The development of products, in which carbon fiber-reinforced plastics with higher electrical resistivity than metals, has been progressing in recent years. They used extensively and require the design of groundlines to reduce electromagnetic effects caused by disturbances such as lightning. Therefore, Mitsubishi Heavy Industries, Ltd. has developed an analytical evaluation technology to reduce the electromagnetic effects of groundlines in composite structures. The developed analytical evaluation technology for groundline structures divides the target frequency range into two and utilizes two complementary methods corresponding to them: quasi-static electromagnetic field analysis plus circuit analysis (low frequency range) and electromagnetic field analysis based on the FDTD method (high frequency range). We performed the evaluation of the measures to secure current paths and against the effects of induced magnetic fields and the evaluation of the effects of interference between power sources sharing groundlines, and confirmed the validity of the analytical evaluation technology through test and analysis using a mock-up.
