Development project of an ultrasound densitometer for non-destructive testing on wood
Name: ROMARIO ALVES CARVALHO
Publication date: 26/05/2022
Advisor:
Name |
Role |
|---|---|
| GILSON FERNANDES DA SILVA | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| GILSON FERNANDES DA SILVA | Advisor * |
| JOÃO GABRIEL MISSIA DA SILVA | External Examiner * |
| PEDRO GUTEMBERG DE ALCÂNTARA SEGUNDINHO | Internal Examiner * |
Summary: There are few adequate techniques to determine wood density in the field. The non-destructive test of ultrasonic wave propagation has the potential to predict the properties of wood if the variables of this process are known. This research aims to develop a densitometer to estimate the basic wood density using the principle of the propagation velocity of ultrasonic waves. Two equipment prototypes were designed and assembled, one version without an amplifier and the other amplified. The ultrasonic wave propagation velocities were determined using the equipment prototypes for six species of eucalyptus. The propagation of ultrasonic waves was carried out with the James V-Meter IV to validate the densitometer. To estimate wood density by mathematical modeling propagation of longitudinal waves was necessary to determine the longitudinal modulus of elasticity, the basic and Poisson ratio of the samples. The Prototype I underestimated the ultrasound propagation speed in wood and the Prototype II made accurate measurements. Prototype II using the three-dimensional modeling of wave propagation in wood was the one that obtained the best density estimation, with RMSE of 8.94% and bias of 1.66%. The estimation of the basic density by the equipment obtained good precision, being similar to the resistography technique.
Keywords: Wood density, non-destructive testing, ultrasound, densitometer.
