Vibration analysis for the determination of modal parameters of steel catenary risers based on response-only data

This paper presents a comparative study to determine modal parameters (periods and mode shapes) of a Steel Catenary Riser (SCR) taking into account only output data of acceleration records. Two methods are used to identify the operational frequencies of a riser, the Frequency Domain Decomposition Method (FDDM) and the Conventional Spectral Analysis Method (CSAM). This work takes into account the output response obtained through numerical simulations at various points along the riser. The identified and the theoretical parameters show good agreement.