Application of an Ultrasound-based Instrument to Evaluate Condition of Drywood Termite Infested Timber Components
S Fauziyyah, L Karlinasari, D Nandika, R Wimmer
The characteristics of ultrasound waves propagation from non-destructive ultrasound-based instrument on drywood termite infested wooden components were investigated. Features of wave propagation such as time-of-flight, velocity, and peak energy on three orthogonal wooden plane (longitudinal, radial, and transversal) were studied. The wooden components used on this study came from a traditional wooden house in Pandeglang Regency, Banten Province. The basic macroscopic characteristics of wooden component were noted including fundamental physical and mechanical properties such as density, specific gravity, and dynamic MOR. SylvatestDuo was utilized to evaluate the current state of the wooden component through ultrasound wave propagation means. The wave propagation features (time-of-flight and velocity) were then translated to reconstruct residual wooden component condition via three-dimensional model. The study showed that ultrasound waves travelled at different time and velocity in the three orthogonal plane, the longitudinal plane has the highest velocity and the shortest travel period among other planes as well as highest R-squared (0.98) in the relation of time to span regression result. There were more than 50% of the wooden component were estimated to degrade due to drywood termite infestation based on the three-dimensional image reconstruction produced from the characterization of the ultrasound waves assessment results.
Keywords: acoustic-based assessment, drywood termite, material evaluation, wooden component