Publications

Vasquez, G.A., Fonseca, N. and Guedes Soares, C. (2011), “Analysis of vertical motions and bending moments on a Bulk Carrier by model tests and numerical predictions”, XXI Congresso Panamericano de Ingenieria Naval (COPINAVAL), 27th-30th, September, Buenos Aires, Argentina

The paper presents an analysis and comparison between experimental data and numerical predictions of the heave motion, pitch motion and vertical bending moment at midship induced by irregular waves on a Bulk Carrier. The experimental data was obtained with a scaled model on a seakeeping tank. Head and following waves are analyzed together with different Froude numbers. The wave conditions include moderate to severe irregular waves, as well as short duration wave records with very large amplitude single waves inserted (abnormal waves). The predictions are carried out with a linear seakeeping code which has the option to calculate the ship responses in the frequency domain or in the time domain. The second option is useful for direct analysis of the responses in the time domain. The time domain version of the code calculates the hydrodynamic forces using convolution integrals of memory functions, infinite frequency added masses and radiation restoring coefficients. The experimental data and numerical results are compared in terms of transfer functions of the motions and vertical bending moments at midship. Direct comparisons of experimental time records and time domain simulations are also carried out. Finally the importance of the nonlinear effects on the vertical motions and loads is assessed and discussed.

You can download this paper from: http://www.ipen.org.br/downloads/XXII/trabajos/194%20-%20Guedes%20Soares%20y%20otros%20Vertical%20motions%20%20COMPLETO%20%28Portugal%29.pdf

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