An Intelligent Cad System for Mechanical Design

Chao, Nien-Hua

doi:10.1016/b978-0-08-092602-5.50014-7

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…The goal was to manufacture the torsion spring using existing technologies available at the research institute or in the local market. The DFM guidelines identified design features that are challenging to manufacture using machining processes and thus need to be avoided, such as insufficient or inaccurate designs, excessive number of holes with widely divergent diameters, nonstandard hole diameters, tight tolerances, and sharp corners [33].…”

Section: Design For Manufacturing (Dfm) Approachmentioning

confidence: 99%

Design and Characterization of a Low-Cost and Efficient Torsional Spring for Lumbar Support Exoskeletons

Al-Dahiree¹,

Ghazilla²,

Tokhi³

et al. 2023

Preprint

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The design of torsional springs for Series Elastic Actuators (SEAs) is challenging, especially when it comes to balancing good stiffness characteristics and efficient torque robustness. This study focuses on the design of a lightweight, low-cost, and compact torsional spring for use in rotary series elastic actuator (ES-RSEA) of lumbar support exoskeleton. The exoskeleton is used as an assistive device to prevent lower back injuries. The torsion spring was designed following design for manufacturability (DFM) principles, focusing on minimal space and weight. The design process consisted of determining the potential topology and optimizing the selected topology parameters through finite element method (FEM) to reduce equivalent stress. The prototype was made using a waterjet cutting process with low-cost material (AISI-4140-alloy) and tested using a custom-made test rig. The results showed that the torsion spring had a linear torque-displacement relationship with 99% linearity, and the deviation between FEM simulation and experimental measurements was less than 2%. The torsion spring has a maximum torque capacity of 45.7 Nm and a stiffness of 440 Nm/rad. The proposed torsion spring is a promising option for lumbar support exoskeletons and similar applications requiring high stiffness, low weight-to-torque ratio, and cost-effectiveness.

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Section: Design For Manufacturing (Dfm) Approachmentioning

confidence: 99%

Design and Characterization of a Low-Cost and Efficient Torsional Spring for Lumbar Support Exoskeletons

Al-Dahiree¹,

Ghazilla²,

Tokhi³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The goal was to manufacture the torsion spring using existing technologies available at the research institute or in the local market. The DFM guidelines identified design features that are challenging to manufacture using machining processes and thus need to be avoided, such as insufficient or inaccurate designs, the excessive number of holes with widely divergent diameters, nonstandard hole diameters, tight tolerances, and sharp corners [ 32 ].…”

Section: Design Considerationsmentioning

confidence: 99%

Design and Characterization of a Low-Cost and Efficient Torsional Spring for ES-RSEA

Al-Dahiree

Ghazilla

Tokhi

et al. 2023

Sensors

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The design of torsional springs for series elastic actuators (SEAs) is challenging, especially when balancing good stiffness characteristics and efficient torque robustness. This study focuses on the design of a lightweight, low-cost, and compact torsional spring for use in the energy storage-rotary series elastic actuator (ES-RSEA) of a lumbar support exoskeleton. The exoskeleton is used as an assistive device to prevent lower back injuries. The torsion spring was designed following design for manufacturability (DFM) principles, focusing on minimal space and weight. The design process involved determining the potential topology and optimizing the selected topology parameters through the finite element method (FEM) to reduce equivalent stress. The prototype was made using a waterjet cutting process with a low-cost material (AISI-4140-alloy) and tested using a custom-made test rig. The results showed that the torsion spring had a linear torque-displacement relationship with 99% linearity, and the deviation between FEM simulation and experimental measurements was less than 2%. The torsion spring has a maximum torque capacity of 45.7 Nm and a 440 Nm/rad stiffness. The proposed torsion spring is a promising option for lumbar support exoskeletons and similar applications requiring low stiffness, low weight-to-torque ratio, and cost-effectiveness.

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“…Medical and dental sciences, orthopedics, bioengineered tissues, and medical devices have seen new uses for 3D printing [ 10 , 16 ]. By creating an STL (standard triangle language) file and then 3D printing tiny volume sections together, one may quickly turn 3D models into tangible items [ 17 , 18 ]. The exploration of materials has advanced in recent decades, following significant and notable progress associated with material aspects and technology and fundamentally altering dental materials using restorative approaches [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…These include its ease of manipulation and processing, equipment affordability, and aesthetic appeal. Fracture is a considerable danger because traditional denture bases are prone to mechanical failure, making them brittle [ 17 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Exposure Period and Angle Alteration on the Flexural Resilience and Mechanical Attributes of Photosensitive Resin

Khan

Liang

et al. 2022

Nanomaterials

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Despite the large number of studies addressing the effect of acrylic resin polymerization concerning flexural properties, limited research has been conducted on the manufacturing impact on a polymer’s mechanical properties. Photosensitive resinous materials are used in various engineering applications where they may be exposed to multiple detrimental environments during their lifetime. Therefore, there is a need to understand the impact of an environment on the service life of resins. Thus, flexural tests were conducted to study the effects of exposure time and angle on the flexural strength of resins. Herein, the main objective was to explore the strength, stability, and flexural durability of photosensitive resin (EPIC-2000ST) fabricated at different exposure times (E) and angle deviation varying from 0° to 85° with a 5° increment. The samples in circular rings were manufactured and divided into five groups according to their exposure time (E): 10 s, 20 s, 30 s, 40 s, and 50 s. In each exposure time, we designed rings via SolidWorks software and experimentally fabricated at different oblique angles (OA) varying from 0° to 85° with a 5° increment during each fabrication, i.e., OA = 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, and 85°. Flexural strength was evaluated using a three-point bending test. Optical electron microscopy was used to examines the samples’ exterior, interior, and ruptured surfaces. Our experimental analysis shows that flexural strength was significantly enhanced by increasing exposure time and at higher oblique angles. However, at lower angles and less exposure time, mechanical flexural resilience declines.

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An Intelligent Cad System for Mechanical Design

Cited by 4 publications

References 12 publications

Design and Characterization of a Low-Cost and Efficient Torsional Spring for Lumbar Support Exoskeletons

Design and Characterization of a Low-Cost and Efficient Torsional Spring for Lumbar Support Exoskeletons

Design and Characterization of a Low-Cost and Efficient Torsional Spring for ES-RSEA

Influence of Exposure Period and Angle Alteration on the Flexural Resilience and Mechanical Attributes of Photosensitive Resin

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