Statistical analysis of planing hull motions and accelerations in irregular head sea

Begović, Ermina; Bertorello, Carlo; Pennino, Silvia; Piscopo, V.; Scamardella, A.

doi:10.1016/j.oceaneng.2015.12.012

Cited by 33 publications

(13 citation statements)

References 8 publications

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“…Upon increasing / from 0.25 to 1.75, the results were considered to have sufficient effect, where the magnitude of the heave motion increased by 158% (Table 5); however, the pitch motion of the rounded hull catamaran subsequently increased up to 73.3% as / increased from 0.25 to 1.5. This possibly occurred due to the vertical motion at the bow region of the catamaran which became relatively more stiff in motions [38]. Similar to what was conducted by [4], it was generally concluded that the rounded hull catamaran was liable to have vigorous vertical motion responses; both of the heave and pitch motions within the range of 1.5≤ / ≤1.75.…”

Section: Effect Of Various Ratios Of Wavelengths ( / )supporting

confidence: 68%

Seakeeping performance of a rounded hull catamaran in waves using CFD approach

Fitriadhy¹,

Razali²,

AqilahMansor³

2017

J. MECH. ENG. SCI.

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Prediction of the seakeeping performance of a ship in the earlier ship's design step is necessary to ensure the safety of navigation during sailing. To accommodate such a demand, this research proposes to analyse the seakeeping performance of a rounded hull catamaran. The vertical motion of the catamaran including the heave and pitch motions were quantified by her Response of Amplitude Operator (RAO). The Computational Fluid Dynamic software was used to develop the model, where several effects of various Froude numbers, hull lateral separation ratios and wavelengths on the heave, and pitch motions of the rounded hull catamaran have been taken into account. The results revealed that the higher Froude number associated with less hull lateral separation ratio was proportional to the subsequent increase of her heave and pitch motions. In the case of / ≤1.0, the seakeeping quality of the rounded hull catamaran has been improved and presented in the form of a sufficient reduction of the heave and pitch motions. It is shown that the estimated seakeeping performance of the rounded hull catamaran greatly depends on the Froude numbers and magnitude of wavelength.

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Section: Effect Of Various Ratios Of Wavelengths ( / )supporting

confidence: 68%

Seakeeping performance of a rounded hull catamaran in waves using CFD approach

Fitriadhy¹,

Razali²,

AqilahMansor³

2017

J. MECH. ENG. SCI.

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“…According to Camilleri et al, (2018) [26], after compared the signals at several cut-off frequencies, the 10 Hz cut-off frequency recommended by Riley et al, (2014a) [13] is too low hence does not signify the peak acceleration rise accurately. In the most recent study conducted by Begovic et al, (2020) [23] and Begovic et al, (2016) [24] for model experiments conducted at UNINA, the cut-off frequency of 30 Hz also was chosen after observing extensive measured and simulated vertical accelerations results and found to be appropriate for removing vibration content without significantly affecting the rigid body dynamics. The effects of low pass filtering at frequencies 25 Hz, 33 Hz, and 58 Hz shown in Figure 11.…”

Section: Slamming Impactmentioning

confidence: 99%

Slamming Impact Accelerations Analysis on Small High Speed Passenger Crafts

Samad

Yusop

Shaharuddin

et al. 2021

brod

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Small high speed passenger crafts (HSC) are commonly known for their poor seakeeping qualities. These crafts are frequently exposed to large slamming impacts and these repetitive shocks may pose danger to passengers’ safety and health. In Malaysia, small high speed passenger crafts having lengths between 7 to 9 meters are mainly used to transport tourists between popular island destinations. Evaluation on impact and vibration for this type of craft was conducted by using accelerometers attached to several locations on craft’s deck. The test was conducted at speeds ranged between 20 to 30 knots and the highest peak accelerations were recorded. The highest acceleration record during the sea trial was recorded at 4.22 g and the average acceleration measure is 2.20 g. Apart from this test, evaluation on effectiveness of the current foam seat typically used in this craft were evaluated using Dynamic Response Index (DRI) and results have shown that the seat is less efficient when impact reaches more than 1g at speeds of more than 20 knots. It is concluded that safety measures such as the use of more efficient suspension seat and limiting the operational speed need to be taken into consideration.

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“…In 2003, Azcueta et al [13] conducted an analysis on the speed performance of a power boat, based on the free-surface RANS, and their method is suitable for predicting the severe responses of the vessel in waves, making it possible to predict the nonlinear motion of planing craft in rough sea conditions. In 2014, Begovic et al [14,15] conducted research on the responses of hull forms of a vessel in waves, and the response amplitudes in both regular and irregular waves were obtained and compared with the corresponding test data. The Weibull distribution was adopted to analyze the motion response of the model in irregular waves, especially in relation to the acceleration of the center of gravity (CG).…”

Section: Introductionmentioning

confidence: 99%

Seakeeping Analysis of Planing Craft under Large Wave Height

Zhuang

2020

Water

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The purpose of this paper is to conduct a seakeeping analysis of planing craft under regular wave with large wave height. To obtain a reliable numerical method to simulate the sailing of planing craft in waves, Reynolds-averaged Navier–Stokes (RANS) solver and overset method are adopted. The motion response and resistance of the planing craft USV01 in regular wave were numerical predicted and compared with the corresponding seakeeping experimental tests. The results show that the numerical method has high accuracy. For further study, a new planing craft whose name is improved vessel is selected for simulation, the low steaming of the USV01 and improved vessel in regular wave with large wave height was simulated, and the seakeeping of the two vessels was studied. The analysis about the influence of wave length on the motion response and navigation configurations of the improved vessel under regular wave was carried out. Meanwhile, the influence of speed on different navigation configurations of the improved vessel was also analyzed. The improved vessel can provide better seakeeping, and a reduction in the speed of the vessel will benefit its seakeeping, irrespective of its navigation configuration.

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Statistical analysis of planing hull motions and accelerations in irregular head sea

Cited by 33 publications

References 8 publications

Seakeeping performance of a rounded hull catamaran in waves using CFD approach

Seakeeping performance of a rounded hull catamaran in waves using CFD approach

Slamming Impact Accelerations Analysis on Small High Speed Passenger Crafts

Seakeeping Analysis of Planing Craft under Large Wave Height

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