The Proposal of Real-Time Data Processing Methods for Non-Stationary Vibration Including Conversion of the Time and Spatial Frequency Corresponding to Change of Vehicle Speed

Abstract

The budget assigned to construction of infrastructures is reduced in our country in recent years. The tendency continues, and the importance of maintenance for the life prolongation of existence structures becomes more important. As for freeways, the maintenance for comfort securement as well as safety is important from the view of users' needs. The smoothness of the pavement surface plays a key role for the comfort evaluation of the freeway under a vehicle running condition. IRI (International Roughness Index) is defined as the index to estimate the ride quality of the vehicle running by evaluating the smoothness of the road surface. Authors have developed the IRI instrumentation system by which the road surface profile can be estimated even when the vehicle velocity changes while running. The sequential processing algorithm is presented for real time processing for non-stationary data analysis, which includes time and spatial analysis.