Operational modal analysis that estimats the vibration characteristics using only dynamic response has been becoming mainstream. In the previous study the change of identification results depend on the configuration of calculation parameter was analyzed by using the analysis response of the microtremor simulation. Because the actual response was affected by the observed noise due to the external force to the excite state and the variation response. In this study, proper parameters are investigated by using the actual response, and the influence of calculation parameters by different excitation state and bridge type are considered.
