Actuator grouping optimization on flexible space reflectors

Hill, John; Wang, K. W.; Fang, Houfei; Quijano, Ubaldo

doi:10.1117/12.880086

Cited by 17 publications

(5 citation statements)

References 15 publications

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“…Sheng and Kapania [26] used the GA to optimize the locations of the actuators for a primary mirror to achieve the minimum surface error caused by thermal distortion. Hill et al [27] used the elimination method to determine the optimal grouping of the PVDF actuators for a membrane reflector. Wang et al [28] studied the optimal design of actuator locations in a honeycomb mirror by using the Simulated Annealing Algorithm.…”

Section: Introductionmentioning

confidence: 99%

Shape Control of a Carbon Fiber-Reinforced Polymer Reflector and Placement Optimization of the Actuators

Wu,

Yang,

Liu

2024

Applied Sciences

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In this study, a method for the active shape control for carbon fiber-reinforced polymer (CFRC) reflectors using piezoelectric lead zirconate titanate (PZT) actuators is proposed. According to this method, a finite element model considering higher transverse shear deformation with independent voltage degrees of freedom is formulated by the Hamilton principle. An optimal shape controller that minimizes the discrete root mean square (RMS) error of a reflecting surface is applied. Then, the optimal arrangements of the PZT actuators are determined by numerical optimization methods, which are developed by modifying the classical Genetic Algorithm, with both single and multi-objective optimizations being studied. In the single optimization formulation, the number of actuators is considered as a constraint, and the RMS error of the reflector is regarded as the optimizing target. A hybrid method that combines the gradient projection method with an adaptive Genetic Algorithm is proposed to solve this problem. In the multi-objective optimization, the residual RMS errors and power consumption of the actuators are considered as the optimization targets. Pareto optimal solutions are obtained by an improved multi-objective Genetic Algorithm. Numerical examples are provided to show the effectiveness of the proposed methods.

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Section: Introductionmentioning

confidence: 99%

Shape Control of a Carbon Fiber-Reinforced Polymer Reflector and Placement Optimization of the Actuators

Wu,

Yang,

Liu

2024

Applied Sciences

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“…7) Hill et al investigated optimal location of piezo-electric actuators which suppress thermal deformation of an inflatable polyimide-based reflector. 8) In these studies, plate-shape actuators were attached on the surface of the reflectors so that they apply in-plane force. Datashvili et al investigated controlling surface shape of a reflector composed of carbon fiber reinforced silicone to change its shape by applying out-of-plane forces by linear actuators.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Out-of-Plane Thermal Deformation of CFRP Reflectors by Linear Actuators

Tanaka

Ikeda

Goto

et al. 2018

AEROSPACE TECHNOLOGY JAPAN

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Carbon fiber reinforced plastic (CFRP) is considered to be one of the possible materials for reflectors of space-based astronomical observation systems because of its high specific elasticity and low coefficient of thermal expansion. However, it was demonstrated that non-negligible out-of-plane thermal deformation would be generated on CFRP reflectors. In this study, capability of a method of suppressing the out-of-plane thermal deformation was examined. In the proposed method, surface shape of the reflectors was controlled by applying external forces with linear actuators so that RMS error due to the thermal deformation was minimized. As a result, it was shown that the out-of-plane thermal deformation caused by fiber orientation error in manufacturing process could be suppressed significantly by the proposed simple method. Sensitivity analysis on location of actuators and input forces was also performed and it was seen that the location of actuators and the input forces need to be controlled strictly to realize high precision surface shape control of CFRP reflectors.

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“…To suppress the thermal deformation, the structural elements are often made of carbon fiber reinforced plastics (CFRPs) [1][2][3][4][5] , because some kinds of CFRPs have a negative linear expansion coefficient in the fiber direction and the thermal deformation can be canceled by arranging the CFRP orientations or combining them with metals adequately. Moreover, active shape control by using piezoelectric actuators on orbit has been also studied [6][7][8][9][10] . However, even though the structural elements are made of CFRPs, piezoelectric actuators still possibly deform thermally.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermal Strain Suppression Design of Piezoelectric Ceramic Actuators

Uchida

Ikeda

Senba

et al. 2016

AEROSPACE TECHNOLOGY JAPAN

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Piezoelectric ceramic actuators with less thermal strain were designed by symmetrically stacking two kinds of piezoelectric ceramics plates whose linear expansion coefficients were positive and negative, and their performance was evaluated. Three types of actuators were examined, which have a different stacking direction. The electromechanical material constants were evaluated by a one-dimensional model and the results were compared with a three-dimensional finite element analysis. The result showed that the piezoelectric constant of an actuator stacked in the perpendicular direction to the electric field was about three times larger than that of an actuator stacked in the parallel direction, even though the volume ratio between the two kinds of plates was almost the same between the stacking types. This is because most of the voltage in the latter type was distributed to the piezoelectric plate with low permittivity and low piezoelectric constant. Therefore, it is important to consider the stacking direction and the permittivity in the design of the actuators. The three-dimensional finite element analysis showed the linear expansion coefficient was not zero even though it was zero in the one-dimensional model. Therefore, three-dimensional analysis is necessary for precise design, although the one-dimensional model provides good estimation of the electromechanical property.

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Actuator grouping optimization on flexible space reflectors

Cited by 17 publications

References 15 publications

Shape Control of a Carbon Fiber-Reinforced Polymer Reflector and Placement Optimization of the Actuators

Shape Control of a Carbon Fiber-Reinforced Polymer Reflector and Placement Optimization of the Actuators

Suppression of Out-of-Plane Thermal Deformation of CFRP Reflectors by Linear Actuators

Evaluation of Thermal Strain Suppression Design of Piezoelectric Ceramic Actuators

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