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The Vibration Characteristics of Gofasa Wood (vitex cofassus)


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DOI: https://doi.org/10.15866/ireme.v11i9.11636

Abstract


The determination of the vibration characteristics of Gofasa wood (vitexcofassus) can be carried out through bending tests, compression tests, and excitation tests. The beams used for the excitation test were fixed with the unsupported ends. Four measurement points were determined on the radial and tangential direction of the grain of the wood to obtain the vibration parameter values. The measurement points were subjected to movements in order to obtain the vibration transmission characteristics. The analysis was carried out by using the non-destructive evaluation method (impact test), and to obtain the Poisson ratio;a mechanical test was carried out, by using polynomial regression. The obtained results showed that the dynamic stiffness value of the tangential direction of the grain was higherthan the radialdirection of the grain kT>kR.The Poisson ratio of the grain radial direction had a higher value, and the natural frequency of thegrain radial direction showed a difference of 1 Hz, higher than the tangential direction of the grain.This research is to demonstrate that the vibration transmission characteristics have a damping ratio value less than √2. The transmission ratio TR<1 which means that the system requires damping.
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Keywords


Vibration Characteristic; Vibration Parameter; Vibration Transmission

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