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Rajasekhar, D.
- Reliability Assessment and System Performance Improvement of ORV Sagar Nidhi Propulsion System
Abstract Views :158 |
PDF Views:73
Authors
D. Rajasekhar
1,
P. S. Deepak Sankar
1,
Anantha Krishna Rao
1,
D. Narendrakumar
1,
K. Ramasundaram
1
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN
Source
Current Science, Vol 118, No 11 (2020), Pagination: 1782-1785Abstract
Diesel-electric propulsion system offers many advantages to research ships, viz. economical, environment friendly, reliable, ease of operation and control, optimal manoeuvering and positioning, low vibration and noise levels. ORV Sagar Nidhi is equipped with diesel electric propulsion. The propulsion power is provided by azimuth thrusters which are driven by frequency controlled AC motors. The ship has dynamic positioning system for station keeping and better manoeuvering. During a scientific cruise, starboard azimuth thruster motor tripped due to zero resistance in winding, thereby reducing the propulsion power. Because there is no redundant motor available, vessel completed the voyage with single thruster. As a result of motor failure, propulsive power of the vessel was reduced drastically and the voyage plan had to be altered to match the ship schedule which resulted in skipping many sampling stations. In this article, the possible cause of thruster motor failure was analysed and remedial action was taken to rectify the same. This article also provides different solutions to improve the reliability of propulsion system and minimizing the downtime of vessel.Keywords
Azimuth Thruster, Dynamic Positioning, Redundancy, Reliability.Full Text
References
- Bonnett, A. H., Root cause AC motor failure analysis with a focus on shaft failures. IEEE Trans. Ind. Appl., 2000, 36(5).
- Qiao, C. Y. P. and Wang, C. S., A taxonomic study of fractograph assisted engineering materials failure analysis. In Maintenance and Reliability Conference, Knoxville, TN, 20–22 May 1997, p. 501.
- Cummings, P. G., Dunki-Jacobs, J. R. and Kerr, R. H., Protection of induction motors against unbalanced voltage operation. IEEE PCIC, PCIC-83-3, 1983.
- Nailen, R. L., New concept in rotor bar shape solves pipeline motor acceleration problem. In IEEE Summer Power Meeting, Paper 72CP527-PWR, 1972.
- Detection of Submerged Harbour Using GEBCO and Mbes MBES, in the Offshore Region of Ancient Port City Poompuhar, South India
Abstract Views :214 |
PDF Views:98
Authors
Affiliations
1 Department of Remote Sensing, Bharathidasan University, Tiruchirappalli 620 023, IN
2 National Institute of Ocean Technology, Velacherry–Tambaram Main Road, Pallikaranai, Chennai 600 100, IN
1 Department of Remote Sensing, Bharathidasan University, Tiruchirappalli 620 023, IN
2 National Institute of Ocean Technology, Velacherry–Tambaram Main Road, Pallikaranai, Chennai 600 100, IN
Source
Current Science, Vol 119, No 3 (2020), Pagination: 526-534Abstract
Similar to several ancient coastal/port cities of the world, the Indian subcontinent too had a number of them. The Poompuhar is one such port city established at the mouth of river Cauvery by the Chola dynasty 2000 years ago according to the literature and history. However, while later archaeological studies indicate its spread 20 km along the coast and up to 8 km inside the Bay of Bengal sea, the recent studies indicated its initial establishment over one of the Cauvery’s oldest deltas of 11,000-15,000-year-old at 30 km inside sea and the later shift to the present location. Now, the GEBCO-2019 and MBES based present study revealed the presence of a harbour and related structures in the above delta, resembling 6000-2000- year-old harbours of the world and the knowledge of the people in construction technology and marine environment.Keywords
Ancient Port City, Offshore Region, Seabed Topography, Submerged Harbour.Full Text