Work Experience

Synopsis of my work experience
Prajwal Nimmagadda
Graduate Research Assistant
Dept of Mechanical Engg
University of North Carolina at Charlotte

Overview
About me
My individual projects since 2003
Undergrad intern project
Undergrad final year project
Work at Industry, in India
Research Work at UNC Charlotte,NC USA
August 2006

Who am I ?
Master’s Research Student at the University of North Carolina at Charlotte
Majoring in Mechanical Engineering (GPA:3.43)
Design and Analysis
Worked on Pro-E and ANSYS also on MSC Nastran from August 2004
Theoretical and working knowledge of Finite Element Methods/Analysis
Current Research
Haptic Feedback control: Haptic feedback system to reduce the probability of rollover in a heavy truck through induced steering wheel vibrations

Undergraduate intern project
Developed a repositioning mechanism for a toppled hexapod (a six legged robot)
Involved use of rack and pinion mechanism on either
ends to do the repositioning
Making 180o, to and fro motion from a 360o rotating motor using linkage mechanisms.
Used C to achieve this motion and simulated it in C

Undergraduate final year project
STRUCTURAL ANALYSIS OF TRUCK CHASSIS FRAME USING FINITE ELEMENT ANALYSIS
Problem Definition : To perform structural analysis on a parametrically defined model of a truck frame, optimize the critical parameters.
Import to IGES format for exporting to MSC Patran
Imported to MSC Patran
Original 2-D drawings of truck chassis
3-D drawings and Assembly in Pro-E
Data Loss (missing surfaces) reconstructed in Patran
Meshing using Quad 4 elements and TRIA elements (Shell Elements)
Grouping of surfaces with similar thicknesses
Removal of holes reduces the stress concentration in regions of the frame
Applying Multi Point Constraints (to simulate the presence of Bolts)
Application of Loads and Boundary conditions
Solving using Nastran (Solver)
Post –Processing and Result analysis

Work at Industry
TASK I
During the first month of the stay, I assisted a PhD student from The University of Malaysia, Sabah on “Simulation of Piezo-Resistive Metal Gauge on Rectangular Membrane for Low Pressure Application”.
I was given a problem of a stress state on a thin membrane.
This required me to create a membrane of the order of a few microns and the membrane consisted of multiple layers of different materials. And on top of the membrane was a resistance strain gage which was again of much lesser dimension compared to the original membrane.
This resistance strain gage was made of another material. So, eventually there were more than 2 materials involved. The relative motion (sliding) between the gage and the membrane needed to be stopped by gluing them together, as the gage was placed to check the strain in the membrane.
Then the low pressure that needed to be applied was applied on the top surface of the membrane which consisted of the resistance gage. The strain developed in the gage was compared with the strain on the membrane.
And the results were given to the PhD scholar.

Schematic

Task II(Modal Analysis of Turret of a Battle Tank using Finite Element Analysis)
Gun positioning accuracy is very much dependent on turret structure and its stiffness
Solid Model
Turret
Gun Barrel
Finite Element Model
Number of Elements in Gun Barrel =
74000
Number of Elements in Gun Barrel =
175000
Number of Elements in Turret =
94000
Element Type = Structural Solid Tetrahedral

Task iii (Frequency Response of Gear Boxes)
Elevation Gear Box (For movement of Gun barrel vertically)
Traverse Gear Box (For swivel motion of the Turret in the Horizontal Plane)

Parallel Plate Capacitance Based Displacement Sensor
Geometric Model in Pro-E Wildfire
Concept
Testing the Final Manufactured Part
Results

Work Experience

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