Open-Loop Vibration Control of an Underwater System: Application to Refueling Machine

Shah, Umer Hameed; Hong, Keum–Shik; Choi, Sang-Hei

doi:10.1109/tmech.2017.2706304

Cited by 57 publications

(33 citation statements)

References 54 publications

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“…Let f w ( r , t ) represent the hydrodynamic force acting on the payload moving in the water. Then, according to Shah et al, 50 the expression of f w ( r , t ) can be given as follows…”

Section: Problem Statementmentioning

confidence: 99%

“…To reduce the vibrations in both two directions of the fuel rod, a relatively indirect but comprehensive control law is developed in Shah and Hong 49 to regulate the movement of the trolley and the bridge. In Shah et al, 50 considering the constraint of the rod’s deflection range and a similitude law, a modified input shaping method is developed to limit the flexible rod’s residual vibrations.…”

Section: Introductionmentioning

confidence: 99%

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Point-to-point motion control for flexible crane systems working in the deep sea

Wang

Sun

et al. 2020

Measurement and Control

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At present, marine resources, especially the deep-sea resources, are becoming more and more important in resource exploitation globally, and hence, widely used deep-sea cranes are playing essential roles. For such systems, the bridge frames and trolleys are set up above the water, while payloads are transported under the water. In this underwater situation, there exist hydrodynamic forces such as complicated disturbances to the crane systems, making the payload vibration and rope flexibility more obvious. For the sake of improving working efficiency, considering the constraints of all the state variables, an anti-vibration trajectory is designed for the trolley motion, which can not only ensure trolley positioning but also suppress the flexible payload’s vibrations. Then, the state variables are constrained within preset safety ranges. Finally, numerical simulation results prove the satisfactory performance of the designed method.

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“…Let f w ( r , t ) represent the hydrodynamic force acting on the payload moving in the water. Then, according to Shah et al, 50 the expression of f w ( r , t ) can be given as follows…”

Section: Problem Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Point-to-point motion control for flexible crane systems working in the deep sea

Wang

Sun

et al. 2020

Measurement and Control

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“…The replacement system of the nuclear reactor is denoted as Fuel Handling(F/H) (Katoh et al, 2010;Zeng et al, 2018), which is the control system of the nuclear replacement robot used to supply pressure, and the nuclear replacement robot is the fuelling machine (F/M) (Shah, Hong & Choi, 2017;Banerjee & Gupta, 2017). The F/H system is located in front of the F/M, and controls the supply pressure of the heavy water required to exchange nuclear fuel.…”

Section: Introductionmentioning

confidence: 99%

Development of PINN Controller for Fuel Handling System of Pressurized Heavy Water Reactors

Lim¹,

Park²,

Chong³

2020

STUD INFORM CONTROL

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The required operating pressure of the Wolsong nuclear power plant is currently controlled by a proportional integral (PI) controller. The PI controller has a simple structure and was designed to meet requirements through gain setting. However, these control requirements can be difficult to meet without properly adjusting the gain when certain parameters change, such as the wear and tear in the valves or pipes. To solve these problems, it is important to dynamically change the PI controller gain or compensate for the PI controller output. The purpose of this study is to help design a controller that is capable of providing stable control in order to reduce errors regardless of parameter changes. The proposed PI neural network (PINN) control technique involves a PI controller and a neural network controller combined in parallel. The neural network component which is designed to be robust compensates the output of the controller for changes in the above-mentioned parameters. Because assessing the controller performance straightforwardly in real-time processes can be difficult, a simulator model was developed based on real-time processes, and it showed changes in the parameters involved. The results confirmed that the proposed PINN controller reduced the instability of the fuel supply machine and, hence the aforementioned problem could be properly controlled.

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“…A number of studies used isolators or dampers to reduce vibration for high-tech buildings. [16][17][18][19][20][21][22][23] Hwang et al 16 studied the seismic protective systems for high-tech structures, and found that the incorporation of viscous dampers not only enhance the seismic safety but also minimize the micro-vibration of the structure. Lin et al 17 proposed a micro vibration mitigation system using viscous dampers for high-tech buildings, and results presented that the vibration can be effectively captured by the viscous damper and converted to lower frequencycontent tremors.…”

Section: Introductionmentioning

confidence: 99%

“…Alqado et al 20 presented an approach on the control of structures with magnetorheological dampers, and the effectiveness of the proposed scheme was compared with those achieved by classical and well-established alternative control schemes. Shah et al 21 studied a residual vibration control problem of the refueling machine that transports fuel rods in water of the nuclear reactor. The simulation and experimental results showed that the proposed method can effectively suppress the vibrations of the flexible rod operating in water.…”

Section: Introductionmentioning

confidence: 99%

Investigation of vibration induced by moving cranes in high-tech factories

Kuo

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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A finite element model was developed to simulate the crane induced vibration on the floor of high-tech factories, in which the mesh include beam, plate, spring-damper, and moving wheel elements. The finite element results were first compared with the experimental measurements in good agreement. The parametric studies were then performed to study the vibration behavior of high-tech factories due to the effects of rail irregularities, slab depth, and crane speed. The rail irregularities induce the vibration of the crane and slab at their natural frequencies, and both rail irregularities and the crane acceleration induce the crane rotation in its natural frequency, so that smoothing the wheel and rail should be the first priority to decrease slab vibration. The crane speed is another important issue to influence slab vibration, which decreases with the reduction of the crane speed clearly from the parametric study. Thus, decreasing the crane speed to reduce slab vibration is an alternative, and experiments are caused to find the optimal crane speed and acceleration. The crane induced vibration is the relatively largest and smallest at the column location and beam center, respectively. Therefore, increasing the slab and beam depth to decrease the slab vibration induced by the moving crane is an additional option.

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Open-Loop Vibration Control of an Underwater System: Application to Refueling Machine

Cited by 57 publications

References 54 publications

Point-to-point motion control for flexible crane systems working in the deep sea

Point-to-point motion control for flexible crane systems working in the deep sea

Development of PINN Controller for Fuel Handling System of Pressurized Heavy Water Reactors

Investigation of vibration induced by moving cranes in high-tech factories

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