Saturday, September 10, 2016

My Research Group in IIT KGP 2011-16

       Unusual as it may sound, my research group in IIT KGP during 2011-2015 has been primarily undergraduate students. As explained at the end of my other blog, my signature subject Vibration of Floating Structures has 10% of the grade from a Group Term Paper. The topics are more advanced than the course material, leading to open-ended problems. The student gets a first taste of the scientific research process. This motivates a few students to further their curiosity to solve more difficult problems. Now it is no longer isolated technical exercises : it is research. It is putting one's idea in the correct perspective of recent research. It is tallying oneself with existing research and learning to put forth one's novelty. It is rigorous comparative studies. The Term Paper process (2011-2015) has motivated a handful of bright students to work with me through their B.Tech and M.Tech Projects.

Mr. Joseph Davis Thekinen
Dual Degree 2009-2014, PhD in Mechanical Engg, Purdue University (2014-18)
   
He applied the Rayleigh-Ritz method to study hull-girder vibration, as opposed to the computationally demanding Finite Element Method. He studied both vertical vibration of closed-section tanker hulls, and coupled horizontal-torsional-warping vibration of open-section containership hulls. He also worked on floating airport response under aircraft landing loads. He won the best M.Tech project in April 2014.
Outdoor : Presented his work in MARTEC Oct 2012 in Malaysia, with partial institute funding. I presented his work at ACMFMS 2012 (IIT Delhi) and at OMAE2013 (Nantes, France, June 2013)
  • N.Datta and J.D. Thekinen, “Response spectrum of non-uniform mathematical hull girder springing to deep water random seas with forward speeds”, 8th International Conference in Marine Technology, Malaysia, in October 2012.
  • N.Datta and J.D. Thekinen, “Higher-order dry and wet natural frequencies and modeshapes of rectangular Kirchhoff’s plate vibration”, ACMFMS,  IIT Delhi, December 2012.
  • N.Datta and J.D.Thekinen, “Wet vibration of axially loaded elastically supported plates to moving loads : aircraft landing on floating airports”, 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2013), Nantes, France, June 2013.
  • Datta, N. and Thekinen, J. D.,A Rayleigh-Ritz based approach to characterize the vertical vibration of non-uniform hull girder”, Ocean Engineering Vol 125(2016), 113-123.

Next plan : Wet vibration analysis of the above modes of hull girder vibration using rectellispes.
Journal papers : accepted (1), under review (1).
Conference papers : 3

Mr Mohd. Atif Siddiqui 
Dual Degree 2009-2014, PhD in Marine Technology, NTNU, Norway (2014-18)
     
He studied the hydroelastic interaction of axially loaded Timoshenko beams (with non-classical end-fixities) to hydrodynamic slamming-induced transient loads. This involves the two-way coupling between slamming hydrodynamic pressure and the elastic behaviour of the continuously-changing wetted surface. 
Earlier, he has studied this problem from the 1-way coupled interaction perspective for axially loaded Mindlin's plates (with non-classical boundary conditions).
Outdoor : Presented his work on 1-way coupling dynamics of axially loaded Timoshenko beam in SCEE May 2013 in Malaysia. I presented his work at OMAE2013 (Nantes, France, June 2013) : video here.

  • N.Datta and Md. Atif Siddiqui, “Dynamic response of axially loaded Timoshenko beams with intermediate fixities to repeated transient hydrodynamic impact loads”, 2nd International Conference on Advances in Structural, Civil and Environmental Engineering (SCEE - 2013), Kuala Lumpur, Malaysia, May, 2013.
  • N.Datta and Md. Atif Siddiqui, “Dynamic response of axially loaded plates with intermediate fixities to transient hydrodynamic impact loads”, 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2013), Nantes, France, June 2013. 
Next plan : Study of the asymptotic behavior of fluid radiation forces (added mass and damping) vs. the changing wetted surface beyond the length of the beam, to approach the deeply submerged free vibration behavior.
Journal papers : accepted (1), under construction (1).
Conference papers : 2

Mr. Ankit
Dual Degree 2010-2015, currently in Cybermarine, Navi Mumbai, India.
    
He studied a compliant ocean tower modeled as a non-uniform Timoshenko beam, with a tip mass (modelling the superstructure), non-classical base (modelling the soil foundation); subject to wave and earthquake loads. The fluid radiation pressures were included in the axially loaded Timoshenko beam. Rayleigh-Ritz method was used and verified with FEA for the free vibration study. Parametric studies were done for the soil-structure interaction of non-classical base ocean tower as well as mono-piled ocean tower. He won the Best M.Tech project in April 2015. Presentation video here.
Outdoor : presented his work at OMAE2014 (June 2014) in San Francisco, USA; with full Institute funding.

  • N. Datta and Ankit, “Forced damped wet vibration analysis of an idealized compliant tower in the Indian Ocean, with superstructure due to current loads, wave excitation, and earthquake impulses”, Proceedings of the 33rd International Conference on Ocean, Offshore and Polar Engineering (OMAE2014), San Francisco, CA, USA, June 8-13, 2014.
  • Ankit and Datta, N., "Free transverse vibration of ocean tower", Ocean Engineering , Vol 107 (2015) 271–282.
  • Ankit, Datta, N. and Kannamwar, A. N., “Free transverse vibration of mono-piled ocean tower”, Ocean Engineering 116 (2016) 117–128.
Journal papers : accepted (2), under review (1), submitted (1)
Conference papers : 1
Teaching Asst : Autumn 2014

Mr. Ameya N Kannamwar
Dual Degree 2010-2015, currently Asst. Surveyor, Indian Register of Shipping, Mumbai, India.
   
He is the first experimentalist of our group. He studied the dry and wet vibration of a 1 metre span aerofoil wing, through the impact hammer test. The dry vibration test was done in the Structural Dynamic Lab, Dept. of Aerospace Engg, IIT KGP (courtesy Prof. D. K. Maity). The wet vibration test was done in the tank of Prof. A.K. Mohanty's Laboratory, Dept. of Mechanical Engg. He also did the numerical analysis of both the experiments for verification.
He won the best B.Tech project in April 2014. MTP presentation video here.
Outdoor : Presented his work at SNAME Maritime Convention, Oct 2014, at Houston USA; with full institute funding. This paper won the Elmer Hann Award 2015. Video here
  • N. Datta and A.N. Kannamwar, “Free vibration of marine rudder: theoretical and numerical analysis with experimental verification”, SNAME Maritime Convention, Houston, Texas, USA, Oct 20-25, 2014.
Forced vibration of the rudder, behind a rotating propeller downwash, was conducted at the Naval Science and Technology (NSTL), DRDO, Visakhapatnam; courtesy scientists Mr. Manu Korulla and Mr. P.C. Praveen. Mr. Kannamwar was assisted by Mr. Rahul Jindal.
Journal papers : under review (1), under construction (1)
Conference papers : 1
Teaching Asst : Autumn 2014

Mr. Rahul Jindal
B.Tech 2011-2015, currently Asst. Surveyor, Indian Register of Shipping, Mumbai, India.
    
He complicated Mr. Kannamwar's wing analysis to the rudder vibration analysis, using Galerkin's method of two-way tapered plate vibration analysis, which has a non-classical pivot. He further studied the propeller-induced vibration of the rudder.
Outdoor : Presented his work at OMAE2015 (June) in St.Johns, Canada; with full institute funding. 
Video here.
  • N. Datta and R. Jindal, “Free dry and wet vibration of 2-way tapered hollow marine rudder with non-classical pivot : theoretical study” , Proceedings of the 34th International Conference on Ocean, Offshore and Polar Engineering (OMAE2015), St. John’s, Newfoundland, Canada, May 31-June 5, 2015.
  • N. Datta and R. Jindal, “Wake-induced flutter of 2-way tapered hollow stiffened marine spade rudder in non-uniform propeller slipstream”, 22nd International Congress on Sound and Vibration (ICSV22), Florence, Italy, from 12 to 16 July 2015
I presented his work at ICSV22 (July 2015), Florence, Italy, which included propeller-induced vibration analysis of the rudder. Video here.
Journal papers : under construction (1)
Conference papers : 1
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Group meetings

Fortnightly group meeting have been a regular feature since Autumn 2013. Students present their progress before the group for feedback and further brainstorming.
   

Once the undergraduate students finished their projects as per the curriculum (June 2015), the graduate students stepped in.

Mr. Yogesh Verma (PhD 2014-2018)
He has been studying Mindlin's plates with non-classical boundary conditions, concentrating on theoretical efficacy of free vibration analysis through accuracy of admissible functions into the energy-based Rayleigh-Ritz method. This includes rigid-body modes of plates with free edges.
He has supported me in the re-opening of the Vibration lab of the department, which lay defunct for 8 years. Dry and wet plate vibration impact hammer tests were conducted.

Journal papers : Accepted (1), Under review (2)
Teaching Asst : Autumn 2015-Autumn 2016

Mr. L.S. Lingesh
2-yr Mech 2014-16, currently Asst. Surveyor, Indian Register of Shipping, Mumbai, India.
   
The second experimentalist of our group, who set up a spring-suspension cylinder model for capturing vortex-induced vibration (VIV). It was supported by the dept workshop and was conducted in the Circulation Channel (Courtesy Prof N. Vishwanath) of the Dept. of Ocean Engineering and Naval Architecture, IIT Kharagpur. For a cylinder diameter of 38 mm, the VIV amplitude was approximately 20 mm. VIV video here. Presentation video here.

Teaching Asst : Autumn 2015-Spring 2016


Mr. Mohd. Ishityak (2-year M.Tech 2015-2017)
  
He is continuing the work of his predecessor, Mr. L.S. Lingesh, in an attempt to achieve VIV-locking. A sinosoidal locking of the cylinder oscillation with the vortex-shedding will pave the way for energy extraction. 



Autumn 2016 : A hollow PVC cylinder 60 cm long and 6 cm in diameter, named Spandana-060-06, achieved vortex-induced vibration lock-in, at current speed of 0.29 m/sec. An amplitude of 5 cm was achieved, with a steady sinosoidal behaviour. The videos are here : 
https://www.youtube.com/watch?v=DNykTGpWNbY

M.Tech Project Autumn Seminar video link 

Winter 2016 : Spandana-090-10 work begins.
Spring 2017 : A hollow PVC cylinder 92 cm long and 10 cm in diameter, named Spandana-090-10, achieved vortex-induced vibration lock-in, at current speed of 0.38 m/sec. An amplitude of 10 cm was achieved, with a steady sinosoidal behaviour. The video is here:
https://www.youtube.com/watch?v=yvA7ZWuzd34


Teaching Asst : Autumn 2016
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