The dissertation investigates a new degree of freedom to influence friction by developing an adaptive friction lining whose friction is actively influenced by the use of the piezoelectric actuators, primarily by changing or combining different material pairings during operation. A tribologically selectively influenceable friction system enables operation with low friction power and low wear for a wider range of applications by adjusting the tribological properties or friction in response to changes in operating conditions (e.g. sliding speed, temperature) by means of closed-loop control. In dry-running tribosystems, a drop in the coefficient of friction occurs for some friction materials at constant normal force with increasing sliding speed. This drop is often undesirable because, for example, it can lead to frictional vibrations of the overall system or to a reduction in the effectiveness of brakes or clutches. A major motivation of this research is the endeavor to keep the coefficient of friction of the dry-running friction lining constant or increase it with increasing sliding speed by bringing various different friction materials individually or together into contact with the mating body. Friction linings with adaptive components whose properties can be specifically modified open up a wide range of applications in diverse areas of mechanical engineering.
Zhenwei Miao
Steuerbares Reibverhalten trockenlaufender Tribosysteme
Springer (2023) [Link]