Abstract
The authors are developing a vibration simulator, which consists of field-portable exciters (actuators) and data processing software, to estimate vertical vibration and riding quality of railway vehicles. One of the main characteristics of the vibration simulator is that the acceleration power spectral density (PSD) at arbitrary point on the carbody while running is synthesized numerically from measured data obtained when each axle box or each wheelset is excited individually. This report focuses upon the data processing technique of the simulator. A series of excitation tests for a commuter vehicle was carried out to confirm the basic concept to synthesize (estimate) the PSD by using the rolling stock testing plant as exciters. Several excitation methodologies and data processing formulae are compared among each other in this report. It is shown that the estimated PSDs well agree with actual PSDs. It is found out that the estimation gives high accurate results when each wheelset is excited individually and acceleration values at excited axle boxes are used in estimation analysis.
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