Table of Content

25 June 2023, Volume 45 Issue 3

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Review Article

Research on measurement technology of ultra-precision planar optics

ZHOU Yonghao, CHANG Lin, HE Tingting, YU Yingjie

2023, 45(3):  157-176.  doi:10.3969/j.issn.0253-9608.2023.03.002

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Ultra-precision optics are the core components that determine the performance of high-end equipment and are widely used in advanced fields such as large scientific devices and precision apparatus. High-precision measurement of optical components is an important way to ensure component quality. Optical measurement technology is effective for optical component inspection because
of its non-destructive and high accuracy. First, this paper provided an overview of the main measurement technologies for ultraprecision optics, focusing on the technology principles, current research status and application bottlenecks. Secondly, for the phase demodulation problem in optical measurement technology, the wavelength shifting interferometry is used as an example. The principle and implementation process of the phase demodulation algorithm are outlined in connection with the measurement technology of ultra-precision planar optics. The principle and implementation process of the phase demodulation algorithm are outlined, and the performance of the phase demodulation algorithm is comprehensively evaluated. Finally, the future development trend of optical component measurement technology is foreseen.




Flow mechanisms in micromixers for liposome production

WANG Kang, LIU Xinyue, HU Guohui

2023, 45(3):  177-187.  doi:10.3969/j.issn.0253-9608.2023.03.003

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The production of liposomes is an important field in the research of nanomaterials and biomedical engineering nowadays. Especially, the production of lipids with controllable particle size, uniform size and adjustable components still faces a significant challenge. Micromixers, as one of the important components of microfluidics, can control the mixing of fluids through micron-scale channels to achieve efficient, accurate and controllable liposome production. This review outlines the methods of liposome production and the advantages of microfluidics, and introduces the application, advantages and disadvantages of different types of micromixers in liposome production, focusing on the flow mechanisms of different types of micromixers, aiming to provide some reference for the study of the application of micromixers in liposome production.




Research progress of magnetic-controlled electroslag remelting technology

GUO Yifeng, LI Qiang, ZHENG Tianxiang, SHEN Zhe, DING Biao, ZHONG Yunbo

2023, 45(3):  188-206.  doi:10.3969/j.issn.0253-9608.2023.03.004

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Electroslag remelting, as an important link in the production of high-end equipment materials such as special steels, is a secondary refining technology that integrates the removal of inclusions and optimization of solidified microstructure. However, with the increase of ingot size, large electroslag ingots generally have common problems such as low purity, poor homogeneity and coarse
solidified microstructure/carbides. In recent years, the use of applied magnetic field to regulate the refining and solidification process in electroslag remelting has received extensive attentions from many researchers. This paper mainly combines the research results of the group in recent years and focuses on the multi-stage enhancement of inclusions removal by magnetic-controlled electroslag remelting, solidified microstructure /carbide refinement by magnetic-controlled electroslag remelting, industrial practice of magneticcontrolled electroslag remelting technology, etc. The mechanism of the applied magnetic field to improve the purity and homogeneity of electroslag ingots is explained, and the future directions and research focus are also proposed.




A review of formation control for unmanned surface vehicles

BAO Lingzhi, DU Jiahui, HU Xinming, YUAN Xiaoyu, WENG Lei, ZHONG Yuxuan

2023, 45(3):  207-216.  doi:10.3969/j.issn.0253-9608.2023.03.005

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In order to adapt to various combat tasks in the increasingly complex marine environment, unmanned surface vehicles usually operate cooperatively in a group mode, among which unmanned surface vehicles formation control has developed rapidly in recent years. The present paper reviews the development of unmanned surface vehicle structures presently, and discusses the latest research of three key technologies, i.e., unmanned surface vehicles tasks assignment, formation control and obstacle avoidance. Finally, the research directions and future trends of unmanned vehicle formation control are summarized and prospected.




Research progress in fluid actuation technology of soft robot

LIN Yangqiao, ZHANG Quan, JIN Tao, PANG Meng, YANG Xiaoli, QI Yuxuan, XIA Binrong, QIAN Changxu, WANG Kang, LI Long, TIAN Yingzhong

2023, 45(3):  217-233.  doi:10.3969/j.issn.0253-9608.2023.03.006

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In recent years, soft robots have been the research focus in the field of robot research. Their main structures are made of hyperelastic materials or flexible materials, which have unique advantages in compliance, safety, flexibility, and cost-effectiveness.
With the development of the soft robot, the choice of its actuating mode has been particularly important. As one of the important
actuating modes of the soft robot, the fluid actuating technology can fully adapt to the complex motion of the soft robot under a high degree of freedom. We review the applications of traditional fluid actuation technologies (such as pneumatic actuation and hydraulic actuation), and discuss the latest intelligent fluid actuation technologies (such as hydraulically amplified self-healing electrostatic and electro-conjugate fluid), as well as the research progress of all-software fluid basic components. Finally, the future key research directions of fluid actuation technology are proposed.




Science for the Future

Fiber bundles: the principle of everything

ZHU Hongwei

2023, 45(3):  234-238.  doi:10.3969/j.issn.0253-9608.2023.03.007

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Fiber bundles theory is a mathematical tool to study complex systems and describes profound mathematical and physical phenomena. It has been widely applied in various fields such as differential geometry, topology, physics, and informatics. This article provides a brief overview of the origin, fundamental concepts, and theoretical foundations of fiber bundles theory, and showcases its applications in multiple domains through examples.