Avaliação de incerteza em medições baseadas em imagem para caracterização do pitting na superfície de dentes de engrenagens

Abstract

This work presents a study on obtaining an estimate of uncertainty, referring to the dimensioning process through the analysis of photographic images of the area damaged by the wear mechanism called pitting, located on the flank of gear teeth. The work intends to demonstrate a format that can define an uncertainty estimate for processes, whose steps and measurements are similar to the characteristics presented in the course of this work. To obtain the uncertainty estimate, a process similar to that of calibration was used, where the reference measurements were artificially constructed in the gear used as the object of study. Subsequently, the reference measurements were estimated through the measurement process using equipment calibrated and operated by a trained professional. After obtaining the reference estimate, eleven measurements of the same measurement were performed, but through photographic image analysis, obtained by an image capture system and later measured via CAD SOLIDWORKS software. To obtain the uncertainty estimate, it was defined that the calculation of the precision of the photographic image analysis process by means of software would provide satisfactory results. The measurement uncertainty value was 0.03mm² and the trend regarding the systematic error was 0.80mm². The obtained results allow the evaluator to select the measurement system based on photographic images for applications where the confidence interval is compatible with the obtained uncertainty estimate.