Showing papers by "Kodakkal Kannan Viswanathan published in 2019"

Vibration of symmetrically layered angle-ply cylindrical shells filled with fluid

Abstract: Vibrational behaviour of symmetric angle-ply layered circular cylindrical shell filled with quiescent fluid is presented. The equations of motion of cylindrical shell in terms of stress and moment resultants are derived from the first order shear deformation theory. Irrotational of inviscid fluid are expressed as the wave equation. These two equations are coupled. Strain-displacement relations and stress-strain relations are adopted into the equations of motion to obtain the differential equations with displacements and rotational functions. A system of ordinary differential equation is obtained in one variable by assuming the functions in separable form. Spline of order three is applied to approximate the displacement and rotational functions, together with boundary conditions, to get a generalised eigenvalue problem. The eigenvalue problem is solved for eigen frequency parameter and associate eigenvectors of spline coefficients. The study of frequency parameters are analysed using the parameters the thickness ratio, length ratio, angle-ply, properties of material and number of layers under different boundary conditions.

Mathematical modeling of magneto rheological fluid damper in the semi-active suspension system

Abstract: Ride quality is concerned with the sensation or feel of the passengers in the environment of a moving vehicle. High-speed vehicles including automobiles severely affect the occupants ride comfort and safety due to the vibration. This research aims to simulate the Bouc-Wen model and Modified Bouc-Wen model using suitable parameters taken from literature in MATLAB environment. The system of equations of the model is solved by using the numerical fourth-order Runge-Kutta method. The settlement time required for the suspension system of the vehicle reaches the stabilisation solved by usingBouc-Wen model is almost the same as that of the input of voltage 2V for the Modified Bouc-Wen model. Although the Bouc-Wen model is well suited for the numerical simulation, however it cannot reproduce the experimentally observed roll-off in the yield region for velocities with a small absolute value and an operational sign opposite to the sign of the acceleration. As for the Modified Bouc-Wen model, its magnetic fields strength that depends on the flow of current through the coil of the MRF damper can be varied. After solved this model by using the MATLAB program, voltage 2 V is found to be the best value as observed from the graphical output since the time settlement needed of the vehicle suspension system is the shortest.

Reliable Component Instance for Multi-tenant Software as a Service Application

Abstract: Multitenant Software as a Service (SaaS) applications provides high level of application customization, enhanced process flow and access control, using a shared instance of the application. Cloud reliability is complex due to its resource intricacy and massiveness. The proposed solution considers reliability of the application during design and runtime. A reliable application needs to acclimate dynamically to the conditions in the cloud to enhance the reliability of its service. Component Instance (CI) is dynamically created based on the application's load and placed at different availability zones to enhance the reliability of the application. The objective of the proposed solution is to minimize multi-tenant SaaS application reliability risk considering reliability score of datacenter server energy, server and network capacity. Our evaluation and discussions shows that the proposed reliable framework enhances the reliability of the application and reduces the application risk factor.