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This paper introduces an experimental study on sub-harmonic friction excitations and rotor squeals. Experiments confirm that low-frequency friction excitation can trigger a stationary rotor to squeal at much higher frequency (either at or near a rotor natural frequency). The resulting squeal frequency is always a harmonic of the low-frequency excitation. Multiple squeal frequencies can also be excited at the same time, by a single sub-harmonic friction excitation. Those frequencies, when co-existing, also satisfy harmonic relationships (either harmonic or ultra-subharmonic) amongst themselves.

As automotive manufacturing increases in China, boosting the sales of OEM and aftermarket brake system components, it becomes increasingly important to address customer and manufacturer concerns regarding the implementation of localized testing. In response to the growing demand to understand noise and component wear characteristics, research to assess representative city traffic patterns in the city and suburbs of Shanghai/Suzhou, China has been conducted. With this data, a procedure for operating a city traffic vehicle test in China has been developed and documented in this paper. This testing process provides data that quantifies lining and rotor wear, brake energy levels, lining temperatures, component NVH, and other brake system qualities.