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박주표(Ju-Pyo Park),최연선(Yeon-Sun Choi) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In order to investigate the machanism of brake squeal noise, the sound and vibration of an actual brake system were measured using a brake dynamometer. The experimental results show that disc nin-out varies with brake line pressure and the factor squeal generation is the run-out to the misalignment of brake disk. A three drgrees of freedom friction madel is developed is developed for the disk brake system where the run-out effect and ninlinear friction characterstic are considered, The results of numerical analysis of the model agree well with the experimental results. Also, the stability analysis or the model was performed to predict the generation of brake squeal due to the desige parameter modification of brake systems. The results show that the squeal heneration depends on the run-out rather than the friction characteristic between the and the disk of brake.
박주표(Ju-Pyo Park),최연선(Yeon-Sun Choi) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.4
The suspension system of cars is composed of dampers and springs, which usually have nonlinear characteristics. The nonlinear characteristics make the differences in the results of analytical models and experiments. In this study. the nonlinear system identification method which does not assume a special form for nonlinear dynamic systems and minimize the error by calculating the error reduction ratio is devised to estimate the nonlinear parameters of the suspension system of an EF-SONATA car from the field running test data. The results show that the spring has a cubic nonlinear term and the damper has a coupled nonlinear term. Also, the numerical results with the estimated nonlinear parameters agree well with the field test data for the different running speeds.
박주표(Ju-Pyo Park),최연선(Yeon-Sun Choi) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.5
To investigate the mechanics of brake squeal noise, the sound and vibration of an actual brake system was measured using a brake dynamometer. The experimental results show that disk run-out due to the misalignment of brake disk varies with brake line pressure and becomes the important factor of brake squeal noise generation. Also, it was confirmed that the frequency of the squeal noise equals to the natural frequency of the disk bending mode.<br/>