Abstract
This paper describes the effect of the number of sensors for mode identification. Sensor locations are selected with a method using sign patterns of target modes. To evaluate selected sensor locations, a conventional method uses the ratio of the maximum singular value and the minimum one (SV ratio) of a modal matrix reduced to degrees of freedom of sensor locations because the ratio is one when target modes are orthogonal. In the conventional method, SV ratio decreases by increase in the number of sensors. This is why the conventional method does not consider relation between the number of target modes and that of sensors. In this paper, a new method to evaluate sensor locations is presented. Numerical results show that the proposed method accurately identifies target modes by increasing the number of sensors from the aspect of mode orthogonality.
