Series preface

Bhattacharyya, Rameswar; McCormick, Michael E.

doi:10.1016/s1571-9952(03)80001-6

Cited by 2 publications

(3 citation statements)

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“…The relationship between the variance, total energy (E), the area under the 𝑆(𝜔) − 𝜔 curve (𝑚 0 ), and the energy density of regular waves at different frequencies (𝑆(𝜔)) can be stated in Eq. ( 2) (Bhattacharyya, 1978).…”

Section: Statistical Analysis Of the Wave Generated In The Towing Tankmentioning

confidence: 99%

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Singular and Simultaneous Effects of Step and Stern Wedge on High-speed Craft Behavior in Irregular Waves: Experimental and Statistical Assessment

Ghadimi,

Sajedi,

Ghadimi

2024

Preprint

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In the design process of high-speed craft, the motions and exerting acceleration on the craft in waves are of great importance. Due to the relatively small size of this type of vessel, they incur more intensive motions and higher accelerations in the presence of waves. In the current study, the behavior of five configurations of baseline, wedge-mounted, single-stepped, wedge-mounted single-stepped and double-stepped planing hulls in irregular waves were experimentally studied. All models have a length of 2.6 m, a beam of 55 cm, and weigh 86 kg. The considered irregular wave was generated using the JONSWAP spectrum and had a characteristic height of 12 cm and a peak period of 1.6 s. These models were towed at Froude numbers ranging from 2.15 to 3.44. The analysis of heave and pitch motions of these models demonstrated that simultaneous use of a single-step and a stern wedge can reduce the heave and pitch double-amplitudes of the planing hull up to 33% and 60%, respectively. That’s while, the double-stepped model was the least successful model in heave and pitch motions reduction, by a maximum of 27% and 18% reduction for heave and pitch motions, respectively. Regarding the acceleration of these vessels, the wedge-mounted single-stepped hull experienced 34% and 16% lower accelerations in its center of gravity and bow than what the baseline model experienced. However, using two steps could only reduce these two types of acceleration by 10% and 4%, respectively.

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Section: Statistical Analysis Of the Wave Generated In The Towing Tankmentioning

confidence: 99%

“…where the function of 𝑓(𝐻 𝑖 ) gives the number of occurrences of 𝐻 𝑖 (Bhattacharyya, 1978). To calculate the probability density function, 998 amplitudes corresponding to 30 periods in 50 seconds were utilized in the analysis of the results.…”

Section: Statistical Analysis Of the Wave Generated In The Towing Tankmentioning

confidence: 99%

Singular and Simultaneous Effects of Step and Stern Wedge on High-speed Craft Behavior in Irregular Waves: Experimental and Statistical Assessment

Ghadimi,

Sajedi,

Ghadimi

2024

Preprint

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“…The roll motion has been given a lot of consideration through the years since it was the most important motion that might activate overturns. It appeared that it would continue to be popular for many years to come because so many casualties have been documented as a result of severe rolling 10 . The nonlinear characteristics of damping and restoring frequently break the motion's linearity.…”

Section: Introductionmentioning

confidence: 99%

Different controllers for suppressing oscillations of a hybrid oscillator via non-perturbative analysis

Moatimid,

El-Sayed,

Salman

2024

Sci Rep

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To arrive at an equivalent linear differential equation, the non-perturbative approach (NPA) is established. The corresponding linear equation is employed for performing the structural analysis. A numerical computation demonstrates a high consistency with the precise frequency. The correlation with the numerical solution explains the reasonableness of the obtained solutions. For additional nonlinear kinds of oscillation, the methodology gives an exact simulation. The stable construction of the prototype is shown in a series of diagrams. Positive position feedback (PPF), integral resonant control (IRC), nonlinear integral positive position feedback (NIPPF), and negative derivative feedback (NDF) are proposed to get rid of the damaging vibration in the system. It is found that the NDF control is more efficient than other controllers for vibration suppression. The theoretical methodology is applied by using the averaging method for getting a perturbed solution. The stability and influence of various parameters of the structure are established at main and 1:1 internal resonance, which is presented as one of the worst resonance cases. Association concerning mathematical solution and computational simulation is achieved.

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Series preface

Cited by 2 publications

References 0 publications

Singular and Simultaneous Effects of Step and Stern Wedge on High-speed Craft Behavior in Irregular Waves: Experimental and Statistical Assessment

Singular and Simultaneous Effects of Step and Stern Wedge on High-speed Craft Behavior in Irregular Waves: Experimental and Statistical Assessment

Different controllers for suppressing oscillations of a hybrid oscillator via non-perturbative analysis

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