However, the signal frequency at overspeed of an asymmetrical gear must be computed more carefully. For example, Figure 8 shows two transducer signals at slow roll. The asymmetrical-geometry gears being observed both have large teeth and small spaces. Gear 2 has slightly larger teeth and slightly smaller spaces than gear 1. However, these signals will not behave the same at high speeds.
Frequency is a function of how much the signal is changing over time.
Over the full period both signals change the same amount. Vdc in less time than signal 1. Therefore, over this portion of the waveform, signal 2 changes more over time . At high speeds signal 2 will attenuate more than signal 1. In order to deal with the problem of calculating the signal frequency, two equations are suggested.