Abstract
Flexible dielectric elastomeric actuators (DEAs) have become significant in soft robots with intelligent systems. They overcome the shortcomings of traditional rigid systems, thereby expanding their applications in wearable devices. However, existing soft robot end-effectors have limited grasping adaptability and often require a complex coupling of sensors and control algorithms to achieve application data-driven smart grasping. This complexity significantly increases manufacturing costs and design difficulties. In this context, we present a simple, adaptive, and versatile double-finger soft gripper (DFSG) driven by a conical DEA to achieve compliant grips. The DFSG consists of three main parts: a conical actuator, clamp, and force transmission mechanism. Initially, we optimize the output performance of the conical actuator by tailoring its geometric structure, preload force, and bias voltage. The DFSG exploits the tapered actuator's characteristic of large vertical displacement (i.e., large input force) by utilizing the efficient displacement amplification function (up to 9 times) of the designed force transmission mechanism. It converts the input force in the vertical direction into a gripping force in the horizontal direction. As a result, the developed DFSG can easily grasp not only regular and stiff objects but also challenging objects such as small, irregular, soft, or squeezable items. Notably, it can clamp up to 14.5 times its own weight with just one layer of DEA. This work provides guidance for designing soft grippers with adaptive and high reliability, offering a promising avenue for the advancement of soft robotic systems.
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The datasets used during the current study are available from the corresponding author upon reasonable request.
References
Tolley MT et al (2014) A resilient, untethered soft robot. Soft Robot 1(3):213–223
Kellaris N et al (2021) Spider-inspired electrohydraulic actuators for fast soft-actuated joints. Adv Sci https://doi.org/10.1002/advs.202100916
Kellaris N et al (2018) Peano-HASEL actuators: muscle-mimetic, electrohydraulic transducers that linearly contract on activation. Sci Robot. https://doi.org/10.1126/scirobotics.aar3276
Liu Y et al (2021) Bioinspired triboelectric soft robot driven by mechanical energy. Adv Funct Mater https://doi.org/10.1002/adfm.202104770
Qiu Y et al (2019) Dielectric elastomer artificial muscle: materials innovations and device explorations. Acc Chem Res 52(2):316–325
Chen Z et al (2021) Ultrasoft-yet-strong pentablock copolymer as dielectric elastomer highly responsive to low voltages. Chem Eng J 405:126634
Di K et al (2021) Dielectric elastomer generator for electromechanical energy conversion: a mini review. Sustainability 13(17):9881
Wiranata A et al (2021) High-Frequency, low-voltage oscillations of dielectric elastomer actuators. Appl Phys Expr 15(1):011002
Li C et al (2023) Recyclable thermally conductive poly(butylene adipate-co-terephthalate) composites prepared via forced infiltration. SusMat 3(3):345–361
Xu J et al (2021) Self-healing high-performance dielectric elastomer actuator with novel liquid-solid interpenetrating structure. Comp Part A: Appl Sci Manuf 149:106519
Minaminosono A et al (2019) A deformable motor driven by dielectric elastomer actuators and flexible mechanisms. Front Robot AI. https://doi.org/10.3389/frobt.2019.00001
Romasanta LJ, Lopez-Manchado MA, Verdejo R (2015) Increasing the performance of dielectric elastomer actuators: a review from the materials perspective. Prog Polym Sci 51:188–211
Wang N et al (2017) Advances in dielectric elastomer actuation technology. Sci China Technol Sci 61(10):1512–1527
Youn J-H et al (2020) Dielectric elastomer actuator for soft robotics applications and challenges. Appl Sci 10(2):640
Bruschi A et al (2021) Dielectric elastomer actuators, neuromuscular interfaces, and foreign body response in artificial neuromuscular prostheses: a review of the literature for an in vivo application. Adv Healthcare Mater 10(3):2100041
Cao X et al (2019) Review of soft linear actuator and the design of a dielectric elastomer linear actuator. Acta Mech Solida Sin 32(5):566–579
Zhao H et al (2020) A wearable soft haptic communicator based on dielectric elastomer actuators. Soft Rob 7(4):451–461
Shintake J et al (2018) Soft biomimetic fish robot made of dielectric elastomer actuators. Soft Robot 5(4):466–474
Christianson C et al (2018) Translucent soft robots driven by frameless fluid electrode dielectric elastomer actuators. Sci Robot. https://doi.org/10.1126/scirobotics.aat1893
Ji X et al (2019) An autonomous untethered fast soft robotic insect driven by low-voltage dielectric elastomer actuators. Sci Robot. https://doi.org/10.1126/scirobotics.aaz6451
Sun W et al (2016) Soft mobile robots driven by foldable dielectric elastomer actuators. J Appl Phys. https://doi.org/10.1063/1.4960718
Dwivedy SK, Eberhard P (2006) Dynamic analysis of flexible manipulators, a literature review. Mech Mach Theory 41(7):749–777
Rothemund P et al (2020) HASEL artificial muscles for a new generation of lifelike robots—recent progress and future opportunities. Adv Mater 33(19):2003375
Kellaris N et al (2019) An analytical model for the design of Peano-HASEL actuators with drastically improved performance. Extreme Mech Lett 29:100449
Tynan L et al (2021) Implementation of the biological muscle mechanism in HASEL actuators to leverage electrohydraulic principles and create new geometries. Actuators 10(2):38
Ben-Haim E et al (2020) Single-input control of multiple fluid-driven elastic actuators via interaction between bistability and viscosity. Soft Robot 7(2):259–265
Bu K et al (2022) Biomimetic aquatic robots based on fluid-driven actuators: a review. J Marine Sci Eng 10(6):735
Acome E et al (2018) Hydraulically amplified self-healing electrostatic actuators with muscle-like performance. Science 359(6371):61–65
Zhang X et al (2011) Optically- and thermally-responsive programmable materials based on carbon nanotube-hydrogel polymer composites. Nano Lett 11(8):3239–3244
Kim H et al (2018) Thermally responsive torsional and tensile fiber actuator based on graphene oxide. ACS Appl Mater Interfaces 10(38):32760–32764
Behl M et al (2013) Temperature-memory polymer actuators. Proc Natl Acad Sci 110(31):12555–12559
Xu Z et al (2019) High actuated performance MWCNT/Ecoflex dielectric elastomer actuators based on layer-by-layer structure. Comp Part A: Appl Sci Manuf 125:105527
Zhang Y et al (2019) Electrical and mechanical self-healing in high-performance dielectric elastomer actuator materials. Adv Funct Mater 29(15):1808431
Lu T, Ma C, Wang T (2020) Mechanics of dielectric elastomer structures: a review. Extreme Mech Lett 38:100752
Shi Y et al (2022) A processable, high-performance dielectric elastomer and multilayering process. Science 377(6602):228–232
Sahu D, Sahu RK, Patra K (2021) In-plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer. J Appl Poly Sci 139(5):51594
Sun H et al (2019) The role of dipole structure and their interaction on the electromechanical and actuation performance of homogeneous silicone dielectric elastomers. Polymer 165:1–10
Nie R-P et al (2022) Dynamic chemical bonds design strategy for fabricating fast room-temperature healable dielectric elastomer with significantly improved actuation performance. Chem Eng J 439:135683
Li C et al (2019) Electrically induced soft actuators based on thermoplastic polyurethane and their actuation performances including tiny force measurement. Polymer 180:121678
Xiao Y et al (2020) Anisotropic electroactive elastomer for highly maneuverable soft robotics. Nanoscale 12(14):7514–7521
Zhou F, Zhang M, Cao X, Zhang Z, Chen X, Xiao Y et al (2019) Fabrication and modeling of dielectric elastomer soft actuator with 3D printed thermoplastic frame. Sens Actuators A-Phys 292:112–120
Li J, Liu L, Liu Y, Leng J (2019) Dielectric elastomer spring-roll bending actuators: applications in soft robotics and design. Soft Robot 6:69–81
Yao J, Liu X, Sun H, Liu S, Jiang Y, Yu B et al (2021) Thermoplastic polyurethane dielectric elastomers with high actuated strain and good mechanical strength by introducing ester group grafted polymethylvinylsiloxane. Ind Eng Chem Res 60:4883–4891
Ciarella L, Richter A, Henke E-F-M (2023) Integrated logic for dielectric elastomers: replicating the reflex of the venus flytrap. Adv Mater Technol 8(12):2202000
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The authors would like to express their gratitude to all their colleagues.
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This work was supported by National Natural Science Foundation of China (No. 52003019), Yong Elite Scientists Sponsorship Program by CAST (No. 2022QNRC001), and Talents Introduction Project in Beijing University of Chemical Technology (No. buctrc201909).
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Li, N., Xue, Y., Li, Y. et al. A soft gripper driven by conical dielectric elastomer actuator to achieve displacement amplification and compliant grips. Intel Serv Robotics 17, 993–1003 (2024). https://doi.org/10.1007/s11370-024-00553-2
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DOI: https://doi.org/10.1007/s11370-024-00553-2