Determinación de la curva de densidad de probabilidades del intervalo P-F del desgaste del rodamiento 6202 y su variación en función de la carga

Abstract

This curricular integration work aimed to determine the probability density curve of the P-F interval of bearing wear 6202-2RS and its variation depending on the load. A database will be generated from the test of thirty bearings, which were subjected to five different loads (100, 150, 200, 250, 300) N, to obtain the P-F interval of each of them. Within the bearing test, the bearing damage unit (BDU) will be studied, using the tpi 9080 Smart Trend Meter vibration analyzer. The point P (potential failure) was determined, being the second value from the theoretical limit calculated in the normal operating state of the bearing. To maintain a stable range of tension in the A24 band, it was crucial to monitor its slippage. The rotation frequencies of the pulleys were measured through the laser tachometer, taking readings at intervals of ten minutes. To check the validity of the data, the Pearson R connection coefficient was applied. If the connections between the two variables were not statistically significant, the band was tensioned until the correct connections or working frequencies were found. Through the Kolmogórov-Smirnov goodness-of-fit test, which compares the Normal, Exponential and Weibull distribution, it will be defined that the probability density curve of the P-F interval of the wear of the 6202-2RS bearing best fits the Weibull distribution for each load. It is concluded that the P-F interval is not constant as a function of load, based on this. It is recommended not to relate the operating time of a bearing with its probability of failure, since it can cause severe damage to the asset.