Csaba CSEH Engine Connecting Rod Analysis Including Bolts Influence DW, ITE, 2008, 75 pp, 88 fig. The aim of my diploma work is a stress analysis in the material of a connecting rod during a stationary engine regime. Dynamic forces from the connecting rod‘s motion and the forces acting on the bolts are included in the calculations. The whole stress analysis is based on a FEM designed application on a model, that was created in a CAD system package according to the real component.

This diploma thesis applies to the light-weight itself of a connecting rod of a mass-produced tractor-engine. As a one of the most important and first part of this task is creating a 3D simulation model of a connecting rod. The strenght calculation is following skip factor of the light-weight, the exact calculated dimension of relieve is providing by means of an engine imbalance including the connecting rod. The outcome data of research are instrumental to the new relieve and strengthen 3D design. The conclusion and ending point of the diploma thesis evaluate results.

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No. of bitstreams: 1 alves_ac_dr_bauru.pdf: 6457883 bytes, checksum: 7bb4227bf9bba34a86a0d94c081dd5b8 (MD5) Previous issue date: 2017-09-28 / Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná (FAADCT/PR) / A aproximação ideal e linear de modelos matemáticos apesar de ser a mais utilizada pela simplicidade não se torna a única forma de representação dos problemas e soluções na engenharia quando se aplicam técnicas computacionais e cálculos numéricos. Nesse sentido, para o controle das respostas dos sistemas dinâmicos a análise das fontes não ideais como solução viável de engenharia tem sido pesquisada em várias áreas. Nessa tese estuda-se a modelagem da equação do movimento de um veículo de pequeno porte para o transporte urbano em pequenos percursos, por meio de motores híbridos biomecânico e a ar comprimido com comportamentos não lineares e não ideais, se excitando e recebendo excitação do movimento e da interação entre as fontes motoras. Esse tipo de dinâmica veicular híbrida tem sido investigada por possibilitar melhorias no rendimento energético de veículos, tornando-se essa uma técnica que minimiza o consumo de combustíveis fósseis. Dessa forma a energia elétrica se mostra uma das principais fontes motora híbrida, combinando-se a fonte elétrica a veículos de grande e médio porte com os motores de combustão, incluindo-se os veículos de pequeno porte tal como a bicicleta combinado à fonte biomecânica. Nesse contexto de utilização de energia limpa e renovável a aplicação de motores a ar comprimido possibilita características adequadas ao uso em pequenos veículos automotores, tais como, bicicleta e motocicletas. Nesse trabalho se pesquisa a aplicação de modelo não linear com motores biomecânico e a ar comprimido como fontes não ideais para o controle pelo método SDRE (State Dependent Riccati Equation) aplicado ao movimento de uma bicicleta híbrida. O controle SDRE subótimo realimentado proposto para o veículo bicicleta de pequeno porte híbrida tem como objetivo o controle ativo da velocidade a 20 km/h pelas fontes de energia não ideais, biomecânica e a ar comprimido. Esse controle ativo SDRE a 20 km/h do veículo bicicleta com motores híbridos não ideais, biomecânico e a ar comprimido, através das simulações numéricas do modelo proporcionou erro máximo de 1,2 %, tanto para o plano como em subidas até 10º. Sendo que o veículo bicicleta de pequeno porte no plano usando motor a ar comprimido de 165 W e motor biomecânico de 100 W com frequência máxima do ciclista a 55 rpm atinge a velocidade de 20 km/h com o controle e sem o controle híbrido com o motor biomecânico chega-se a 17,7 km/h. Esse controle SDRE ativo proposto se mostrou viável para o controle da velocidade, desde que os ganhos variem em função da inclinação do piso e de rampa de entrada do motor a ar comprimido a 80% da velocidade desejada, para não saturar o sinal físico. Esse sistema veicular híbrido bicicleta com fontes não ideais por motores biomecânico e ar comprimido, controlados ativamente pela velocidade proporcionou interações entre as fontes não ideais adequadas ao controle ativo pelo motor a ar comprimido. Portanto, o controle SDRE para a bicicleta em planos e subidas se mostra adequada para pequenos deslocamentos, usando-se energias limpas e renováveis no transporte urbano sustentável e não poluente. / The ideal and linear approximation of mathematical models despite being the most used for simplicity does not become the only way to represent problems and solutions in engineering when applying computational techniques and numerical calculations. In this sense, for the control of the responses of the dynamic systems, the analysis of non-ideal sources as a viable engineering solution has been researched in several areas. In this thesis we study the modeling of the equation of the movement of a small vehicle for the urban transport in small routes, by means of biomechanical hybrid motors and to compressed air with non-ideal and non-linear behaviors, getting excited and receiving excitation of the movement and the interaction between motor sources. This type of hybrid vehicular dynamics has been investigated by enabling improvements in the energy efficiency of vehicles, making this a technique that minimizes the consumption of fossil fuels. In this way electric power is one of the main sources of hybrid power, combining the electric source to large and medium-sized vehicles with combustion engines, including small vehicles such as the bicycle combined with the biomechanical source. In this context of use of clean and renewable energy the application of compressed air motors allows characteristics suitable for use in small motor vehicles, such as bicycles and motorcycles. In this work, the application of nonlinear model with biomechanical motors and compressed air as sources not ideal for the control by the State Dependent Riccati Equation (SDRE) method applied to the movement of a hybrid bicycle is investigated. The proposed sub-optimized SDRE control for the hybrid small-bike vehicle aims to actively control the speed at 20 km / h by nonideal energy sources, biomechanics and compressed air. This active control SDRE at 20 km / h of the bicycle vehicle with non-ideal hybrids, biomechanical and compressed air, through the numerical simulations of the model provided a maximum error of 1.2% for both the plane and ascent up to 10º. Being that the vehicle small bicycle in the plane using 165 W compressed air motor and 100 W biomechanical motor with maximum frequency of the rider at 55 rpm reaches the speed of 20 km / h with the control and without the hybrid control with the biomechanical engine reaches 17.7 km / h. This proposed active SDRE control proved to be feasible for speed control, provided that the gains vary as a function of the slope of the floor and of the motor input ramp to compressed air at 80% of the desired speed, so as not to saturate the physical signal. This bicycle hybrid vehicle system with non-ideal sources for biomechanical and compressed air motors actively controlled by speed provided interactions between non-ideal sources suitable for active control by the compressed air motor. Therefore, the SDRE control for the bicycle in planes and climbs is suitable for small displacements, using clean and renewable energy in sustainable and non-polluting urban transport. / Termo de Colaboração 015/2016 - UTFPR - Fundação Araucária

The subject of submitted diploma thesis is complete structure of procedures necessary for the designing and subsequent production of forging dies for production of semi-finished connecting rods. The initial part deals with the design of forging die. Following part is consisted of materials used for production of this type of tools. Ensuing is proposal of tooling for machining of the die following with simulation of the milling processes.

The aim of this diploma thesis is to propose a drive train of a seven-cylinder radial engine, including strength analysis of selected components. The basic parameters of the engine cylinder are based on the Škoda 1.2 HTP 12V 47kW AZQ engine.

This master thesis describes the design and optimization of connecting rod motor racing car. At the beginning of the whole work is a 3D-model of rods, from which then the whole work is based. Then it analyzes the current model of stress and on the basis of the results are made structural changes to the solution of rods. Newly adapted connecting rod is again analyzed using FEM and newly obtained results are compared with results of the original model of connecting rods. The conclusion deals with sensitivity analysis of selected parameters of rods and their potential effect on the resulting changes in strength connecting rod .Then is an assessment of all results.

This Diploma thesis deals with a design of a powertrain of fice-cylinder gasoline radial engine with assigned main parameters (bore, stroke, etc.). The work is divided into several parts: kinematics of the radial engine, creation of 3D models, force acting on the connecting rods, balancing of the engine. The last part is focused on creating MKP models, stress analysis and determining of fatigue safety of the selected parts.

The main aim of this master’s thesis is balancing of the inertia forces of sliding parts of the twin cylinder motorcycle’s engine by dummy connecting rod. There is description of two computing stances to design dummy connecting rod. Then there is comparison of these computing stances. The dummy connecting rod is designed and the strength analysis is done by FEM method (finite element method) to limit the state of material fatigue. Furthermore, a crankshaft is designed while considering rotation parts’ inertia forces balancing. Finally, a strength analysis by FEM method is done to limit state of material fatigue of the crankshaft

La tête de bielle n'est pas un solide mono-corps mais un solide multi-corps. Le serrage non-adapté des vis d'assemblage et les discontinuités des solides peuvent produire des phénomènes indésirables comme le glissement du coussinet dans son logement. Malgré des logiciels de calculs performants permettant de prédire le comportement des paliers il existe encore de nombreuses avaries notamment liées aux contacts entre le coussinet et son logement. La difficulté de la modélisation du contact coussinet/logement réside principalement dans l'interaction entre les différents solides et les conditions de fonctionnement. Cette étude propose une solution pour analyser ce problème par couplage entre un logiciel de calcul élatohydrodynamique (ACCEL) et un logiciel permettant le calcul du contact avec frottement entre les coussinets et le corps de bielle (ABAQUS). Après une étude bibliographique des études antérieures dédiées à la modélisation numérique et expérimentale des paliers de tête de bielle, la première partie est dédiée à une description des modèles numériques utilisés pour prédire le comportement élastohydrodynamique de paliers lubrifiés ainsi que les techniques employées pour étudier le contact sec avec frottement en mécanique. La deuxième partie présente la solution adoptée pour réaliser le couplage entre le logiciel ACCEL et le logiciel ABAQUS. Le modèle a été premièrement validée dans le cas d'un palier soumis une charge tournante. Par la suite, plusieurs calculs paramétriques, réalisés sur un cas type de palier de tête de bielle, nous ont permis de montrer l'influence des conditions de fonctionnement (diagramme de charge, vitesse de rotation, etc.) ainsi que d'autres caractéristiques de la bielle (coefficient de frottement, épaisseur du coussinet, etc) sur le comportement du palier et plus précisément sur le glissement relatif entre les coussinets et le corps de bielle. / The connecting rod is not a single body but a multi-body solid. A non-appropriate screw tightening, coupled with the solid discontinuities, can lead to undesirable phenomena such as the rotation of the shell in its housing. Despite modern numerical tools, capable to predict the bearing EHD behaviour, there are still many damages related to cumulative microslip between the bearing shell and the conrod body. The difficulty of modelling the shell/conrod contact is mainly due to the interaction between the solids and the operating conditions. This study presents a solution to analyse this problem, by coupling an elastohydrodynamic (EHD) software (ACCEL) with a commercial software (ABAQUS) able to predict the frictional contact between the shell and the conrod. After a literature review of previous studies dedicated to the numerical and experimental modelling of connecting rod bearings, the first part is dedicated to a description of the numerical models used to predict the EHD behaviour of lubricated bearings. Follows the presentation of the techniques used to study the dry frictional contact mechanics. The next part presents the adopted solution used to couple the two software. The model was first validated in the case of a bearing submitted to a rotating load. Subsequently, several parametric calculations are presented. We were able to show the influence of the operating conditions (load diagram, velocity,...) as well as other characteristics of the conrod (friction coefficient, thickness of the shell, etc.) on the performances of the bearing and more exactly on the microslip between the shells and the conrod body.

This thesis deals with the design of a spark-ignition internal combustion engine with extended expansion. It explains the principle of extended expansion using the Atkinson or Miller cycle and the possibilities of achieving it. In addition, a design study and engine cycle is carried out. Subsequently, the course of the kinematic quantities and forces in the mechanism is determined. At the end, the strength analysis of the connecting rod of the designed mechanism is performed.