Dr Chennakesava Kadapa's Qualifications (4)

Software Carpentry Instructor
Other Qualification

Status	Complete
Part Time	No
Years	2019
Project Description	Awarded for successfully completing the Software Carpentry instructor training program. Demonstrated the understanding of core pedagogical concepts and evidence-based teaching practices, and is qualified to teach Software Carpentry's core curriculum.
Awarding Institution	THE UNIVERSITY OF MANCHESTER

Bachelor of Technology in Mechanical Engineering
Bachelor's Degree

Status	Complete
Part Time	No
Years	2002 - 2006

Master of Technology in Machine Design
Master's Degree

Status	Complete
Part Time	No
Years	2006 - 2008
Project Title	Bifurcations and chaos in misaligned rotors with bearing clearances
Project Description	The increasing need for high-speed turbo-machinery has made it more stringent on requirements for the analysis of these systems more precisely and also by considering the effects those affect the performance of the system in a much hazardous manner. Among the major problems in rotor-bearing systems, shaft misalignment and rotor unbalance are the two important concerns, because they are always present, no matter how much care one takes to get rid of them. In the present work, Jeffcott rotor supported on piecewiselinear bearings has been considered and the effect of shaft misalignment is included as parametric excitation, which is modeled as axial force acting on the shaft. The system under study is modeled as a single degree of freedom (SDOF) model by considering the transverse vibrations of the disc only in plane. In this study, only the effects of parallel misalignment are taken into consideration. The governing equation of motion is solved analytically by using alternating frequency- time harmonic balance method (AFT-HBM) to gain some knowledge about the response of the system. Later, as the main motto of the present work is to investigate for the occurrence of bifurcations and chaos in rotorbearing systems due to the presence of shaft misalignment and unbalance simultaneously, the governing equation of motion is solved numerically using 4th order Runge-Kutta method, by varying the misalignment parameter values. The parameter regions where bifurcations and chaos occur are calculated for different values of rotor speed and unbalance. The response of the system is analyzed with the help of phase planes, Poincare maps and power spectrum. Then by calculation of Lyapunov exponents and Competitive Modes for some of the misalignment parameter values, the presence of chaotic behavior has been justified. Finally, the effect of stiffness ratio on the response of the system has been studied. Link: https://www.researchgate.net/publication/301691939_Bifurcations_and_chaos_in_misaligned_rotors_with_bearing_clearances

PhD in Mechanical Engineering
Doctorate

Status	Complete
Part Time	No
Years	2010 - 2013
Project Title	Mixed Galerkin and Least-Squares formulations for Isogeometric analysis
Project Description	This work is concerned with the use of isogeometric analysis based on NonUniform Rational B-Splines (NURBS) to develop efficient and robust numerical techniques to deal with the problems of incompressibility in the fields of solid and fluid mechanics. Towards this, two types of formulations, mixed Galerkin and least-squares, are studied. During the first phase of this work, mixed Galerkin formulations, in the context of isogeometric analysis, are presented. Two-field and three-field mixed variational formulations — in both small and large strains — are presented to obtain accurate numerical solutions for the problems modelled with nearly incompressible and elasto-plastic materials. Performance of these formulations is assessed by studying several benchmark examples. The ability of the mixed methods, to accurately compute limit loads for problems involving elasto-plastic material models; and to deal with volumetric locking, shear locking and severe mesh distortions in finite strains, is illustrated. Later, finite element formulations are developed by combining least-squares and isogeometric analysis. Least-squares finite element methods (LSFEMs) based on the use of governing differential equations directly — without the need to reduce them to equivalent lower-order systems — are developed for compressible and nearly incompressible elasticity in both the small and finite strain regimes; and incompressible Navier-Stokes. The merits of using GaussNewton scheme instead of Newton-Raphson method to solve the underlying nonlinear equations are presented. Advantages of using higher-order NURBS in obtaining optimal convergence rates for non-norm-equivalent LSFEMs; and the robustness of LSFEMs, for Navier-Stokes, in obtaining accurate numerical solutions without the need to incorporate any artificial stabilisation techniques, are demonstrated. Link: https://www.researchgate.net/publication/269705642_Mixed_Galerkin_and_Least-Squares_formulations_for_Isogeometric_analysis
Awarding Institution	Swansea University