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| 1 | Computational Research on Modular Undulating Fin for Biorobotic Underwater Propulsor显示文摘Biomimetic design employs the principles of nature to solve engineering problems. Such designs which are hoped to be quick,efficient,robust,and versatile,have taken advantage of optimization via natural selection. In the present research,an environment-friendly propulsion system mimicking undulating fins of stingray was built. A non-conventional method was considered to model the flexibility of the fins of stingray. A two-degree-of-freedom mechanism comprised of several linkages was designed and constructed to mimic the actual flexible fin. The driving linkages were used to form a mechanical fin con-sisting of several fin segments,which are able to produce undulations,similar to those produced by the actual fins. Owing to the modularity of the design of the mechanical fin,various undulating patterns can be realized. Some qualitative observations,obtained by experiments,predicted that the thrusts produced by the mechanical fin are different among various undulating patterns. To fully understand this experimental phenomenon is very important for better performance and energy saving for our biorobotic underwater propulsion system. Here,four basic undulating patterns of the mechanical fin were performed using two-dimensional unsteady computational fluid dynamics (CFD) method. An unstructured,grid-based,unsteady Navier-Stokes solver with automatic adaptive re-meshing was used to compute the unsteady flow around the fin through twenty complete cycles. The pressure distribution on fin surface was computed and integrated to provide fin forces which were decomposed into lift and thrust. The pressure force and friction force were also computed throughout the swimming cycle. Finally,vortex contour maps of these four basic fin undulating patterns were displayed and compared. | Yong-hua Zhang Lai-bing Jia Shi-wu Zhang Jie Yang K. H. Low | 2007 | Journal of Bionic Engineering2007，4，1： | 17 |
| 2 | Numerical and Experimental Research on Modular Oscillating Fin显示文摘Fishes are famous for their ability to position themselves accurately even in turbulent flows. This ability is the result of the coordinated movement of fins which extend from the body. We have embarked on a research program designed to develop an agile and high efficient biologically inspired robotic fish based on the performance of hybrid mechanical fins. To accomplish this goal, a mechanical ray-like fin actuated by Shape Memory Alloy (SMA) is developed, which can realize both oscillatory locomotion and undulatory locomotion. We first give a brief introduction on the mechanical structure of our fin and then carry out theoretic analysis on force generation. Detailed information of these theoretical results is later revealed by Computational Fluid Dynamic (CFD), and is final validated by experiments. This robotic fin has potential application as a propulsor for future underwater vehicles in addition to being a valuable scientific instrument. | Yong-hua Zhang Yan Song Jie Yang K. H. Low | 2008 | Journal of Bionic Engineering2008，5，1： | 8 |
| 3 | Parametric Study of an Underwater Finned Propulsor Inspired by Bluespotted Ray显示文摘 | Yonghua Zhang Jianhui He K. H. LOW | 2012 | Journal of Bionic Engineering2012，9，2： | 8 |
| 4 | Bionic asymmetry:from amiiform fish to undulating robotic fins显示文摘Similar to bionic non-smooth which has been successfully applied in anti-resistance and anti-adhesion, bionic asymmetry is also an inherent property of biological systems and is worth exploring for con-ceivable pragmatic applications. Therefore, bionic asymmetry for undulations is of main interest in this paper. We initially investigate bionic asymmetry with a case study of the undulating robotic fin, RoboGnilos, which evolved from the long dorsal fin of Gymnarchus niloticus in the amiiform mode. Since the performance of the pre-existing undulating fins is hardly satisfactory, we obtain bionic in-spirations of undulatory asymmetry through observations and measurements on the specimen of G. niloticus, to improve upon the performance. Consequently, the newly acquired innovation for bionic asymmetry is incorporated into the previously derived kinematics model, and also applied to the experimental prototype. Both computational and experimental results verify that bionic asymmetric undulation generates better propulsion performance (in terms of linear velocity and efficiency) than the traditional symmetric modes with the same undulatory parameters. | HU TianJiang SHEN LinCheng LOW K. H. | 2009 | Chinese Science Bulletin2009，54，4： | 7 |
| 5 | Reliability analysis using object-oriented constrained optimization显示文摘 | Bak K. Low Wilson H. Tang | 2003 | Structural Safety2003，，1： | 1 |
| 6 | Diagnostic Performance of Magnetic Resonance Elastography in Staging Liver Fibrosis: A Systematic Review and Meta-analysis of Individual Participant Data显示文摘 | Siddharth Singh Sudhakar K. Venkatesh Zhen Wang Frank H. Miller Utaroh Motosugi Russell N. Low Tarek Hassanein Patrick Asbach Edmund M. Godfrey Meng Yin Jun Chen Andrew P. Keaveny Mellena Bridges Anneloes Bohte Mohammad Hassan Murad David J. Lomas Jayant | 2014 | Clinical Gastroenterology and Hepatology2014，，： | 1 |
| 7 | Reliability analysis using object-oriented constrained optimization显示文摘 | Bak K. Low Wilson H. Tang | 2003 | Structural Safety2003，，1： | 1 |
| 8 | Water infiltration characteristics of unsaturated soil slope and its effect on suction and stability显示文摘 | Bujang B. K. Huat Faisal HJ. Ali T. H. Low | 2006 | Geotechnical and Geological Engineering2006，，5： | 1 |
| 9 | Primary and secondary restorative proctocolectomy for familial adenomatous polyposis: complications and long‐term bowel function显示文摘 | S. Bülow H. H?jen S. Buntzen K. L. Larsen L. Preisler N. Qvist | 2013 | Colorectal Disease2013，，4： | 1 |
| 10 | Genomics and introgression: Discovery and mapping of thousands of species-diagnostic SNPs using RAD sequencing显示文摘 | Brian K. HAND Tyler D. HETHER Ryan P. KOVACH Clint C. MUHLFELD Stephen J. AMISH Matthew C. BOYER Sean M. O'ROURKE Michael R. MILLER Winsor H. LOWE Paul A. HOHENLOHE Gordon LUIKART | 2015 | Current Zoology2015，61，1： | 1 |
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