Characterization of Damping Properties in 3D Printed Structures

Gietl, Jenna; Vignola, Joseph F.; Sterling, John; Ryan, Teresa J.

doi:10.1088/1742-6596/1149/1/012002

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…Mechanical tests showed that the system was durable enough to withstand maximum tibial acceleration (2 g) when walking over enough cycles to meet ISO 22657 requirements [53,54]. It was also tested for natural resonance frequencies based on ISO 7626-5:2019 while keeping in mind the natural frequencies of running and walking [55,[57][58][59]. The system did not have any resonance frequencies between 0.1 and 10 Hz which includes low frequency walking as well as running frequencies which average around 4.1 Hz [55].…”

Section: Discussionmentioning

confidence: 99%

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

et al. 2022

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Objective. Lower limb amputees suffer from a variety of functional deficits related to the absence of sensory communication between the central nervous system and the lost extremity. Indeed, they experience high risk of falls, asymmetric walking and balance, and low prosthesis embodiment, that significantly decrease their quality of life. Presently, there are no commercially available devices able to provide sensory feedback to leg amputees. Recently, some invasive solutions (i.e. requiring a surgery) have been proposed by different research groups, however a non-invasive effective alternative exploitable in everyday life is still missing. Approach. To address this need we developed and tested a lightweight, non-invasive, wearable technology (NeuroLegs) providing sensory (i.e. knee angle joint and tactile) feedback to the users through electro-cutaneous stimulation. A user-friendly GUI and mobile App have been developed to easily calibrate and control the system. Standard mechanical and electrical tests were performed to assess the safety and reliability of the technology. Main results. No mechanical failures, stable communication among system parts and a long-lasting battery (>23h) were demonstrated. The NeuroLegs system was then verified in terms of accuracy in measuring relevant gait parameters in healthy participants. A high temporal reliability was found when detecting stride features (important for the real-time configuration) with a correct match to the walking cadence, in all assessed walking conditions. The effectiveness of the NeuroLegs system at improving walking of three transfemoral amputees was then verified in movement laboratory tests. Increased temporal gait symmetry and augmented confidence were found. Stepping outside from the lab, Neurolegs was successfully exploited by a transfemoral amputee in CYBATHLON Global Edition 2020 in several challenging situations related to daily-living activities. Significance. Our results demonstrate that the NeuroLegs system provides the user with useful sensory information that can be successfully exploited in different walking conditions of daily life.

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Section: Discussionmentioning

confidence: 99%

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

et al. 2022

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“…Most importantly, the cost of production will be reduced and the related time will be shorter, as well as less space is required for installing 3D-printed thermoplastic SOA. Gietl et al 59 investigated the sensitivity of the subordinate oscillator array (SOA) as a 3D-printed structure to the imperfections ensued from changing the printing parameters. There is also an emphasis on how the manufacturing parameters could affect the damping and natural frequency of the 3D-printed structures with considering the external sources that could cause additional damping, such as the environment and base attachment.…”

Section: Metamaterialsmentioning

confidence: 99%

Advances in mechanical metamaterials for vibration isolation: A review

Rifaie

Abdulhadi

Mian

2022

Advances in Mechanical Engineering

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The adverse effect of mechanical vibration is inevitable and can be observed in machine components either on the long- or short-term of machine life-span based on the severity of oscillation. This in turn motivates researchers to find solutions to the vibration and its harmful influences through developing and creating isolation structures. The isolation is of high importance in reducing and controlling the high-amplitude vibration. Over the years, porous materials have been explored for vibration damping and isolation. Due to the closed feature and the non-uniformity in the structure, the porous materials fail to predict the vibration energy absorption and the associated oscillation behavior, as well as other the mechanical properties. However, the advent of additive manufacturing technology opens more avenues for developing structures with a unique combination of open, uniform, and periodically distributed unit cells. These structures are called metamaterials, which are very useful in the real-life applications since they exhibit good competence for attenuating the oscillation waves and controlling the vibration behavior, along with offering good mechanical properties. This study provides a review of the fundamentals of vibration with an emphasis on the isolation structures, like the porous materials (PM) and mechanical metamaterials, specifically periodic cellular structures (PCS) or lattice cellular structure (LCS). An overview, modeling, mechanical properties, and vibration methods of each material are discussed. In this regard, thorough explanation for damping enhancement using metamaterials is provided. Besides, the paper presents separate sections to shed the light on single and 3D bandgap structures. This study also highlights the advantage of metamaterials over the porous ones, thereby showing the future of using the metamaterials as isolators. In addition, theoretical works and other aspects of metamaterials are illustrated. To this end, remarks are explained and farther studies are proposed for researchers as future investigations in the vibration field to cover the weaknesses and gaps left in the literature.

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“…They used impact loading that was caused by extreme damping. (Gietl et al, 2018), investigated 3D printed parts' damping properties measured and compared with the manufacturer's values. They use the COMSOL Multiphysics software to design samples by predicting eigenvalues or bending modes for cantilever beams.…”

Section: Introductionmentioning

confidence: 99%

Effect of Coating on the Specific Properties and Damping Loss Factor of Ultem 1010

2021

ZJPAS

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The dynamic analysis of the fused deposition modeling (FDM) products is one of the most important topics in investigation of 3D manufacturing nowadays. The purpose of this paper to present the dynamic properties of FDM parts made from ULTEM 1010 with different coating layer thicknesses. The coating process consists of two stages: physical vapor deposition (PVD) to pre-coat the samples with a thin layer of Cu and Cr to prepare samples for the next step, electroplating different layer thickness Cu an outer layer of Ni. COMSOL Multiphysics software is used for finite element analysis of the models for free and forced vibration. The results showed an increase in ultimate tensile strength and Young's modulus with increasing coating thickness. The effect of different coating layer thickness on the natural frequency and damping loss factor was studied. The scanning electron microscope was used to investigate the coating layers in tensile specimens after failure.

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Characterization of Damping Properties in 3D Printed Structures

Cited by 6 publications

References 5 publications

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation

Advances in mechanical metamaterials for vibration isolation: A review

Effect of Coating on the Specific Properties and Damping Loss Factor of Ultem 1010

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