Concerning the potential for low frequency brake squeal noises from motorcycles, the issue of the noise caused by the structural instability of the system was addressed with mode-coupling mechanism analysis utilizing complex eigenvalue analysis. The equation of motion of the brake system was simplified by converting it from the physical domain to the modal domain. The parameters required for the stability analysis were obtained from the normal mode solution of the system model. Moreover, it was possible to decrease the time required for repeat calculations with different friction coefficients and to complete instability-cause analysis in a mode by 70% or more by using a numerical-analysis solver. A highly accurate analysis model was established and applied in the new approach to specify the modes affecting squeal noises and to study countermeasures. From the test results for the subsequently modified brake system, it was verified that the new method is effective for quickly predicting and making countermeasures for brake squeal noises in the design stage.
Article of Honda R&D Technical Review Vol.13 No.2 (159 - 166)