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5512 Pitch and Heave

Experiment

Pitch and heave experiment setup.

Pitch and heave experiment setup.

Towing-tank experiments of coupled pitch and heave motions are presented for a surface combatant advancing in regular headwaves.  The data includes ballasting parameters, encounter frequency, time histories, Fourier series amplitudes, and pitch and heave transfer functions and phase. The geometry of interest is DTMB model 5512, a 1:46.6 scale, 3.048 m long, fiber reinforced Plexiglas hull. Model 5512 is a geosim of DTMB model 5415, a 1:24.8 scale 5.72 m model. The model is unappended, i.e., not equipped with bilge keels, shafts, struts, propellers, or rudders.  The experiments are performed in a 3 x 3 x 100 m towing tank equipped with a plunger-type wavemaker.  The test program is undertaken to create a validation dataset for unsteady Reynolds-averaged Navier Stokes simulations including rigorous and comprehensive uncertainty assessment of the experimental results following standard procedures.  Results indicate that the regular headwaves are in the linear regime except for a few high-steepness cases.  Pitch and heave responses are mostly independent of wave steepness, however, some nonlinear responses are identified mainly for high-speed, short-wavelength test cases.

Data, Equipment, and Conditions

Data, equipment, and conditions

Data Equipment Fr Ak
Ship motions Krypton motion tracker 0, 0.19, 0.28, 0.34, 0.41 0.025, 0.05, 0.075

Sample Image

DCF 1.0

Overhead view of model 5512, Krypton target, and pitch and heave mount.

Download 5415 Geometry

Click on the image below to download an .igs file of the appended model 5415 (all dimensions are given in inches).

Model_5512_rendering_perspective

Sample Data

Pitch (top) and heave (bottom) transfer functions and phase and uncertainty error bars for Fr = 0.28 and a range of encounter frequencies and wave steepnesses.

Pitch_Fr28_SampleHeave_Fr28_Sample

Get Data: 5512 Pitch and Heave Data

Note: If you download and use our data, please also use the following citations:

References

Irvine, M., Longo, J. and Stern, F., “Pitch and Heave Tests and Uncertainty Assessment for a Surface Combatant in Regular Head Waves,” Journal Ship Research, Vol. 52, No. 2, June 2008, pp. 146-163. (pdf)

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Last modified on August 3rd, 2015
Posted on September 10th, 2013