The effect of the transverse curvature of planning hull on Longitudinal Stability

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NAJAFI AMIN; Alavi Mojtaba

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Journal: JOURNAL OF MECHANICAL ENGINEERING Year:2020 | Volume:50 | Issue:3 (92) Page(s): 259-266

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Title

The effect of the transverse curvature of planning hull on Longitudinal Stability

Author(s)

NAJAFI AMIN | Alavi Mojtaba | Issue Writer Certificate

Keywords

Longitudinal instability

transverse curvature

planning hull

Abstract

Due to the various applications of planning hulls, the demand for these floats has increased. One of the important goals in designing this category of boats is achieving higher speeds One of the factors preventing this, is the Longitudinal instability problem. In this regard, various methods have been proposed to prevent the occurrence of Longitudinal instability in the hull, including the addition of control elements such as the interceptors, the trimtab etc. The main disadvantages of using these elements are the maintenance and control of these elements As a result, if the vessel's Longitudinal instability solved in a way that does not need maintenance it will be useful and practical. In this research, a new method is proposed to solve vessel's Longitudinal instability. In this method, the vessel's instability has been removed using the transverse curvature. The numerical method has been used to investigate the effect of the transverse curvature of the hull. For validation of the numerical method, a planning hull resistance test in the towing tank has been used. Cogar hull is a hardchine single-hull planning hull with constant deadrise in stern. From the empirical tests parameters such as resistance, dynamical trim and center of gravity rise are obtained, which are also used to validate the numerical method. The final results are presented in the form of curvature effect on longtitudinal instability, resistance and dynamic trim for different input velocities. According to the results, the change in the curvature has a significant effect on Longitudinal instability.

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APA: Copy

NAJAFI, AMIN, & Alavi, Mojtaba. (2020). The effect of the transverse curvature of planning hull on Longitudinal Stability. JOURNAL OF MECHANICAL ENGINEERING, 50(3 (92) ), 259-266. SID. https://sid.ir/paper/269864/en

Vancouver: Copy

NAJAFI AMIN, Alavi Mojtaba. The effect of the transverse curvature of planning hull on Longitudinal Stability. JOURNAL OF MECHANICAL ENGINEERING[Internet]. 2020;50(3 (92) ):259-266. Available from: https://sid.ir/paper/269864/en

IEEE: Copy

AMIN NAJAFI, and Mojtaba Alavi, “The effect of the transverse curvature of planning hull on Longitudinal Stability,” JOURNAL OF MECHANICAL ENGINEERING, vol. 50, no. 3 (92) , pp. 259–266, 2020, [Online]. Available: https://sid.ir/paper/269864/en

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