Abstract
Life styles based on mass consumption and mass abandonment, which have been made possible by mass production, need to be rethought from the viewpoints of global environmental problems and future shortages of fossil energy resources. For power equiment and power systems, the life extension of power equipment using various diagnosis techniques is an important subject. The larger in size systems become, the more serious the damage to them becomes. Therefore, more sophisticated diagnosis technologies are required. In previous paper, an estimation method for vibrations and forces inside gas insulated switchgear, which are caused by an abnormal condition was discussed. The values and locations of inside forces were estimated by solving an inverse problem of vibrations using calculations and experiments. In the calculations, up to 50 force locations were well estimated while in experiments, up to 6 force locations were. Then, when the locations of inside forces do not agree with the location used to measure the transfer function, a new estimation technique which uses two or three exciting and observing points multiple times and searches for the real location of the inside forces successively, was proposed. In this paper, the accuracy of the new estimation technique was discussed for various vibration models. In some frequency, it is difficult to obtain an accurate result. This is because a single vibration mode is dominant. Even if the dimension of the matrix is very small, such as 2 the inverse problem becomes ill-conditioned.
