Validation of the FEM bracket model: (a) Point mobility response functions measured at a corner position of three samples of the same bracket model (in gray). The mobility function, averaged among the three samples, is represented in black. Abscissas of the circled peaks identify the eigenfrequencies of the bracket. (b) Measured mode shapes of the bracket and corresponding eigenfrequencies. (c) FEM mode shapes of the bracket and corresponding eigenfrequencies. (d) Percentage error between FEM and experimental eigenfrequencies.