Ajoy Kumar Das
Civil Structural Engineer – Need a job immediately
Civil Structural Engineer with more than five years of industrial experience in design and analysis of steel and reinforced concrete structures that include industrial/commercial buildings, offshore subsea structures, bridges, foundations, and special structures such as lowering wells (stacking tubes), machine foundations, and chimneys.
Worked as a specialist engineer in the Oil&Gas industry and developed many transferable skills such as time and frequency domain dynamic analyses, fatigue and fracture, soil modeling, nonlinear analysis simulation, contact simulation, impact damage assessment, subsea structural monitoring, and commercial software development process.
Developed two vibration-based Structural Health Monitoring (SHM) procedures by combining my background in structural engineering, finite element modeling, structural dynamics, uncertainty concepts, signal processing and Kalman procedures and published many articles.
In-depth background in structural forensic engineering, damage assessment, and strengthening of existing buildings, houses and historical constructions such as churches, and cathedrals.
Hands-on experience in FEA software packages, STAAD, SAP, ANSYS, ABAQUS CAE, DIANA, NASTRAN, COMET, Hypermesh, and GiD.
PE license is expected in April, 2016.
Houston, TX 77084
Senior Specialist – Structural Engineering Wood Group Kenny Houston, TX
January 2013 to September 2015
Design and Analysis of Oil&Gas Energy Infrastructure €“ Performed global hydrodynamic analyses (linear and nonlinear) of a variety of Oil&Gas energy structures such as deepwater risers (SCR, SLWR, and TTR), pipelines, and mooring lines. The analyses entailed conducting finite element analysis (FEA) of the entire systems in order to determine dynamic responses of the systems. Dynamic loads included waves, currents, vortex induced vibration (VIV), and vessel motions. The purposes of the analyses were to determine design loads of the individual components in the systems and fatigue loading on the same components.
Structural Sensing, Vibration Measurements, and Design Validation €“ Conceptualized a big data processing tool in MATLAB for the design validation, condition evaluation, and monitoring of marine risers and wellheads. The tool takes low-frequency vibration measurements in terms of acceleration and angular rate as inputs and performs a series of steps comprising of determination of frequency contents using PSD plots, removal of DC bias, low-frequency trends and high-frequency noise, data transformation from local to global coordinate system, numerical integration to calculate displacements, and finally provides fatigue damage accumulations as the outputs.
FEA-based Structural Modeling and Thermal Analysis €“ Developed a FEA-based heat transfer model in ABAQUS for a manifold piping system with multiple possible entry locations of hot fluid and checked if temperature at a specified slot will remain below the rating temperature during hydrate remediation process.
Complex Non-linear Analysis and Code Development €“ Implemented synthetic mooring line analysis capability within a commercial software Flexcom, written in FORTRAN. Synthetic polymer ropes exhibit distinct behavior depending on the type of loading they undergo. The rope exhibits a non-linear load-elongation behavior that is dependent on mean load, load range, temperature, rate of loading and load history. I also performed unit testing, verification and validation exercise to check the correctness of the implementation and to ensure that no glitch has been introduced in other areas of the code. I implemented the keywords in the GUI using XML.
R&D Validation of Mooring Analysis Capability €“ Validated the mooring line analysis capability of Flexcom by comparing static and dynamic analyses results with hand calculation and AQWA results. Built a mooring system model in Flexcom, performed initial static analysis, obtained mooring system stable configuration, calculated vertical deflection of the floating body, and computed effective tension and laid length of the mooring lines. Performed static restart analysis considering wind, second order wave and current, and calculated floating body static offset and mooring line tensions. Performed time-domain dynamic analysis considering random waves and calculated floating body dynamic offset and dynamic line tensions.
Research Associate – Structural Engineering University of Arizona Tucson, AZ
August 2008 to December 2012
Vibration Testing, Response Measurements, and Structural Health Monitoring €“ Conducted multidisciplinary R&D to conceptualize and develop novel nondestructive procedures for the health monitoring of new or existing structure and machinery that can be represented as a dynamic system. The procedures calculate the stiffness of all the elements in the finite element based dynamic system model by using the noise-contaminated uncertain vibration responses measured during vibration testing. First, the responses are post-processed using a series of steps comprising of determination frequency contents using PSD plots, removal of DC bias, low-frequency trends and high-frequency noise, and physics-based numerical integration to obtain velocity and displacement responses. At the second step, using the finite element based dynamic model and Kalman filter-based advanced data processing technology, all the stiffnesses are identified. Reduction of stiffness of element(s) indicates structural damage.
Research Associate – Structural Engineering University of Minho, Guimaraes, Portugal and Technical University of Catalonia, Barcelona, Spain
October 2007 to July 2008
Forensic Inspection, Failure Analysis, and Structural Condition Assessment €“ Conducted field visits and forensic investigation for existing buildings, churches and cathedrals built of concrete, wood, and masonry where I took detailed investigation notes and photographs on the geometry, existing damages, cracks, past alterations, water intrusions, roof damage, and construction defects. Built detailed analysis models based on available drawings and field notes and analyzed applying engineering principles and practices to determine the overall structural integrity, building system damages, foundation settlements, and identified cause, origin and extent of structural failures.
FEA Modeling and Assessment of Safety of a Historical Masonry Structure: Constructed FEA model of a single bay of Mallorca Cathedral, a historical masonry structure built between 1300 and 1601 AD. Used 4-node tetrahedral elements for 3D macro-modeling and meshing of the geometry. Designed smooth transition between small to large elements with the help of transitional elements in order to capture continuity of stresses and strains at critical areas where damage/crack or material crushing was expected. Modeled nonlinear constitutive behavior of all the constituent materials based on a tension-compression distributed damage model. Performed nonlinear static analyses considering static vertical and lateral loading applied step by step until collapse. Assessed lateral load carrying capacity of the cathedral based on Capacity Spectrum Method (CSM), satisfying the site-specific demand seismic acceleration spectrum.
Assistant Engineer – Civil Structural Engineering M. N. Dastur and Company (P) Ltd. Kolkata, West Bengal
August 2005 to October 2007
Design and Analysis of Industrial Buildings €“ Performed design and global structural analysis of many industrial buildings and structures related to process engineering and material handling projects. The analyses entailed conducting finite element analysis (FEA) of the entire systems under static and dynamic loads. For all the projects, I performed feasibility study, developed and reviewed design basis, executed analysis, performed detailed design ensuring conformance with engineering design standards (such as IBC, ASCE, ACI, AISC, ANSI, ASTM, and AASHTO), prepared design engineering reports, developed design sketches, oversaw CAD designers for preparing construction drawings in AutoCAD, provided subsequent drawing markups, and back checked work for accuracy. Some challenging projects included the design of a lowering well (stacking tube), a chimney, and an equipment foundation.
PhD Structural Engineering University of Arizona
2008 to 2012
MS Structural Engineering University of Minho, Guimaraes, Portugal and Technical University of Catalonia, Barcelona, Spain
2007 to 2008
BS Civil Engineering Bengal Engineering and Science University
Shibpur, West Bengal
2001 to 2005
Following are some awards I have received:
Certificate of Achievement as Graduate Teaching Assistant, College of Engineering, University of Arizona, 2010.
Outstanding Teaching Assistant Award, Department of Civil Engineering and Engineering Mechanics, University of Arizona, 2010.
Delbert R. Lewis Graduate Scholarship, Department of Civil Engineering and Engineering Mechanics, University of Arizona, 2009, 2011.
Graduate Research and Teaching Assistantship, Department of Civil Engineering and Engineering Mechanics, University of Arizona, 2008 €“ 2012.
European Erasmus Mundus Masters Scholarship, European Commission, 2007.
University Medal and Ajay Kumar Dasgupta Memorial Medal for securing first position among the candidates of the Bachelor of Engineering in Civil Engineering, Bengal Engineering and Science University, 2005.
Professional Engineer (PE)
Published a total of 20 (9 journal, 9 conference, and 2 book chapters) articles.
Das, A. K. and Haldar, A. (2015), €œIssues on Structural Health Assessment and Monitoring under Measurement Uncertainty and Nonlinearity,€� SRESA€™s International Journal of Life Cycle Reliability and Safety Engineering, Special Issue on Prognostics & Structuring Health Management, Vol. 4, Issue 2, pp. 1-12.
Das, A. K., Balch, E., Fowler, S., Yiu, F., Beattie, M. (2014), €œDesign Validation of the Caesar-Tonga Steel Lazy-Wave Risers using Field Data,€� Manuscript 25349, Offshore Technology Conference, Houston, Texas, 5€“8 May.
Das, A. K., and Haldar, A. (2011), €œHealth Assessment of Structures Exposed to Seismic Excitation,€� ISET Journal of Earthquake Technology, Vol. 48, No.1, Paper No. 514, pp. 11-27.
Das, A. K., and Haldar, A. (2010), €œStructural Integrity Assessment under Uncertainty for Three Dimensional Offshore Structures,€� International Journal of Terraspace Science and Technology, Vol. 2, No. 2, pp. 101-111.
Das, A. K., and Haldar, A. (2010), €œStructural Health Assessment of Truss-type Bridges using Noise-Contaminated Uncertain Dynamic Response Information,€� International Journal of Engineering under Uncertainty: Hazards, Assessment, and Mitigation, Vol. 2, No. 3-4, pp. 75-87.
Haldar, A. and Das, A. K. (2010), €œPrognosis of Structural Health – Nondestructive Methods,€� Special Issue on Prognostics and Health Management (PHM), International Journal of Performability Engineering, Vol. 6, No. 5, pp. 487-498.
Additional articles will be available upon request.
Structural Design and Analysis | Steel, Concrete, Wood and Masonry | Load Calculation | AutoCAD Drawing | Dynamics and Vibration | Finite Element Analysis (FEA) | Material Constitutive Model | Linear and Nonlinear Analyses | Stress Analysis | Failure Analysis | Fatigue Life Calculation | Probability, Risk and Reliability | Data Mining | Signal Processing | Pattern Recognition | Physics-based Mathematical Modeling | Structural Monitoring | Kalman Filters | Design Optimization | Numerical Simulations | Software Development | FORTRAN | C | C++ | Java | MATLAB | MATHEMATICA | UNIX | Visual Studio | STAAD | ANSYS | ABAQUS | DIANA | NASTRAN | COMET | Hypermesh | GiD
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