Vibration of Dynamic Systems Under Cyclostationary Excitations

This paper proposes a new method for calculating the response of structural systems subjected to a special type of nonstationary, random excitation, called cyclostationary. The main characteristic of this type of excitation is that its statistical properties (e.g., the RMS) vary periodically in time in contrast to a traditional, random stationary model, which assumes constant statistical properties. Systems like a submarine propeller, a turbine blade and an internal combustion engine are subjected to this type of excitation. The paper presents a method for modeling the excitation and for calculating the response of such systems. It demonstrates that a cyclostationary model yields considerably more accurate estimates of the RMS of the response of a vehicle driven on rough pavement compared to a traditional stationary model.