Quasi-static folding and deployment of rigidizable inflatable beams

Wei, Jianzheng; Ding, Haixin; Chai, Yu; Eriksson, Anders; Tan, Huifeng

doi:10.1016/j.ijsolstr.2021.111063

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…Conversely, as the radius of expansion increased with different FPA types, the angle corresponding to maximum extension torque also rose. Although this trend may initially appear paradoxical, it aligns with prior research examining the resilience of inflatable tubes when bent [36]. Such tubes, when bent past a particular angle, tend to exhibit wrinkling at the bend, thereby diminishing the restoring force.…”

Section: Evaluation Of Actuators With Dummy Fingersupporting

confidence: 71%

Bidirectional Support for Individual Finger Joints in Soft Rehabilitation Gloves: Integration of Foldable Pouch Actuators With Modular Elastomeric Actuators

Kokubu,

Tortós Vinocour,

2024

IEEE Access

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In recent years, a proliferation of soft actuators tailored for hand rehabilitation has been observed. In particular, modular soft actuators have garnered particular interest due to their capacity for individual customization and joint-specific support, a feature often lacking in whole-finger soft actuators. Despite these advancements, a significant limitation persists: the majority of these actuators facilitate only finger flexion, neglecting the equally vital extension movements required for comprehensive hand rehabilitation. Traditional approaches to achieving multi-degree-of-freedom or bidirectional motion have relied on the integration of multiple chambers within soft actuators. However, this strategy has proven impractical for modular soft actuators, primarily due to spatial constraints within the finger joint. To address this challenge, we introduce a foldable pouch actuator (FPA). Designed as a flat, foldable structure composed of a single sheet, the FPA expands solely upon pressurization, generating the requisite force for finger extension. Notably, the FPA seamlessly integrates with existing modular soft actuators without compromising their structural integrity or functional capabilities, thereby enabling bidirectional support for individual joints. Evaluations using a synthetic finger model achieved a joint flexion torque of 0.17 Nm and estimated an overall extension torque of 0.12 Nm. These advancements were accomplished without compromising the traditional flexion functionality, adding individual joint extension support to the existing capabilities. This study constitutes a substantive leap forward in the utilization of soft actuators for clinical hand rehabilitation applications.INDEX TERMS soft robotics, soft actuator, hand rehabilitation, finger-motion assistance, active extension support, bidirectional support.While initial research efforts have primarily concentrated

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Section: Evaluation Of Actuators With Dummy Fingersupporting

confidence: 71%

Bidirectional Support for Individual Finger Joints in Soft Rehabilitation Gloves: Integration of Foldable Pouch Actuators With Modular Elastomeric Actuators

Kokubu,

Tortós Vinocour,

2024

IEEE Access

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“…[7][8][9][10] At present, the membrane body is usually made of polyvinyl chloride (PVC) membrane or PVC-coated two-dimensional fabric material. 11,12 Although traditional inflatable membrane materials have good energy absorption capacity, they still have some limitations on the shape stability and rigidity of the structure. 13 Because of their excellent characteristics such as lightweight, high strength, designability, and portability, high-distance spacer fabric flexible inflatable composites, which are prepared by compounding fabric (generally refers to a spacer fabric with spacer filaments more than 50 mm) 14 with PVC, are widely used in inflatable building, tents, aircraft wings, boats, and other consumer industries.…”

Section: Introductionmentioning

confidence: 99%

“…13 Because of their excellent characteristics such as lightweight, high strength, designability, and portability, high-distance spacer fabric flexible inflatable composites, which are prepared by compounding fabric (generally refers to a spacer fabric with spacer filaments more than 50 mm) 14 with PVC, are widely used in inflatable building, tents, aircraft wings, boats, and other consumer industries. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] In contrast with conventional spacer fabrics, the spacer yarns' main role in the highdistance fabric is to serve as a connecting pile in the fabric and allow the fabrication of inflatable composites with more complex cross-sectional geometries. [18][19][20] Therefore, the high-distance spacer fabric flexible inflatable composites can bear the loading by stabilizing the shape and rigidity of the structure.…”

Section: Introductionmentioning

confidence: 99%

Compressive properties investigation of “stress transformer” based on high-distance woven spacer fabric design

Zhao

Jiang

You³

et al. 2023

Journal of Industrial Textiles

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High-distance woven spacer fabrics have been developed into a variety of special textile products for a wide range of applications. As a type of sandwich structure, their applications are heavily dependent on their compressive properties. In this study, the compressive properties of high-distance woven spacer flexible inflatable composites (HDWSFICs) have been evaluated by varying the indenter diameter, initial inflation pressure, and spacer yarn density. The experimental results showed that the compression process can be divided into three stages, including the Contact Stage, the Stress Transition Stage and the Densification Stage. In the Stress Transition Stage, the HDWSFICs can transform compressive load into tension stress, and especially local stress into integral stress, which can be considered a “Stress Transformer”. The existence of the spacer yarns allows the inflatable composites to bear more than three times the compressive load of the inflatable membrane material itself. The compressive modulus increases with spacer yarn density and initial inflation pressure, thus the stiffness of HDWSFICs can be designed. The findings of this study may provide ideas for the design of a “Stress Transformer” and theoretical references for the development of high-distance woven spacer inflatable composites with excellent mechanical properties.

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Development simulation of an inflatable membrane antenna based on extended position-based dynamics

Peng

et al. 2022

Acta Mech. Sin.

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Quasi-static folding and deployment of rigidizable inflatable beams

Cited by 9 publications

References 21 publications

Bidirectional Support for Individual Finger Joints in Soft Rehabilitation Gloves: Integration of Foldable Pouch Actuators With Modular Elastomeric Actuators

Bidirectional Support for Individual Finger Joints in Soft Rehabilitation Gloves: Integration of Foldable Pouch Actuators With Modular Elastomeric Actuators

Compressive properties investigation of “stress transformer” based on high-distance woven spacer fabric design

Development simulation of an inflatable membrane antenna based on extended position-based dynamics

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