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Multidirectional 3D printed functionally graded modular joint actuated by TCPFL muscles for soft robots

Bio-Design and Manufacturing 2019年第4期2卷 256-268页

作者： Armita Hamidi Yara Almubarak yonas tadesse Humanoid Bio-robotics and Smart Systems(HBS)LaboratoryMechanical Engineering DepartmentThe University of Texas at DallasRichardsonTX 75080USA

Highly deformable bodies are essential for numerous types of applications in all sorts of environments. Joint-like structures comprising a ball and socket joint have many degrees of freedom that allow mobility of many biomimetic structures. Recently, soft robots are favored over rigid structures for their highly compliant material, high-deformation properties at low forces, and ability to operate in di fficult environments. However, it is still challenging to fabricate complex designs that satisfy application constraints due to the combined e ffects of material properties, actuation method, and structural geometry on the performance of the soft robot. Therefore, a combination of a rigid joint and a soft body can help achieve modular robots with fully functional body morphology. Yet, the fabrication of soft parts requires extensive molding for complex shapes, which comprises several processes and can be time-consuming. In addition, molded connections between extremely soft materials and hard materials can be critical failing points. In this paper, we present a functionally graded 3D-printed joint-like structure actuated by novel contractile actuators. Functionally graded materials (FGMs) via 3D printing allow for extensive material property enhancement and control which warrant tunable functionalities of the system. The 3D-printed structure is made of 3 rigid ball and socket joints connected in series and actuated by integrating twisted and coiled polymer fishing line ( TCPFL) actuators, which are con fined in the FGM accordion-shaped channels. The implementation of the untethered T CPFL actuation system can be highly bene ficial for deployment in environments that require low vibrations and silent actuation. The fishing line TCP actuators produce an actuation strain up to 40% and bend the joint up to 40° in any direction. The T CPFL can be actuated individually or as a group to control the bending trajectory of the modular joint, which is bene ficial when deployed i

关键词： Functionally graded 3D-printed Joint Multidirectional Fishing line TCP

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HM-EH-RT:hybrid multimodal energy harvesting from rotational and translational motions

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International Journal of Smart and Nano Materials 2013年第4期4卷 257-285页

作者： Miles Larkin yonas tadesse Department of Mechanical Engineering Erik Jonsson School of Engineering and Computer ScienceThe University of Texas at DallasRichardsonTX 75080USA

This paper presents a novel hybrid multimodal energy harvesting device consisting of an unbalanced rotary disk that supports two transduction methods,piezoelectric and *** device generates electrical energy from oscillatory motion either orthogonal or parallel to the rotary axis to power electronic *** models for the electromagnetic and piezoelectric systems were developed to describe the mechanical and electrical behavior of the *** these models,numerical simulations were performed to predict power generation *** device was fabricated,and several components were optimized *** energy harvester was then experimentally characterized using a modal shaker in several different *** device generates a maximum RMS power output of 120 mW from the electromagnetic system at 5 Hz and 0.8 g,and 4.23 mW from the piezoelectric system at 20.2 Hz and 0.4 g excitation *** device is 180 mm in diameter and 45 mm thick including the rotor *** size optimization will produce an energy harvester capable of being used as a wearable device to power mobile electronics for multiple applications.

关键词： energy harvesting piezoelectric electromagnetic wearable device multimodal

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