Vibration mechanism analysis and algorithm optimization of contactor contact system

In order to solve the problem of vibration bounce caused by the contact between moving and stationary contacts in the process of switching on,two-degree-of-freedom motion differential equation of the contact system is established.Genetic algorithm is used to optimize the pull in process of AC contactor.The whole process of contact bounce was observed and analyzed by high-speed photography experiment.The theory and experimental results were very similar.The iron core has collided before the contact is separated,which further aggravates the contact bounce.When the iron core bounces collided again,the bounce of the contact was not affected.During the operation of the contactor,the movement of the moving iron core will cause slight vibration of the system.The contact bounce time and the maximum amplitude are reduced.The research results provide a theoretical basis for further control and reduction of contact bounce.

《道德经》修辞赏析

《道德经》善用、广用修辞,使词句准确、鲜明、生动,富有说理性和感染力,有许多精警语句常常被引用。据初步分析,《道德经》用到的修辞手法有排比、联用、矛盾、重言、警策、对比、转品、顶真、反问、设问、同异、比喻、回环、层递、反复、易色、对偶、引用、接应、互文等等,不下二十多种。其中有不少篇章同时使用了几种修辞手法,还有的是综合运用。修辞手法的丰富多重广泛娴熟的运用,使这部著作在具有深刻的哲理启示的同时,给人们带来琳琅满目,异彩纷呈的审美领略。正因为如此,这部古代哲学的经典也被看作世界文学史上的瑰宝。