This paper presents the response characteristics and manoeuvrability of a small twin screw displacement hull vessel quantified through a series of full-scale trials conducted in different environmental conditions. The 20 m test vessel is instrumented with actuator, environmental and motion sensors. Several different manoeuvres are performed at different speeds, including steady manoeuvres with constant control input and transient manoeuvres with varied control input to quantify and characterize the response of small vessels to aid in automatic controller and simulation development. Straight-line runs are performed in both forward and reverse over the entire operating range of the test vessel to investigate the relationship between throttle position, RPM and surge velocity. Turning manoeuvres are conducted over the achievable rudder deflection range to quantify the vessels turning radius and the relationships with surge, sway and rotational speed. Other manoeuvres include stationary rotation with the engines operating in opposite gears, and transient tests when the vessel is rapidly accelerated and decelerated. These actuator tests not only quantify the response of the actuators, but also set guidelines for the minimum dwell times that should be observed when shifting gears. These data found using a comprehensive sensor suite provide valuable benchmarks for several manoeuvres that can be used for simulation validation and the actuator response information provides valuable set points and performance characteristics/limitations that should be considered in control development. The data from these tests were repeatable from run to run and thus, with sufficient instruments, at sea manoeuvres can be used to collect a comprehensive set of data that can expand on data collected in tow tests.
Response characteristics and manoeuvrability of a small twin screw displacement hull vessel in seas
Taylor & Francis, Jeom Kee Paik and the Editorial Board of Ships and Offshore Structures are delighted to announce that the following paper has been awarded the 2008 Best Paper Award:
Ships and Offshore Structures ; 4 , 1 ; 1
2009-02-05
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Response characteristics and maneuverability of a small twin screw displacement hull vessel in seas
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