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This paper presents the identification of non-linear suspension parameters using the frequency response function approach. The inverse Fourier transform of FRF (Frequency response function) method is utilized to identify the existing of the non-linearity. In order to identify the non-linear joint parameters, substructured FRF is utilized. It is an extended force-state mapping technique, which transform the response of non-linear joint in time domain data into the frequency one. The frequency domain has the advantage it easily applicable to a complex real structure having non-linear joints as the vehicle suspension one. The method only ultilizes the displacement or velocity data to extrac the non-linear parameters making it simple fOf experiment or minimizing its calculation burden. The polynomial type expression for assuming non-linear characteristics is suggested to extract the accurate non-linear parameters. Also, proposed method can select any experimental data set with any frequency range with less noise contamination one, it can provide relatively accurate data to enhance its accuracy. The validity of the proposed method was acquired with the 3 dof suspension system. The accuracy and usefulness of the present method is discussed with the comparison of real suspension data and identified ones.

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ABSTRACT

1. INTRODUCTION

2. THEORETICAL BACKGROUNDS

3. SIMULATION

4. EXPERIMENTAL RESULTS

5. CONCLUSIONS

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UCI(KEPA) : I410-ECN-0101-2009-556-015135926