Active control in civil engineering: From conception to full scale applications

Auperin, Michel; Dumoulin, Claude; Magonette, Georges; Marazzi, Francesco; Försterling, Heino; Bonefeld, R.; Hooper, A.W.; Jenner, A.G.

doi:10.1002/stc.4300080201

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…These frequencies are closest to those calculated using Eq. 8and (9). The FRF peaks magnitude at the first and the second natural frequencies are 4.198 (m/s 2 )/N and 3.186 (m/s 2 )/N, respectively.…”

Section: Resultsmentioning

confidence: 93%

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Empirical Evaluation of Variation of Orifice Blocking Ratio in a Tuned Liquid Column Damper using Frequency Response Function Measurement

Son¹,

Marshal²,

Bur³

2018

International Journal on Advanced Science, Engineering and Information Technology

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Tuned liquid column damper (TLCD) is a simple technique used to increase the structure resistance to the external load. This type of damper can effectively decrease the structure response when the TLCD parameters such as the natural frequency and damping factor are well selected. Even though several TLCD models have been proposed and many algorithms to optimize the TLCD parameters have been developed. However, it is very little research has been conducted to evaluate the TLCD damping factor experimentally. A simple empirical method for adjusting the TLCD damping factor is by varying the orifice-blocking ratio. In this research, 5 types of blocking ratio were trialled in the TLCD. They were without orifice and with 2, 4, 6 and 8 18 mm diameter orifices. The TLCD is positioned on the second floor of a Two-DOF shear structure. A frequency response function showing the ratio between the response magnitude and the excitation force on the structure in the frequency domain was recorded for each trial. The results show that the TLCDs with orifices damped vibrations more effectively than the one without orifice. The larger the blocking ratio, the larger the TLCD damping factor. Two 18 mm orifices were insufficient to damp the vibration as the blocking ratio is too large and TLCD is less responsive to the vibrations. The optimum condition of a U-Shaped TLCD blocking ratio was found to be 70.77% which corresponded to 4 holes of 18 mm orifice diameter. This type of TLCD dampened up to 80.04% of the vibration magnitude.

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Section: Resultsmentioning

confidence: 93%

“…The active control method has been proposed and developed to improve the vibration control performance. A comprehensive evaluation of active control in civil engineering from conception to full-scale applications has studied by Auperin [9].…”

Section: Introductionmentioning

confidence: 99%

Empirical Evaluation of Variation of Orifice Blocking Ratio in a Tuned Liquid Column Damper using Frequency Response Function Measurement

Son¹,

Marshal²,

Bur³

2018

International Journal on Advanced Science, Engineering and Information Technology

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“…With the direct piezoelectric effect, the actuator can be taken as sensors. In addition, the collocated wave control can also be implemented by a tendon actuator collocated with a force sensor .…”

Section: Wave Active Controlmentioning

confidence: 99%

Linear dynamic analysis and active control of space prestressed taut cable net structures using wave scattering method

Wang

2015

Struct. Control Health Monit.

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Summary In this paper, the linear dynamic analysis and active control of prestressed taut cable net structures are investigated by the wave scattering method. Wave motion equations of cables are firstly derived to obtain the wave dispersion characteristics, which are the combinations of the longitudinal tensile wave equations of bars and transverse wave equations of taut strings. The waveguide and scattering matrices of cables are then formed by the force balance and displacement boundary conditions. The derivation of the traveling wave model of cable net structures is accomplished by combining systematic scattering matrix with transmission matrix. Finally, the wave active control method is proposed based on the established traveling wave model. The comparison of results obtained by the wave scattering method with the finite element method shows an excellent agreement. But more importantly, it demonstrates that the computational efficiency of the wave scattering method is higher for dynamic analysis of large‐scale cable net structures. The effectiveness of the proposed wave active control method is verified by a planar cable net structure. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Thus, active control has often been preferred during construction, where very good performances have been achieved 7. Active control of a large‐scale bridge mock‐up has also proved relevant to supplement a weakly damped structure with a significant broadband damping 8. However, the necessity of an always available power source and the fear for a lack of stability due to spill‐over or poor robustness have naturally led to explore semi‐active strategies, which inherit the stability of passive systems while still offering some degree of adaptivity.…”

Section: Introductionmentioning

confidence: 99%

An adaptive pendulum for evolving structures

Mekki¹,

Bourquin²,

Maceri

et al. 2011

Struct. Control Health Monit.

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Tuned mass dampers (TMDs) supplement existing structures with damping while preserving stability. As evolutions of the structure to be controlled may pull down the performance of this kind of device, large bridges under construction in windy areas are rather equipped with active devices such as AMDs that prove efficient (7th International Seminar on Seismic Isolation, Passive Energy Dissipation and Active Control of Vibrations of Structures, Assisi, Italy, 2001). However, active devices suffer from several drawbacks such as the necessity to carefully prevent from instability, especially in the case of noncollocated control. Therefore, a natural question arises: how to adapt a TMD in such a way to make its performance independent of the structural evolution? A new type of semi-active control system matching this requirement is presented. It builds upon a TMD of pendulum type. In order to damp the torsional mode of a bridge under construction, a gear with an alternator would connect the pendulum to the structure. As the bridge starts vibrating, the pendulum begins to oscillate and the alternator converts the mechanical energy into electrical energy to be dissipated through an exterior resistor via the Joule effect. Given an optimal design of a passive tuned pendulum damper (TPD) for the structure in its current configuration, the semi-active control strategy consists in changing the resistor in real-time in such a way to lock the apparent stiffness and damping of the real TPD at their desired optimal values no matter the current construction step. Resistor tuning is mandatory even when only one construction step is considered since a constant resistor within the alternator would yield a time-varying effective damping coefficient of the pendulum, whereas the desired optimal damping assumes a given value, which does not change until the structure or load type changes. The semi-active control law easily adapts to any change of the structure provided this change is known. The control algorithm relies on the knowledge of the pendulum rotation, of the frequency of the mode to be controlled and of its modal participation factor at the TPD location. These modal parameters are computed during the construction process, or can be viewed as outputs of a SHM system. How to get these parameters has already received a lot of attention in the SHM literature and is not discussed here. Experimental validations on a small-scale bridge mock-up confirm the interest of the approach

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Active control in civil engineering: From conception to full scale applications

Cited by 6 publications

References 10 publications

Empirical Evaluation of Variation of Orifice Blocking Ratio in a Tuned Liquid Column Damper using Frequency Response Function Measurement

Empirical Evaluation of Variation of Orifice Blocking Ratio in a Tuned Liquid Column Damper using Frequency Response Function Measurement

Linear dynamic analysis and active control of space prestressed taut cable net structures using wave scattering method

An adaptive pendulum for evolving structures

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