Sanjib Chowdhury

Built and analyzed AVL Excite 3D multi-body whole engine dynamic models - crankshaft stress calculation due to flywheel whirl, bearing durability analysis, analyses of gear trains, Piston Secondary motion and Liner cavitation analysis.

Single Point of Contact for QSK23 engine for the Analysis Group and guiding the analysts. Cross Functional Work with the UK and India analysis teams. Major Technical Projects - AVL Excite 3D multi-body whole engine dynamic models for (a) V60L and V45L for estimating the thrust bearing force analytically and correlate with the observation in the field. (b) Cam phaser bushing (QSK60L) using EHD, analysis of moving components.

Evaluation of AVL Excite multi-body dynamic simulation tool for whole engine simulation Benchmark works – Engine main bearing edge loading and cavitation analysis, flywheel wobble analysis, and crankshaft dynamic stress recovery; engine rig tests for main bearing seizure and frictional power loss calculation; bearing cavitation analysis; Idler Gear Bushing analysis; incorporation of Micro-Contact analysis tool so that the true surface topology can be used in the analysis.

Worked on the Technology Demonstration Guide, new feature in ANSYS to show the capability of ANSYS FEA software to handle advanced engineering analysis techniques. Took full responsibility on the creation of the following documents: (a) PSD analysis of Printed Circuit Board (PCB) assembly using residual vectors and modal superposition and, (b) Component mode synthesis (CMS) method for modal and harmonic analyses of automobile suspension assembly.

Developed a master vane to incorporate the features of the vanes in HP, IP, and LP stages of a typical steam turbine. Approximated the vane geometry with NURBS curves modeler, which has the highest flexibility while modeling the blade as a free form (or smooth) surface. Used C and Unigraphics APIs (ufunc).

Investigated theoretically and experimentally, the nonlinear dynamics of in-plane motion of a simple galloper for passive (no energy input), generally dissipative vertical galloping, as well as with energy injection in terms of velocity at the instance of inelastic collisions with the ground

Worked on InterOp3.x, a CAD product developed by Geometric Software for Spatial Corp., USA to translate the CAD data (geometric and topological data) from one CAD file format or kernel to another. Maintained and enhanced the Parasolid-Acis component, which involves improving the success rate on test files and customer bug fixes. Used Rational Purifier as well as the testing tool developed by Spatial for fixing memory leaks. Got exposure in terms of domain knowledge (CAD) and developing C++ expertise.

Attended extensive in-house training programs on software development using C, C++, Unix, Oracle 8i, Java, VB, and Unix shell programming. Gained knowledge of SEI-CMM processes

Ph. D. Thesis: “Effect of Shaft Vibration on the Dynamics of Gear and Belt Drives”. Courses: Vibrations of Discrete Systems, Vibrations of Continuous Systems, Analytical Dynamics, Introduction to Continuum Mechanics,Nonlinear Vibrations, and Advanced Engineering Dynamics.

Thesis: “Computer Aided Design of Interference Free Planar Mechanisms” -Determined the `swept areas’ of the joints of the other links as well as the links in the same layer with respect to the reference link as well as the `feasible geometry’ for the reference link.

Core Mechanical Engineering Courses and Lab works. Additional: Solar Energy, Gas Turbine. Projects include designing of a Capstan Lathe.