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5. Analysis and Design of a High Force Low Torque Ratio Magnetic Field Modulation Screw

Author

Ling, Zhijian, Meng, Shunji, Zhao, Wenxiang, Ji, Jinghua, and Xu, Meimei

Abstract

This article proposes a magnetic field modulated screw (MFMS), which exhibits high force low torque transmission ratio. Essentially, the proposed MFMS requires less torque to generate a significant thrust force. The “force per torque” ratio is 1.02 kN/N.m, which is 4 times higher than conventional MFMS. The proposed MFMS is analyzed based on three-dimensional (3-D) magnetic field modulation. Then, the uniform analytical expression of the “force per torque” ratio can be derived. The pole-pairs of the proposed MFMS are reasonably selected, resulting in a significant improvement in the “force per torque” ratio. Besides, a discrete analysis method is employed to analyze the circumferential and axial modulation in the MFMS. Based on this, the modulation process and performances of the proposed MFMS is analyzed and compared. Moreover, the 3-D Maxwell tensor method is first used to analyze the contribution of air-gap flux density harmonics to the torque and thrust force. Finally, the 3-D finite element method and experiments are used to validate the theoretical analysis.

Published
2024
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10. Association of Early Inflammation with Age and Asymptomatic Disease in COVID-19

Author

Xie,Chunmei, Li,Qing, Li,Linhai, Peng,Xiaohua, Ling,Zhijian, Xiao,Bin, Feng,Jingjing, Chen,Zhenhong, Chang,De, Xie,Lixin, Dela Cruz,Charles S, Sharma,Lokesh, Xie,Chunmei, Li,Qing, Li,Linhai, Peng,Xiaohua, Ling,Zhijian, Xiao,Bin, Feng,Jingjing, Chen,Zhenhong, Chang,De, Xie,Lixin, Dela Cruz,Charles S, and Sharma,Lokesh

Abstract

Chunmei Xie,1,* Qing Li,1,* Linhai Li,2,3,* Xiaohua Peng,4,5,* Zhijian Ling,1 Bin Xiao,3 Jingjing Feng,4,6 Zhenhong Chen,7 De Chang,2,8 Lixin Xie,2 Charles S Dela Cruz,4 Lokesh Sharma4 1Department of Blood Transfusion, Guangzhou 8th People’s Hospital, Guangzhou Medical University, Guangzhou, 510440, People’s Republic of China; 2College of Pulmonary and Critical Care Medicine, Chinese PLA General Hospital, Beijing, 100083, People’s Republic of China; 3Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, 510010, People’s Republic of China; 4Section of Pulmonary and Critical Care and Sleep Medicine, Department of Medicine, Yale University School of Medicine, New Haven, CT, 06520, USA; 5Department of Rehabilitation Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, People’s Republic of China; 6Department of Pulmonary and Critical Care Medicine, Shanghai Fifth People’s Hospital, Fudan University, Shanghai, 200240, People’s Republic of China; 7Department of Pulmonary and Critical Care Medicine, Secondary Medical Center, Chinese PLA General Hospital, Beijing, 100083, People’s Republic of China; 8 Department of Pulmonary and Critical Care Medicine, Third Medical Center, Chinese PLA General Hospital, Beijing, 100039, People’s Republic of China*These authors contributed equally to this workCorrespondence: Lixin Xie; De Chang Email 2464277169@qq.com; changde5501@foxmail.comBackground: Disease severity in COVID-19 ranges from asymptomatic infection to severe disease and death, especially in older subjects. The risk for severe infection and death has been reported to be 2X in those between 30 and 40 years, 3X in those between 40 and 50 years, and 4X in those between 50 and 65 years, compared to the reference group of 18– 29 years.Objective: To investigate the early changes in host immune respons

Published
2021

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