This paper presents the numerical simulation of a 3D mechanical design of an ankle exoskeleton for elderly users. The ankle is one of the most injury-prone joints due to its irregular ¾ sphere shape ...and elderly people are more prone to this damage (approximately 80% of patients with a history of ankle sprain undergo surgery for post-traumatic ankle osteoarthritis 1). This problem generates a decrease in muscular resistance on the legs, loss of motor skills, loss of mobile autonomy, etc. The simulation of this exoskeleton is intended to reduce these problems by means of this low-cost mechanism, since similar options exist, but they are not within the economic reach of all. For this reason, anatomical measurements of an elderly user were taken to obtain an ergonomic and easy-to-use mechanical design. Biomechanical calculations were also performed on the ankle to define its displacement and rotation angles. Finally, the designed parts were assembled to validate the mobility of the system and numerical simulations were performed to determine safety coefficients, Von Misses stress, and deformations within the Autodesk Inventor 3D CAD software.
In this paper, a 3D-printed conformal metasurface was used to change the phase of the radiated field from a single microstrip patch antenna. The metasurface had 25 complementary split ring resonators ...(CSRR) and was placed in the radiating far-field of the patch antenna. The conformal metasurface was printed with flexible NinjaFlex (substrate) and Electrifi (conductors) filaments, and the phase shift of the radiated field was achieved by changing the curvature of the conformal metasurface. The proposed system was simulated in HFSS. Furthermore, a prototype was measured, and the results validated the simulation results. The radiation pattern was shown to shift by up to 20 degrees in response to the curved metasurface. This proposed approach could eventually be used to achieve beam steering by combining a conventional patch antenna and 3D-printed metasurfaces.
In this annotated portfolio, we present a posthumanist idea of defining mingling spaces with microorganisms. Using this approach, we explored and extended the current boundary of cultural concerns of ...human beings. Human landmarks, such as buildings, streets, and cities, are usually named after famous people, important events, religious symbols, or a piece of collective memories. From Alexandra (named after the Macedonian King) to Hong Kong (meaning "fragrant harbour"), names of places are lyrical codenames that connect human emotions to a physical space. However, while these names last, the stories they tell often get forgotten. In this work, we propose a new, posthuman narrative for naming places. Microorganisms, the invisible lifeforms that pervade every micrometer of air, water bodies, and land on earth, coevolve and interact with the changing environment of the place they inhabit, accumulating genetic traits along the way. Just like gut microbiota that are unique for each individual human, the composition and genetic variations of the microbes in each location are also unique to that place, shaped by millennia of adaptation. Microorganisms narrate another kind of story, told through their genomes, where "collective memories" are a natural history in which anthropological activities play only a small part. Bacteria, the witness of human kings and heroes, wars and revolutions, ascent and extinction, are the rightful "namesake" of places. Using four landmarks in Hong Kong, a city tossed in endless political and cultural tides in the past 150 years, as our point of departure, we contemplated on the use of bacteria as a new narrative for the posthuman stories associated with places. Alongside the philosophical articulations, we also visualized this idea by fabricating an installation through the interdisciplinary use of 3D printing technology and microbiological procedures.
The foot and ground force directly affect the propulsion performance and stability of quadruped robot. At present, the typical robots' foot, such as flat foot, cylindrical foot and spherical foot, ...are being widely used. However, the bionic foot almost haven't got very good application. This paper presents a kind of bio-inspired equinus model and a mechanical single leg system. The three dimensional model of equinus had been conducted, and 3D printing technology is also been used to produce bio-inspired foot. To compare the ground reaction force on quadruped robot, this paper conducts tests of hemispherical foot and bio-inspired equinus. Experiments show that the propulsive force of bio-inspired equinus is more excellent than hemispherical foot; and the former makes the robot more stable during walking. The experimental result provides the experimental basis and references for the follow-up study on Bio-inspired foot of quadruped robot.
3D 프린트를 통해 제작된 손목 보조기의 유한요소해석 최현우; Hyeun-woo Choi; 강인영 ...
한국방사선학회 논문지,
12/2019, Letnik:
13, Številka:
7
Journal Article
Odprti dostop
임상에서 사용하는 진단 검사 장치인 전산화 단층촬영기와 자동화된 설계 소프트웨어(MediACE 3D Prog ram), 3D 프린터로 손목 보조기를 제작하고자 하였다. 전산화단층촬영기로 상지의 Dicom 파일을 획득한 후 MediACE 3D Program을 통해 손목 보조기를 디자인하여 "STL(stereolithography)"파일을 만들었고, 디자인된 ...손목 보조기는 3D 프린터를 이용하여 인쇄하였다. 3D 프린팅 기술로 제작된 손목보조기의 효용성 검증을 위해 뼈와 피부에 가해지는 압력 및 보조기의 스트레스 분포를 유한요소해석으로 나타내었다. 손목 보조기를 제작할 때 유한요소해석의 결과를 가지고 뼈와 피부가 압력에 의한 손상과 보조기의 파손이 자주 일어나는 부위를 보강하여 손목 보조기를 제작할 수 있을 것이라고 기대된다.
The purpose of this study was to manufacture a wrist brace using a computerized tomography system, clinical design software (MediACE 3D Program), and 3D printer. After acquiring the Dicom file of the upper limb with a computed tomography, the wrist brace was designed using the MediACE 3D Program to create a "stereolithography" file. The designed wrist brace was printed using a 3D printer. To verify the effectiveness of wrist assistive device manufactured by 3D printing technology, the stress distribution of the pressure and orthosis applied to bone and skin is represented by finite element analysis. It is expected that the wrist brace can be manufactured by reinforcing the part where the damage caused by pressure and breakage of the brace frequently occurs with the result of finite element analysis when producing the wrist brace.
A micro-structured polypropylene fiber is proposed for signal transmission at 128 GHz. The 2.5 m-long fiber is 3D printed using a 45° inclined nozzle and is characterized experimentally, which ...demonstrates the prospect of this novel infinite print technique in continuous fabrication of terahertz polymer fibers.
"Corporación Universitaria Autónoma de Nariño (AUNAR) Villavicencio" offers Dental Mechanics as a career to Llanos Orientales region (middle est) of Colombia. Currently, the creation of dental ...prostheses is an artisan work made by students without to implement digital processes. Industry advances are focused on computer-aided design and computer-aided manufacturing (known as CADCAM) for the digital fabrication of dental pieces, improving times, costs and product quality. Is very important to give tools to the student that allow them understand new techniques to create the dental rehabilitations. For this reason an interinstitutional research work is developed between the Corporación Universitaria Autónoma de Nariño AUNAR with the programs of Dental Mechanics and Computer Engineering and the "Corporación Universitaria del Meta UNIMETA" with the participation of the Systems Engineering program, seeking the analysis and operation of the process CADCAM. For this work, photogrammetry techniques are used to capture models of dental works elaborated by the students of dental mechanics, then they are processed in three-dimensional modeling software and subsequently the models are printed on 3D printers. As a result of the research, a virtual learning object is developed that allows students of the first semesters of the Dental Mechanics program to learn the results of dental work with 3D models prepared by students in the last semester.
We present LightTouch, a 3D-printed passive gadget to enhance touch interactions on unmodified capacitive touchscreens. The LightTouch gadgets simulate finger operations such as tapping, swiping, and ...multi-touch gestures by means of conductive materials and light-dependent resistors (LDR) embedded in the object. The touchscreen emits visible light and the LDR senses the level of this light, which changes its resistance value. By controlling the screen brightness, it intentionally connects or disconnects the path between the GND and the touchscreen, thus allowing the touch inputs to be controlled. In contrast to conventional physical extensions for touchscreens, our technique requires neither continuous finger contact on the conductive part nor the use of batteries. As such, it opens up new possibilities for touchscreen interactions beyond the simple automation of touch inputs, such as establishing a communication channel between devices, enhancing the trackability of tangibles, and inter-application operations.
The design of a 3D-printed wideband hyperbolic lens antenna covering the complete Ka-band is presented in this work. The designed lens is totally flat as it is derived after an optic transformation. ...The lens was constructed using a 3D printer with ABS filaments that were characterized with respect to its infill percentage. Different strategies for the manufacturing will be evaluated.
