This work presents two criteria for the optimal positioning of strain sensors on a cantilever thin plate, which has bending and torsional modes. The aim is to find an efficient placement of strain sensors in order to maximize the observability of the first N modes of vibration. To this end, we have developed two positioning criteria based on the von Mises equivalent strain, which is a unique representative value of a three-dimensional strain state. The sensors should be placed at points where this equivalent strain presents significant values for the dynamic plate behavior defined by the first N modes. Although these criteria are general and can be applied to any strain sensor, we intend to use fiber grating sensors as strain gauges taking advantage of their inherent characteristics in comparison with other sensors.

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