Detection/Diagnosis of Chipped Tooth in Gears by the Novel Residual Technology

The novel residual technology is applied for the detection/diagnosis of partly-missing (chipped) tooth in a gear of the machine fault simulator (MFS) produced by SpectraQuest (USA). The automated sensor-less technique is implemented for the speed estimation. This technique estimates the speed data from raw vibration data using the narrow-band demodulation of the mesh component, providing that an approximate running speed and number of teeth are known. An advanced technique based on the likelihood ratio is used for decision making. The novel technology is compared with the conventional technique, the classical residual technology. For both technologies, the gear fault has been continuously diagnosed throughout the whole test duration without false alarms and missed detections. The use of the novel residual technology in comparison to the classical residual technology provides higher probability of the correct damage detection and faster damage diagnosis.