Comparative Study on Tool Fault Diagnosis Methods Using Vibration Signals and Cutting Force Signals by Machine Learning Technique

The state of cutting tool determines the quality of surface produced on the machined parts.A faulty tool produces poor sur face,inaccurate geometry and non-economic production.Thus,it is necessary to monitor tool condition for a.machining process to have superior quality and economic production.In the pre-sent study,fault classification of single point cutting tool for hard turning has been carried out by employing machine learning technique.Cutting force and vibration signals were acquired to monitor tool condition during machining.A set of four tooling conditions namely healthy,worn flank,broken insert and extended tool overhang have been considered for the study.The machine learning technique was applied to both vibration and cutting force signals.Discrete wavelet features of the signals have been extracted using discrete wavelet trans formation(DWT).This transformation represents a large dataset into approximation coeffcients which contain the most useful information of the dataset.Significant features,among features extracted,were selected using J48 decision tree technique.Clas-sification of tool conditions was carried out us ing Naive Bayes algorithm.A 10 fold cross validation was incorporated to test the validity of classifier.A comparison of performance of classifier was made between cutting force and vibration signal to choose the best signal acquisition method in classifying tool fault conditions using machine learning technique.

Effect of Cutting Techniques on the Structure and Magnetic Properties of a High-grade Non-oriented Electrical Steel

The high grade non-oriented electrical steel sheets containing 3.0%Si were manufacturing processed using different cutting techniques, then they were stress relief annealed（SRA）, the profiles and textures of the cutting edges were compared before and after annealing, and the magnetic properties of these specimens were tested and compared. The experimental results show that the iron loss of the specimen by water jet cutting is the lowest, but the magnetic induction under the low magnetic field is the highest, the iron loss of the specimen by laser cutting is the highest, but the magnetic induction under the low magnetic field is the lowest. It is necessary to adopt suitable production conditions and minimize the deterioration involved, and the magnetic property can be recovered by SRA effectively.

Cutting Techniques for Facilities Dismantling in Decommissioning Projects

Fuel cycle related activities were accomplished in IPEN-CNEN/SP in laboratory and pilot plant scale and most facilities were built in the 70-80 years. Nevertheless, radical changes of the Brazilian nuclear policy in the beginning of 90＇s determined the interruption of several fuel cycle activities and facilities shutdown. Some laboratory and pilot plant decommissioning activities have been performed in IPEN in the last years. During the operational activities in the decommissioning of old nuclear fuel cycle facilities, the personnel involved in the task had to face several problems. In old facilities, the need of large components dismantling and material removal use to present some difficulties, such as lack of available and near electricity supply. Besides this, the spread out of the superficial contamination in the form of dust or aerosols and the exposure of workers should be as much as possible avoided. Then, the selection and availability of suitable tools for the task, mainly those employed for cutting and segmentation of different materials is of significant importance. Slight hand tools, mainly those powered by rechargeable batteries, facilitate the work, especially in areas where the access is difficult. Based on the experience in the dismantling of some old nuclear facilities of IPEN-CNEN/SP, some tools that would have facilitated the operations were identified and their availability could have improved the quality and efficiency of different individual tasks. In this paper, different cutting problems and techniques, as well as some available commercial hand tools, are presented as suggestion for future activities.

Intravascular ultrasound-guided “extended” reverse controlled antegrade and retrograde subintimal tracking technique using a cutting balloon for recanalizing chronic coronary total occlusion with a side branch

Percutaneous coronary intervention (PCI) of chronic total occlusion (CTO) represents the most technically challenging procedure in contemporary interventional cardiology.[1] Blunt lesions and presence of proximal side branch are considered to be strong predictors of reduced technical success.[ 2,3] For such lesions, the antegrade approach may not be feasible or desirable, and the retrograde approach can be used as the initial crossing strategy. However, when treating the blunt CTO with a large side branch proximal to the occlusion, the side branch might be occluded after stent implantation if the retrograde guidewire passed the occluded segment through the subintimal space and re-entered into the true lumen at the opposite side of the side branch.[4] We reported a useful method to solve the above issue which utilizes intravascular ultrasound (IVUS) to guide “extended” reverse controlled antegrade and retrograde subintimal tracking (CART) technique with a cutting balloon.

Nutrition Bowl"Double Covering"Cutting Propagation Technique for Llex cornuta var.fortunei S.Y.Hu

Llex cornuta var.fortunei S.Y.Hu is a good ornamental tree species for viewing fruits and leaves,and has a wide range of garden uses.Nutrition bowl cutting seedlings can improve the survival rate of L.cornut a var.fortunei S.Y.Hu transplanting and greening,and has the advantages of no time limit for planting and saving management costs.Based on this,this paper introduced the container seedling double-covering cutting technology for L.cornut a var.fortunei,to provide a reference for the propagation of L.cornut a var.fortunei.

Endoscopic ultrasound fine needle aspiration:Technique and applications in clinical practice

Since its initial report in 1992,endoscopic ultrasoundguided fine needle aspiration(EUS-FNA) has now been incorporated into the diagnostic and staging algorithm for the evaluation of benign and malignant diseases of the gastrointestinal tract and of adjacent organs.Its introduction constitutes a major breakthrough in the endoscopic field and has gradually transformed EUS from a pure imaging modality into a more interventional procedure.In addition,the possibility of collecting samples,providing a definitive cytological and/or histological evidence of the presence of malignancy,has strongly contributed to changing EUS from a subjective,highly operator dependant procedure into a more objective one.This article will review the instrumentation,technique and the most important clinical applications of EUS-FNA.

Low temperature,IBA concentrations and optimal time for adventitious rooting of Eucalyptus benthamii mini-cuttings

Eucalyptus benthamii is a forest species of economic interest that has difficulty with seed production and also is considered to have difficulty with adventitious rooting using propagation techniques, such as cutting or mini-cutting. We aimed to assess the adventitious rooting percentage under different storage times in low temperatures and at various IBA （indole-3-butyric acid） concentrations to determine the optimal time of permanence for rooting Eucalyptus benthamii minicuttings in a greenhouse. Shoots collected from mini-stumps cultivated in a semi-hydroponic system were used to obtain the mini-cuttings. For the first experiment, the mini-cuttings were stored at 4℃ for 0 （immediate planting）, 24, 48, 72, 96 and 120 h. The second experiment evaluated the rooting dynamic to determine the optimal time of permanence for minicuttings in a greenhouse. The basal region of the mini-cutting was treated with various IBA solutions： 0 （free of IBA）, 1,000, 2,000, 3,000 and 4,000 mg.L^-1. Every seven days （0 （immediate planting）, 7, 14, 21 and 28 days）, destructive sampling of the mini-cuttings was performed to evaluate the histology of the adventitious rooting. Eucalyptus benthamii minicuttings should be rooted immediately after the collection of the shoots. The 2,000 mg.L^-1 IBA concentration induced a greater speed and percentage of adventitious rooting, and an interval of 35 to 42 days was indicated for permanence of the mini-cuttings in the greenhouse. Expo- sure to low temperature induced adventitious root formation with diffuse vascular connections.

Modeling by regression for laser cutting of quartz crystal

Presents the theoretical models built by analysis of the mechanism of laser cutting of quartz crystal and regression of test results for the laser cutting of quartz crystal, and comparative analysis of calculation errors for these models, and concludes with test results that these models comprehensively reflect the physical features of laser cutting of quartz crystal and satisfy the industrial production requirements, and they can be used to select right parameters for improvement of productivity and quality and saving of energy.

Power Generation Expansion Planning Using an Interior Point with Cutting Plane （IP/CP） Method

The generation expansion planning is one of complex mixed-integer optimization problems, which involves a large number of continuous or discrete decision variables and constraints. In this paper, an interior point with cutting plane （IP/CP） method is proposed to solve the mixed-integer optimization problem of the electrical power generation expansion planning. The IP/CP method could improve the overall efficiency of the solution and reduce the computational time. Proposed method is combined with the Bender＇s decomposition technique in order to decompose the generation expansion problem into a master investment problem and a slave operational problem. The numerical example is presented to compare with the effectiveness of the proposed algorithm.

原子精度制造新原理和新方法

目前航空航天、核物理、微电子、光电子和半导体等国家战略领域高性能装备的性能需求日渐严苛,核心零部件的制造精度必须迈进原子级水平,亟需研究原子精度的高性能制造新原理和新方法。本文归纳并提出了目前迫切需求的原子级表面精度、原子级结构精度、原子级损伤控制以及原子级特征尺寸结构创成四大原子精度制造核心能力,从能场辅助原子级切削、多能场辅助原子有序排布、表面能弱化原子精度材料去除以及超光学衍射极限的原子精度制造四大方向进行系统梳理,介绍了面向不同应用场景的原子精度制造新原理和新方法的研究现状,并概述了各类方法的优势和缺点,从中提炼出多能场耦合条件下的能量和原子间相互作用机理这一关键科学问题,并从四大方向上对未来我国原子级制造的基础研究提出了建议。

民族剪纸镂空技法在化妆品包装设计中的融合研究——以达斡尔民族剪纸为例

达斡尔族的文化拥有深厚的历史底蕴,其传统技艺源远流长。达斡尔族剪纸形态简单而精致,技巧一直受到各地专家们高度重视。文章对达斡尔民族剪纸的应用范围和表现形式进行研究,以现有剪纸的镂空技法与产品包装设计进行统筹性分析,通过文化特征分析和镂空技法分析,得出化妆品包装设计中融合达斡尔民族剪纸艺术形式的思路,以期通过艺术形式的再应用,传承达斡尔族的传统文化,努力推动达斡尔族地区的社会主义精神文明和物质文明发展。

朝鲜崖柏扦插技术的研究

以朝鲜崖柏为研究对象,用1-2年生嫩枝进行扦插试验。结果表明,在IBA作用下生根效果显著增强,当IBA200 mg/L浸泡1 h时,生根效果最佳,生根率为71.24%,生根效果指数为0.71;朝鲜崖柏内源激素水平可以诱导生根源基萌发,生根效果一般,生根率为53.00%,生根效果指数为0.44。

聚合物光纤发光面料的设计与开发

为了满足人们对纺织品个性化和多样化的需求,以聚合物光纤(POF)为发光体,依据光纤侧面发光原理设计开发聚合物光纤发光机织面料,介绍面料的灵感来源、光纤分布设计、组织设计、纱线设计及其排列、穿综设计、上机织造工艺等,在半自动打样机上进行试织并说明织造要点。结果表明:合理利用发光体和其他纱线,结合纬向管状组织、平纹小提花组织以及缂丝技术等,开发出更加时尚化、个性化的发光面料。发光面料主要应用于装饰纺织品,其结构独特、配色协调、立体感强,具有较强的装饰性和乐趣性,在一定程度上也起到安全警示作用。

切花月季保鲜技术最新研究进展

目的本文综述切花月季的贮藏与瓶插保鲜技术的应用与进展以及未来发展方向,以期为后续研究提供理论基础。方法分析切花月季的市场需求,概述物理和化学保鲜技术,包括控温贮藏、调湿贮藏、化学保鲜剂等。结果合适的物理和化学保鲜技术能有效延长切花月季的贮藏和瓶插期。但单一技术效果有限,存在成本、处理时间等问题。结论综合应用多种保鲜技术及探索新型保鲜剂是切花月季保鲜研究的未来发展方向。

碳钢板激光切割工艺分析及优化

随着科技的不断发展,激光切割技术已经成为现代工业生产中不可或缺的技术之一,碳钢激光切割件加工技术也得到越来越多的应用。随着对加工工件的质量要求越来越高,对激光加工工艺进行优化以获得更高切割质量与切割精度的钢板具有重要意义。为了优化碳钢的激光加工工艺,文章以3 mm碳钢为对象,采用1500 W激光器系统,研究了激光功率、切割速度、离焦量和辅助气体压力等切割参数对切割质量的影响。选取切缝宽度、表面粗糙度、挂渣高度作为评价切割质量的标准,综合分析工艺参数对切割质量的影响规律并研究了影响机理,同时通过卷积神经网络对数据进行预测分析,并采用带精英策略的非支配排序的遗传算法对工艺参数进行优化,获得辅助气体为氧气条件下激光切割碳钢的最佳工艺参数为P=1500 W、v=64 mm/s、F=2.6 bar、h=2.9 mm。通过实验发现优化后的切件切割面光滑,无挂渣现象且切缝宽度较小,达到预期标准。

传统剪纸文化与现代生活时尚的结合

通过深入挖掘剪纸文化的艺术价值和工艺手法,结合现代潮流理念,运用文化创意与现代技术的结合,实现传统剪纸文化与现代生活时尚的融合,同时也为现代设计提供一种全新的创作思路,为传统剪纸文化的传承和发展探索出前进方向。

北方切花芍药促成栽培技术

芍药在切花市场中占据重要地位,但芍药花期短且集中,为满足市场需求,该文以切花芍药为试材,结合北方设施栽培及促成栽培管理经验,通过品种选择、定植、设施栽培管理等相关技术,综合调控以保障芍药早春开花,以期为北方地区切花芍药促成栽培提供参考。

豆科牧草嫩枝扦插影响因素相关研究进展

豆科牧草在畜牧生产中具有极高的经济价值,在我国境内分布范围极广。在豆科牧草的栽培中,扦插繁殖是一种广泛使用的手段,主要包括硬枝扦插和嫩枝扦插两种繁殖方法。但豆科牧草种类繁多,扦插繁殖技术各有不同。目前,豆科牧草嫩枝扦插领域的繁殖技术研究仍面临一定的困难和限制。本研究在前人研究成果的基础上,通过对不同规格插条的选择、不同植物生长调节剂的筛选以及植物对生长环境因子的响应分析,总结了目前关于豆科嫩枝扦插繁殖技术的研究进展,为进一步开展相关领域的研究提供参考。

3D打印融合层叠技法在仿生服装设计中的运用

为研究现代仿生服装设计的表现形式,实现设计手法的多样化和创新,针对目前仿生服装实际设计运用中造型手法单一,制作效率低的问题,从仿生对象形态和工艺手段方面分析总结3种主要的造型技法,聚焦于3D打印技术和激光切割技术融合互补的优越性。在以海洋生物为仿生对象的实践中探索设计方法,证实这一流程的可行性,得出3D打印技术和层叠技法的融合在仿生服装的制作流程中具有仿生结构写实、制作效率较高、质感表现多样的优点,以期突破现有服装设计制作固定范式的限制,拓宽未来服装仿生设计的实践思路,并为此类服装的设计和制作提供参考。

钢箱梁大节段整孔吊装线形控制技术

某跨海大桥部分连续钢箱梁采用大节段整孔吊装。钢箱梁大节段由小节段接长而成,在制造阶段考虑钢箱梁预拱度设置;为确保接长后钢箱梁制造误差满足要求,钢箱梁小节段出胎前进行预拼装,检查几何尺寸,并设置线形控制点;大节段组拼时通过线形控制点定位,并对焊接完成后的几何尺寸及线形进行复核。在架设阶段,建立大节段线形调整流程,将大节段调整到指定位置确定环切量;针对大节段架设存在梁端夹角的问题,利用墩顶千斤顶顶落大节段做刚体旋转调整其夹角,使得钢梁顺接。钢箱梁大节段安装成联后,高程和平面线形偏差总体均在10 mm以内,线形控制效果总体良好。