Earthquake Resistance Technique by PTMD (Pendulum Tuned Mass Damper)

EasyChair Preprint 5083

Abstract

The objective of this thesis is to describe the design, construction, implementation and performance of a prototype adaptive pendulum tuned mass damper (PTMD). Furthermore the thesis aims at demonstrating the performance improvements obtained when the pendulum tuned mass damper (PTMD) parameters are optimized. The study considers the effect of adjusting the PTMD tuned frequency and damping ratio on a two storey test structure subjected to broadband and narrowband excitation. An analytical model of the PTMD for a singledegree-of-freedom (SDOF) structure is used to demonstrate the performance improvements when the PTMD parameters are optimized. The optimized model considers the effects of adjusting the frequency ratio, damping ratio, and mass ratio of the combined system to reduce the maximum deflection dynamic vibration absorber when the structure is subjected to a harmonic excitation force. The analytical model is used to simulate the optimal performance of the PTMD system. The experimental PTMD is capable of identifying the structural vibration modes in real time and tuning to the desired mode. The structural vibration control modes are identified by calculating the windowed power spectral density of the structure’s acceleration, followed by peak-picking algorithm to identify the modal frequencies. Tuning is performed by moving the pivot location of the pendulum arm via a tuning frame along a set of rails. The design also allows for changes in the external dampening force. An adjustable damper is attached to the pendulum mass to allow for control of the PTMD damping ratio.

Keyphrases: Mass ratio, Pendulum Tuned Mass Damper, damping ratio, dynamic vibration absorber, vibration control

@booklet{EasyChair:5083,
  author    = {Shubham Sawant and Ashpak Shaikh and Pratik Pawar and Hiran Sharma},
  title     = {Earthquake Resistance Technique by PTMD (Pendulum Tuned Mass Damper)},
  howpublished = {EasyChair Preprint 5083},
  year      = {EasyChair, 2021}}