Fig. 1. Type of porcelain insulator damage: (a) normal, (b) cap damage, and (c) porcelain damage.
Fig. 2. Experimental set-up for frequency response function measurement of porcelain insulator.
Fig. 3. FRF results by five experimental values and average value.
Fig. 4. FRF results according to impact and sensor position.
Fig. 5. Accelerometer placement at various positions for FRF measurement.
Fig. 6. FRF results according to position of sensors.
Fig. 7. FRF results by damage type of porcelain insulator.
Fig. 8. Damping raito of FRF curve shape by damage type.
Fig. 9. Nyquist diagram by porcelain insulator damage type.
Fig. 10. Nyquist diagram by porcelain insulator damage type.
Table 1. Type by impact hammer and sensor position.
Table 2. Experimental values of natural frequency by frequency response function.