Kan Okubo

Analysis of an Electromagnetic Field Created by Line Current Using Constrained Interpolation Profile Method

Development of accurate schemes is a technical issue related to calculation of electromagnetic fields. This study uses constrained interpolation profile (CIP) method to analyze electromagnetic fields created by line current. This is a novel method proposed by Yabe. Comparison of results obtained using finite difference time domain (FDTD) analysis and CIP analysis indicates that CIP analysis provides higher accuracy using identical discretization. In addition, given the same level of accuracy, CIP analysis requires less memory and less calculation time

Consideration of the Boundary Condition between Two Media in Acoustic Field Analysis Using the Constrained Interpolation Profile (CIP) Method

This study examines treatment of a boundary between media to simulate an acoustic field using the CIP method. The handling of spatial derivatives of fields is extremely important for CIP acoustic field analysis. We demonstrate a method of handling this boundary and report results of CIP acoustic field analysis using the present treatment.

Consideration of Treatment of the Boundary Between Different Media in Electromagnetic Field Analysis Using the Constrained Interpolation Profile Method

The treatment of a boundary between different media to simulate an electromagnetic (EM) field is examined using the constrained interpolation profile (CIP) method. Consideration of the way of handling spatial derivatives of fields is very important for CIP-EM field analysis. We demonstrate a method of handling this boundary and report results of CIP-EM field analysis using the present approach

Electrostatic Field Variation in the Atmosphere Induced by Earth Potential Difference Variation During Seismic Wave Propagation

To clarify the relationship between earthquakes and electrical phenomena, signals of three parameters were observed continuously at Sennan in Akita Prefecture, Japan: ground acceleration (GAC), earth potential difference (EPD), and electrostatic field in the atmosphere (EFA). A large metal plate was used as an electrostatic antenna to observe EFA variation. For this paper, we used the digital natural observation (D-NOB) method as a signal processing technique and found clear EPD and EFA waveforms during seismic wave propagation. Our observation and examination results show that GAC causes EPD variation. Subsequently, the EPD variation induces EFA variation

Two-Dimensional Numerical Analysis Of Acoustic Field Using The Constrained Interpolation Profile Method

The authors investigated acoustic field analysis using the Constrained Interpolation Profile (CIP) Method. This study examined the calculation accuracy of the two-dimensional (2-D) acoustic field analysis using the Type-M CIP Method. The results obtained using finite difference time domain (FDTD) analysis and CIP analysis are compared for two-dimensional acoustic fields. The comparison revealed that CIP analysis provides higher accuracy using the same discretization.