Semiactive Isolator With Liquid-Crystal Type ER Fluid for Momentum-Wheel Vibration Isolation

Oh, Hyun-Ung; Onoda, Junjiro; Minesugi, Kenji

doi:10.1115/1.1646418

Cited by 23 publications

(10 citation statements)

References 17 publications

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“…Electro/magneto-rheological (ER/MR) dampers, for example, are semi-active elements in which the damping is controlled by electric/magnetic eld. Many researchers have studied the performance of various control methods using ER/MR uid [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Switched Stiffness Vibration Controllers for Fluidic Flexible Matrix Composites

Lotfi-Gaskarimahalle

Rahn

2009

Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts a and B

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This paper investigates semi-active vibration control using Fluidic Flexible Matrix Composites (F 2 MC) as variable stiffness components of exible structures. The stiffness of F 2 MC tubes can be dynamically switched from soft to stiff by opening and closing an on/off valve. Fiber reinforcement of the F 2 MC tube changes the internal volume when externally loaded. With an open valve, the uid in the tube is free to move in or out of the tube, so the stiffness is low. When the valve is closed, the high bulk modulus uid resists volume change and produces high stiffness. The equations of motion of an F 2 MC-mass system is derived using a 3D elasticity model and the energy method. The stability of the unforced dynamic system is proven using a Lyapunov approach. To capture the important system parameters, nondimensional full order and reduced order models are developed. A Zero Vibration (ZV) state switch technique is introduced that suppresses vibration in nite time, and is compared to conventional Skyhook semiactive control. The ITAE performance of the controllers is optimized by adjusting the open valve ow coef cient. Simulation results show that the optimal ZV controller outperforms the optimal Skyhook controller by 13% and 60% for impulse and step response, respectively. IntroductionVibration degrades the performance of many mechanical systems. The accuracy of trajectory tracking and set-point regulation is often limited by structural vibration. Vibration control is categorized as: active [1], passive [2], semi-active [3,4] or hybrid [5], based on the power consumption of the control system.Active vibration control systems normally can achieve

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Section: Introductionmentioning

confidence: 99%

Switched Stiffness Vibration Controllers for Fluidic Flexible Matrix Composites

Lotfi-Gaskarimahalle

Rahn

2009

Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts a and B

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“…Makihara et al studied the techniques for isolating observation devices from disturbances of the momentum wheel using piezoelectric ceramics [12]. Oh et al investigated the characteristics of two types of isolators for flywheel vibrations [13,14]. The first type used electrorheological fluid to act as agent of semi-active isolation.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Flywheel Microvibration Isolation Platform for Spacecraft

Wei

Luo

et al. 2015

Journal of Spacecraft and Rockets

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“…However, it also produces undesirable force and torque because of wheel-imbalance and the imperfection of the ballbearings. Since these disturbances may seriously damage observation activities, the use of vibration isolation systems for space applications has become standard practice [1][2][3][4][5][6][7][8][9]. For better observation activities, the isolator that is placed between a momentum-wheel and an observation device needs to meet two requirements: it must (1) isolate the observation device from momentum-wheel disturbance and (2) not affect the attitude-control operation of the momentum-wheel.…”

Section: Introductionmentioning

confidence: 99%

New approach to semi-active vibration isolation to improve the pointing performance of observation satellites

Makihara

Onoda

Minesugi

2006

Smart Mater. Struct.

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A momentum-wheel installed to provide attitude-control torque actually produces undesirable force or torque disturbances owing to wheel imbalance and imperfection of the ball-bearings. To improve the pointing performance of observation satellites, a vibration isolator is used to isolate observation devices from these disturbances. This paper compares three types of semi-active isolators that consist of a piezoelectric material and a switch-controlled passive circuit. Since this isolation is implemented by controlling a circuit switch no external energy is supplied to the system, and so the system is stable even when a malfunction occurs in control. We propose a simple but effective isolation method that needs to know only one velocity value instead of the full state of the system. Numerical simulations with a simple model of an observation satellite demonstrated that the proposed isolator works well to isolate an observation device from disturbances caused by the momentum-wheel, without causing any degradation in the attitude control of satellites.

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Semiactive Isolator With Liquid-Crystal Type ER Fluid for Momentum-Wheel Vibration Isolation

Cited by 23 publications

References 17 publications

Switched Stiffness Vibration Controllers for Fluidic Flexible Matrix Composites

Switched Stiffness Vibration Controllers for Fluidic Flexible Matrix Composites

Performance Analysis of a Flywheel Microvibration Isolation Platform for Spacecraft

New approach to semi-active vibration isolation to improve the pointing performance of observation satellites

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