Application of dispersion entropy to journal bearing hydrodynamic stability

The article consists of two parts: analytical and experimental. The first part discusses the theory of signal analysis in nonlinear systems, particularly in the context of sliding bearings. The second part describes an experiment where a mechanical system achieves stable operation. Three types of signals reflecting different states of bearing operation are identified: unstable, transient and stable operation. The study showed that the value of DisEn (indicator) is related to the operating state of the bearing. This allows easier diagnosis of the bearing's condition and suggests the possibility of dispensing with a single sensor. In addition, a decrease in the difference between DisEn values for the x and y axes was noted in unstable operation.