Injuries in the elbow area, such as lateral and medial epicondylitis, are the leading causes of consultation with health specialists. Therefore, this research proposes the mechatronic design of an orthosis with a graphic interface that supports professionals in the rehabilitation of the elbow joint through the execution of flexion-extension and pronation-supination movements. For the development of the rehabilitation prototype, mechatronic design, co-design, and IDEF0 methodologies are used, performing activities such as actuator characterization, simulations, and modeling, among others. Through the execution of a case study in a real environment, the device was validated, where the results suggest a functional and workable prototype that supports the treatment of pathologies in the elbow area through the execution of the mentioned movements, supposing that this is a low-cost alternative with elements to improve, such as the industrial design and new functionalities. The developed proposal shows potential as an economical product that health professionals can use. However, some limitations related to the design and functionalities in the application domain were identified.
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http://dx.doi.org/10.3390/bioengineering9070287 | DOI Listing |
Materials (Basel)
March 2025
The Academy of Applied Studies Polytechnic, Katarine Ambrozić 3, 11000 Belgrade, Serbia.
This research investigates the aeroelastic stability of tapered polylactic acid (PLA) plates produced through fused deposition modeling (FDM) under low-Mach-number airflow conditions. While the static properties of 3D-printed structural components for drones, unmanned aerial vehicles (UAVs), and unmanned aircraft systems (UAS) have been thoroughly explored, their dynamic behavior, especially flutter, has been less studied. This study applies a binary flutter model to thin PLA plates, and the analytically predicted flutter speeds are compared with experimental data from wind-tunnel tests.
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February 2025
Department of Mechatronics and Mechanical Systems Engineering, Polytechnic School of Engineering, University of Sao Paulo, Av. Prof. Mello Moraes, 2231, Sao Paulo 05508-030, Brazil.
The use of parts containing internal channels fabricated by laser powder bed fusion (LPBF) in maraging steel is gaining attention within industry, due to the promising application of the material in molds and forming tools. However, LPBF processing has issues when it comes to unsupported channels, leading to defects that can result in a limited performance and shortened component life. The present study aims to provide a detailed evaluation of the metallurgical effects arising from the LPBF printing of channels made of maraging 300 steel.
View Article and Find Full Text PDFLangmuir
March 2025
Jiangxi Province Key Laboratory of Light Alloy, School of Advanced Manufacturing, Nanchang University, Nanchang 330031, P.R. China.
Herein, a superhydrophobic surface was designed and fabricated based on the "lotus effect" construction mechanism. The zeolitic imidazolate framework (ZIF-90) micro-nanoparticles were initially synthesized via a one-pot method, combined with long-chain stearic acid (STA), and subsequently embedded in polyvinyl butyral (PVB) to form a superhydrophobic surface at room temperature. The superhydrophobic surface demonstrated mechanical stability and retained its superhydrophobicity with a water contact angle (CA) greater than 150°, even at a wear distance of 400 cm.
View Article and Find Full Text PDFWearable Technol
March 2025
Department of GMSC, Pprime Institute CNRS, UPR 3346, ISEA-ENSMA, University of Poitiers, Poitiers, France.
This article presents a bioinspired pneumatic soft actuator designed to mimic the flexo-extension movement of the human finger, with a particular focus on stiffness modulation through granular jamming. Three-chamber geometries - honeycomb, rectangular, and half-round - were evaluated to optimize curvature performance, utilizing Mold Star 15 Slow elastomer for actuator fabrication. Granular jamming, both passive and active, was implemented within the inextensible layer using chia and quinoa grains to enhance stiffness modulation.
View Article and Find Full Text PDFSci Rep
March 2025
Deaprtment of Mechatronics and Industrial Engineering, Chittagong University of Engineering and Technology, Chattogram, 4349, Bangladesh.
The shift to online learning during the COVID-19 pandemic presented significant challenges and opportunities, particularly in developing nations like Bangladesh, where digital infrastructure is limited. This study compares the effectiveness of online and offline learning for Bangladeshi engineering students using the Best Worst Method (BWM), a robust decision-making tool that simplifies the analysis by focusing on the best and worst criteria, ensuring consistency and accuracy. Eight key factors, including cost, flexibility, learning effectiveness, and technological challenges, were evaluated to identify the distinct strengths and limitations of each learning modality.
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