Abstract
To properly evaluate the tensioning effect for a circular sawblade, it is essential to use the change in natural frequencies of the roll tensioned sawblade. We present a spatial filtering technique called the modal filter to easily measure the natural frequencies for only the modes necessary for the evaluation of the tensioning effect. The information on disk nodal diameters allows to easily design the modal filter for disk. The examples show that the natural frequencies for the modes with nodal diameters 0, 1 and 2 are necessary for the evaluation. In addition, the modal filter designed extracts the three modes necessary separately.
