16 Result(s)
within
Vishwanath Nagarajan
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Article
Exploring Seaweed-Associated Marine Microbes: Growth Impacts and Enzymatic Potential for Sustainable Resource Utilization
Seaweed, a valuable marine resource widely cultivated worldwide, can be vulnerable to stress and microbiome alterations, resulting in the decay of seaweeds and substantial economic losses. To investigate the s...
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Chapter and Conference Paper
Underwater Biomimetic Propulsion Using Coupled Structures
The flap** motion of caudal fin found in fishes like Mackerel, salmon and trout has been extensively studied for its excellent propulsion characteristics. Locomotion is generally achieved through the oscilla...
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Chapter and Conference Paper
Extended State Observer-Based Control of Underactuated Autonomous Underwater Vehicle in a Vertical Plane
In this paper, a control system is designed for a path following problem of a flight-type underactuated autonomous underwater vehicle (AUV) operating in a vertical plane. Initially, a guidance law is formulate...
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Article
Underwater Biomimetic Propulsion Using Coupled Structures
Fishes like Mackerel, salmon and trout have been a great inspiration for effective underwater propulsion. Their propulsion mechanism involves flap** the posterior body members. Fish actively modify the stiff...
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Article
Vibration analysis of cycloidal propeller blade during ship maneuvering
Marine cycloidal propeller (MCP) is well known for its maneuvering capability. It has unique kinematics. During operation, for each rotation of the propeller disc, each one of the blades undergoes one oscilla...
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Chapter and Conference Paper
Robust Path Following Control of Autonomous Underwater Vehicle Using Combined Time Delay Estimation and Backstep** Method
The present work addresses the nonlinear control problem for the path following of an autonomous underwater vehicle (AUV) by using the combined backstep** method and time delay estimation (TDE). The proposed...
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Article
Surface pressure measurements on a generic submarine hull form at high angles of incidence
To investigate the surface pressure distribution at high angles of incidence over a generic submarine hull form (SUBOFF), model tests were carried out for pressure measurements in the Wind Tunnel Facility at N...
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Article
PID-type controller for marine cycloidal propeller: a simulation study
The paper presents a methodology to design an electric controller for marine cycloidal propeller. The controller is designed considering the torque and the rotational speed limit of the motor. The influence of...
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Chapter and Conference Paper
Analysis of Sloshing in Tanks Using Image Processing
Sloshing is referred to as the violent movement of liquid in a partially filled tank that undergoes dynamic motion. There are several examples of such types of motions. In ships, sloshing motion occur in oil t...
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Article
Roll-induced bifurcation in ship maneuvering under model uncertainty
In this paper, a mathematical model is developed for the maneuvering motion of a naval ship and bifurcations of its equilibrium are identified in roll-coupled motion. The subject ship is a high-speed surface c...
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Article
Bifurcation analysis of a high-speed twin-propeller twin-rudder ship maneuvering model in roll-coupling motion
In this paper, bifurcation analysis of a high-speed twin-propeller twin-rudder ship maneuvering mathematical model has been carried out. Surge, sway, yaw, and roll are the degrees of freedom considered in the ...
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Article
Manoeuvring characteristics of twin-rudder systems: rudder-hull interaction effect on the manoeuvrability of twin-rudder ships
With a recent increase in ship capacity and propulsion performance, a wide-beam ship fitted with a twin-rudder system has been adopted in many cases. However, to improve ship manoeuvring, it is still necessary...
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Article
A proposal for propulsion performance prediction of a single-propeller twin-rudder ship
The influence of a rudder’s axial force on the prediction of full-scale powering performance of a ship is investigated in this paper. Axial force characteristics of different rudder types were investigated by ...
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Article
Mathematical model of single-propeller twin-rudder ship
A mathematical model of a single-propeller twin-rudder ship has been developed from captive and free running model experiments. An open water rudder experiment was carried out to figure out the characteristics...
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Article
Comparison of the mariner Schilling rudder and the mariner rudder for VLCCs in strong winds
A simulation model of a very large crude carrier (VLCC) with either a mariner type Schilling rudder or a mariner rudder was developed from captive and free-running model tests. Kijima’s regression formula was ...
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Article
A study on improving the course-kee** ability of a pure car carrier in windy conditions
The course-kee** ability of a pure car carrier (PCC) in windy conditions is discussed in this article. Numerical simulations of two PCCs were carried out to compare their course-kee** abilities in wind. Th...
