VIBRATION MODELLING OF CANTILEVER BEAM SYSTEM WITH RECIPROCATING MASSES EXCITATION SOURCE

• Main Author: Ardhi, Fauzanul
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85363
• Institution: Institut Teknologi Bandung

Vibration-based machine maintenance is one type of predictive maintenance that can be performed to reciprocating machine. Reciprocating machine generates vibration forces and moments that do not consist of only one frequency therefore vibration with a reciprocating excitation source need to be modelled to understand the vibration characteristic generated by reciprocating masses. Hence this research was conducted to perform vibration modelling of cantilever beam system with reciprocating masses as excitation source. This research began with measuring the physical parameter of experiment set-up that consist of reciprocating masses supported by cantilever beam. The measurement results were then used to calculate teoritical forces and moments as well as to model the natural frequencies. The natural frequency modelling results were then used to model the FRF magnitude curve. The FRF magnitude curve models were then compared with the FRF measurement results. This research was then continued with modelling the vibration spectrum of the cantilever rod system with an reciprocating masses excitation source to be compared with vibration measurement results under operating condition. This research found that the theoretical vibration forces and moments spectrum had two peaks at 1XRPM and 2XRPM frequencies. Additionally, the natural frequency models indicated that the cantilever beam had natural frequencies with mode shapes due to bending and torsion. The natural frequency models had a maximum relative error of 9.1% compared to the measurement results. However, the FRF magnitude curve models and the vibration spectrum still had a very large error compared to the measurement results.