Active vibration control of a flexible rod moving in water: Application to nuclear refueling machines

Shah, Umer Hameed; Hong, Keum‐Shik

doi:10.1016/j.automatica.2018.03.048

Cited by 63 publications

(37 citation statements)

References 51 publications

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“…It can be seen from the velocity vectors that resin flows from the two ends of the imprint roller. The vortices [22,23] show that resin slows down for some time and waits for the air to escape into the microcavities and, after escaping, the resin fills the microcavities. Figure 8 shows the incomplete filling at the rotating mold's high speed.…”

Section: Resultsmentioning

confidence: 99%

Numerical Study on the Optimization of Roll-to-Roll Ultraviolet Imprint Lithography

2019

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Roll-to-roll ultraviolet (R2R-UV) imprinting is a low-cost and high-throughput method that includes the manufacturing of large-area functional films. However, the quality of the final product is obstructed by the bubble entrapment during the imprinting process. In this study, a multi-phase volume of fluid (VOF) numerical model was used to remove bubble entrapment during the R2R imprinting process, which covered all parameters. This new modified numerical model with open-channel boundary conditions was based on the single zone that contains the direct contact of UV resin with the imprinting mold during the filling process. In addition, this model simulated the UV resin filling into microcavities at the preceding and succeeding ends of the imprinting mold. Different patterns of imprinting mold were considered to enhance the fidelity of R2R-UV imprinting for the comprehensive analysis. The experimental results validated through numerical simulations revealed that the bubble entrapment can be controlled by varying various parameters such as speed of the imprinting system, viscosity, contact angles, and pattern shape. The proposed model may be useful for a continuous bubble-free R2R imprinting process in industrial applications that includes flexible displays and micro/nano-optics.

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Section: Resultsmentioning

confidence: 99%

Numerical Study on the Optimization of Roll-to-Roll Ultraviolet Imprint Lithography

2019

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“…where c j,i , i = 1, 2, j = 1, 2, 3 are constants, determined by the boundary conditions, and we used u i (0) = 0. Here, multiplying both sides of (19)…”

Section: Lemmamentioning

confidence: 99%

“…There are many studies about the control of the flexible structures based on the hybrid PDE-ODE model [9][10][11][12][13][14][15][16][17][18][19]. However, these studies have been treated only the vibration suppression problem.…”

Section: Introductionmentioning

confidence: 99%

Exponential stability of dual flexible arms for grasping and orientation control

Endo

Umemoto

Matsuno

2019

IET Control Theory & Applications

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This paper studies the stability of two one-link flexible arms for grasping and orientation control of an object. Flexible arms are modeled by Euler-Bernoulli beam model, and the overall system is represented by a hybrid PDE-ODE model. Our primary concern is the stability analysis of this hybrid PDE-ODE model. In particular, we use the frequency domain method and prove the exponential stability of this system under our previously proposed boundary controller. In addition, we discuss the robustness of the closed-loop system with respect to the several disturbances including disturbances distributed over the arms and disturbances acting at boundaries. Finally, simulation results are presented to investigate the theoretical results.

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“…In [22], the authors studied the vibration problem and the stochastic disturbances for a flexible marine riser system. In [23], a flexible moving rod was investigated in twodimensional space and vibration control was designed to track the target positions rejection. Up to now, little attention has been paid to suppress the vibration of the long pipe which links the ballast and the platform on the ocean surface.…”

Section: Introductionmentioning

confidence: 99%

Robust Adaptive Control of an Offshore Ocean Thermal Energy Conversion System

Liu

et al. 2020

IEEE Trans. Syst. Man Cybern, Syst.

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Boundary control strategy is developed to analyze the vibration problem of the offshore ocean thermal energy conversion (OTEC) system as well as to constrain the bottom tension and top motion. To provide an accurate dynamic behavior for the OTEC system, this distributed parameter system is modeled and formulated with a governing equation and boundary conditions (PDE-ODEs model). Two robust adaptive boundary controllers are designed and disposed at the endpoints of the system, and the stability of the controlled system under unknown disturbances is achieved. After selecting the relevant parameters appropriately, the offset of the offshore OTEC system can be suppressed to equilibrium position. Finally, the effectiveness of the proposed control is illustrated by simulation.

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Active vibration control of a flexible rod moving in water: Application to nuclear refueling machines

Cited by 63 publications

References 51 publications

Numerical Study on the Optimization of Roll-to-Roll Ultraviolet Imprint Lithography

Numerical Study on the Optimization of Roll-to-Roll Ultraviolet Imprint Lithography

Exponential stability of dual flexible arms for grasping and orientation control

Robust Adaptive Control of an Offshore Ocean Thermal Energy Conversion System

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