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COB19 DESIGN OF A FEEDING SYSTEM FOR AN AUTOMATIC SAWING MACHINE TO CUT ALUMINIUM PROFILES
Victor Martins Saraiva
Universidade do Minho, Escola de Engenharia, Departamento de Engenharia Mecânica
Campus de Azurém, 4810 Guimarães, Portugal – E-mail: vmsaraiv@eng.uminho.pt
The author presents an alternative design solution for an automatic feeding/handling system for a sawing machine to cut aluminium profiles. The major problems arose from the need to handle profiles of widely differing shape, and also from the need of compatibility with the rest of the machine, previously designed, mainly concerning space availability. The Total Design approach has been used to carry out this project. The final design proposal is a combination of pneumatic, electric and electronic systems and components, essentially consisting of a pneumatic gripper driven by a servo-motor.
Keywords: Sawing Machine, Aluminium Profiles, Design Process.
COB86 ESTIMATIVA DE CUSTOS DE PRODUTOS NO PROJETO CONCEITUAL - METODOLOGIA PARA SELEÇÃO DA ESTRUTURA FUNCIONAL E ALTERNATIVA DE CONCEPÇÃO / ESTIMATE OF COSTS PRODUCTS IN THE CONCEPTUAL DESIGN - METODOLOGY FOR SELECTION OF THE FUNCTIONAL STRUCTURE AND ALTERNATIVE OF CONCEPTION
Cristiano V. Ferreira, Fernando A. Forcellini & Nelson Back
Departamento de Engenharia Mecânica - Universidade Federal de Santa Catarina - UFSC
Caixa Postal 476 - CEP 88000-000 - Florianópolis - SC - E-mail: cristian@grante.ufsc.br
In the conceptual design of a product must be a constant worry about the decision taking effect over the product’s costs during its life cycle stages. The selection stages of the best product functional structure and the more adequate alternative solution of the conceptual design are fundamental for its success (AKAO, 1990). In the work, it will be presented an estimating model of products’ costs, which aims to provide subsidies for decision taking and make possible the selection of a functional structure and a product alternative solution, more adequate to the target cost.
Keywords: Cost, Estimative, Methodology, Product, Design, Custo, Estimativa, Metodologia, Produto, Projeto
COB165 ANÁLISE, SIMULAÇÃO E PROJETO DE UM MECANISMO SEPARADOR DE GRANULADOS BIFÁSICOS POR VIBRAÇÃO /ANALYSIS, SIMULATION AND PROJECT OF A GRAINY SEPARATOR MECHANISM
Adyles Arato Júnior, Cassiano Bíscaro Pereira,
Departamento de Engenharia Mecânica, Faculdade de Engenharia - UNESP/FEIS
CEP 15385-000 Ilha Solteira(SP), Brasil - E-mail: adyles@dem.feis.unesp.br
Grains transport by forced mechanic vibration in vibrating courses or pools is often used in agro-industries, mining and feeding companies. The design of a two-phase grain sharer by mechanical vibrations was stimulated by the necessity of some recycling companies. Using a mathematical model of the process a simulation code of a two-phase grain sharer pool has been developed. In a preliminary analysis the most important variable involved in the process has been detected, followed by a proposition of a mechanical model to satisfy the system’ dynamics. With the help of the mechanical model, the accelerating condition in the vibration surface could be obtained, just by simulating the grain sharer process, and employing the optimal aspect ratio for a grain sharer pool design.
Keywords: Granulados, Separação de granulados, Vibrações, Projeto, Análise, Simulação
Grainy, Grainy separation, Vibration, Project, Analysis, Simulation
COB197 MODELAGEM E DIMENSIONAMENTO DE UMA MÁQUINA COLHEDORA DE CAFÉ POR SUCÇÃO AERODINÂMICA / physical-mathematical model elaboration and project process of a coffee harvester machine by by aerodynamic suction
Fernando Silva de Araújo Porto (1), José Antonio Perrella Balestieri (2), Nazem Nascimento (2) & Mauro Massayoshi Kimura (3)
The high costs involved by commercialisation and operation of harvester machines currently used at coffee cultivation, the possibility of tree damages by their continuous use, and the agricultural mechanisation necessity becomes interesting the development of a simple and portable coffee (Coffea arabica L., Coffea canephora Pierre) harvester machine. This equipment should be not only able to do the fruit's crop in a shortest time than manual harvest system, but capable to operate between the coffee trees lines independently of lines space and kind of ground too. Without special exigencies of specific earthwork or appropriate line distance, the machine implementation cost should be only the acquisition price. This present work explain the problem physical-mathematical model elaboration and prototype project process.
Keywords: Agricultural machines, Coffee, Coffee cultivation, Harvest machine, Coffee harvest machine, Máquinas agrícolas, Café, Cultivo de café, Colheita, Colhedora.
COB218EVOLUÇÃO TECNOLÓGICA NO DIMENSIONAMENTO DA TERCEIRA UNIDADE GERADORA PARA A UHE COARACY NUNES
José Adalberto Lage Calainho, Carmo Gonçalves, Cid Antunes Horta e Wandyr Ferreira
ELETRONORTE – Gerência de Projeto Eletromecânico Hidrelétricas – Tel: (061) 212-5753
SCN-Q. 06-Conj. A- Bl. B, Sala 506 – Brasília-DF – CEP 70710-000 – Fax: (061) 212-5355
This work has the finality to show the project’s philosophies, technologic advances, dimension’s calculation methods and the results obtained from an International bid for COARACY NUNES Hydropower Station, third generation unit (Kaplan Turbine with vertical shaft and 30 MW) and comparing its obtained results with the two operating units, installed in 1975 (Kaplan Turbine with vertical shaft, and 20MW per unit).
Keywords: Turbina Kaplan , Coaracy Nunes , Evolução Tecnológica , Estado da Arte , Filosofia de Projeto.
COB219 FILOSOFIA DE PROJETO E AVANÇO TECNOLÓGICO NO DIMENSIONAMENTO DOS EQUIPAMENTOS ELETROMECÂNICOS PARA A EXPANSÃO DA UHE TUCURUÍ
Mário Dias Miranda, José Adalberto Lage Calainho, Carmo Gonçalves e Wandyr Ferreira
ELETRONORTE - Superintendente de Expansão da Geração – Tel: (061) 212-6042 / 212-5753
SCN-Q. 06-Conj. A- Bl. B, Sala 506 – Brasília-DF – CEP 70710-000 – Fax: (061) 321-3958
This work has the finality to show the project’s philosophy, calculation methods and the achieved results on the disign of TUCURUI Hydropower Station, second stage construction, composed by 11 (eleven) generation units (Francis Turbine with vertical shaft 382 MW per unit and Generator with 395 MVA per unit) and also to show the technologic advances obtained comparing its results with the 12 (twelve) units (Francis Turbine with vertical shaft a 320 MW per unit, and Generator with 350 MVA per unit), operating since 1984 and the cost reduction due to the use of some equipments installed in the first stage construction as: overhead travelling crane, travelling crane, trashrack machine, etc.
Keywords: Turbina Francis, Tucuruí, Evolução Tecnológica, Estado da Arte - Projeto.
COB222 AVALIAÇÃO DOS PARÂMETROS ENVOLVIDOS NO DESENVOLVIMENTO DE UMA MÁQUINA COLHEDORA DE CAFÉ POR SUCÇÃO AERODINÂMICA / parameter’s evaluation of a coffee harvester machine by aerodynamic suction
Fernando Silva de Araújo Porto (1), José Antonio Perrella Balestieri (2), Nazem Nascimento (2) & Mauro Massayoshi Kimura (3)
The present work has like main objective the necessary parameter's evaluation to development of simple and portable coffee (Coffea arabica L., Coffea canephora Pierre) harvester machine by aerodynamic suction. The parameter's evaluation was done by means of the physical-mathematical model elaboration, prototype design and assembly, which was field tested at coffee harvest time. The results showed the coffee grains need flow velocity near 270 m/s for efficient suction, and the leafs are injured close by 60 m/s flow velocity band. These results permit the follow conclusions: a) the main objective, the harvest machine project parameters identification and quantification, was successfully performed; b) the proposed physical-mathematical model was appropriated, anticipating the velocity flow value necessary for efficient coffee grain suction; c) the methodology used at this study can be adopted in others harvest machines project development process, with distinct target objectives, like different fruits, fibres (such as Chorisia speciosa fibres), leafs, or flowers with commercial value.
Keywords: Agricultural machines, Coffee, Coffee cultivation, Harvest machine, Coffee harvest machine, Máquinas agrícolas, Café, Cultivo de café, Colheita, Colhedora.
COB223 PROJETO DE CONJUGAÇÃO DE OPERAÇÕES PARA IMPLEMENTO AGRÍCOLA / DESIGN OF COMBINING EQUIPAMENT FOR AGRICULTURAL OPERATION
João Eduardo Guarnetti dos Santos, Abilio Garcia dos Santos Filho, João Candido Fernandes & Marcos Roberto Bormio
Departamento de Engenharia Mecânica, Faculdade de Engenharia e Tecnologia - UNESP - Bauru
CEP 17033 - 360 Bauru, Brasil - E-mail: guarneti@bauru.unesp.br
According to the ASAE (1982), the combined tillage operations are those realized simultaneosly utilizing two or more different types of tillage tools or implements to simplify, to control or to reduce the number of pass over a field. These systems have not been the study purpose having a small quantify of researchs about this subject in Brazil. By this evidence, was developed this research to study the influences of an combining equipament over several parameters and design.
Keyword: Combined tillage, design, agricultural equipament
COB349 MANCAIS AEROSTÁTICOS PARA EIXOS - ÁRVORES DE MÁQUINAS FERRAMENTAS
Benedito de Moraes Purquerio1, Luiz Antonio Pinheiro Balestrero2
1 Universidade de São Paulo - Escola de Engenharia de São Carlos
Caixa Postal 359 - Av. Dr. Carlos Botelho, 1465, 13560-250 - São Carlos/SP, (016) 274-3444 r.3444, purquerio@sc.usp.br
2 Departamento de Engenharia Mecânica - EESC - USP
Caixa Postal 359 - Av. Dr. Carlos Botelho, 1465, 13560-250 - São Carlos/SP, (016) 2743444
The main characteristics and design methods for machine tool spindles aerostatic journal bearings with orifice restrictors are presented. The load capacity and stiffness of front bearing and spindle nose characteristics obtained in a sensored test rig as functions of the supply pressure, spindle overhang and the distance between bearings are analysed and compared with the literature.
Keywords: Aerostatic bearings, machine tool, spindles, journal bearing, orifice restrictor, stiffness, test rig, spindle nose.
COB451 DETERMINAÇÃO TEÓRICO-EXPERIMENTAL DE ESFORÇOS DINÂMICOS EM BOMBAS INJETORA DISTRIBUIDORA DIESEL / THEORETICAL AND EXPERIMENTAL ANALYSIS OF DYNAMIC STRAINS IN DIESEL FUEL INJECTION PUMPS
I. F. Santos & A. Teixeira Neto
Dep. de Projeto Mecânico, Fac. de Engenharia Mecânica - UNICAMP
CEP 13083-970 Campinas, Brasil - E-mail: ilmar@dpm.fem.unicamp.br
In this work the driving shaft of an injection pump is modeled as a flexible rotor using the Finite Element Method. Strains acting on the shaft due to each one of the mechanisms that are coupled to it (driving gear, hydrodynamic bearings, vane type pump, regulator gear and cam) are extensively studied so that the mathematical model faithfully reproduces the dynamic loadings of the injection pump. Theoretical and experimental analysis are conducted in three distinct operating conditions: injection pump operating at 2600 rpm, 2000 rpm, and 1500 rpm. The driving torque and the loading of hydrodynamic bearings, obtained by means of experimental mechanical tests, are used as parameters for comparisons.
Keywords: método dos elementos finitos, diferenças finitas, rotores - dinâmica, modelos matemáticos. finite element method, finite difference method, dynamics, mathematical modelling.
COB456 DESIGN OF A RECOVERY SYSTEM FOR SMALL ORBITAL PAYLOADS
Victor Koldaev, Edmar de Queiroz Figueredo & Paulo Moraes Jr.
Divisão de Sistemas Espaciais, Instituto de Aeronáutica e Espaço/Centro Técnico Aeroespacial
12228-904 São José dos Campos-SP, Brasil
Small returnable orbital payloads or spacecrafts needs safe, efficient and affordable recovery systems. Systems based on parachutes are the most reliable choice, due to its proven reliability and low cost. The present work deals with the preliminary design features of a high performance ground recovery system for small orbital payloads based on parachutes. The proposed system comprises a three stage parachute system with an air-bag as ground impact attenuator. The paper shows and discusses the specification, concept and design of the system.
Keywords: recovery system, orbital payloads, returnable spacecraft, parachute, impact attenuator
sistema de recuperação, carga-útil orbital, satélite retornável, pára-quedas, atenuador de impacto
COB471 Uma Ferramenta Computacional para Utilização do QFD no Desenvolvimento de Produtos / A software to APPLY qfd in product design
Cristiano Machado & Franco G. Dedini
Departamento de Engenharia Mecânica, Faculdade de Engenharia Mecânica - Unicamp
CEP 13083-970 Campinas, Brasil - E-mail: juca@fem.unicamp.br
QFD as a whole can be described as a systematic process which translate the consumers needs into the language necessary to develop goods. This paper presents a computational program developed to execute the task necessaries to complete one of the first matrix of QFD, it is called "The House of Quality Matrix". It was implemented under a visual objected oriented language (Visual Basic), and it has a modular structure, that means this system can be used by other softwares. The program is a prototype and the necessary tests to validate it has not been executed yet. This computer program has a educational characteristic, so, it can be used as a tool in courses related to mechanical design, quality, and correlated fields, nevertheless it is useful in industries and commercial environment when it is necessary to training people in QFD.
Keywords: Quality, Consumer Needs, House of Quality, Quality Software / Qualidade, Requisitos do Consumidor, Casa da Qualidade, Ferramentas Computacionais para Qualidade
COB472 Metodologia de Análise de Vida em uma Transmissão Continuamente Variável para Bicicletas / Methodology of lifetime analysis for a Continuously Variable Transmission of Bicycles
Antonio Wagner Forti & Franco Giuseppe Dedini
Departamento de Projeto Mecânico, Faculdade de Engenharia Mecânica - UNICAMP
Caixa Postal 6051 - CEP 13083-970 - E-mail: awforti@fem.unicamp.br, dedini@dpm.fem.unicamp.br
The traction drives continuously variable transmission operate in the high-contact-stress. The achievement of a given number of stress repetitions without failures can only be assigned a probability. Most drives are rated against the 90% probability of surviving the number of stress repetitions associated with the rated number of hours of operation at the rated speed and load. A contact fatigue life analysis for traction drives based on a modified Lundberg-Palmgren fatigue theory and numerical simulations of the Man+Continuosly Variable Transmission+Bicycle system for three different types of route and two value of power are used to predict the life of this transmission on a bicycle
Keywords: Bicicleta, Transmissões, CVT, Fadiga, Teoria de contato/Bicycle, Transmission, CVT, Fatigue life, Stress analysis.
COB482 INFLUÊNCIA DA GEOMETRIA DOS SELOS DE FLUXO PLANOS NAS PERDAS POR ATRITO E NO SALTO DE PRESSÃO AXIAL / influence of Plain seal’s geometry in friction loss and axial drop pressure
Fabricio Cesar Oda, Katia Lucchesi Cavalca
Depto de Projeto Mecânico - FEM - UNICAMP - Campinas
Caixa Postal 6051 CEP 13083-970 Campinas-SP, Brasil E-mail : katia@dpm.fem.unicamp.br
The main objective of this work is the development of a Software (Visual Basic 3.0) to analyse the influence of the seal geometry in its friction loss : volumetric flow and pressure drop across the seal. The Software is based on the evaluation of the friction factor, which is calculated using an expression corresponding to the Moody Diagram. The Software results are the seal length, pressure drop, volumetric flow and the data to build diagrams that makes clear the influence of seal geometry in friction loss. These diagrams show the variation of pressure drop and volumetric flow with the seal length and with the seal clearance. So, it is possible to obtain data that can guide the choose of a better geometry corresponding with the situation the user wishes. For example, a geometry that minimize the friction loss.
Keywords: Selos de fluxo, salto de pressão, vazão volumétrica, fator de atrito / Plain seals, drop pressure, volumetric flow, friction factor
COB 627 Análise dos recipientes compostos seccionados e inteiriços usados para a geração de alta pressão / Analyse of segmenteds and entires compounds vessels used to obtain The high pressure
Alan Monteiro Ramalho, Guerold Sergeevitch Bobrovnitchii & Sérgio Neves Monteiro
Laboratório de Ciência de Materiais Avançados da Universidade Estadual do Norte Fluminense, LAMAV - UENF, CEP 28.015-620 Campos dos Goytacazes, Brasil - E-mail: alan@uenf.br.
In scientific and technological work two kinds of apparatus are normally used to obtain high pressure up to 7 GPa: cylindrical pistons or conic pistons. These setup allows pressures much higher than the limited rupture of materials which piece are made of. This is possible due to application of a special device called compound vessel. The present work analyses the construction, under normal working pressure, the junction between sector are kept closed and the junction surfaces have normal stress close to zero. The obtained correlation permits the determination, after fabrication and under loading, of stress and strain states of internal sector of the segmented rings compound vessel. It was necessary to design a special profile for the side surface of the sectors to obtain this proposed condition.
Keywords: Alta Pressão, Recipiente Composto / High Pressure, Compound Vessel.
COB640 ENGENHARIA CONCORRENTE: PERSPECTIVAS PARA O SETOR ESPACIAL/ CONCURRENT ENGINEERING: PERSPECTIVES FOR THE BRAZILIAN SPACE SECTOR
Flávio de Azevedo Corrêa Jr1, Luis Gonzaga Trabasso2 & Isak Kruglianskas3
1Instituto de Aeronáutica e Espaço, Centro Técnico Aerospacial, São José dos Campos - SP, e-mail: flavio@ase2.iae.cta.br
2Instituto Tecnológico de Aeronáutica, Centro Técnico Aerospacial, São José dos Campos - SP, e-mail: gonzaga@mec.ita.cta.br
3FEA /PACTo, Universidade de São Paulo, São Paulo - SP, e-mail: ikruglia@usp.br
The development cycle of a satellite launch vehicle is a task that requires considerable maturity and commitment of the design team. The increasing complexity of the tasks involved and the frequent design changes do create the need for attempts to reduce the development cycle period as well as to implement their rational management. Although one may consider the aerospace industry as a highly developed one, it keeps its structure in a sequential manner, where the events quite often do not relate to each other, thus preventing the aerospace industry to benefit from effort and rework minimisation. This paper presents a retrospective analysis of the management and design tools recently used in the Brazilian aerospace projects and suggests the utilisation of some concurrent engineering tools which could enhance the performance and productivity of future projects.
Keywords: Concurrent engineering, Project management, Design teams, Design tools, Engenharia Simultânea.
COB 641 AN ORGANISATIONAL FRAMEWORK FOR DEVELOPING HIGH TECHNOLOGY PRODUCTS -EXPERIENCES OF A BRAZILIAN AERONAUTICAL COMPANY
Antonio da Cunha Campello, Luís Gonzaga Trabasso
EMBRAER – Departamento Técnico - Av. Brigadeiro Faria Lima, 2170 – São José dos Campos – SP – Brasil -
CEP 12227-901
Divisão de Engenharia Mecânica Aeronáutica – Instituto Tecnológico de Aeronáutica – ITA – Praça Marechal do Ar Eduardo Gomes, 50 – São José dos Campos – SP – Brasil – CEP 1228-904
This paper relates the Integrated Product Development (IPD) approach with the need of having an improved organisational framework and proposes an integrated management approach to companies which develop complex products. It describes the degree of complexity for developing an aircraft, emphasising the market demand to decrease the development cycle time and operational costs as well as to increase the customer satisfaction and the embedded product quality. The effectiveness of a design that involves complex technologies is highly affected by the project and process management approach. This paper describes some experiences of a Brazilian Aeronautical company, revealing the main pitfalls to move from a functional to a matrix organisation, envisioning a team-based working philosophy. It also describes the required evolution of the product development process to cope with market needs. It concludes the analysis proposing a management framework that balance the organisational aspects with the modern product development process.
Keywords: Integrated Product Development/Desenvolvimento Integrado do Produto, Concurrent Engineering/Engenharia Simultânea, Aircraft Design Process/Processo para Projetar Aeronaves, Design Management/Gerenciamento de Projeto
COB672 THE DESIGN OF A STABILIZED GONDOLA FOR A GAMMA RAY TELESCOPE - PROJECT MASCO
Petrônio Noronha de Souza, Raphael de Almeida Fonseca, Thyrso Villela Neto, Mário Kataoka Filho
Instituto Nacional de Pesquisas Espaciais - INPE
Caixa Postal 515, 12227-010, São José dos Campos, SP, Brasil - E-mail: petros@dem.inpe.br
This paper describes the mechanical structure and the attitude control system of the gondola that carries the MASCO experiment. This is a gamma ray telescope that flies suspended by a balloon at an altitude of 40 km. The gondola is a truss structure that shall survive the landing loads and fulfil several requirements concerned with the mechanical interfaces and constraints of the transportation, launching and recovery. An attitude control system has the objective of pointing and stabilizing the telescope moving the gondola in azimuth and the telescope in elevation. There are several targets to be observed during the flight and the telescope must hold the attitude for more than one hour towards each one. Several types of sensors and actuators are employed. The system is computer controlled and the control software comprises several modes of operation according to the phase of the mission and the angular distance from the target.
Keywords: Balloon-borne experiment, Gamma ray telescope, Structural design, Attitude control system
Balão estratosférico, Telescópio, Raios Gama, Projeto estrutural, Sistema de controle da atitude
COB952 ESTUDO DA CONFIABILIDADE NO PROCESSO DE PROJETO RELIABILITY STUDY IN DESIGN PROCESS
Julio Cézar de Almeida & Acires Dias
Centro Federal de Educação Tecnológica do Paraná - CEFET-PR / Depto de Engenharia Mecânica, Universidade Federal de Santa Catarina - UFSC e-mail - acires@emc.ufsc.br
An engineering design consists of comprehensible design requirements and it should outline possible solutions, assess them and select the best alternative. Today’s designer must be skilled and have a vast knowledge and a command of all external and internal influences around him and must always aim at achieving an efficient and competitive product at a low cost. The use, however, of one of the several well-known methodologies such as: Asimov; Pahl&Beitz; VDI 2221; among others, facilitates the designer’s job. On the other hand, is it worth having an efficient and competitive product that is not available at one specific moment of its lifespan? The temporal quality or life of a certain system is directly related to its availability, which is a direct function of the reliability and maintainability; aspects normally raised in specific areas such as in the nuclear, aeronautics and electronics areas. An assessment of the different design approaches raised show, however, that neither of these models focuses clearly on the specific use of the reliability in the several design stages, which proves the need of a deeper study of such aspect in the design process.
Keywords: Confiabilidade, Disponibilidade, Processo de Projeto / Reliability, Availability, Design Process.
COB1002 PROJETO CONCEITUAL DE UM REATOR PILOTO PARA PROCESSAMENTO DE MATERIAIS METÁLICOS POR PLASMA / CONCEPTUAL DESIGN OF A PILOT REACTOR FOR METALLIC MATERIALS PLASMA PROCESSING
Luciano Antonio Mendes, Vilson João Batista, Joel Louis Rene Muzart, Aloísio Nelmo Klein & Nelson Back
Departamento de Engenharia Mecânica, UFSC - CEP 88040-900, Florianópolis, SC, Brasil
E-mail’s: lmendes@grante.ufsc.br; batista@labmat.ufsc.br; joel@labmat.ufsc.br; klein@labmat.ufsc.br; back@emc.ufsc.br
This paper presents the development of the conceptual design of a pilot reactor for metallic materials plasma processing. The users and design requirements of the reactor were established based on the results obtained from researches developed at the Materials Laboratory / Plasma Division / UFSC, with emphasis on plasma sintering of metallic materials. To these informations were applied organization and classification methodologies, such as the quality function deployment QFD, to define and establish the order of priorities of design specifications. Based on these specifications and using a functional analysis method, a functional model was developed, containing the following main partial functions: vacuum generation; energy supply; gas mixture supply; process containment; structural function; process control. This functional model promotes an electrical discharge environment in abnormal regime having the processing components as the cathode, in wich a set of parameters, such as pressure, temperature, gas flows, voltage and current are controlled during the process cycle, in order to reproduce the route that ensures the desired properties in the final product. From the functional model was built a morphological chart to generate alternative conceptions and these conceptions were submitted to a selection procedure to define the most suitable conceptual solution for the reactor.
Keywords: Projeto de reator; Plasma; Sinterização; Metodologia de projeto / Reactor design; Plasma; Sintering; Design methodology
COB1313 GARRA MECÂNICA FLEXÍVEL PARA MANIPULAÇÃO DE OBJETOS COM DIVERSAS GEOMETRIAS / MANIPULATION OF NA OBJECT WITH VARIOUS GEOMETRIES BY THE ELASTIC MECHANICAL HAND
Luiz Heleno Moreira Duque
Programa de Engenharia Oceânica - COPPE/UFRJ, 21945-970 - Rio de Janeiro-RJ - Brasil - E-mail: duque@feg.unesp.br
Tamotsu Hirata
Departamento de Mecânica - FEG/UNESP, 12500-000 - Guaratinguetá-SP - Brasil - E-mail: tamotsu@feg.unesp.br
This work has the proposal to make a design, to manufacture a prototype and evaluation the operational conditions of a flexible mechanical robot hand destined to grip in the "tweezers way" and to grasp object with various geometrical forms, like the correlated movements of the human hand. Some different configuration of the elastic fingers were evaluated in terms of the manipulations capabilities. An experimental and theoritical evaluations of the effector positions were were performed, respectively, by the prototype model and the large deformation beam model. It was concluded that the results of the work were successful.
Keywords: Elastic mecanical hand, manipulation capability, End effector position, Degign.
COB1320 ANALYSIS AND DESIGN OF A MACHINE FOR STEEL WIRE INDENTATION
A. A. Rojas Salgado
Departamento de Ingeniería Mecánica, Facultad de Ingeniería, UNAM
Apartado Postal 70-256, Cd Universitaria, 04510 México, D. F., México - E- mail: arojas@servidor.unam.mx
L. Hernández Anda
Centro de Asimilación Tecnológica, Facultad de Estudios Superiores Cuautitlán, UNAM, Cuautitlán Izcalli, Edo. de México, México.
The Theory of Elasticity is applied to the Mechanics of the Contact on this paper, the equations for knowing the magnitude of the forces in the indentation process are developed. The pressures, that are generated upon producing the notches, are calculated based on the mechanics of the contact and the boundary conditions as well as the properties of the material. The purpose is to apply these equations for the designing of the Indentation machine. The equations that describe the behavior of the stress in the edges of the notches of the indenter roller are used to compare the stress when its angles changes.
Keywords: Mechanics of contact, Theory of Elasticity, Elastic half-space, Indentation, Finite Element.
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