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To improve the reliability and service life of thrust cylindrical roller bearings (TCRBs), the effects of single/compound pit texture on tribological properties and on friction-induced vibration and noise were studied. Laser marking equipment was used to create compound pit texture on a shaft washer. A universal friction and wear test rig was used to measure the friction force, vibration acceleration, and noise signals of TCRBs. The differences between the single/composite pit-textured and non-textured surfaces were studied in terms of the friction, wear, and vibration noise properties. The results revealed that the friction force and wear loss of the single/composite pit-textured surface were markedly lower than those of the non-textured surface. Compared to non-textured surface bearings, the friction force and wear loss for textured surface bearings were reduced by 39.6 % and 59.6 %, respectively, when the diameter, depth, and area density of the pit were 300 μm, 10 μm, and 10 %, respectively. The single/composite pit-textured surface exhibited good potential for vibration absorption and noise suppression. It could effectively interfere with the self-excited vibration of the TCRBs friction pair system, thereby reducing the degree of vibration noise of the TCRBs.

In an aluminum electrolysis cell, the movement of molten aluminum is driven by electromagnetic forces resulting from the current fields in the cell. A rapid movement of the aluminum liquid results in a noisy operation of the cell with an increase in both the voltage and the energy consumption. For a long time designers have endeavored to reduce the magnetic field intensity and decrease the Lorenz force to lower the flow speed of the aluminum liquid by optimizing the layout of the bus bars. In the present work, the effect of the design and the material of the cathode on the horizontal current in aluminum liquid were studied by .