Effect of Rudder Size and Location on the Turning Performance of a High Speed SWATH Ferry

Varyani, K.S.; Krishnankutty, P.; McGregor, R. C.

doi:10.1016/s1474-6670(17)37784-4

Cited by 1 publication

(2 citation statements)

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“…As shown, the average heading rate decreases as the size of stern control surfaces increases. Although this observation may appear counter-intuitive, it is in agreement with theoretical predictions [9][10][11]. The stability index of the vehicle, C, computed by solving equation ( 16), when it is outfitted with the 1.0× control surfaces (978 mm 2 ) was −18.55, and this value increased to −3.87, and then to +24.92 when the AUV is outfitted with 1.5× and 2.0× control surfaces, respectively.…”

Section: Effects Of the Size Of Stern Control Surfacessupporting

confidence: 87%

“…It should be noted, however, that the mere presence of the rudder increases the stability index of the vehicle, and the effect of this increase may be typically larger than the increment of the turning moment it provides, so the overall effect on maneuverability is often negative. This property is well documented [9][10][11], and theoretically as well as experimentally proved in this paper.…”

Section: Introductionsupporting

confidence: 77%

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Bioinspired morphing fins to provide optimal maneuverability, stability, and response to turbulence in rigid hull AUVs

Randeni¹,

Mellin²,

Sacarny³

et al. 2022

Bioinspir. Biomim.

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By adopting bioinspired morphing fins, we demonstrate how to achieve good directional stability, exceptional maneuverability, and minimal adverse response to turbulent flow, properties that are highly desirable for rigid hull AUVs, but are presently difficult to achieve because they impose contradictory requirements. We outline the theory and design for switching between operating with sufficient stability that ensures a steady course in the presence of disturbances, with low corrective control action; reverting to high maneuverability to execute very rapid course and depth changes, improving turning rate by 25% up to 50%; and ensuring at all times that angular responses to external turbulence are minimized. We then demonstrate the developments through tests on a 1 m long autonomous underwater vehicle, named Morpheus. The vehicle is capable of dynamically changing its stability-maneuverability qualities by using tuna-inspired morphing fins, which can be deployed, deflected and retracted, as needed. A series of free-swimming experiments and maneuvering simulations, combined with mathematical analysis, led to the design of optimal retractable morphing fins.

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Section: Effects Of the Size Of Stern Control Surfacessupporting

confidence: 87%

Section: Introductionsupporting

confidence: 77%