Abstract
Disc brake has been used in many applications not only in automobile but also, industrial and railway engineering. However, the brake operation at low speed may create a squeal which cause an unpleasant experience to the passenger. In the research of squeal suppression, active control has the advantage due to its adaptability in design of the control system. However, the verification of the determination of the emerging stage of the squeal has not much been in attention. The high efficient method for determination of the brake squeal is required the accuracy, robustness of the noise from the vehicle and capability to determine the emerging stage of the squeal as earliest for the determination of the squeal. This research presented the verification of the accuracy of the brake squeal determination method, as well as the construction of its sequential algorithm which shorten the required time in the simulation. In this research, we introduced the Hilbert-Huang transform (HHT) for analyzing the nonlinear and unsteady signal. The simulation was performed by analyzing the signal, which was measured from the experiment of brake in laboratory and in practical vehicle, with HHT and other analysis such frequency transformation and time-frequency transformation. Then, the simulation results from each analysis method were compared in order to verify the accuracy of the determination method. Moreover, since the analysis using the HHT required much calculation time, we constructed an algorithm which can shorten the calculation time by recursively analyzing the data of signal. In conclusion, the analysis with HHT gave the highest robustness against the noise of the vehicle during braking when compared with other frequency, or time-frequency analysis. The constructed sequential algorithm was able to reduce the total calculation time, and the error was reduced when compared to other typical algorithms.
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