Influence of triboelectric processes on friction characteristics of brake units of technological transport

Abstract

Purpose. To establish patterns of changing of friction properties at surface layers of metal-polymeric friction couples which are in the process of mechanical, thermal and electrical interactions in friction units of braking devices based on triboelectric phenomena. methodology. Experimental research studies of triboelectric processes were performed on specially created laboratory stand that simulated band-block brake of technological transport and serial universal brake test model KI-8964 which allowed exploring metal-polymeric friction couples of drum-block and disc brakes. Electric current measurement was carried out using nanoampermeter F-195, potential difference was measured using the analogue-digital converter USB Oscilloscope II. The number of experiments was enough to get results with confidence probability of 0.95. findings. As a result of research experiments on properties of metal-polymeric friction couples of braking devices in laboratory and operating conditions during triboelectric interaction the following laws of change were established: values of potential difference of friction couples "grey cast iron-polymers" of drum-block and band-block brakes with regard to surface temperatures linings and specific loadings; dynamic friction coefficient with regard to circulating heat and tribocurrents; braking torques created by individual friction units and total braking torques with regard to changing of generated tribocurrents in contact of belayed structures "metal-polymer". Originality. Scientific research studies on metal-polymeric friction couples can extend the database of triboelectric processes in braking devices. As a result of wear-friction properties research on metal-polymeric friction couples of braking devices in laboratory and operating conditions at nano-, micro-and millilevels there were established patterns of change in thermal stimulated bit currents and electric potentials in friction couple contact with regard to interaction time, surface temperature and specific loads, dynamic friction coefficients and value of braking torque generated from trybocurrents. Practical value. The results allow optimizing the management of wear-friction properties and thermal state of brake unites.

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“…The authors modernized a workbench [107,108] for conducting experimental studies. The workbench allows simulation of the operation of the belt brake of the drilling drawworks (Figure 1).…”

Design and analysis of electric power-assisted steering in vehicles for mountain forests

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