Wind-Induced Coupling Vibration Effects of High-Voltage Transmission Tower-Line Systems

Figure 4

Vibration modes of the transmission tower-line system.

(a) The 1st-order vibration mode in the tower-line system in the -direction (the 16th-order,  Hz)

(b) The 1st-order vibration mode in the tower-line system in the torsion direction (the 17th-order,  Hz)

(c) The 2nd-order vibration mode in the tower-line system in the torsion direction (the 19th-order,  Hz)

(d) The 3rd-order vibration mode in the tower-line system in the torsion direction (the 40th-order,  Hz)

(e) The 1st-order vibration mode in the tower-line system in the -direction (the 112th-order,  Hz)

(f) The 2nd-order vibration mode in the tower-line system in the -direction (the 119th-order,  Hz)

(g) The 2nd-order vibration mode in the tower-line system in the -direction (the 120th-order,  Hz)

(h) The 3rd-order vibration mode in the tower-line system in the -direction (the 128th-order,  Hz)

(i) The 4th-order vibration mode in the tower-line system in the torsion direction (the 161st-order,  Hz)