Inerter assisted robustness of compliant liquid column damper

Abstract

Summary Inerter‐augmented tuned mass dampers (TMDI) demonstrated considerable performance robustness. A tuned liquid column damper (TLCD) offers reduced mass ratio than a TMD for identical efficiency. TLCD provides additional dissipation by flow through orifice. Motivated by these attributes, this study employs an inerter in conjunction with a TLCD. The compliance for installation of an inerter is availed by employing a compliant liquid column damper (CLCD) instead of a TLCD. The combined system is referred herein as the compliant liquid column inerter damper (CLCID). The effectiveness of the CLCID is demonstrated using a single degree of freedom (SDOF) structure and a multi‐degree of freedom (MDOF) structure. Schematic of enabling structures are suggested to facilitate installation of inerter in low‐rise and relatively tall buildings. The equations of motion for the SDOF/MODF structure and CLCID are derived and solved separately assuming a random earthquake model and recorded ground accelerations as input. The stochastic responses are employed in performing a design optimization for the CLCID parameters. The optimal performances are demonstrated subsequently under the recorded motions. The CLCID is shown to remarkably improve the control efficiency (from a range of 30%–40% in CLCD to 50%–80% in a CLCID). The efficiency of the CLCID under alternative placement of inerter between the top story and the ground/another story is demonstrated. The noted improvements show significant robustness, unparallel to the liquid dampers reported till date.

A tuned liquid mass damper implemented in a deep liquid storage tank for seismic vibration control of short period structures

“…[ 45–47 ] In order to improve the performance and robustness of, inerter devices are also attached recently. [ 48–51 ] Tuned liquid particle damper is proposed, and its efficiency was demonstrated numerically and experimentally. [ 52,53 ]…”

“…[45][46][47] In order to improve the performance and robustness of, inerter devices are also attached recently. [48][49][50][51] Tuned liquid particle damper is proposed, and its efficiency was demonstrated numerically and experimentally. [52,53] The performance of TLD for suppressing vibration of short period structures was demonstrated by Banerji et al [14] However, the efficiency is compromised due to lack of tuning and consequent hindrance to shallow wave breaking.…”

Variable friction‐tuned viscous mass damper and power‐flow‐based control

“…Vibration control issue in engineering has attracted an increasing amount of attention of researchers, 1–7 of which the inerter‐based vibration reduction approaches are effective and popular in recent years 8–12 . The mentioned inerter basically refers to an inertial element with two independent terminals 13 .…”