EXPERIMENTAL STUDY ON IDENTIFICATION OF MODAL PARAMETERS OF CABLE

High-speed cine photography technique and improved digital temporal serial image correlation method (IDTSICM) are employed to measure the modal parameters of the cable model under free vibration conditions. This technique has the advantages of being simple, whole-field, and non-contact. It also does not add additional weight and damping and can be adjusted to different ranges of frequencies and displacements. Images of the cable model are captured in real-time by high-speed CMOS camera. IDTSICM (programmed in VC++ environment) is subsequently used to obtain displacement signal automatically. In this process, wavelet analysis is preferred to identify the modal parameters including frequency and damping ratio. Experimental results agree well with the theoretical values. Test and analytic results show clear evidence of the feasibility and advantages of IDTSICM and wavelet analysis in identifying the modal parameters of the cable modal, which confirms the new proposed method for investigation on vibration behavior of cable model at the engineering spot.