The influences of three different search algorithms

i. e.:direct search method

step accumulating method and step eliminating method

on the effective independent method were discussed with respect to the optimized measurement positions for modal test.An aero-engine component was taken as an example to demonstrate the application of the approach.The optimized measurement positions selected by these three search algorithms for the effective independent method were analyzed comparatively with respect to modal correlation

kinetic energy of each mode contributed to the measured positions and the Fisher information matrix.The results indicate that the step eliminating method can most effectively achieve the goal of the effective independent method by increasing the spatial resolution of the target mode shapes.