BModes units

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Josean.Galvan
Posts: 15
Joined: Fri Aug 30, 2013 3:16 am
Organization: Tecnalia R&I
Location: Spain
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BModes units

Postby Josean.Galvan » Thu Jul 23, 2015 4:38 am

Hi all,

I have a short question regarding "hydrodynamic" stiffness and added mass matrices used by BModes when is supported by a floating structure. Angle related stiffness/added mass must be expressed in degrees or radians?

Thank you.
Josean Galván

Marine Energy Area
Tecnalia R&I - Energy and Environment Division

Jason.Jonkman
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Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
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Re: BModes units

Postby Jason.Jonkman » Thu Jul 23, 2015 7:12 am

Dear Josean,

The units for the hydrodynamic stiffness in BModes are [N/m, N/rad, N-m/m, N-m/rad] for the upper-left, upper-right, lower-left, and lower-right quadrants of the matrix, respectively (radians are used in place of degrees). Likewise, the units for the hydrodynamic added mass in BModes are [N/(m/s^2), N/(rad/s^2), N-m/(m/s^2), N-m/(rad/s^2)], or equivalently, [kg, kg-m, kg-m, kg-m^2].

I hope that helps.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Josean.Galvan
Posts: 15
Joined: Fri Aug 30, 2013 3:16 am
Organization: Tecnalia R&I
Location: Spain
Location: Parque Tecnológico de Bizkaia, C/ Geldo edif. 700, 48160 Derio (Spain)
Contact:

Re: BModes units

Postby Josean.Galvan » Mon Aug 03, 2015 8:14 am

Hi Jason,

thanks it helps!, I wanted to be sure to avoid mistakes.

Thank you for your support!
Kind regards,
Josean Galván

Marine Energy Area
Tecnalia R&I - Energy and Environment Division


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