抄録
This paper proposes an innovative vibration testing method for membrane structures based on impulse response excited by laser. Non-contact impulse force can be applied to a structure by using a shock wave generated by laser-induced breakdown in air. A high-power YAG pulse laser is used in the present vibration testing system for generating the laser-induced breakdown in acoustic fields. The laser excitation makes a precise measurement of the frequency response in wide frequency range possible because an ideal impulse force is applied to a point on the structure. Using a laser Doppler vibrometer to detect a response of the structure, both non-contact laser excitation and measurement are achieved in the vibration testing system. Furthermore, vibration mode shapes of the membrane structure can be extracted by conducting a multi-point measurement. The validity of the present vibration testing system is verified by measuring the frequency response data and extracting the mode shapes of a square Kapton membrane structure.
