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弧型扭变叶片3D建模与型线密度的研究 被引量:1
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作者 李绍珍 张玉伟 《机械设计》 CSCD 北大核心 2004年第10期57-59,共3页
以工程曲面、计算机图形学为理论基础 ,针对弧型扭变叶片由二维设计到三维构形影射的对应关系 ,提出了一种新的数学建模方法 ,有效地解决了扭变曲面叶片在三维构造方面的难题。同时针对扭变叶片构造的光顺及确保展开的精度问题 ,研究了... 以工程曲面、计算机图形学为理论基础 ,针对弧型扭变叶片由二维设计到三维构形影射的对应关系 ,提出了一种新的数学建模方法 ,有效地解决了扭变曲面叶片在三维构造方面的难题。同时针对扭变叶片构造的光顺及确保展开的精度问题 ,研究了如何增加各截面间型线密度的算法 ,经证明 ,该算法准确、可靠 ,进而为各种复杂扭变叶片的设计、制造提供了数学支持。 展开更多
关键词 扭变 叶片 线 光顺 3D建模 CAD 风机 型线密度
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Analysis of Electromagnetic Exposure in Wireless Power Transfer System for Endoscopic Micro-robot
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作者 YE Dong-dong YAN Guo-zheng LI Jia-jun WANG Kun-dong MA Guan-ying 《Chinese Journal of Biomedical Engineering(English Edition)》 2008年第2期47-53,60,共8页
A wireless power transfer system for endoscopic micro-robot operating at 36 kHz is presented in this paper. The issue of patient' s health and safety regarding exposure to the electromagnetic field is addressed. The ... A wireless power transfer system for endoscopic micro-robot operating at 36 kHz is presented in this paper. The issue of patient' s health and safety regarding exposure to the electromagnetic field is addressed. The specific absorption rate and current density can be used to investigate the electromagnetic influences on the biological tissues surrounded by the wireless power launching coil. In view of this purpose, the limited close-ound solenoid electromagnetic model is built, the relationship between the electric intensity and the specific absorption rate and current density is deduced, and the simulation experiments are done. Experimental results show that the values of SAR and current density related to different tissue catalogs are all very small and do not exceed their own limits respectively when the resonance frequency of operation is 36 kHz. 展开更多
关键词 wireless power transfer endoscopic micro-robot specific absorptionrate current density SOLENOID
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Global attractivity of asymptotically almost periodic Nicholson's blowflies models with a nonlinear density-dependent mortality term
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作者 Yi Tang Shenglan Xie 《International Journal of Biomathematics》 SCIE 2018年第6期77-91,共15页
This paper focuses on the study of a class of asymptotically almost periodic Nicholson's blowflies models with a nonlinear density-dependent mortality term. By virtue of differ-ential inequality techniques, a set of ... This paper focuses on the study of a class of asymptotically almost periodic Nicholson's blowflies models with a nonlinear density-dependent mortality term. By virtue of differ-ential inequality techniques, a set of easily verifiable sufficient conditions are established to show that every solution of the considered model is asymptotically almost periodic, and it also converges to a same almost periodic function as t →+∞ , which improves and supplements some previously known researches. Moreover, a numerical example is given to test the feasibility and effectiveness of the obtained results. 展开更多
关键词 Nicholson's blowflies model nonlinear density-dependent mortality asymp-totically almost periodic solution convergence.
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