Crash Safety Center 3

https://digitalcommons.kettering.edu/crash_photos/1002/thumbnail.jp

Crash Safety Center 5

https://digitalcommons.kettering.edu/crash_photos/1004/thumbnail.jp

Analysis of Shielding Effectiveness against Electromagnetic Interference (EMI) for Metal-Coated Polymeric Materials

Lightweight materials, such as polymers and composites, are increasingly used in the automotive and aerospace industries. Recently, there has been an increase in the use of these materials, especially in electric vehicles. However, these materials cannot shield sensitive electronics from electromagnetic interference (EMI). The current work investigates the EMI performance of these lightweight materials using an experimental setup based on the ASTM D4935-99 standard and EMI simulation using the ANSYS HFSS. This work studies how metal coating from zinc and aluminum bronze can improve the shielding performance of polymer-based materials, such as polyphenylene sulfide (PPS), polyetheretherketone (PEEK), and polyphthalamide (PPA). Based on the findings of this study, a thin coating (50 μm) of Zn on the surface of PPS and a thin coating of 5 μm and 10 μm of Al-Bronze, respectively, on the surface of PEEK and PPA have indicated an increase in the shielding effectiveness (SE) when subjected to EMI. The shielding effectiveness significantly increased from 7 dB for the uncoated polymer to approximately 40 dB at low frequencies and up to approximately 60 dB at high frequencies for coated polymers. Finally, various approaches are recommended for improving the SE of polymeric materials under the influence of EMI

Phase Shift Control Based Active Balancing Battery Management System

The use of electric power systems in the industrial field is continuously expanding due to the development and progress of new energy technology. As one of the core technologies of power systems, people are increasingly demanding higher performance from batteries. The battery management system plays an essential role in improving efficiency, safety and life-span of the battery pack and one of its main functions is the battery balancing function. This paper aims to discuss a novel battery balancing method using dual active bridge phase shift control technique. This technique has a much simpler circuit structure, reduced manufacturing cost, requires less space and offers more flexible control of balancing current than the current mainstream battery balancing methods