Rotor systems operating under harsh conditions, such as high-speed rotation, long-term operation, and alternating loads, are susceptible to crack faults that pose a threat to operational stability. The vibration resulting from crack faults in rotor systems reflect the abnormal process of energy transmission from the external driving point through the shaft. Therefore, employing the vibration power flow method, this study investigates elastically supported cantilevered rotors under the influence of crack faults to reveal the underlying energy characteristics. Furthermore, examining vibrational energy variations in cracked rotor systems within high-speed regions during nonlinear bifurcation reveals that energy curves oscillate during quasi-periodic and multi-periodic transitions.