Minor damage to a single gear tooth is classically a very difficult defect to detect using conventional analysis. We developed our own "knock" detection algorithm that provides the basis for a very sensitive production test system.
An automotive gearbox assembly line was fitted with our gear “knock” detection system in parallel with a vision gear-mark test. This uses our algorithm that has been designed to be auto-calibrating with a very high immunity to other vibration sources. This makes it a very reliable test for minor single tooth imperfections (usually introduced on the “green” gear) that can cause an audible problem once installed in the vehicle.