Nanotechnology and Precision Engineering最新文献_第8页

Structure optimization of connection frames based on frequency sensitivity in macro-micro motion platforms 基于频率灵敏度的宏微运动平台连接框架结构优化

Nanotechnology and Precision Engineering Pub Date : 2019-03-01 DOI: 10.1016/j.npe.2019.03.007

Lufan Zhang , Xueli Li , Haihong Zhang , Haixin Li , Hu Li , Jun Wu

{"title":"Structure optimization of connection frames based on frequency sensitivity in macro-micro motion platforms","authors":"Lufan Zhang , Xueli Li , Haihong Zhang , Haixin Li , Hu Li , Jun Wu","doi":"10.1016/j.npe.2019.03.007","DOIUrl":"10.1016/j.npe.2019.03.007","url":null,"abstract":"<div><p>High-performance connection frames are of great significance for ultra-high acceleration and ultra-precision positioning in macro-micro motion platforms. This paper first takes the connection frame as a research object, builds a finite element model (FEM) of the natural frequency of the frame, and then verifies the correctness of this model. The frequency sensitivity method is then used to perturb the structural parameters of the FEM of the connection frame, and the sensitivities of the first-order natural frequency and mass of the corresponding structural parameters are obtained by calculation and analysis. The design variables are also determined. The natural frequency is used as the optimization objective, and the design parameters and mass of the connection frame are constrained. The structural parameters of the connecting frame are obtained through optimization, and the model is built and verified by experiments. The results show that the first-order natural frequency of the connecting frame is effectively improved by the frequency sensitivity method, avoids resonance between the connecting frame and the voice coil motor, and realizes the lightweight design of the connection frame. This research provides a reliable basis for the stable operation and ultra-precision positioning of ultra-high acceleration macro-motion platforms.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"2 1","pages":"Pages 40-47"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2019.03.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47667942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Tailoring metallic surface properties induced by laser surface processing for industrial applications 工业应用中激光表面加工诱导的裁剪金属表面性能

Nanotechnology and Precision Engineering Pub Date : 2019-03-01 DOI: 10.1016/j.npe.2019.03.003

Guoqing Hu , Yang Song , Yingchun Guan

{"title":"Tailoring metallic surface properties induced by laser surface processing for industrial applications","authors":"Guoqing Hu , Yang Song , Yingchun Guan","doi":"10.1016/j.npe.2019.03.003","DOIUrl":"10.1016/j.npe.2019.03.003","url":null,"abstract":"<div><p>As a simple, reproducible, and pollution-free technique with the potential of integration and automation, laser processing has attracted increasing attention. Laser processing, which includes laser polishing, laser cleaning, and fabrication of laser-induced micro-/nano-structures, has been demonstrated to yield smooth, clean, functional surfaces and effective joining. Laser polishing is an advanced, highly efficient, and ecofriendly polishing technology. This study demonstrated the laser polishing of a selective laser-melted Inconel 718 (IN718) superalloy and a titanium alloy sample. The surface roughnesses <em>R</em><sub>a</sub> and <em>R</em><sub>z</sub> of the IN718 superalloy were respectively reduced from 8 and 33 μm to 0.2 and 0.8 μm, and the <em>R</em><sub>a</sub> of the titanium alloy was reduced from 9.8 μm to 0.2 μm. Moreover, the wear resistance and corrosion resistance of the IN718 were apparently improved. As another surface-related processing method, laser cleaning was used to clean terminal blocks. Almost all the contaminants were removed, as verified by the absence of their chemical compositions and the decreased surface roughness. In addition, a superhydrophobic surface with a contact angle of over 160° and sliding angle of <8° on stainless steel was obtained by laser texturing treatment. These results demonstrate the high potential of laser processing in the scientific, technological, and industrial fields.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"2 1","pages":"Pages 29-34"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2019.03.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46733024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Characterization of machine tools and measurement system for micromilling 微铣削机床和测量系统的特性

Nanotechnology and Precision Engineering Pub Date : 2019-03-01 DOI: 10.1016/j.npe.2019.03.006

Andrea Abeni, Matteo Lancini, Aldo Attanasio

引用次数: 9

Surface-enhanced Raman scattering on nanodiamond-derived carbon onions 纳米金刚石衍生碳洋葱表面增强拉曼散射

Nanotechnology and Precision Engineering Pub Date : 2019-03-01 DOI: 10.1016/j.npe.2019.03.005

Ying Song , Zongwei Xu , Andreas Rosenkranz , Mathias Rommel , Changkun Shi , Fengzhou Fang

{"title":"Surface-enhanced Raman scattering on nanodiamond-derived carbon onions","authors":"Ying Song , Zongwei Xu , Andreas Rosenkranz , Mathias Rommel , Changkun Shi , Fengzhou Fang","doi":"10.1016/j.npe.2019.03.005","DOIUrl":"10.1016/j.npe.2019.03.005","url":null,"abstract":"<div><p>Annealing nanodiamonds (ND) at high temperatures up to 1700 °C is a common method to synthesize carbon onions. The transformation from NDs to carbon onions is particularly interesting because of carbon onions' potential in the field of tribology and their application in ultra-charge/discharge devices. In this paper, a novel surface-enhanced Raman scattering technique that involves coating the sample with nanoscopic gold particles is proposed to characterize the NDs after different annealing treatments. Conventional Raman and surface-enhanced Raman spectra were obtained, and the changes of peak parameters as the function of annealing temperature were evaluated. It was found that the widths of the D and the G peaks decreased with increasing annealing temperature, reflecting an improved order in the sp<sup>2</sup>-hybridized carbon during the transformation from NDs to carbon onions. After annealing at 1700 °C, the sp<sup>2</sup>‑carbon was highly ordered, indicating desirable electrical conductivity and lubricity. With increasing annealing temperature, the D peak showed a blue shift of almost 30 cm<sup>−1</sup>, while the G peak merely shifted by 5 cm<sup>−1</sup>. For annealing temperatures above 1100 °C, an increase of intensity ratio <em>I</em><sub>D</sub>/<em>I</em><sub>G</sub> was observed. Compared to the uncoated area, red shifts of 0.5–2 cm<sup>−1</sup> and of 5–9 cm<sup>−1</sup> for the G and D peaks, respectively, were detected for the gold-coated area, which was due to the coupling of the plasmons and the phonons of the samples.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"2 1","pages":"Pages 35-39"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2019.03.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41841303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Theoretical and experimental characterizations of gigahertz acoustic streaming in microscale fluids 微尺度流体中千兆赫声波流的理论和实验表征

Nanotechnology and Precision Engineering Pub Date : 2019-03-01 DOI: 10.1016/j.npe.2019.03.004

Weiwei Cui, Wei Pang, Yang Yang, Tiechuan Li, Xuexin Duan

{"title":"Theoretical and experimental characterizations of gigahertz acoustic streaming in microscale fluids","authors":"Weiwei Cui, Wei Pang, Yang Yang, Tiechuan Li, Xuexin Duan","doi":"10.1016/j.npe.2019.03.004","DOIUrl":"10.1016/j.npe.2019.03.004","url":null,"abstract":"<div><p>Even as gigahertz (GHz) acoustic streaming has developed into a multi-functional platform technology for biochemical applications, including ultrafast microfluidic mixing, microparticle operations, and cellar or vesicle surgery, its theoretical principles have yet to be established. This is because few studies have been conducted on the use of such high frequency acoustics in microscale fluids. Another difficulty is the lack of velocimetry methods for microscale and nanoscale fluidic streaming. In this work, we focus on the basic aspects of GHz acoustic streaming, including its micro-vortex generation principles, theoretical model, and experimental characterization technologies. We present details of a weak-coupled finite simulation that represents our current understanding of the GHz-acoustic-streaming phenomenon. Both our simulation and experimental results show that the GHz-acoustic-induced interfacial body force plays a determinative role in vortex generation. We carefully studied changes in the formation of GHz acoustic streaming at different acoustic powers and flow rates. In particular, we developed a microfluidic-particle-image velocimetry method that enables the quantification of streaming at the microscale and even nanoscale. This work provides a full map of GHz acoustofluidics and highlights the way to further theoretical study of this topic.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"2 1","pages":"Pages 15-22"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2019.03.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43946938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Investigation of the performance of a pilot-scale barrel atmospheric plasma system for plasma activation of polymer particles 用于聚合物颗粒等离子体活化的中试桶形大气等离子体系统的性能研究

Nanotechnology and Precision Engineering Pub Date : 2019-03-01 DOI: 10.1016/j.npe.2019.03.002

Hisham M. Abourayana , Peter J. Dobbyn , Pat Whyte , Denis P. Dowling

{"title":"Investigation of the performance of a pilot-scale barrel atmospheric plasma system for plasma activation of polymer particles","authors":"Hisham M. Abourayana , Peter J. Dobbyn , Pat Whyte , Denis P. Dowling","doi":"10.1016/j.npe.2019.03.002","DOIUrl":"10.1016/j.npe.2019.03.002","url":null,"abstract":"<div><p>This study reports the development and performance of a pilot-scale barrel atmospheric plasma reactor for the atmospheric plasma activation treatment of polymer particles. The polymer particles treated included acrylonitrile butadiene styrene (ABS) and polypropylene (PP). These particles had diameters in the range of 3–5 mm. The initial studies were carried out using a laboratory-scale barrel reactor designed to treat polymer particle batch sizes of 20 g. A pilot-scale reactor that could treat 500 g particle batch sizes was then developed to facilitate pre-industrial-scale treatments. The effect of operating pulse density modulation (PDM) in the range 10%–100% and plasma treatment time on the level of activation of the treated polymers were then investigated. ABS revealed a larger decrease in water contact angle compared with PP after plasma treatment under the same conditions. The optimal treatment time of ABS (400 g of polymer particles) in the pilot-scale reactor was 15 min. The plasma-activated polymer particles were used to fabricate dog-bone polymer parts through injection molding. Mechanical testing of the resulting dog-bone polymer parts revealed a 10.5% increase in tensile strength compared with those fabricated using non-activated polymer particles.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"2 1","pages":"Pages 1-7"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2019.03.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"54851018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Review of low timing jitter mode-locked fiber lasers and applications in dual-comb absolute distance measurement 低时序抖动锁模光纤激光器及其在双梳绝对距离测量中的应用综述

Nanotechnology and Precision Engineering Pub Date : 2018-12-01 DOI: 10.1016/j.npe.2018.12.002

Haosen Shi , Youjian Song , Runmin Li, Yuepeng Li, Hui Cao, Haochen Tian, Bowen Liu, Lu Chai, Minglie Hu

{"title":"Review of low timing jitter mode-locked fiber lasers and applications in dual-comb absolute distance measurement","authors":"Haosen Shi , Youjian Song , Runmin Li, Yuepeng Li, Hui Cao, Haochen Tian, Bowen Liu, Lu Chai, Minglie Hu","doi":"10.1016/j.npe.2018.12.002","DOIUrl":"10.1016/j.npe.2018.12.002","url":null,"abstract":"<div><p>Passively mode-locked fiber lasers emit femtosecond pulse trains with excellent short-term stability. The quantum-limited timing jitter of a free running femtosecond erbium-doped fiber laser working at room temperature is considerably below one femtosecond at high Fourier frequency. The ultrashort pulse train with ultralow timing jitter enables absolute time-of-flight measurements based on a dual-comb implementation, which is typically composed of a pair of optical frequency combs generated by femtosecond lasers. Dead-zone-free absolute distance measurement with sub-micrometer precision and kHz update rate has been routinely achieved with a dual-comb configuration, which is promising for a number of precision manufacturing applications, from large step-structure measurements prevalent in microelectronic profilometry to three coordinate measurements in large-scale aerospace manufacturing and shipbuilding. In this paper, we first review the sub-femtosecond precision timing jitter characterization methods and approaches for ultralow timing jitter mode-locked fiber laser design. Then, we provide an overview of the state-of-the-art dual-comb absolute ranging technology in terms of working principles, experimental implementations, and measurement precisions. Finally, we discuss the impact of quantum-limited timing jitter on the dual-comb ranging precision at a high update rate. The route to high-precision dual-comb range finder design based on ultralow jitter femtosecond fiber lasers is proposed.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 4","pages":"Pages 205-217"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2018.12.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48690146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 28

CFD-based design and analysis of air-bearing-supported paint spray spindle 基于cfd的空气支承喷漆主轴设计与分析

Nanotechnology and Precision Engineering Pub Date : 2018-12-01 DOI: 10.1016/j.npe.2018.12.004

Ali Khaghani, Kai Cheng

{"title":"CFD-based design and analysis of air-bearing-supported paint spray spindle","authors":"Ali Khaghani, Kai Cheng","doi":"10.1016/j.npe.2018.12.004","DOIUrl":"10.1016/j.npe.2018.12.004","url":null,"abstract":"<div><p>In this paper, an analytical scientific approach is presented for the design and analysis of an air-turbine-driven paint spray spindle, and it is used to improve further the design concept of the existing spindle applied in automotive coating and paint spraying applications. The current spindle on the market can operate at a maximum speed of 100,000 rpm and features a maximum bell size of 70 mm diameter. Given the increasing demands for high automotive coating/painting quality and productivity in assembly, the design and development of a paint spray spindle with a speed of 145,000 rpm or higher is needed. Computational fluid dynamics (CFD)-based simulation is applied in the approach. Accordingly, CFD simulation-based design and analysis are undertaken, covering the characteristic factors of velocity, pressure of the air supply, rotational speed of the air-turbine, and torque and force reaction on the turbine blades. Furthermore, the turbine blade geometric shape is investigated through the simulations. Three geometrical concepts have been investigated against the original model. The results on Concept_03 verified the higher angular velocity speeds against the theoretical model. The pressure and velocity effects in the blades have been investigated. The results show that the pressure and velocity of the air supply driving the turbine are critical factors influencing the stability of turbine spinning. The results also demonstrate that the force acting on the blades is at the highest level when the adjacent face changes from a straight surface into a curve. Finally, changing the geometrical shape in the turbine likely increases the tangential air pressure at the blades surface and relatively increases the magnitude of the lateral torque and force in the spindle. Notwithstanding this condition, the analytical values surpass the theoretical target values.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 4","pages":"Pages 226-235"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2018.12.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48939665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on tool wear and tool life prediction in micro-milling of Ti-6Al-4V Ti-6Al-4V微铣削刀具磨损及寿命预测研究

Nanotechnology and Precision Engineering Pub Date : 2018-12-01 DOI: 10.1016/j.npe.2018.12.005

Amin Dadgari , Dehong Huo , David Swailes

{"title":"Investigation on tool wear and tool life prediction in micro-milling of Ti-6Al-4V","authors":"Amin Dadgari , Dehong Huo , David Swailes","doi":"10.1016/j.npe.2018.12.005","DOIUrl":"10.1016/j.npe.2018.12.005","url":null,"abstract":"<div><p>Short tool life and rapid tool wear in micromachining of hard-to-machine materials remain a barrier to the process being economically viable. In this study, standard procedures and conditions set by the ISO for tool life testing in milling were used to analyze the wear of tungsten carbide micro-end-milling tools through slot milling conducted on titanium alloy Ti-6Al-4V. Tool wear was characterized by flank wear rate, cutting-edge radius change, and tool volumetric change. The effect of machining parameters, such as cutting speed and feedrate, on tool wear was investigated with reference to surface roughness and geometric accuracy of the finished workpiece. Experimental data indicate different modes of tool wear throughout machining, where nonuniform flank wear and abrasive wear are the dominant wear modes. High cutting speed and low feedrate can reduce the tool wear rate and improve the tool life during micromachining. However, the low feedrate enhances the plowing effect on the cutting zone, resulting in reduced surface quality and leading to burr formation and premature tool failure. This study concludes with a proposal of tool rejection criteria for micro-milling of Ti-6Al-4V.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 4","pages":"Pages 218-225"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2018.12.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43773484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 45

Effect of particle-particle interaction on dielectrophoretic single particle trap in a sudden contraction flow 突然收缩流中粒子-粒子相互作用对介电单粒子阱的影响

Nanotechnology and Precision Engineering Pub Date : 2018-12-01 DOI: 10.1016/j.npe.2018.12.006

Haihang Cui, Rui Ma, Li Chen, Hongyan Zhang

{"title":"Effect of particle-particle interaction on dielectrophoretic single particle trap in a sudden contraction flow","authors":"Haihang Cui, Rui Ma, Li Chen, Hongyan Zhang","doi":"10.1016/j.npe.2018.12.006","DOIUrl":"10.1016/j.npe.2018.12.006","url":null,"abstract":"<div><p>Dielectrophoretic (DEP) force is significant in manipulating tiny objects in micro/nano scale. To study the effect of electric interaction force on particle manipulation, a microstructure consisting of a pair of strip electrodes and a sudden contraction micro-channel was constructed. Besides DEP force and hydrodynamic force acting on single particle, the numerical model also involved electric interaction force and force moment on two particles. The analyses revealed that the particle-particle interaction force was in the same order as that of DEP force on single trapped particle. The interaction force resulted in trapping single particle failure under continuous DEP force. Thus, pulsed DEP force, turning on/off DEP force at a given time interval, was suggested. During the “off” period, the velocity difference of the two particles located at sudden contraction micro-channel enlarged the gap between them and further weakened the particle-particle interaction. By a proof-of-concept experiment, both the trapping behavior of single particle and that of two particles were in good agreement with the model. With carefully controlled parameters, the reliable function of retaining single particle was realized by pulsed DEP.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 4","pages":"Pages 236-241"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.npe.2018.12.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47938706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2