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Thermal analysis of the industrial shoe brakes to reduce the risk of failure during braking

Ungureanu Miorita, Ungureanu Nicolae Stelian, Cosma Marius

Archives of Mining Sciences

2020

Vol. 65, no. 1

35--46

The aim of the study was to develop an assessment methodology for the temperature of the surfach of the friction pair during the braking for mine hoists. During the braking process, the work of friction is transformed into heat at the level of friction surfaces, and in case high temperatures are reached, the friction coefficient is influenced negatively, thus the risk of braking failure exists. In the first part of the study we measured the temperature of the friction surfaces for a particular case of hoist in real braking conditions. In the second part of the study is presented a theoretical model for the calculation of the temperatures resulted in the braking process for the hoist equipped with shoe brakes. The theoretical model for calculation was simulated numerically for a particular case in real braking conditions. Based on the conclusions resulted after the study, a series of hypotheses and recommendations for adjusting the control of the process parameters have been given out, in order to avoid the excessive heating of the brakes of the hoists and, respectively, their improved safety, maintenance and availability.

Comparative Studies of Roughness of the Frictional Elements of Bicycle Braking System

Dudziak M., Waluś K. J., Kędziora K., Lewandowski A.

Machine Dynamics Research

2011

Vol. 35, No. 3

5-12

The paper presents the comparative analysis of contact roughness between friction surfaces of brake pads, which were fastened to the bicycle frame, and friction surfaces of the element of the wheel rim. The following temporary hypothesis was formulated: on the basis of the measured geometry of the surface irregularities of the elements, it is possible to determine which rim surface cooperated with the left and right brake pad. The proposed method of comparison of the roughness profiles of the frictional braking elements can be useful and appropriate for analyzing some types of vehicle accident reconstructions.