Relaminarization in highly favourable pressure gradients on a convex surface13;

Mukund, R and Viswanath, PR and Narasimha, R and Prabhu, A and Crouch, JD (2006) Relaminarization in highly favourable pressure gradients on a convex surface13;. Journal of Fluid Mechanics, 566 (--). pp. 97-115.

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Abstract

The active stiffening and active compensation analyses are carried out to present the influence of active stiffness on the dynamic behaviour of piezo-hygro-thermo-elastic laminates. A coupled piezoelectric finite element formulation involving a hygrothermal strain field is derived using the virtual work principle and is employed in a nine-noded field consistent Lagrangian element. The closed-loop system is modelled with elastic stiffness, active stiffness introduced by isotropic actuator lamina and geometric stiffness due to stresses developed by hygrothermal strain. Through a parametric study, the influence of active stiffening and active compensation effects or the dynamics of cross-ply and angle-ply laminated plates and shells are highlighted. The active stiffening on thin shells is significantly influenced by boundary effects and the actuator efficiency further decreases with increase in curvature. The reduction in natural frequencies of cross-ply laminates due to hygrothermal strain is actively compensated by active stiffening; however, it is observed that the actuator performance reduces significantly with increase in curvature particularly in angle-ply laminates, which demands the use of directional actuators. The active stiffening and active compensation effects are low in moderately thick piezo-hygro-thermo-elastic plates and shells, which are less influenced by boundary conditions

Item Type: Journal Article
Uncontrolled Keywords: Piezo-hygro-thermo-elastic;Geometric stiffness
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
Division/Department: Experimental Aerodynamics Division, Other, Other, Other, Other
Depositing User: M/S ICAST NAL
Date Deposited: 22 Mar 2007
Last Modified: 24 May 2010 09:54
URI: http://nal-ir.nal.res.in/id/eprint/4062

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