Active tuned mass damper

Rasouli, S. K., Yahyai, M. (2002). Control of response of structures with passive and active tuned mass dampers. Structural Design of Tall Buildings, 11, 1-14. doi 10.1002/tal.l81... 

SEMI-ACTIVE TUNED MASS DAMPER SYSTEM... 

Most of the above studies have related to the use of dynamic vibration absorbers in mechanical systems. While application ofthese systems in civil engineering structures, frequently known as tuned mass damper (TMD) systems, is expected to be different. In last decades, many research studies have been performed to show the effectiveness of the TMD system and the other control devices, derived from TMD, such as semi-active tuned mass dampers (STMDs) and active tuned mass dampers (ATMDs) in civil engineering community in reducing the structural responses, some of which are reviewed in the following. 

The tuned mass damper (TMD) system is a typical form of control devices including a mass, spring, and a viscous fluid damper, which can be attached to the main structure at one of its degrees offreedom. This system is one ofthe well-accepted devices to control flexible structures, particularly, tall buildings. In this passive control system, if its damping ratio or stiffness of the spring changes with time, then it is called a semi-active tuned mass damper (STMD). 

The equation of motion of the building with a semi active tuned mass damper (STMD) control device is the same as the structure with TMD, but in this case the damping ratio of STMD is a time varying, and can be expressed as which... 

Chey, M. H., Chase, J. G., Mander, J. B., Carr, A. J. (2009). Energy-dissipative semi-active tuned mass damper building systemsfor structural damage reduction. Paper presented at the International Symposium. 

Hrovat, D., Barak, P, Rabins, M. (1983). Semiactive versus passive or active tuned mass damper for structural control. Journal of the Engineering Mechanics Division, 109,691-705. doi 10.1061/ (ASCE)0733-9399(1983)109 3(691)... 

Semi-active tuned mass damper systems. 19 Australasian Conference on Mechanics of Structures and Materials (ACMSM), Christchurch, New Zealand. 

Pinkaew, X, Fujino, Y. (2001). Effectiveness of semi-active tuned mass dampers under harmonic excitation. Engineering Structures, 23(7), 850-856. doi 10.1016/SO141 -0296(00)00091 -2... 

Liedes, T. (2009). Improving the performance of the semi-active tuned mass damper. University of Oulu. Finland Oulu University Press. 

Semi Active Tuned Mass Damper (STMD) In passive TMD system, if its damping ratio or stififiiess of the spring changes with time, then it is... 

Active devices are able to change the control force, applied to the stmctuie according to the optimal control requirements. They allow more effective control, but external energy source is required for activation of these devices. In other words, active controlled devices externally activated and apply control forces to the stmcture in order to improve its performance. Active devices include active tendons, active tuned mass dampers and actuators. 

Active control strategies have been developed in the 1990s, (Soong 1990 Housner et al. 1997) they operate by using external energy supplied by actuators to impart forces on the structure. The appropriate control action is determined based on measurements of the structural response. Active control devices include the active tendon system (Abdel-Rohman and Leipholz 1983), the active bracing system (Reinhom et al. 1989), and the active tuned mass damper (Abdel-Rohman and Leipholz 1983). 

Semi-active tuned mass dampers are similar to TMDs, but with the capability of varying then-level of damping. They are mainly used for wind vibration reduction. Another type of semi-active TMD is the semi-active variable stiffness tuned mass damper (SAIVS-TMD), where the stiffness is also controllable. Their performance is similar to that of AMDs but with less power consumption. 

Chang J, Soong TT (1980) Structural control using active tuned mass dampers. J Eng Mech Div ASCE 106 (6) 1091-1098... 

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