... acquisition system was used to collect and analyze the experimental data of electrical contact resistance (ECR) and friction torque (T f ). Fractal theory was used to deal with the signals of the above two parameters simultaneously. The fractal dimension (D s ) and topothesy (G) of the signals were used...

...Jeng Luen Liou; Jen Fin Lin Instead of a general consideration of the fractal dimension ( D ) and the topothesy ( G * ) as two invariants in the fractal analysis of surface asperities, these two roughness parameters in the present study are varied by changing the mean separation ( d * ) of two...