A multifunctional high strain composite (HSC) hinge for deployable in-space optomechanics

Echter, Michael A.; Gillmer, Steven R.; Silver, Mark; Reid, Brendan N.; Martinez, Robert

doi:10.1088/1361-665x/abad4d

Cited by 8 publications

(4 citation statements)

References 22 publications

(25 reference statements)

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“…The deployable boom is constructed from six carbon composite shafts and high strain composite hinges in the middle of pairs of shafts that can be folded for stow. The preparation of these particular composite hinges has been described previously along with their positioning performance with integrated actuators [9,23]. It should be noted that the current work can be implemented on many other deployable structures as well as with varying types of hinge mechanisms [24][25][26][27][28].…”

Section: Experiments and Analysismentioning

confidence: 99%

“…The scope of the current work is motivated by this concept and focuses on a particular enabling technology: fiber optic strain sensing. A variety of embedded actuation [3,9] and metrology can be implemented; however, fiber optic strain sensors have the unique advantages of high precision, lowprofile, and simple operation. Despite the advantages they do have shortcomings.…”

Section: Introductionmentioning

confidence: 99%

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A neural network-informed self-aware deployable structure with application to phased array antennas

Gillmer¹,

Silver²,

Jeon³

2022

Smart Mater. Struct.

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State of the art radio frequency (RF) arrays are growing larger in pursuit of increased signal-to-noise ratio. In support of this goal, elaborate forms of metrology are being developed to support the increased footprints. This work provides a unique solution to fulfill the metrology requirements of large-scale deployable RF antennas through the implementation of neural network demodulation of fiber optic strain sensors. The fiber optics are patterned with Fiber Bragg Gratings (FBGs) to encode strain on to back-reflected shifts in the wavelength of incident light. Experiments show the neural network can predict the deformation of a test structure within single millimeters for small amplitude motions. Therefore, the current technique meets the required lambda/20 precision needed for large scale deployable RF arrays operating at S-band or longer wavelengths.

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Section: Experiments and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A neural network-informed self-aware deployable structure with application to phased array antennas

Gillmer¹,

Silver²,

Jeon³

2022

Smart Mater. Struct.

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“…Due to their flexibility and thinness, MFCs are popular actuators for inducing shape change in morphing aircraft structures, [23][24][25] but they are seldom implemented in deployable space structures. To the authors' knowledge, the only notable examples are in the post-deployed shape correction of composite hinges 26 and reflectors, 27 but initiating deployment with piezoelectric actuation has not been explored. Active deployment control with piezocomposite actuators potentially offer large reductions in system mass and mechanical complexity by lessening the need for quasi-static deployers while opening a path towards multifunctionality (e.g.…”

Section: Introductionmentioning

confidence: 99%

Active deployment of ultra-thin composite booms with piezoelectric actuation

Daye

Lee

2023

Active and Passive Smart Structures and Integrated Systems XVII

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The efficacy of using piezoelectric actuators to initiate the dynamic deployment of bistable composite tape springs is evaluated in this paper. Ultra-thin composite booms such as tape springs and their cross-sectional variants have seen increased popularity in spacecraft structures due to enabling the precise deployment of flexible solar arrays, sails, reflectors, and antennas. They can elastically transition between the deployed “extended” position and the stowed “coiled” position while retaining superior stiffness, thermal properties, mass efficiency, and compactness when compared to thin-shelled metal booms and rigid articulated columns. Bistability in the coiled and extended states allows the boom to exhibit more controllable self-deployment and become reconfigurable, which could allow spacecraft to relocate, redeploy, and adapt to changing environmental conditions or mission objectives. Deployment systems commonly include motors and mechanical restraints that significantly contribute to mechanical complexity and spacecraft weight. Since bistable booms do not rely on elastic instability of packaging to initiate motion, a non-intrusive and lightweight actuation mechanism is needed to trigger deployment. This paper experimentally demonstrates how a Macro Fiber Composite (MFC) actuator can statically and dynamically excite a stowed composite tape spring to initiate unrolling into its extended state.

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“…Precision motion stages are the essential devices in many fields, such as microfabrication [1], microscopy [2], surgery [3] and optical alignment [4]. The piezoelectric actuator is a competitive candidate for driving the precision motion stage due to its merits of high resolution, quick response, and absence of electromagnetic interferences; compared with the * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Study on improving the resolution of an H-shaped piezoelectric ultrasonic actuator by stick-slip principle

Tian

Chen

Liu

et al. 2021

Smart Mater. Struct.

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Improving the performance of the motion stages driven by piezoelectric actuators is an enduring topic for expanding their applications. For the motion stage with a travel range of tens of millimeters, trade-offs are inevitable between getting high speed (hundreds of millimeters per second) and high resolution (tens of nanometers), due to the inherent limitations of the operating principles of the piezoelectric actuators. In order to improve the output resolution of an H-shaped piezoelectric ultrasonic actuator, sawtooth excitation voltages are used in this work rather than the conventional sinusoidal voltages in previous works. The configuration and operating principle of the actuator are discussed in detail. The actuator consists of two vertical and two horizontal longitudinal transducers. The ends of the vertical transducers act as the driving tips and drive the stage forward with the alternating slow extensions and rapid contraction, during which stick motions and slip motions of the stage are acquired. An analytic model is developed to estimate the horizontal and vertical output displacement of the driving tip. The maximum error between the predicted value of the analytical model and the experimental value is about 14%. A prototype of the motion stage is fabricated and experiments are carried out to evaluate its output characteristics. The experiment results confirm the operating principle and show that the resolution is upgraded to tens of nanometers. The prototype obtains a resolution of 19 nm, a maximum speed of 2.22 μm s−1, and a maximum carrying load of 16.94 kg.

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A multifunctional high strain composite (HSC) hinge for deployable in-space optomechanics

Cited by 8 publications

References 22 publications

A neural network-informed self-aware deployable structure with application to phased array antennas

A neural network-informed self-aware deployable structure with application to phased array antennas

Active deployment of ultra-thin composite booms with piezoelectric actuation

Study on improving the resolution of an H-shaped piezoelectric ultrasonic actuator by stick-slip principle

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