A smart structure for wind tunnel investigation of a bridge deck's vortex-induced torsional motion. (February 2016)

• Record Type: Journal Article
• Authors: Cinquemani, S.; Diana, G.; Fossati, L.; Ripamonti, F.
• Is Part Of: Mechatronics. Volume 33(2016)
• Page Start: 108
• Page End: 120
• Publication Date: 2016-02
• Subjects: Smart structure -- Wind tunnel -- Control -- Vortex induced vibration; V Upstream wind velocity (m/s) -- V* Reduced flow velocity (–) -- D Characteristic linear dimension, generic (m) -- C Cross-wind dimension (m) -- μ Dynamic viscosity of air (kg/(m · s)) -- ρ Air density (kg/m3) -- g Gravity acceleration (m/s2) -- m Linear mass or mass per unit length (kg/m) -- M Mass (kg) -- J Moment of inertia (kg · m2) -- f Frequency (Hz) -- fS Strouhal frequency (Hz) -- fn Natural frequency of the nth mode of vibration (Hz) -- Re Reynolds number -- Fr Froude number -- St Strouhal number -- Sc Scruton number -- B Deck chord length (m) -- L Bridge span length (m) -- ξ Damping ratio (–) -- z Oscillation amplitude at the edge (m) -- θ Rotation of the section (rad) -- q (t) Modal coordinates vector, function of time t -- F (t) Vector of external time-dependent forcing terms -- M Modal mass matrix -- R Modal damping matrix -- K Modal stiffness matrix -- Φ Eigenmodes matrix (eigenvectors juxtaposed by columns) -- ΛF Jacobian matrix which links the components of F to the physical coordinates; Computer integrated manufacturing systems -- Periodicals; Flexible manufacturing systems -- Periodicals; Mechatronics -- Periodicals; Productique -- Périodiques; Fabrication, Systèmes flexibles de -- Périodiques; Mécatronique -- Périodiques; Computer integrated manufacturing systems; Flexible manufacturing systems; Mechatronics; Periodicals; 629.89
• DOI: 10.1016/j.mechatronics.2015.11.003
• Languages: English
• ISSNs: 0957-4158

Abstract

Abstract: The paper discusses the design and testing of a smart aeroelastic model of a suspended bridge that allows active regulation of torsional damping through the use of embedded piezoelectric actuators. Depending on test conditions, the structural damping of the model can be adjusted in a fast, precise and repeatable way in order to highlight the effects of the wind interaction. In particular, vortex-induced vibrations are taken into consideration. The main elements of the smart structure (sensors, actuators, control algorithm) have been designed on the basis of a numerical model of the system. Finally the aeroelastic model has been tested in a wind tunnel in different operating conditions and its dynamics have been assessed.