。结果表明,该研究为半导体激光器能量均匀化的应用提供了有效方法。 相似文献