A bidirectional and homogeneous tuned mass damper: A new device for passive control of vibrations (original) (raw)

Application of Tuned Mass Dampers for Structural Vibration Control: A State-of-the-art Review

Civil Engineering Journal

Given the burgeoning demand for construction of structures and high-rise buildings, controlling the structural vibrations under earthquake and other external dynamic forces seems more important than ever. Vibration control devices can be classified into passive, active and hybrid control systems. The technologies commonly adopted to control vibration, reduce damage, and generally improve the structural performance, include, but not limited to, damping, vibration isolation, control of excitation forces, vibration absorber. Tuned Mass Dampers (TMDs) have become a popular tool for protecting structures from unpredictable vibrations because of their relatively simple principles, their relatively easy performance optimization as shown in numerous recent successful applications. This paper presents a critical review of active, passive, semi-active and hybrid control systems of TMD used for preserving structures against forces induced by earthquake or wind, and provides a comparison of the...

Dynamic Response of Structure with Semi-Active Tuned Mass Friction Damper

2006

A passive tuned mass friction damper (P-TMFD) has a pre-determined and fixed slip force at which it can reduces the response of the structure effectively. At any value other than the predetermined slip force, it losses its effectiveness and simply behaves as a normal bracing system. Also, P-TMFD changes its state between stick and slip mode many times during a seismic or harmonic excitation which results in high frequency response of the system and reduces its efficiency. To overcome the disadvantage of P-TMFD, a semi-active tuned mass friction damper (SA-TMFD) is proposed. The control algorithm proposed by Lu (2004) which is known as Predictive control law, is used. The SA-TMFD produces continuous and smooth slip force and eliminates the high frequency response of the structure which usually occurs in case of PTMFD. The governing differential equations of motion of the SDOF system with SA-TMFD are solved numerically using state-space method. To investigate the effectiveness of SA-T...

Passive Tuned Mass Damper for Seismic Protection

2013

One of the approaches to reduce excessive oscillation on buildings due to dynamic forces is represented by installing a passive mechanical device called tuned mass damper (TMD). This paper presents a study on the effectiveness of TMD in reducing the response of structures that are subjected to seismic excitation. The earthquake accelerograms of El Centro’40 and Kobe’95 are considered, and a two-dimensional linear-elastic model with TMD on the top is used in performing dynamic analysis.

Dynamic response of structure with tuned mass friction damper

International Journal of Advanced Structural Engineering

The effectiveness of tuned mass friction damper (TMFD) in suppressing the dynamic response of the structure is investigated. The TMFD is a damper which consists of a tuned mass damper (TMD) with linear stiffness and pure friction damper and exhibits non-linear behavior. The response of the single-degree-of-freedom (SDOF) structure with TMFD is investigated under harmonic and seismic ground excitations. The governing equations of motion of the system are derived. The response of the system is obtained by solving the equations of motion, numerically using the state-space method. A parametric study is also conducted to investigate the effects of important parameters such as mass ratio, tuning frequency ratio and slip force on the performance of TMFD. The response of system with TMFD is compared with the response of the system without TMFD. It was found that at a given level of excitation, an optimum value of mass ratio, tuning frequency ratio and damper slip force exist at which the peak displacement of primary structure attains its minimum value. It is also observed that, if the slip force of the damper is appropriately selected, the TMFD can be a more effective and potential device to control undesirable response of the system.

On tuned mass dampers for reducing the seismic response of structures

Earthquake Engineering & Structural Dynamics, 2005

This paper presents an energy-based theoretical model for a two degree-of-freedom mechanical system. After a general formulation in Appendix A, the model is specialized to study tuned mass dampers as a means to substantially increase modal damping in order to induce a consequential decrease of the seismic response of the structures thus provided. Although approximate since it neglects coupling due to damping, it is shown that the model yields a ÿrst-order approximation to the exact frequencies, providing values of optimum damping that closely match exact results proposed by others. In view of this, it is proposed that the model be applied through an iterative numerical procedure that identiÿes the pertinent optimum parameters. It is also shown that for certain particular benchmark cases the model provides closed-form equations for the parameters deÿning the dynamic states related to these special conditions. Despite its approximate nature the model presented in this paper is rational, and due to its explicit consideration of energy balance and overall simplicity, it provides a convenient platform for the study of tuned mass dampers, as well as for other methods of structural passive control. Copyright

Review Paper on “Tuned Mass Damper”

Journal of Advances and Scholarly Researches in Allied Education

Now a days, structures are continuously increasing in the construction industries which are having a very low damping value. The structures can easily fail under structural vibrations induced by earthquake and wind, some several techniques are available today to control the vibration of the structure, TMD is one of these techniques are use today. Some investigations are carried out to identify the importance and performance of tuned mass damper in different structures. In this thesis, a one-storey and a two-storey building frame models are developed for shake table experiment under sinusoidal excitation to observe the response of the structure with and without TMD. The TMD is tuned to the structural frequency of the structure keeping the stiffness and damping constant. Various parameters such as frequency ratio, mass ratio, tuning ratio etc. are considered to observe the effectiveness and robustness of the TMD in terms of percentage reduction in amplitude of the structure. Then the responses obtained are validated numerically using finite element method. From the study it is observed that, TMD can be effectively used for vibration control of structures.

Control of Structural Response with a New Semi-Active Viscous Damping Device

2015

Semi-active control devices can perform significantly better than passive devices, but also have the potential to achieve the performance approaching that of a fully active system. Semi-active devices offer significant promise for their ability to add supplemental damping and reduce seismic structural response in an easily controllable manner, and can be used in some modes to modify or reshape hysteretic structural response. However, many current semi-active devices are highly complex, limiting robustness, while those that can generate larger forces suffer from increased response lag time to do so. Thus, an ideal semi-active device would offer high forces, low complexity, and fast response. The semiactive viscous dampers could offer all these properties and could reduce not only the displacement response of a structure, but also the base shear. There are three semi-active viscous dampers, a 1-4, 1-3 and 2-4 device. In this study, a spectral analysis over periods of T= 0.2-5.0 sec un...

Design Criteria of Tuned Mass Damper Systems to Control Vibrations of Building Structures

This paper investigates the effectiveness of a passive Tuned Mass Damper (TMD) attached to a three story building in reducing the response of the structure to harmonic and seismic excitations. Some examples of existing building structures that contain tuned mass dampers are briefly described. Generally, inertial mass is attached near the top, through springs and viscous damping mechanisms. The frequency of the TMD is normally tuned to a particular frequency of the structure so that the two peaks of the frequency response curve of the damped system have the same dynamic amplification, when expressed in terms of displacements. Design charts and equations to determine the optimum values of mass, damping, and stiffness for a passive TMD are illustrated. Numerical simulations have been performed to assess the optimum TMD efficiency in reduction of the seismic and harmonic response of the structure. In addition, this paper shows that a TMD is more effective to mitigate the vibrations indu...