Abstract
This paper presents design method of a spatial filter for suppressing modal observation spill over and the measures of modal observability is introduced as criteria for designing the optimal filter in an engineering sense. In the spatial filter design by using multiple sensors, sensor positions including sensor's position error are obtained by using the measure of modal observability. The workability of the measure of modal observability is investigated by experimental application to a cantilever beam. The validity of the adjusting of optimal sensor position is carried out by the measures of modal observability. Health monitoring of the structure based on the spatial filter is investigated in vibration testing.
