Three-dimensional modelling of wheelchair contrived with lower limb exoskeleton for right hemiplegic dysfunction

2020 ◽  
Vol 234 (7) ◽  
pp. 651-659
Author(s):  
AN Nithyaa ◽  
S Poonguzhali ◽  
N Vigneshwari
Keyword(s):  
Lower Limb ◽  
Computer Aided Design ◽  
Age Groups ◽  
Three Dimensional ◽  
The Body ◽  
Three Dimensional Model ◽  
Design Quality ◽  
Lower Limb Exoskeleton ◽  
Repeated Exercise ◽  
Aided Design

Hemiplegia is a type of paralysis that affects one side of the body due to stroke, characterizing severe weakness or rigid movement. Many people of different age groups are affected by this condition which cannot be completely cured but can be minimized through proper physiotherapy. A continuous and repeated exercise has to be given to the hemiplegic subjects to regain their motor function. To serve this purpose, a three-dimensional model of wheelchair contrived with lower limb exoskeleton is designed and motion analysis is done using SolidWorks. This virtual model of the object is created with the assistance of computer-aided design software. Professionals can be able to do the experiment on what-if scenarios with their three-dimensional designs, which helps to validate their devices and identify any snags with design quality. The pattern of behaviour of lower limb exoskeleton is predicted using SimMechanics in MATLAB.

Computer Aided Design of a Pattern and Risers for Casting Processes: Part 1

1991 ◽  
Vol 113 (1) ◽  
pp. 59-66
Author(s):  
Jong Cheon Park ◽  
Kunwoo Lee
Keyword(s):  
Computer Aided Design ◽  
Unique Feature ◽  
Three Dimensional ◽  
Automatic Design ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
High Quality ◽  
Commercial Practice ◽  
Interactive Computer Program ◽  
Aided Design

An interactive computer program has been developed to design a pattern and risers for the production of castings of high quality. In our system, the user models the shape of a final product by using the system’s modeling capability, a pattern is generated in a three-dimensional model by eliminating the holes and adding shrinkage allowances and drafts, the proper riser is created automatically, and they are united together to yield a three-dimensional model of this portion of a mold assembly. The mold can be completed after the runners and the gating systems are designed, modeled, and united which will be described in Part 2 of this work. The unique feature of this work is a realization of an automatic design of the pattern and risers by integrating the modeling capabilities and the design equations used in commercial practice.

Interpreting Three-Dimensional Shape Distributions

2005 ◽  
Vol 219 (6) ◽  
pp. 553-566 ◽  
Author(s):  
H J Rea ◽  
R Sung ◽  
J R Corney ◽  
D E R Clark ◽  
N K Taylor
Keyword(s):  
Computer Aided Design ◽  
Shape Function ◽  
Three Dimensional ◽  
Shape Functions ◽  
Three Dimensional Model ◽  
Retrieval Systems ◽  
Cad Models ◽  
Dimensional Shape ◽  
Complex Engineering ◽  
Aided Design

Effective content-based shape retrieval systems would allow engineers to search databases of three-dimensional computer-aided design (CAD) models for objects with specific geometries or features. Much of the academic work in this area has focused on the development of indexing schemes based on different types of three-dimensional to two-dimensional ‘shape functions’. Ideally, the shape function used to generate a distribution should be easy to compute and permit the discrimination of both large and small features. The work reported in this paper describes the properties of three new shape distributions based on computationally simple shape functions. The first shape function calculates the arithmetic difference between distributions derived (using the original D2 distance shape function) from both a three-dimensional model and its convex hull. The second shape function is obtained by sampling the angle between random pairs of facets on the object. The third shape function uses the surface orientation to filter the results of a distance distribution. The results reported in this paper suggest that these novel shape functions improve significantly the ability of shape distributions to discriminate between complex engineering parts.

DEVELOPMENT IN CAD OF A THREE-DIMENSIONAL MODEL OF A FOREST PLANTING MACHINES

2021 ◽  
Author(s):  
M.V. Drapalyuk ◽  
◽  
L.D. Bukhtoyarov ◽  
N.Yu. Yurev ◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
Root System ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Maximum Efficiency ◽  
Design System ◽  
Three Dimensional Model ◽  
The Moment ◽  
Aided Design

Currently, the reforestation process has a number of disadvantages, such as the need to use manual labor during the distribution and planting of seedlings; mechanisms for planting seedlings are often equipped with tractors as traction means. The creation of furrows and the preparation of the soil immediately before planting affects the energy consumption of the implements’ drives. At the moment, the inefficiency of planting work is high, since the planting of seedlings with a closed root system occurs in conjunction with a plow. All these factors, when calculated for a long-term period, lead to greater energy consumption when carrying out this type of work. This article discusses approaches to the mechanization of the planting process. Using the experience of planting seedlings with a closed root system (CCS) manually and analyzing the methods of mechanization of planting, it is possible to obtain maximum efficiency when carrying out this type of work. Based on the material studied, a prototype of a planting device suitable for the technology of discrete planting of seedlings with ZKS was selected. Solid modeling of the working body in the Solidworks computer-aided design system has been carried out. When designing the model, the possibility of its production using additive technology using the FDM printing method was envisaged.

scholarly journals MODELING OF 3D PRINTING PROCESSES IN QUALITY MANAGEMENT OF THE CONSTRUCTION OF A PHYSICAL MODEL OF AN OBJECT

2019 ◽  
Vol 2019 (1) ◽  
pp. 10-15
Author(s):  
Александр Чабаненко ◽  
Alexander Chabanenko
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Additive Technologies ◽  
The Body ◽  
Third Party ◽  
Layer By Layer ◽  
Additional Advantage ◽  
Automatic Production ◽  
Additional Equipment ◽  
Aided Design

In recent years, the methods of layer-by-layer synthesis of prototype products, which is included in additive technologies, have formed a fundamentally new direction in technology, where it is necessary to produce experimental, single, exclusive and unique product samples. The fundamental difference between these methods is that the finished part is obtained not by removing a layer of material from the workpiece, as is customary in traditional methods of processing, and due to the layer-by-layer build-up of the material while obtaining a given shape and size of the product. At the same time, the main feature of these methods is the mandatory use of three-dimensional computer-aided design of the product as the initial stage of layer-by-layer synthesis technology. The use of these technologies is particularly promising in the production of housing elements of electronic equipment due to the ability to consider the specifics of the equipment. The use of additive technologies provides an increase in performance and a decrease in the influence of the form factor of the body at the production stage. An additional advantage of the additive installation is that in the manufacture of preforms are not required to resort to third-party technological solutions in the form of cutting, grinding, welding, which requires additional equipment and the involvement of qualified specialists. With the help of modeling mechanisms of 3D printers, it is possible to provide fully automatic production of preforms, having an additive installation. A process control additive production will ensure the quality of the final product.

The development of a low-cost three-dimensional printed shoulder, arm, and hand prostheses for children

2016 ◽  
Vol 41 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Jorge M Zuniga ◽  
Adam M Carson ◽  
Jean M Peck ◽  
Thomas Kalina ◽  
Rakesh M Srivastava ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Low Cost ◽  
Three Dimensional ◽  
Cost Effective ◽  
Research Participant ◽  
The Body ◽  
Shoulder Prosthesis ◽  
Main Function ◽  
And Performance ◽  
Aided Design

Background and aim: The prosthetic options for higher level amputees are limited and costly. Advancements in computer-aided design programs and three-dimensional printing offer the possibility of designing and manufacturing transitional prostheses at very low cost. The aim of this project was to describe an inexpensive three-dimensional printed mechanical shoulder prosthesis to assist a pre-selected subject in performing bi-manual activities. Technique: The main function of the body-powered, manually adjusted three-dimensional printed shoulder prosthesis is to provide a cost-effective, highly customized transitional device to individuals with congenital or acquired forequarter amputations. Discussion: After testing the prototype on a young research participant, a partial correction of the patient’s spinal deviation was noted due to the counterweight of the device. The patient’s family also reported improved balance and performance of some bimanual activities after 2 weeks of using the device. Limitations of the design include low grip strength and low durability. Clinical relevance The prosthetic options for higher level amputees are limited and costly. The low-cost three-dimensional printed shoulder prosthesis described in this study can be used as a transitional device in preparation for a more sophisticated shoulder prosthesis.

Development and Research of PVT Modules in Computer-Aided Design and Finite Element Analysis Systems

2020 ◽  
pp. 314-342 ◽  
Author(s):  
Vladimir Panchenko ◽  
Valeriy Kharchenko
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Computer Aided ◽  
Three Dimensional Models ◽  
Analysis System ◽  
Aided Design

This chapter discusses the simulation of solar photovoltaic thermal modules of planar and concentrator structures in computer-aided design systems KOMPAS 3D and finite element analysis ANSYS. To create photovoltaic thermal modules, a method for designing their three-dimensional models in the computer-aided design system has been developed. To study the thermal regimes of the created three-dimensional models of modules, a method has been developed for visualizing thermal processes, coolant velocity, and flow lines of a cooling agent in a finite element analysis system. As a result of calculations in the finite element analysis system using the developed method, conclusions can be drawn about the feasibility of the design created with its further editing, visualization of thermal fields, and current lines of the radiator cooling agent. As an illustration of the simulation results, a three-dimensional model of a photovoltaic thermal planar roofing panel and an optimized three-dimensional model of a photodetector of a solar concentrator photovoltaic thermal module are presented.

Roofing Solar Panels of Planar and Concentrator Designs

2020 ◽  
Vol 9 (4) ◽  
pp. 20-40
Author(s):  
Vladimir Panchenko
Keyword(s):  
Computer Aided Design ◽  
Raw Materials ◽  
Three Dimensional ◽  
Design System ◽  
Solar Panels ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Initial Stage ◽  
The Cost ◽  
Aided Design

Solar roofing panels fulfill both building protective functions and energy generating ones. The composition of the substrate of the solar roofing panel includes secondary raw materials, which has a positive effect on the environment. To increase the electrical efficiency and also to obtain thermal energy in the form of warm water, it was proposed to create a photovoltaic thermal roofing panel. For this purpose, the presented article describes the method of creating a three-dimensional model of solar photovoltaic thermal modules in a computer-aided design system. The article also proposes a method for manufacturing a prototype body for a solar roofing panel, manufactured using additive technologies, which will significantly reduce costs at the initial stage of creating a prototype due to the possibility of operational changes to a three-dimensional model followed by printing a modified and optimized model. To reduce the number of photovoltaic cells and the cost of a solar roofing panel, it is proposed to use a solar concentrator in the panel.

Simulation of a three-dimensional craniofacial structure under the application of orthodontic loads

2018 ◽  
Vol 53 (6) ◽  
pp. 408-420
Author(s):  
João Correia ◽  
Rui F Martins ◽  
Pedro F Santos
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Orthodontic Appliances ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Anatomical Structures ◽  
Tomographic Images ◽  
Craniofacial Structure ◽  
Reaction Forces ◽  
Aided Design

The aim of this study was to develop a three-dimensional model of a patient’s craniofacial structure to be analysed using the finite element method in order to estimate the forces required to carry out a dental positioning’s correction. The three-dimensional model was composed by several anatomical structures, namely the teeth, the periodontal ligaments, and the trabecular and cortical bones, which were modelled with the aid of computed tomography cone beam images. The tomographic images were analysed and reconstructed using the 3D Slicer software, while the assembly of the anatomical structures modelled, as well as the contact surfaces between contiguous parts, was defined in computer-aided design software. Bone remodelling and the occurrence of tissue’s injuries were considered during the numerical simulations carried out. By imposing displacements to each tooth, it was possible to calculate the orthodontic loads needed to carry out dental correction (reaction forces), as well as the distributions of stresses and deformations inherent to the clinical treatment, allowing to obtain a craniofacial structure capable of simulating the dental movements of upper and lower arches with anatomical realism. In addition, this methodology constitutes a personalised dental medicine that could lead to the development of highly customised orthodontic appliances where different mechanical loads could be applied individually to each tooth to achieve the foreseen dental correction.

SAMMTB: A Computer Aided Design Tool for Ergonomists

1986 ◽  
Vol 30 (7) ◽  
pp. 694-698 ◽  
Author(s):  
Keith Case ◽  
J. Mark Porter ◽  
Maurice C. Bonney
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Design Tool ◽  
Three Dimensions ◽  
Design System ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Computer Aided ◽  
Aided Design ◽  
Machine Interaction

Sammie (System for Aiding Man-Machine Interaction Evaluation) is a Computer Aided Design system which provides facilities for ergonomics/human factors evaluation at the earliest stage in the design process. Workplaces, for example the interior of a vehicle or a supermarket checkout, are modelled in three dimensions and presented on a computer graphics screen. A range of techniques are available for interactively modifying the design and for an ergonomie evaluation at each stage by the use of a three-dimensional model of the human operator. This paper describes the facilities available and illustrates the system's usefulness by reference to examples taken from recent design assignments.

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