Design a software real-time operation platform for wave piercing catamarans motion control using linear quadratic regulator based genetic algorithm

Liang, Lihua; Yuan, Jia; Zhang, Songtao; Zhao, Peng

doi:10.1371/journal.pone.0196107

Cited by 13 publications

(15 citation statements)

References 20 publications

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“…Genetic algorithm is a simulated evolutionary algorithm based on the self-adapting global optimization search, which is formed by the operation of the natural selection mechanism [32–34]. Therefore, main processes for applying GA to get the optimal Q and R parameters are as follows [35–37], and the SIMULINK software for simulation of the GA was used and was written using a MATLAB programming language [2].…”

Section: Controller Designmentioning

confidence: 99%

Design ride control system using two stern flaps based 3 DOF motion modeling for wave piercing catamarans with beam seas

et al. 2019

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A ride control system (RCS) based linear quadratic regulator (LQR) and genetic algorithm (GA) design is presented, to reduce the heave, roll and pitch motion (three degrees of freedom motion (3 DOF motion)) of the wave piercing catamarans (WPC) in beam waves. A detailed 3 DOF ride control model which consists of the coupling and decoupling relationships between longitudinal and transverse motion is proposed for the WPC vessel. And the complex hydrodynamic coefficients and disturbances induced by beam waves are analyzed. Moreover, two stern flaps are designed for the system in the way of alternate flapping. In the controller design, the LQR method based on GA method is adopted to reduce the 3 DOF motion of the ship. Depending on the robust search mechanism and global optimum of GA, weighting parameters can be obtained to calculate the desired gain. Finally, the motion reduction and motion sickness incidence (MSI) results demonstrate the feasibility and effectiveness of the proposed controller, and the comfort of passengers and crews can also be improved.

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Section: Controller Designmentioning

confidence: 99%

Design ride control system using two stern flaps based 3 DOF motion modeling for wave piercing catamarans with beam seas

et al. 2019

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“…LQR is an optimal control strategy with the quadratic performance indexes and it is widely applied to the active control of deterministic vibratory systems [37]. This is an automatic means of finding an appropriate state-feedback controller that minimizes the performance index [38]. To achieve the optimal roll reduction effect, the linear quadratic performance index is selected as: Where Q is the semi-positive definite symmetric weight matrix and R is the positive definite symmetric matrix.…”

Section: System Modeling and Controller Designmentioning

confidence: 99%

Simulation and experimental study on control strategy of zero-speed fin stabilizer based on disturbance and compensation

et al. 2018

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Zero-speed fin stabilizer is applied to reduce the roll motion of ships at zero speed. This paper aims to explore the control strategy of zero-speed fin stabilizer through a composite method of theoretical analysis, simulations and tank tests. The hydrodynamic force model is established using analytical approach and a simplified model is obtained by fitting the CFD simulation data. The control strategy of zero-speed fin stabilizer is obtained based on disturbance and compensation by analyzing the phase matching relationship between the wave disturbance, the roll motion of the ship, the movement of the fin and the fin-induced hydrodynamic force. Simulations and water tank tests are performed to verify the effectiveness and feasibility of the obtained control strategies. The results of simulations and tank tests show that the obtained control strategies of zero-speed fin stabilizer based on disturbance and compensation are effective and practical. The proposed method provides theoretical and experimental support for engineering application, and can also be a reference for the controller design of zero-speed fin stabilizers.

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“…Medium speed operation can also increase the transport energy efficiency (Davidson et al, 2011;Haase, 2015;Haase et al, 2016). However, ride control systems (a T-foil and stern flaps) (Liang et al, 2016;Liang et al, 2018) are not effective at low to medium speeds and thus reduction in motions and loads may not be achieved (AlaviMehr et al, 2017a, b). There is therefore a need to investigate other means to minimise loads at medium speed, and in this regard the wet-deck height and centre bow length are key design parameters.…”

Section: Introductionmentioning

confidence: 99%

Centre bow and wet-deck design for motion and load reductions in wave piercing catamarans at medium speed

Shabani

Lavroff

Holloway

et al. 2019

Ships and Offshore Structures

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For wave piercing catamarans (WPCs), the centre bow length and tunnel clearance are important design factors for slamming, passenger comfort and deck diving. An experimental study was performed here to determine the influence of centre bow and wet-deck geometry on WPC motions and loads. The vertical accelerations, magnitudes of slamming loads and vertical bending moments acting on a 112 m WPC vessel were investigated at a reduced speed of 20 knots using five centre bow (CB) and wet-deck configurations: parent CB, high CB, low CB, long CB and short CB. A 2.5 m hydroelastic segmented catamaran model was used and over 200 model tests were conducted in regular head sea waves in wave heights equivalent to 2.7 m, 4.0 m and 5.4 m at full scale. It was found that increasing the wet-deck height resulted in higher vertical accelerations due to global motions but reduced the slamming loads at a speed of 1.53 m/s in model scale (20 knots full scale). The greatest peak vertical loads acting on the centre bow ranged between 18% and 105% of the total hull weight depending on the centre bow configuration and wave height. Correlation coefficients were obtained for regression models describing the relationship between the total vertical loads and the peak vertical bending moments. It was found that a reduction of speed from 38 knots to 20 knots can reduce the maximum slam loads by approximately 30% in regular waves. When considering both low and high speeds, the Short CB was found to be a consistent design for slamming reduction in comparison with the high CB.

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Design a software real-time operation platform for wave piercing catamarans motion control using linear quadratic regulator based genetic algorithm

Cited by 13 publications

References 20 publications

Design ride control system using two stern flaps based 3 DOF motion modeling for wave piercing catamarans with beam seas

Design ride control system using two stern flaps based 3 DOF motion modeling for wave piercing catamarans with beam seas

Simulation and experimental study on control strategy of zero-speed fin stabilizer based on disturbance and compensation

Centre bow and wet-deck design for motion and load reductions in wave piercing catamarans at medium speed

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