Orthogonal Maximum Sequence Sensor Placements Algorithms for modal tests, expansion and visibility

After discussing standard requirements on sensor configuration and addressing the issue of non triaxial measurements, the paper introduces a new class of sensor placement algorithms that locate sensors at the maximum response position of an orthogonal sequence of vectors. The methodology is first applied to target modes and provides similar results to standard placement algorithms at a fraction of the numerical cost. Fixed sensor modes are then defined and shown to provide an efficient mechanism to validate a given placement and place additional sensors. A placement strategy to detect modeshape changes is finally proposed to enhance the visibility of selected model parameters.