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Technical Paper

Study of the Relationship between DTV, BTV and BPV over Judder-Type Vibration of Disc Brake Systems

2010-10-10
2010-01-1694
Vehicle brake judder is a vibration phenomenon responsible for an expressive number of customer complaints. In order to prevent judder from occurring, new vehicle developments are putting in practice dynamometer and vehicle brake tests to assess the DTV growth and the effectiveness of applied countermeasures, when necessary. The measurement of DTV is very sensitive and requires high precision sensors. Due to these facts, incorrect DTV measurements are not uncommon, since the rig or vehicle setup, the assembly/disassembly of the sensors or brakes and even the vibration of the dynamometer itself may figure as sources for measurement errors. In the other hand, if the test vehicle or dynamometer is equipped to acquire brake torque and brake pressure variations (BTV and BPV, respectively), those measurements may suffer less interference from external parameters and present good relationship with DTV and judder.
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