RESUME

MAIN AREA OF INTERESTS:

3-D PARAMETRIC SOLID/SURFACE MODEING OF COMPLEX MECHANICAL SYSTEMS USING VARIOUS CAD/CAE/CAM PACKAGES

ADVANCED SIMULATIONS OF LINEAR/NON-LINEAR STRUCTURAL PHENOMENON USING FEM

DEVELOPMENT OF THE COMPUTER PROGRAMS TO SOLVE STRUCTURAL SYSTEMS USING BOTH CLASSICAL & NUMERICAL APPROACHES SUCH AS, FINITE DIFFERENCE, FINITE STRIP, FINITE ELEMENT METHOD, etc.

MODELING, SIMULATION & DESIGN REVIEW OF COMPLETE SHIP/OFFSHORE STRUCTURES AND THEIR COMPONENTS

COMPLEX LIFTING SIMULATIONS

OPTIMIZATION, ADAPTIVE MESHING OF STRUCTURES

SYSTEM ADMINISTRATION

Research Works in Ph.D. :

Title of the Ph.D. Thesis: Finite Element Static and Dynamic Analyses of Arbitrary Stiffened Shells

Abstract:

An arbitrary shaped higher order triangular isotropic stiffened shallow shell element (C² Continuity) of 36 d.o.f. has been developed for the finite element analysis of arbitrary stiffened plate and shell structures. The main elegance of the formulation lies in catering the arbitrary positioning of the stiffeners within the shell element and the automatic mesh generation scheme is independent on the alignment of the stiffeners in the stiffened plate and shell structures. The formulation is also extended to include the quadratic variation of the thickness of the shell element and the depth of the stiffener. This formulation is also applied to study the behaviour of arbitrary non-uniform shells stiffened by stiffeners of variable depths under different situations. The following analyses have been carried out on stiffened plate/shell structures:

a) Static analysis, b) Free vibration analysis, c) Transient dynamic response analysis, d) Random response analysis under stochastic white and jet noise excitation, e) Impact dynamics

Research Works in M.E. :

Title of the M.E. Thesis: Dynamic response of multi-storeyed building frames considering flexibility of beams and axial shortening of columns having irregular spacing

Abstract:

The Direct Stiffness Approach and the Finite Element Method have been employed for the free and forced vibration analysis of the plane and space frames having irregular positioning of columns. Only lateral degrees of freedom have been retained and others are condensed out by the Static Condensation Method. Forces and moments at the nodes and base shears of the RCC structure along with the natural frequencies and mode shapes for various modes have been compared with those obtained from different methods. The computer code in FORTRAN 77 developed has the capability for the static and dynamic analysis (including wind and seismic loading) of any number of storeyed buildings depending upon the core memory of the computer system in which it is to be compiled and run.

Research Works in the Project, with M. Tech. & Ph.D. Students of various Departments at I.I.T., Kharagpur :

Development of the computer program for the ship surface generation by Cubic B-Spline

Literature Review of the Shell Finite Elements

Development and subsequent computer coding of the following shell elements:

A doubly curved triangular isoparametric shell element (30 d.o.f.)
A new 18 d.o.f. shallow shell element combining the DKT and LST with drilling d.o.f.
A new 18 d.o.f. stiffened shallow shell element for static, dynamic & impact analysis of both concentric and eccentric stiffened plates/shells
A new 9-Noded Lagrangian shallow shell element for the free vibration analysis of rotating turbine blades

Finite element analysis of folded plates, shell, stiffened hollow box-beam and Crane like structures

A rigorous finite element static analysis of a full ship from 3-D point of view

Development of fluid finite element for the free vibration study of submerged stiffened plates

Extraction of eigenvalues of the thermally stressed spinning plates/shells