Response of Dome-enclosed Box-type Structure to Underwater Explosion

  • O. R. Nandagopan Naval Physical & Oceanographic Laboratory, Kochi
  • Sameer Abdul Azeez Naval Physical & Oceanographic Laboratory, Kochi
  • C. G. Nandakumar Cochin University of Science & Technology, Kochi
DOI: https://doi.org/10.14429/dsj.63.2130
Keywords: Underwater explosion, sensor structure, structural response, shock wave

Abstract

In the development of underwater sensor systems, the sensor arrays are configured for different shapes like cylindrical, rectangular and spherical depending on the requirement. The rectangular shaped box–type structure discussed here has both top and bottom ends open. Flanges stiffen the top and bottom ends, and gussets are used to connect the flanges with the structure. In this paper, the box-type structure is subjected to non-contact underwater explosion in a shock tank to study the peak free field pressure on the structure. To simulate the actual conditions, the structure is placed in free flooded area and covered with a dome. The free-field peak pressure on the dome and structure are plotted with time. The measured pressure curves are in agreement with the empirical predictions reported in literature. It is concluded that around 85 per cent of the shock impulse acting on the dome is transmitted to the box-type structure. The dome and box-type structure withstood the explosive load, thereby validating their design.

Defence Science Journal, 2013, 63(4), pp.381-385, DOI:http://dx.doi.org/10.14429/dsj.63.2130

Author Biographies

O. R. Nandagopan, Naval Physical & Oceanographic Laboratory, Kochi
Dr O.R. Nandagopan obtained his PhD from Cochin University of Science & Technology, Kochi, presently working as a Scientist ‘G’ at Naval Physical & Oceanographic Laboratory (NPOL), Kochi. His area of specialization is underwater structures. His significant contributions are in the area of winches and handling systems for towed and dunking sonar systems for Indian Navy. Interested area of work is biomimicry and product realization.
Sameer Abdul Azeez, Naval Physical & Oceanographic Laboratory, Kochi
Mr Sameer Abdul Azeez obtained his MTech (Industrial Engg. & Mgmt.) from Indian Institute of Technology Kharagpur. Currently working as scientist at the Naval Physical and Oceanographic Laboratory (NPOL), Kochi. He has been working in the areas of design, analysis, simulation, development and testing of engineering subsystems of sonar systems for the Indian Navy. His major contributions are in the areas of airborne sonar systems and application of systems engineering concepts. His research interests include: Structural dynamics, machine design and systems engineering.
Published
2013-07-22
How to Cite
Nandagopan, O., Azeez, S., & Nandakumar, C. (2013). Response of Dome-enclosed Box-type Structure to Underwater Explosion. Defence Science Journal, 63(4), 381-385. https://doi.org/10.14429/dsj.63.2130
Issue
Vol 63 No 4
Section
Armaments & Explosives
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