Mandate

Ad Hoc Panel #13 was approved at the May 1, 2002 meeting of the TR Steering Committee. This panel is the thirteenth in a series of ad hoc panels formed under the T&R Steering Committee banner. The key objectives of the new panel are to better identify sea and vessel characteristics that initiate this coupling of pitch and extreme rolling based on current data and to propose operational guidelines and navigational procedures for existing vessels to avoid or to reduce the effects of the phenomenon. One particular goal will be proposal of a suitable amendment to Maritime Safety Committee Circ.707, "Guidance to the Master for Avoiding Dangerous Situations in Following and Quartering Seas" to account for head-sea parametric rolling. As motions and resulting accelerations caused by head-sea parametric rolling are extreme, current classification society and international criteria for predicting motions and accelerations will be evaluated for their consistency and accuracy in predicting design criteria for new-buildings

Previous ad hoc panels have used the world wide web to provide accurate and timely technical assessments of critical issues. For this reason, we will use the web to disseminate and house information regarding Ad Hoc Panel #13. For more information, we invite you to follow the appropriate links provided. Any comments relevant to the Panel's activities are welcomed.

The Panel tentatively plans to use working groups to focus on specialized problems of interest. The plan and current status of the panel's work will be reported via the Internet. For more information on the Working Groups, please examine the draft charter (link below).

If you are interested in participating, please contact Mr. Bill France.

Activities

December 2004

ABS Guide for the Assessment of Parametric Roll Resonance in the Design of Container Carriers

September 2004

ABS Press Release: Phenomenon Affects Containerships Parametric Roll Research by ABS Provides Guidance for Containership Operators

Fall 2004

ABS Surveyor Magazine Article: Demystifying Parametric Roll (refer to pages 28-33)

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