| 摘要 |
PURPOSE:To quicken the operation by determining the dipole moment of each particle based on the electromagnetic field caused by other than particles at the time of first processing whereas determining the electromagnetic field caused by other particles at the time of following processings and then determining the dipole moment of each particle based on the electromagnetic field caused by other than particles. CONSTITUTION:A magnetic dipole is subjected, in a magnetic field, to moments F , T in the translating direction and rotational direction as shown by formulas (In the formula, m represents the dipole moment of a particle and B represents the flux density a the particle position). The j-th particle among nB pieces of particles has the dipole moment m, shown by formula II (a: diameter of particle, mu0: permeabi.1ity in the vacuum, mu: relative permeability of particle, Bj : flux density at particle position). The density Bj is assumed according to formula III (Bj', : flux density caused by other than particles, BKj : flux density at the position of j-th particle caused by k-th particle). The density B'j is calculated from a data stored in a memory by finite element method. When the moment I is determined according to formula II, B'j is used as the density Bj in the first calculation and Bj in the formula III is employed in the following calculations thus quickening the calculation. |
