Dimensional analysis of a rotor system through FRF using transfer function and finite element methods

• Published in: Journal of mechanical science and technology Vol. 34; no. 5; pp. 1863 - 1870
• Main Authors: Dewi, Dyah Kusuma, Abidin, Zainal, Budiwantoro, Bagus, Malta, Jhon
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 01.05.2020; Springer Nature B.V; 대한기계학회
• Subjects: Complexity; Control; Damping ratio; Dimensional analysis; Dynamic characteristics; Dynamical Systems; Engineering; Finite element method; Frequency response functions; Industrial and Production Engineering; Mathematical analysis; Mechanical Engineering; Military helicopters; Modelling; Original Article; Resonant frequencies; Rotors; Scaling factors; Transfer functions; Vibration; 기계공학; Rotor system; Scaling factor; Dimensional analysis; Frequency response function
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-020-0407-x

The dynamic characteristics of system, namely the damping ratio, natural frequency, and mode shape are extracted from the frequency response function (FRF). Obtaining dynamic characteristics through FRF on large rotor system is impractical owing to safety and cost. Therefore, the dimensional scale method to predict FRF on a large rotor system is proposed. The method begins by deriving the scaling factor of FRF followed by its validation using finite element (FE) and transfer function modeling. In this case, the transfer function completes the FE modeling to describe the FRF system and compensates the lack in FE modeling in dealing with complex support and shape. Assuming the damping ratio is constant, the characteristic of dimensional analysis through FRF is obtained and the complexity of the proposed method is also discussed.