Abstract
<p class="TTPAbstract">Tuned Liquid Column Damper (TLCD) has become an alternative solution for reducing low frequency vibration response of machines and structures. This is not surprisingly that the damper has simply structure and low maintenance cost. The main disadvantage of using TLCD is the complexity in controlling TLCD damping factor experimentally. Theoretically, damping factor can be controlled by adjusting the orifice dimension. However, this method is time consuming and not appropriate conducted in the real application. A more simply method for adjusting TLCD damping factor is by varying the fluid viscosity. This research is aimed to evaluate the effect of fluid viscosity to the damper performance. Two DOF shear structure with TLCD is used as the experimental model. Several TLCD fluids with different viscosity are evaluated. Evaluation of TLCD damping factor due to variation of the fluid viscosity is conducted by comparing the Frequency Response Function (FRF) obtained from the experimental data.</p>
Highlights
Nowadays, several methods have been developped to reduce vibration response of mechanical and structural system in accordance with either serviceability or safety criteria
The amplitude ratio which describes the Frequency Response Function (FRF) of the structure is calculated by dividing the frequency response of the 2nd floor with the frequency response of the excitation signal
Because of the Tuned Liquid Column Damper (TLCD) damper is designed according to the 1st natural frequency of the structure the enlargement of frequency response is focused to the area located near to this frequency zone
Summary
Several methods have been developped to reduce vibration response of mechanical and structural system in accordance with either serviceability or safety criteria. For a large structure such as building and bridge, strengthening the structural system or installing of the base-isolation could be very costly or too difficult to perform. For this case, incorporating a passive damper into the structure is relatively less expensive and much simpler to be realized. Among passive DVA, Tuned Liquid Column Damper(TLCD) is of great interest for some of its characteristics such as easy implementation, low cost of construction and maintenance and no need to add mass to the structure if the liquid is used as water supply[4]. The passive DVA performance is greatly depend on the selection of the damper natural frequency and damping factor. Variation of TLCD damping by modifying of the orifice hole is difficult to be conducted experimentally[6]
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