A group of leaf springs which provides the flexible support of stator is designed to satisfy the requirement of low vibration motor at megawatt （MW） level. Spring steel 65Mn is chosen as the material of the leaf spr...A group of leaf springs which provides the flexible support of stator is designed to satisfy the requirement of low vibration motor at megawatt （MW） level. Spring steel 65Mn is chosen as the material of the leaf spring. The size of the leaf spring is obtained by calculation and load analysis according to a deflection formula. The deflection and stiffness of the single leaf spring is calculated with both theoretical method and finite element analysis （FEA）. A deflection test platform is established based on actual force and boundary condition to verify the deflection and stiffness of the leaf spring. The results show that the maximal deflection of the three pieces of 1.2 mm leaf spring group is 0.71 mm and the stiffness of the leaf spring group is 364 N/mm, which satisfies the requirements of the motor. The design method is also applicable for other MW power level motors.展开更多
文摘采用离子束辅助沉积(ion beam-assisted deposition,IBAD)技术在非织构的金属基带上沉积双轴织构的MgO薄膜,研究了不同Ar^(+)离子束流能量对MgO双轴织构和表面形貌的影响.结果表明:在700∼1000 eV离子能量范围内,MgO薄膜的双轴织构随离子能量的增加而改善;在1000 eV离子能量下,IBAD-MgO薄膜的面内半高全宽(full-width at half-maximum,FWHM)∆_(ϕ)和面外FWHM∆ω分别为6°和2°;随着离子能量的增加,MgO薄膜的表面形貌并无明显区别,其表面粗糙度(5µm×5µm)均方根(root mean square,RMS)均在5∼6 nm.该研究证明了较高的Ar^(+)离子束能量可以提高IBAD-MgO薄膜的织构质量,对于双轴织构薄膜的稳定制备具有重要意义.
文摘在互联网飞速发展的今天,人们从网络中获得健康信息和利用这些信息保持自己健康的技能——电子健康素养,已逐渐成为人们关注的焦点。文章阐述了电子健康素养的内涵,常用的3个电子健康素养的测评工具——电子健康素养量表(eHealth Literacy Scale,eHEALS)、高校学生电子媒介健康素养量表(eHealth Literacy Scale for College Students)、电子健康素养问卷(eHealth Literacy Questionnaire,eHLQ);从2个方面介绍了护生电子健康素养现状的文献研究:护生电子健康素养的影响因素、电子健康素养对护生产生的积极影响。最后,文章结合现状提出建议:国家提高互联网准入门槛并督促各网络平台加强健康内容的审核;政府加强基础网络服务设施建设,确保网络的覆盖率;学校将电子健康知识纳入护理课程以帮助学生获取和评估健康知识等。
基金Supported by the Development and Application Research of Marine Electric Propulsion System of the Ministry of Science and Technology(2012BAG03B01)the National Natural Science Foundation of China(51205292)
文摘A group of leaf springs which provides the flexible support of stator is designed to satisfy the requirement of low vibration motor at megawatt （MW） level. Spring steel 65Mn is chosen as the material of the leaf spring. The size of the leaf spring is obtained by calculation and load analysis according to a deflection formula. The deflection and stiffness of the single leaf spring is calculated with both theoretical method and finite element analysis （FEA）. A deflection test platform is established based on actual force and boundary condition to verify the deflection and stiffness of the leaf spring. The results show that the maximal deflection of the three pieces of 1.2 mm leaf spring group is 0.71 mm and the stiffness of the leaf spring group is 364 N/mm, which satisfies the requirements of the motor. The design method is also applicable for other MW power level motors.
