Adaptive length SMA pendulum smart tuned mass damper performance in the presence of real time primary system stiffness change

Contreras, Michael; Pasala, D.T.R.; Nagarajaiah, Satish

doi:10.12989/sss.2014.13.2.219

Cited by 16 publications

(10 citation statements)

References 11 publications

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“…Traditional passive TMDs have the widest application in real projects; however, they have the disadvantage of high sensitivity to frequency deviation with the primary structural frequency, and they also have difficulty adjusting the frequency . To solve this problem, several adaptive and semiactive TMDs have been proposed, for example, the semiactive independent variable stiffness device, a semiactive TMD with variable stiffness and damping, and an adaptive length SMA pendulum smart TMD . However, in real engineering, a passive TMD is more welcome than a semiactive TMD.…”

Section: Introductionmentioning

confidence: 99%

An adaptive‐passive retuning device for a pendulum tuned mass damper considering mass uncertainty and optimum frequency

Wang

Shi

et al. 2019

Struct Control Health Monit

112

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A tuned mass damper (TMD) is one of the most used structural control devices. However, a traditional TMD has the disadvantage of high sensitivity to frequency deviation and difficulty adjusting the frequency. The optimal frequency for a TMD is dependent on the structural dominant frequency and the TMD mass ratio. Nevertheless, the actual structural modal mass is difficult to obtain, and the presence of a TMD may interfere with identification of the natural structural frequency. Aiming to control wind-induced vibration, an adaptive-passive retuning device is developed for a pendulum TMD called an adaptive-passive variable pendulum TMD (APVP-TMD). When it is time to adjust the pendulum, the mass will first be locked, and the structural frequency in this case is identified through wavelet transformation by an acceleration sensor and a microcontroller. It is found that this is actually the optimal frequency for the TMD. Then, a stepper motor will adjust the length of the pendulum under the guidance of the microcontroller. The effectiveness of APVP-TMD is verified through both discrete and continuous models. For the discrete model, a single-degree-offreedom primary structure coupled with an APVP-TMD is presented as an experiment with analysis comparison, and a five-degree-of-freedom primary structure coupled with an APVP-TMD is proposed as a numerical simulation. For the continuous model, a wind-sensitive concrete chimney is controlled by an APVP-TMD as a case study. The results all show that the APVP-TMD can identify the optimal frequency and retune itself effectively, and the retuned TMD has better vibration control than the mistuned one.

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Section: Introductionmentioning

confidence: 99%

An adaptive‐passive retuning device for a pendulum tuned mass damper considering mass uncertainty and optimum frequency

Wang

Shi

et al. 2019

Struct Control Health Monit

112

View full text Add to dashboard Cite

show abstract

“…Nagarajaiah presented adaptive passive, semiactive and smart TMDs. Contreras et al studied an adaptive length SMA pendulum smart TMD. Pasala et al proposed an adaptive‐length pendulum smart TMD using shape‐memory‐alloy wire.…”

Section: Introductionmentioning

confidence: 99%

Study on self‐adjustable variable pendulum tuned mass damper

Wang

Shi

Zhou

2018

Structural Design Tall Build

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Pendulum tuned mass damper (PTMD) is usually used to control the horizontal vibration of a tall building. However, traditional PTMD is highly sensitive to frequency deviation and difficult to adjust its frequency. In order to improve this problem of traditional PTMD and protect a tall building more effectively, a novel PTMD, called self-adjustable variable pendulum tuned mass damper (SAVP-TMD), is proposed in this paper. On the basis of the acceleration ratio between TMD and primary structure, the SAVP-TMD can retune itself by varying the length of the pendulum according to the improved acceleration ratio-based adjustment algorithm. PTMD and primary structural accelerations are obtained from two accelerometers respectively, and the acceleration ratio is calculated in a microcontroller, then, the stepper motor will adjust the pendulum under the guidance of the microcontroller under a specific harmonic excitation. The improved acceleration ratio-based adjustment algorithm is proposed and compared to solve the nonconvergent retuning problem. The SAVP-TMD can be regarded as a passive damper including a frequency adjustment device. A single-degree-of-freedom structure model is used to verify the effectiveness of SAVP-TMD through both experimental study and numerical simulation. In order to further verify the effect of SAVP-TMD in the MDOF structure, a five-storey structure coupled with an SAVP-TMD is proposed as a case study. The results of experiment, simulation, and case study all show that SAVP-TMD can retune itself to the primary structural dominant frequency robustly, and the retuned PTMD has a better vibration control effect than the mistuned one. KEYWORDS acceleration ratio, passive control, self-adjustable tuned mass damper, tall buildings, tuned mass damper, variable pendulum

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“…Garrido et al proposed a rotational inertia double‐tuned mass damper, which is more effective than a TMD at the same mass ratio. Nagarajaiah et al analytically and experimentally validated the adaptive length pendulum smart TMD on a primary structure whose frequencies were time invariant and studied its effectiveness on a primary structure with time‐varying frequencies. Roffel et al proposed an adaptive compensation mechanism to overcome the detuning issue in SMPs.…”

Section: Introductionmentioning

confidence: 99%

Control performance of suspended mass pendulum with the consideration of out-of-plane vibrations

Huang

Huo

et al. 2018

Struct Control Health Monit

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Summary The analysis model of a suspended mass pendulum (SMP) control system is usually simplified as a planar model, which only considers the swing angle in‐plane. However, out‐of‐plane vibrations of a pendulum are inevitable and are significantly more complex than that assumed in the planar model. To overcome the limitations of the current planar model, this study proposes a spatial model of the pendulum. The kinetic equations of the spatial SMP model coupled with a single degree of freedom structure are established considering the swing angle of the SMP in‐plane and out‐of‐plane. The vibration characteristics of the pendulum and their influence on the dynamic response of the structure are numerically analyzed. Compared with the numerical results of the planar model, the vibrations of a pendulum are more accurately simulated by the spatial model, even when the rotation angle of pendulum out‐of‐plane is greater than 20°. A parameter study is performed considering the influencing parameters of the control system, including the excitation periods, pendulum length, mass ratio, and amplitudes of the horizontal rotation angle at the maximum displacement of the structure. The results show that the horizontal rotation angle of the pendulum negatively affects the vibration suppression of the structure. Furthermore, to verify the vibration control effectiveness of the spatial SMP model, a transmission tower was controlled under eight types of seismic excitations. The results reveal that the SMP has a clear mitigation effect on the seismic response of the tower.

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Adaptive length SMA pendulum smart tuned mass damper performance in the presence of real time primary system stiffness change

Cited by 16 publications

References 11 publications

An adaptive‐passive retuning device for a pendulum tuned mass damper considering mass uncertainty and optimum frequency

An adaptive‐passive retuning device for a pendulum tuned mass damper considering mass uncertainty and optimum frequency

Study on self‐adjustable variable pendulum tuned mass damper

Control performance of suspended mass pendulum with the consideration of out-of-plane vibrations

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