Walter Bartelmus

TL;DR: Bartelmus et al. as mentioned in this paper introduced a new diagnostic feature, which can be used for monitoring the condition of planetary gearboxes in time-variable operating conditions, which exploits the fact that a bad condition is more susceptible (yielding) to load than the gearbox in good condition.

TL;DR: In this paper, it is shown that the most important factor of the proper planetary gearbox condition is connected with perturbation of arm rotation, where an arm rotation gives rise to a specific vibration signal whose properties are depicted by a short-time Fourier transform and Wigner-Ville distribution presented as a time-frequency map.

TL;DR: In this article, the results of computer simulations and results obtained by laboratory rigs and field practice are compared, and different factors are taken into consideration: design factors, production technology factors, operational factors and change of condition factors.

TL;DR: In this paper, a diagnostic approach is proposed for bearing used in wind turbines, which uses parameters obtained from commercial diagnostic system (peak-to-peak and root mean square (RMS) of vibration acceleration, and generator power that is related to the operating conditions).

TL;DR: In this paper, two models of gearboxes (a fixed-axis two-stage gearbox and a planetary gearbox) operating under varying load conditions are proposed, and an original transmission error function expressing changes in technical condition and load variation is presented.