Resistance tests in calm water conditions provide performance predictions of ships in an ideal sea state, which can be found only in sea trials under particular condition. Evaluation of ship resistance in realistic sea condition, or so called added resistance in waves is gaining an increasing importance of scientific community. Determination of additional power (Sea Margin) to install above the calm water power requirements in displacement ship design is becoming very important issue for design and service. The purpose of this paper is to present towing tank methodologies and procedures for assessment of ship’s added resistance. ITTC Seakeeping Committee indicate two possibilities: tests in regular waves and tests in irregular sea but also comments on precision of procedure, identifying the regular waves procedure more accurate. This work starts from ITTC guidelines and procedures applying them for two different ship types. One is a tanker model tested in regular and irregular sea to get the information on precision limit according to the ITTC. Another model is fast monohedral planing hull where only regular waves approach can be applied. For both models preliminary calm water resistance tests are carried out before the tests in regular waves. Results and conclusion are given commenting on the towing tank instruments, procedure and model set-up.

Added resistance determination in regular sea according to ITTC recommendation / Begovic, Ermina; Bove, Andrea; P., Fusco; Miranda, Salvatore. - 1:(2012), pp. 101-102. (Intervento presentato al convegno NAV 2012 tenutosi a Napoli nel 17 - 19 October 2012).

Added resistance determination in regular sea according to ITTC recommendation

BEGOVIC, ERMINA;BOVE, ANDREA;MIRANDA, SALVATORE
2012

Abstract

Resistance tests in calm water conditions provide performance predictions of ships in an ideal sea state, which can be found only in sea trials under particular condition. Evaluation of ship resistance in realistic sea condition, or so called added resistance in waves is gaining an increasing importance of scientific community. Determination of additional power (Sea Margin) to install above the calm water power requirements in displacement ship design is becoming very important issue for design and service. The purpose of this paper is to present towing tank methodologies and procedures for assessment of ship’s added resistance. ITTC Seakeeping Committee indicate two possibilities: tests in regular waves and tests in irregular sea but also comments on precision of procedure, identifying the regular waves procedure more accurate. This work starts from ITTC guidelines and procedures applying them for two different ship types. One is a tanker model tested in regular and irregular sea to get the information on precision limit according to the ITTC. Another model is fast monohedral planing hull where only regular waves approach can be applied. For both models preliminary calm water resistance tests are carried out before the tests in regular waves. Results and conclusion are given commenting on the towing tank instruments, procedure and model set-up.
2012
9788890439445
Added resistance determination in regular sea according to ITTC recommendation / Begovic, Ermina; Bove, Andrea; P., Fusco; Miranda, Salvatore. - 1:(2012), pp. 101-102. (Intervento presentato al convegno NAV 2012 tenutosi a Napoli nel 17 - 19 October 2012).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/510069
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