• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.12
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• pp.1351-1358
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• 2014

This study numerically simulates brake squeal and validates it experimentally by using a lab-scaled brake dynamometer. The system frequencies of the disc brake are traced with respect to the brake pressure by using a modal test and FEM. Then, the squeal frequencies measured from the brake dynamometer are found to correspond to the brake system mode with the dominant displacement of the caliper and pad. Furthermore, a complex eigenvalue analysis conducted using the finite element model confirms that the caliper mode generating the rotational displacement of the pad becomes unstable owing to the negative friction-velocity slope.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.442-445
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• 2011

Concrete track on the new railway lines of the existing roads are built on high ground, or less than 400m radius of the sharp curve sectors will occur. sharp curve sectors the rail and wheel friction, stick-slip due to the band of 1,000Hz or squeal noise occurs from the increase in civil complaints about noise is a real situation. In this study, discussed in previous studies, noise measurements for each radius of concrete track and frequency analysis, followed by the radius of the curve in order to investigate vibration characteristics of urban railway sector sharp curve radius less than 400m and 400m ~ 1,000 m further to the point selected track components(rails, sleepers, ballast) according to the vibration measurements and analysis of the frequency characteristics and the results were derived.