Study On Velocity Exponent Of The Viscous Damper And Its Engineering Applications

In recent years, the energy dissipation damping technology has been gradually applied in the construction field and highlighted their strengths so developing a simple and practical new-type energy dissipation devices in order to meet the needs of the actual construction is an inevitable trend. Viscous damper by the virtue of its simple structure and advantage of the none additional stiffness added to the construction sector has been more than 50 years of history. At the conclusion of this article at home and abroad in recent years, viscous dampers, based on their theoretical analysis of performance and energy-consuming of the mechanism, including the following aspects:First, studied the relationship between the energy dissipation and the damping force through the analysis of the effect of laminar flow and turbulent flow of viscous damper, and obtained a linear viscous damper model and the calculation formulas.Secondly, We designed and manufactured a orifice-type viscous damper, and two different damping media were studied in order to get the damping the speed and damping force relationship At the same time, using fluid finite element CFD software-Fluent to simulate analysis and numerical simulation results and experimental results were compared and analyzed. The results show that the linear flow model is the key factor to get a linear relationship between speeds and damping force, the turbulence plays important role in getting higher velocity exponent. The process of velocity exponent changing form 1 to 2 is the process of viscous flow model of the transition from laminar flow to turbulence model of the processIn addition, we studied the velocity exponent based on the theory of fluid mechanics. The results show that the basic Newtonian fluid mechanics for the velocity exponent can be a minimum of 1. If you do not want changing the structure of the orifice to get a high efficient damper changing the rheological behavior to non-Newtonian fluid as the damping medium is one of the ways, lower velocity exponent may also be get by changing the form of orifices.Finally, the project relies on the use of finite element analysis software Etabs and perform-3d to design and established model simulating the earthquake response of the structure with viscous dampers. Elastic case in which the software Etabs was used to simulate, in elastic-plastic stage fiber-based beam element Perform-3d model was used, by comparing story drifts and stress and strain before and after dampers were added to the structure to give the final comprehensive evaluation of seismic performance.