Along-wind response control of chimneys with distributed multiple tuned mass dampers

Abstract

The effectiveness of distributed multiple tuned mass dampers (d-MTMDs) for multimode control of chimney for along-wind response is presented. A concrete chimney considered herein is an assemblage of two-dimensional (2D) beam elements, each assumed to have constant diameter over the element length. Along-wind forces are simulated using the Kaimal wind spectrum.The response of the chimney is to be controlled by installing tuned mass dampers (TMDs). Suitable locations of the TMDs are identified along height of the chimney based on its uncontrolled (NC) mode shapes. A TMD unit is placed where the mode shape amplitude of the chimney is the largest or larger in a particular mode to be controlled and is tuned with the corresponding modal frequency-the approach is called multimode vibration response control. The number of modes to be controlled is decided according to desired total modal mass participation. The coupled differential equations of motion for the system are derived and solved using Newmark's step-by-step iteration method. The displacement and acceleration responses of the chimney under the alongwind forces are computed to study the effectiveness of the d-MTMDs as compared with single tuned mass damper (STMD) and with arbitrarily installed d-MTMDs (ad-MTMDs). In addition, suitable mass and damping ratios for the STMD, ad-MTMDs, and d-MTMDs are obtained to achieve improved dynamic response control. It is observed that the d-MTMDs are effective controllers being designed as per vibration mode to be controlled.

Experimental and numerical studies of a novel asymmetric nonlinear mass damper for seismic response mitigation

“…To address those issues, multiple TMDs (MTMDs) with a wide band of controllable frequencies were developed in the past years . However, although MTMDs allowed the resonant response to be efficiently reduced at a wider range, responses with high‐frequency components beyond the frequency range of MTMDs were often observed .…”

“…To address those issues, multiple TMDs (MTMDs) with a wide band of controllable frequencies were developed in the past years. [22][23][24][25][26][27][28][29] However, although MTMDs allowed the resonant response to be efficiently reduced at a wider range, responses with high-frequency components beyond the frequency range of MTMDs were often observed. 24,25 In addition, a large number of small masses are commonly required to achieve sufficient robustness against detuning, 22,23,26 which raised the space demand and installation difficulty.…”

Influence of inerters on the vibration control effect of series double tuned mass dampers: Two layouts and analytical study

“…In order to remedy the aforementioned shortcomings, numerous research works have been conducted on improving the control capability without adding supplemental weight to the absorbing oscillator. Recently developed approaches cover multiple TMDs (MTMDs), TMDs with inerter, and hybrid TMDs …”

“…In order to remedy the aforementioned shortcomings, numerous research works have been conducted on improving the control capability without adding supplemental weight to the absorbing oscillator. Recently developed approaches cover multiple TMDs (MTMDs), [6][7][8] TMDs with inerter, [9][10][11] and hybrid TMDs. [12][13][14] The MTMD is achieved by arranging multiple units of classic TMD either in series or parallel connection.…”

Seismic response control of asymmetric buildings using tuned mass dampers

“…[8][9][10][11][12] The placement of relatively huge mass at one floor or position had still been a problem for researchers and engineers.Therefore, researchers proposed the concept of MTMDs vertically distributed spatially along the height of the structures. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Generally, due to the architectural and functional requirements, most of the buildings are plan-wise irregular and asymmetric. The vibration modes for these types of buildings are translation-rotation coupled.…”