Abstract
This paper investigates the control performance of pounding tuned mass damper (PTMD) in reducing the dynamic responses of SDOF (Single Degree of Freedom) structure. Taking an offshore jacket-type platform as an example, the optimal damping ratio and the gap between mass block and viscoelastic material are presented depending on a parametric study. Control efficiency influenced by material properties and contact geometries for PTMD is analyzed here, as well as robustness of the device. The results of numerical simulations indicated that satisfactory vibration mitigation and robustness can be achieved by an optimally designed PTMD. Comparisons between PTMD and traditional TMD demonstrate the advantages of PTMD, not only in vibration suppression and costs but also in effective frequency bandwidth.
Highlights
An offshore platform is essential equipment for ocean oil development with high construction cost, and it may lead to serious damage when subjected to seismic effects [1, 2]
Wu et al.’s study [4] on high response performance of Tuned mass damper (TMD) indicates that TMD can significantly reduce the vibration of the platform and a remarkable decreased power spectral density can be achieved
That means the optimal damping ratio which is based on TMD is no longer applicable to pounding tuned mass damper (PTMD) due to pounding effects
Summary
An offshore platform is essential equipment for ocean oil development with high construction cost, and it may lead to serious damage when subjected to seismic effects [1, 2]. Tuned mass damper (TMD) is a traditional control device installed on the offshore platform to reduce the seismic vibration responses. (1) Limiter of TMD (2) Bottom board (3) Limiter of pounding device (4) Viscoelastic material (5) Spring (6) Damper (7) Mass block (8) Rolling bearings Despite the former new analysis technologies, some novel control devices were proposed on platforms too. Lotfollahi-Yaghin et al [17] verified the seismic control performance of tuned liquid damper (TLD) on typical offshore jacket-type platforms excited by El Centro, Kobe, and Tabas earthquakes. In this paper, taking an offshore jacket platform as an example, control performance and robustness of PTMD for vibration reduction in SDOF structure are analyzed to investigate the seismic control performance. A comparison between PTMD and traditional TMD is presented to verify the advantages of PTMD
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