Year-end Sale % OFF 
Abstract
In previous studies, the pounding tuned mass damper (PTMD) has been successfully demonstrated to mitigate the undesired vibration of a variety of structures at room temperature. The advantages of the PTMD over the traditional tuned mass damper (TMD) has been verified through theoretical analysis and experimental investigations. However, the PTMD relies on an impact layer made of viscoelastic material to improve its vibration control performance and robustness against detuning effect. The energy dissipation of the viscoelastic material can be affected by the changes of environmental temperature. Therefore, this paper aims to study the impact damping behavior of the viscoelastic material in the low temperature environment of the sea bed where the PTMD is expected to control vibrations of subsea pipelines. The experimental apparatus fabricated in the previous study to generate and measure the lateral impact was housed inside a refrigerator. The experimental results indicate that the pounding stiffness decreased whereas the energy dissipation increased in the low temperature environment. Moreover, an impact fatigue test was also performed in the low temperature environment and compared with the room temperature case. Experimental results from a previous study show that the viscoelastic material was damaged after 36,000 cycles of impacts in the room temperature and a cyclic hardening–softening process was observed. However, in the low temperature environment, the viscoelastic material was damaged after 50,000 cycles of impacts and the cyclic hardening–softening process was not observed. As the impact cycle grew, the pounding stiffness decreased from 53,000 N/m1.5 to 17,000 N/m1.5 and the energy dissipation increased from 46.12 J/m per cycle to 65.4 J/m per cycle.
Highlights
Undesirable vibrations occur in structures, such as buildings [1], bridges [2], engines [3,4]and aerospace structures [5,6,7], and the mitigation of these vibrations has been investigated for decades
A specially designed experimental device was established in a refrigerator
An impact test and an impact fatigue test were conducted with this tester
Summary
Undesirable vibrations occur in structures, such as buildings [1], bridges [2], engines [3,4]and aerospace structures [5,6,7], and the mitigation of these vibrations has been investigated for decades. The tuned mass damper (TMD), which belongs to the passive control techniques, has been widely accepted for a variety of structures to mitigate wind-induced vibrations [18], seismic responses [19], vortex-induced. The earliest invented by Frahm was composed of a mass mounted a main The earliest. TMD,TMD, invented by Frahm [23], [23], was composed of a mass blockblock mounted on a on main structure to be controlled with a specially designed spring. This device was effective in reducing structure to be controlled with a specially designed spring. This device was effective in reducing the the vibration its resonance frequency
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
