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关于密码体制中正形置换的几个结果 被引量:4
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作者 朱华安 谢端强 《应用科学学报》 CAS CSCD 2004年第2期132-135,共4页
正形置换有很好的密码特性,文中论述了关于正形置换的几个结果,所得结果对正形置换的构造具有一定的意义.
关键词 密码体制 正形置换 线结构 差分均匀性 平衡函数 分组密码 保密通信系统
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Investigation of a Design Modification for Double Helical Gears Reducing Vibration and Noise 被引量:6
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作者 王成 方宗德 贾海涛 《Journal of Marine Science and Application》 2010年第1期81-86,共6页
To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge,... To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge, substituting three segment parabolas for the line. The influence of longitudinal tooth modifications on tooth surface load distributions was discussed. Transmission error minimization and uniformity of tooth surface load distribution were chosen as optimization goals and the modified parameters were obtained by applying the complex method. Finally, an experiment comparing the loaded transmission error, vibration, and noise both before and after modifications was carried out. The results indicate that the modified design is reliable. 展开更多
关键词 tooth profile modification tooth longitudinal modification double helical gears loaded transmission error
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