Statistical Analysis of Wedge Effect on the Seakeeping of a Planing Hull in Irregular Waves at the Onset of the Planing Region

Abstract

In the current paper, different experiments are conducted on a high speed planing craft in irregular waves, with and without a wedge. Performance and seakeeping aspects of these planing hulls in the form of trim, rise-up, and resistance in regular waves and heave, pitch, bow, and center of gravity (CG) acceleration in irregular waves are extracted in time series. Irregular waves represent sea state 3 with 12cm height and peak period of 1.66. A model length of 2.63m and 1:5 scale is considered and all data for irregular waves are scaled, as well. The deadrise angle is constant and is taken to be 24 degrees. The targeted experimental tests are conducted for four longitudinal Froude numbers of 1.0, 1.18, 1.37, and 1.57, which are all in the planing regime. The results are analyzed for the mean height of wave, significant wave height, RMS, and spectrum. The comprehensive study of wedges' effects is also presented which indicates that a wedge can decrease the motions and accelerations, exceedingly. Ultimately, the obtained results are compared against those by Fridsma (1971) and Soletic (2010) and it is demonstrated that motions and accelerations are indeed reduced.

Experimental and Numerical Investigation of Stepped Planing Hulls in Finding an Optimized Step Location and Analysis of Its Porpoising Phenomenon

“…Results of the nonstep model, which are extracted by Ghadimi et al [42], along with experimental measurements obtained in the present study are presented in Tables 5 and 6 at 1 to 8 m/s speeds. e diagrams of resistance, trim, and rise-up are also given versus Froude number in Figure 4 for better comparison.…”

“…Experiments are conducted on a nonstep and a single-step model with the same shape in the National Persian Gulf Towing Tank, and results are used to validate the numerical results. e nonstep model is previously tested by Ghadimi et al [42], while the single-step model is examined in the present study. e length and beam of the model are 2.64 m and 0.551 m, respectively, and the model has a constant deadrise angle of 24°.…”

Numerical Study of the Effect of Angle and Location of the First and Second Steps on the Performance of Planing Hull and Their Optimization Using the Taguchi Statistical Method

“…After that, the rooster tail of wedgemounted hulls was analyzed in a more comprehensive study via both experimental and numerical methods by Mahdi Sajedi et al [31]. Te seakeeping of wedgemounted hulls in irregular waves was also studied experimentally by Ghadimi et al [32]. In the case of stepped hulls, Sajedi et al [29] probed how a single-stepped hull with a step at 30% of vessel length to its stern performs in calm water and Froude numbers from 0.43 to 3.87.…”

“…Tey found that the simultaneous use of stern wedges and transverse steps could improve the vessel's undesirable performance prior to planing regime, which is one of the challenges in planing hull design. Tese extensive data [9,28,29,[31][32][33][34][35][36][37] for diferent confgurations of a single parent model present a unique opportunity to realize how diferent confgurations of step and wedge could afect a planing hull's performance.…”

Experimental appraisal of hydrodynamic performance and motion of a single-stepped high-speed vessel in calm water and regular waves

“…Other conducted research on the planing vessels is related to the performance of the vessel in calm water, experimentally, and numerically. 35–43 Pennino et al. 44 investigated the dynamic trim and resistance of a warped model in calm water using experimental and numerical methods.…”