An analysis of vibration characteristics of a TC4 titanium alloy wide-chord fan blade was conducted with both modal simulation and modal test methods. Modal analysis of a fan blade model was conducted by ANSYS-APDL software. Based on the Campbell diagram and mode shapes of the blade

the bending and torsional modes were identified. Analysis of rotating velocity margin and frequency margin of various speed illustrated that both margins of the first order bending mode were over 20%

satisfying the requirement of resonance margin. Pulse impact method and random excitation method were utilized on the three-axis shake table with scanning vibrometer to analyze the response characteristics of impact and multi-axial excitations. Results showed that low-order bending mode response was high due to circumferential and axial excitations

while high-order torsional and combined mode responses were high due to radial excitations. Blade responses of different excitation points and modes were related to the mode shapes.