Fig. 1. Experimental setup diagram of distributed fiber-optic vibration sensing system

Fig. 2. Sudden search based on Metropolis criterion

Fig. 3. Flow chart of algorithm

Fig. 4. Experimental scenarios for data collection

Fig. 5. Time domain curves of different vibration events

Fig. 6. The relationship between the fitness values and iteration times (or thresholds) of feature subsets selected by different methods in shearing and hammering datasets

Fig. 7. The relationship between the fitness values and iteration times (or thresholds) of feature subsets selected by different methods in shaking and climbing datasets

Fig. 8. The maximum fitness value of different feature numbers in the dataset of shear and rod tapping