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metadata.revistascielo.dc.creator: Secco, Chiara Barros
Gonçalves, Raquel
Cerri, Domingos Guilherme Pelegrino
Vasques, Érica Caroline
Batista, Fernando Augusto Franco
metadata.revistascielo.dc.subject: Pequiá (Aspidosperma desmanthum), wave length, acoustic method, forest sector.
metadata.revistascielo.dc.publisher: CERNE
CERNE 5-Apr-2016
metadata.revistascielo.dc.description: This work aimed to analyze the pattern of variation in wave lengths in presence of wood holes and to develop a model capable of describing the process. To attain that end, wood pieces were used from species pequiá (Aspidosperma desmanthum), on which circular and linear artificial holes were made and gradually enlarged. Ultrasonic tests were performed using USLab equipment and 45 kHz transducers. Measurements were taken first on the intact piece and then after each stage of artificial hole enlargement. Results demonstrated that propagation velocities of ultrasonic waves are affected by presence of holes and also that reduction in velocity is caused by changes in wave path, since waves tend to deviate from empty space and travel through matter. The circular hole type had a slightly stronger influence on velocity reduction than the linear hole type. Variation in velocity as a function of increasing percentage of hollow space relative to the intact piece can be represented by a linear model.
metadata.revistascielo.dc.language: eng
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