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大型汽轮发电机定子绕组端部的振动分析 被引量:11
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作者 陈伟梁 徐博侯 黄磊 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2010年第8期1558-1561,共4页
为了研究大型汽轮发电机定子绕组端部振动可靠性,需要有效地分析和识别大型汽轮发电机定子绕组端部的椭圆模态,并根据此模态调整相应结构,提高结构稳定性.利用定子绕组的循环对称特性,推导出多重循环结构的摄动法.根据实际中影响循环对... 为了研究大型汽轮发电机定子绕组端部振动可靠性,需要有效地分析和识别大型汽轮发电机定子绕组端部的椭圆模态,并根据此模态调整相应结构,提高结构稳定性.利用定子绕组的循环对称特性,推导出多重循环结构的摄动法.根据实际中影响循环对称特性的非循环部件或者约束,选取适当的步长,加入非循环对称部分,对原循环结构逐步摄动求解,最后将摄动法求解的结果与试验结果进行比较.结果表明,将非循环部分加入到循环结构后,使用摄动法分步求解,不仅能判断摄动过程中的椭圆模态变化,还能识别并确定感兴趣的椭圆模态.定子端部其他模态亦可用此法确定. 展开更多
关键词 汽轮发电机 定子绕组端部 椭圆模态 振动分析 摄动法
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ELLIPTIC MOTIONS ON MODAL CONVERSION ULTRASONIC MOTORS 被引量:1
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作者 金家楣 张建辉 赵淳生 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2008年第4期262-265,共4页
The forming of elliptic motions on the modal conversion ultrasonic motors (MCUMs) is discussed. The principles of the modal conversion are investigated based on the coupling with the stator and the rotor, and using ... The forming of elliptic motions on the modal conversion ultrasonic motors (MCUMs) is discussed. The principles of the modal conversion are investigated based on the coupling with the stator and the rotor, and using an independent coupler. The elliptical locus observed on the longitudinal-torslonal vibration converter with oblique slits is analyzed by using vibration theory. A method for the modal conversion is proposed by using the local mode of a substructure On a main structure. The method can be used to design the modal conversion type ultrasonic motors. 展开更多
关键词 motors ultrasonic motor modal conversion elliptic motion
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Existence of Positive Solutions for a Class of Degenerate and Nondegenerate Stable Diffusion Models
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作者 张彦肖 《Chinese Quarterly Journal of Mathematics》 CSCD 2000年第3期50-56,共7页
This paper is concerned with a class of degenerate and nondegenerate stable diffusion models.By using the upper and lower solution method and Schauder fixed point principle,the author studies the existence of positive... This paper is concerned with a class of degenerate and nondegenerate stable diffusion models.By using the upper and lower solution method and Schauder fixed point principle,the author studies the existence of positive solutions for these stable_diffusion models under some conditions. 展开更多
关键词 weak upper and lower solutions elliptic system positive solution
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