모드 밸런싱 기법을 이용한 유연 로터의 밸런싱 기법 연구 = Balancing Flexible Rotors Using Mode Balancing Techniques

다국어 초록 (Multilingual Abstract)

With the growing demand for high-speed and lightweight rotating machinery, effective vibration control has emerged as a crucial factor in ensuring operational stability and longevity. Unbalanced mass remains one of the primary sources of rotor vibration, often resulting in performance deterioration and premature failure of critical components such as bearings and seals. While traditional balancing techniques designed for rigid rotors are effective at low speeds, they are inadequate for flexible rotors, which operate across multiple critical speeds and thus experience complex vibration patterns. This study focuses on the application and verification of mode balancing as a field balancing technique for flexible rotors. A finite element rotor model, consisting of three disks supported by two bearings, is developed to simulate dynamic behavior and validate the balancing method. Two approaches are examined: a response-based mode balancing method using analytical mode shapes and a trial mass-based method. Results show that both methods successfully reduce vibrations at the corresponding critical speeds, with minimal interference between modes. Notably, the trial mass-based method exhibits superior performance, likely because it can account for modeling inaccuracies and damping effects in real systems. These findings demonstrate that mode balancing, particularly with trial masses, represents a practical and effective technique for field applications in high-speed flexible rotor systems.