High performance ultra-precision turning of large-aspect-ratio rectangular freeform optics

CIRP Annals ◽  
2018 ◽  
Vol 67 (1) ◽  
pp. 543-546 ◽  
Author(s):  
Xiaodong Zhang ◽  
Zexiao Li ◽  
Guoxiong Zhang
Keyword(s):  
Aspect Ratio ◽  
High Performance ◽  
Large Aspect Ratio ◽  
Precision Turning ◽  
Freeform Optics ◽  
Ultra Precision

scholarly journals Highly efficient machining of non-circular freeform optics using fast tool servo assisted ultra-precision turning

2017 ◽  
Vol 25 (21) ◽  
pp. 25243 ◽  
Author(s):  
Zexiao Li ◽  
Fengzhou Fang ◽  
Xiaodong Zhang ◽  
Xianlei Liu ◽  
Huimin Gao
Keyword(s):  
Fast Tool Servo ◽  
Precision Turning ◽  
Highly Efficient ◽  
Freeform Optics ◽  
Ultra Precision

scholarly journals Machining approach of freeform optics on infrared materials via ultra-precision turning

2017 ◽  
Vol 25 (3) ◽  
pp. 2051 ◽  
Author(s):  
Zexiao Li ◽  
Fengzhou Fang ◽  
Jinjin Chen ◽  
Xiaodong Zhang
Keyword(s):  
Precision Turning ◽  
Freeform Optics ◽  
Ultra Precision ◽  
Infrared Materials

Facile preparation of WO3 nano-fibers with super large aspect ratio for high performance supercapacitor

2019 ◽  
Vol 772 ◽  
pp. 933-942 ◽  
Author(s):  
Feng Zheng ◽  
Cuiping Xi ◽  
Jiahe Xu ◽  
Yi Yu ◽  
Weiguang Yang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Performance ◽  
Large Aspect Ratio ◽  
Facile Preparation

Basic Study on Polishing Technology for Microcavity With Electrically Controlled Slurry

2020 ◽  
Author(s):  
Yuka Hayama ◽  
Yasuhiro Kakinuma
Keyword(s):  
High Performance ◽  
Optical Signal ◽  
Basic Study ◽  
Suitable Material ◽  
Frequency Combs ◽  
Optical Microcavity ◽  
Precision Turning ◽  
Short Period ◽  
Wide Range ◽  
Ultra Precision

Abstract Optical microcavity, which can localize light at a certain spot for a short period of time, have a wide range of applications, such as optical signal processing and optical frequency combs. Single crystal calcium fluoride is one of the most suitable material for fabricating optical microcavity due to its excellent optical properties; however, it cannot be manufactured by chemical processes such as etching due to its crystal anisotropy. Currently, high performance optical microcavities are fabricated by ultra-precision turning followed by a hand polishing process because it has complex shape with a size of micro order. However, hand polishing deteriorates the shape made by ultra-precision turning and has a low reproductivity. Therefore, a development of a soft mechanical polishing method to replace hand polishing is strongly desired. Electrically controlled slurry technique is a promising approach in polishing of microparts, where AC electric field is applied to the slurry in order to control the distribution of abrasives to improve the polishing properties in free abrasive polishing. In this study, polishing by applying electrically controlled slurry was conducted for microcavity and the influence of frequency and applied voltage were investigated. From the experimental results, clear differences in the surface quality of microcavity were shown according to amplitude of AC voltage and its frequency.

Experimental and numerical investigation on inner flow and spray characteristics of elliptical GDI injectors with large aspect ratio

Energy ◽  
2021 ◽  
Vol 224 ◽  
pp. 120119
Author(s):  
Shenghao Yu ◽  
Bifeng Yin ◽  
Qinsheng Bi ◽  
Chen Chen ◽  
Hekun Jia
Keyword(s):  
Aspect Ratio ◽  
Numerical Investigation ◽  
Large Aspect Ratio ◽  
Spray Characteristics

scholarly journals Effects of Steel Fiber Percentage and Aspect Ratios on Fresh and Harden Properties of Ultra-High Performance Fiber

2021 ◽  
Vol 2 (3) ◽  
pp. 501-515
Author(s):  
Rajib Kumar Biswas ◽  
Farabi Bin Ahmed ◽  
Md. Ehsanul Haque ◽  
Afra Anam Provasha ◽  
Zahid Hasan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aspect Ratio ◽  
High Performance ◽  
Steel Fiber ◽  
Setting Time ◽  
Fiber Reinforced Concrete ◽  
Future Research ◽  
Manufacturing Cost ◽  
Aspect Ratios ◽  
High Performance Fiber

Steel fibers and their aspect ratios are important parameters that have significant influence on the mechanical properties of ultrahigh-performance fiber-reinforced concrete (UHPFRC). Steel fiber dosage also significantly contributes to the initial manufacturing cost of UHPFRC. This study presents a comprehensive literature review of the effects of steel fiber percentages and aspect ratios on the setting time, workability, and mechanical properties of UHPFRC. It was evident that (1) an increase in steel fiber dosage and aspect ratio negatively impacted workability, owing to the interlocking between fibers; (2) compressive strength was positively influenced by the steel fiber dosage and aspect ratio; and (3) a faster loading rate significantly improved the mechanical properties. There were also some shortcomings in the measurement method for setting time. Lastly, this research highlights current issues for future research. The findings of the study are useful for practicing engineers to understand the distinctive characteristics of UHPFRC.

scholarly journals Strength Analysis of Alternative Airframe Layouts of Regional Aircraft on the Basis of Automated Parametrical Models

Aerospace ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 80
Author(s):  
Dmitry V. Vedernikov ◽  
Alexander N. Shanygin ◽  
Yury S. Mirgorodsky ◽  
Mikhail D. Levchenkov
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
High Performance ◽  
Strength Analysis ◽  
Labor Input ◽  
Aerodynamic Loading ◽  
Aspect Ratios ◽  
Wide Range ◽  
Parametrical Design

This publication presents the results of complex parametrical strength investigations of typical wings for regional aircrafts obtained by means of the new version of the four-level algorithm (FLA) with the modified module responsible for the analysis of aerodynamic loading. This version of FLA, as well as a base one, is focused on significant decreasing time and labor input of a complex strength analysis of airframes by using simultaneously different principles of decomposition. The base version includes four-level decomposition of airframe and decomposition of strength tasks. The new one realizes additional decomposition of alternative variants of load cases during the process of determination of critical load cases. Such an algorithm is very suitable for strength analysis and designing airframes of regional aircrafts having a wide range of aerodynamic concepts. Results of validation of the new version of FLA for a high-aspect-ratio wing obtained in this work confirmed high performance of the algorithm in decreasing time and labor input of strength analysis of airframes at the preliminary stages of designing. During parametrical design investigation, some interesting results for strut-braced wings having high aspect ratios were obtained.

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