The Design and Application of an Advanced System for the Diagnosis and Treatment of Flatfoot Based on Infrared Thermography and a Smart-Memory-Alloy-Reinforced Insole

Prosthesis, Journal Year: 2024, Volume and Issue: 6(6), P. 1491 - 1509

Published: Dec. 9, 2024

Background: Flatfoot deformity is a common condition in children and teenagers that may increase the risk of knee, hip, back pain. Most insoles suggested to treat flatfoot symptoms are not designed adapt foot temperature during walking, they either too soft provide support or hard enough be uncomfortable. Purpose: This study aims develop an advanced solution diagnose flexible (FFT) using infrared thermography measurements hybrid insole reinforced by nitinol (NiTiCu) smart-memory-alloy wires (SMAWs), this super-elastic alloy can return its pre-deformed shape when heated, which helps reduce local high-temperature points caused uneven pressure FFT. approach achieves more uniform thermal distribution across foot, makes comfortable. Methods: The involved 16 subjects, divided into two groups eight flat-footed normal. procedure includes parts, namely, designing prototype with SMAW properties based on measurement SolidWorks, evaluating design Ansys. Second, SMAWs customized for subjects. differences between medial lateral sides metatarsophalangeal line compared normal before after wearing design. Results: results show our safely diagnosed FFT significantly improved subjects than 80% A paired t-test reported significant (p-value > 0.001) decreases insole, was closely approximated Conclusions: SMAW-reinforced comfortable suitable treating deformity, effective tool evaluate deformity.

Language: Английский

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Mathematical modelling and experimental study of a novel planar micro-positioning stage using shape memory alloy actuators

Smart Materials and Structures, Journal Year: 2023, Volume and Issue: 32(12), P. 125001 - 125001

Published: Oct. 16, 2023

Abstract The application of smart materials as actuators in precise positioning systems has witnessed significant growth recent years. However, the use shape memory alloy (SMA) this context is hindered by their slow response and complex nonlinear behaviour. To overcome these limitations, paper introduces a novel approach that incorporates two opposite SMA into flexure hinge type micro-positioning stage, aiming to enhance system speed. A semi-analytical modelling employed model behaviour actuator. Using available material models for curved beam theory, governing equations proposed actuator are derived resulted partial differential reduced an algebraic equation based on Galerkin method. resulting then solved using return map validate accuracy effectiveness model, experimental setup constructed. results demonstrate ability accurately predict system. Additionally, developed allows extraction stress strain profiles designing study highlights potential integrating with robust control methods future works, effectively further performance.

Language: Английский

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Laser Deposition of Titanium Layer to Enhance Two-Way Shape Memory Behavior of Nitinol Sheet

Published: Jan. 1, 2024

One of the long-standing mechanical challenges associated with shape memory alloys (SMAs) is achieving and stabilizing an evolving two-way effect (TWSME) through thermomechanical training/cycling. In most martensitic NiTi SMAs that exhibit zero TWSME at room temperature, TWSMEs typically require hundreds cycling repetitions to track trivial values. This demonstrates a promising solution overcome this challenge. The surface SMA sheets was treated by depositing certain number titanium (Ti) powder layers on using laser beam. results showed unique approximately 12% good stability achieved after 100 cycles when optimum five Ti deposited, which much higher than sheet (0.3% TWSME) sample single-time path irradiation (1.8%). attributed low coefficient thermal expansion vs. sheet, prevented reverse bending during heating, formation Ti-rich intergranular Ti2Ni(Ox) precipitates, hindered dislocation movement. Meanwhile, in sample, owing generation large residual tensile stress heat-affected zone led reduction plastic zones, one-way (OWSME) retained values above 90% over cycling. However, introduction additional can cause problems terms oxygen accumulation within should be considered designing product.

Language: Английский

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Design and Control of a Shape Memory Alloy-Based Idle Air Control Actuator for a Mid-Size Passenger Vehicle Application

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(11), P. 4784 - 4784

Published: May 31, 2024

The idle air control actuator is an important device in automotive engine management systems to reduce fuel consumption by controlling the engine’s idling operation. This research proposes innovative (IAC) for vehicle applications utilizing shape memory alloy (SMA) technology. proposed leverages unique properties of SMAs, such as ability undergo large deformations upon thermal activation, achieve precise and rapid controls intake engines during conditions. structure mechanism consists SMA spring antagonistic made from steel. design process utilizes both numerical analytical approaches. electrically supplied activate opening actuator, its closing state does not need electricity. However, PID controller used applied current, which reduces time taken actuation strokes. It shows good operability within multiple numbers operation cycles. Additionally, performance designed evaluated through mathematical algorithms integrating it into system operating results demonstrate effectiveness SMA-based achieving bypass, thereby improving

Language: Английский

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Reliability Assessment of Shape Memory Alloy Parts Based on a Probabilistic Approach

Lecture notes in mechanical engineering, Journal Year: 2024, Volume and Issue: unknown, P. 356 - 364

Published: Jan. 1, 2024

Language: Английский

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