Analysis of Connecting Rod for Static Stress and Deformation for Different Materials

In the ever-evolving field of automotive engineering, the connecting rod assumes a pivotal role in the seamless transformation of reciprocating piston motion into the rotary motion that propels an engine's crankshaft. Traditionally crafted from carbon steel, recent strides in materials science have unveiled the potential of aluminium alloys as a compelling alternative. These alloys, lauded for their lightweight attributes and remarkable impact resistance, particularly excel in the demanding realm of high-speed motorcycle engines.Our investigation meticulously assesses crucial parameters including von Mises stress, Equivalent Elastic Strain and total Deformation

Four-stroke internal combustion engine crankshaft fundamentals

This thesis covers general topics concerning the forces, oscillations, manufacturing processes, and design trends of a four stroke internal combustion engine crankshaft and the prior knowledge required to obtain a precise understanding of the crankshaft working conditions and the parameters that affect said conditions. Prior to defining the different forces acting on a crankshaft, basic piston dynamics are explained to establish relations between piston movement and crankshaft rotation since piston and connecting rod masses are a large source of force on the crankshaft. Geometric relations are used to derive kinematic equations that describe piston motion. By considering an ideal Otto cycle and the piston motion equations, a relation between cylinder gas pressure and crankshaft rotation is obtained. These equations are then used to derive the inertial and gas forces acting on the crankshaft. These equations are then used to create a software tool via MATLAB that allows users to input certain engine characteristics and obtain several graphs illustrating torques, piston motion, and gas pressure. The user can change independent parameters to observe how these affect different graphs. Manufacturing processes and their advantages and disadvantages are covered, alongside the different materials, their characteristics, and applications. Finally, the iterative crankshaft design process and key design focus points and their corresponding limitations are covered.Ingeniería Mecánic

A New Mechanical Analysis of a Crankshaft-connecting Rod Dynamics Using Lagrange’s Trigonometric Identities

The main objective of this study was to conduct a new and simple but accurate analysis of the dynamics of a crankshaft-connecting rod system based on Lagrange’s trigonometric identities. Actual and equivalent connecting rod mass approximations of single- and multi-cylinder reciprocating engines were studied. Several examples were studied to demonstrate the dynamics of the system. Lagrange’s trigonometric identities were used to simplify the model, while MATLAB was used to obtain the results. For both the proposed reduced model and the full model, the resultant forces and torques of an actual and an equivalent connecting rod mass were compared. The results showed that the proposed reduced model gives force and torque results that match the results of the full model very well. It was shown that the largest torque imbalance resultant on the crankshaft was exerted by the two-cylinder engine. In addition, it was shown that the largest external forces resultant acting in the x-direction was exerted by the one-cylinder engine. The results also revealed that the resultant of external forces acting in the y-direction was zero for multi-cylinder engines. The relative error, which mainly occurred at the points of maximum force and torque, ranged from about 1% to about 15%

A New Mechanical Analysis of a Crankshaft-connecting Rod Dynamics Using Lagrange’s Trigonometric Identities

The main objective of this study was to conduct a new and simple but accurate analysis of the dynamics of a crankshaft-connecting rod system based on Lagrange’s trigonometric identities. Actual and equivalent connecting rod mass approximations of single- and multi-cylinder reciprocating engines were studied. Several examples were studied to demonstrate the dynamics of the system. Lagrange’s trigonometric identities were used to simplify the model, while MATLAB was used to obtain the results. For both the proposed reduced model and the full model, the resultant forces and torques of an actual and an equivalent connecting rod mass were compared. The results showed that the proposed reduced model gives force and torque results that match the results of the full model very well. It was shown that the largest torque imbalance resultant on the crankshaft was exerted by the two-cylinder engine. In addition, it was shown that the largest external forces resultant acting in the x-direction was exerted by the one-cylinder engine. The results also revealed that the resultant of external forces acting in the y-direction was zero for multi-cylinder engines. The relative error, which mainly occurred at the points of maximum force and torque, ranged from about 1% to about 15%

ANALYSIS OF HEAT TRANSFER RATE OF IC ENGINE CYLINDER

The main object of the present work toenhance the heat transfer rate from existingdesign of engine cylinder block by changingits design and also with new material. Forthat two cad models have been created withthe help of CATIA software and thentransient thermal analysis where performedusing ANSYS at two different ambienttemperatures for both winter and summerseasons. For the winter season the ambienttemperature 22oC is used and for summerseason 45oC for actual as well as proposeddesign of IC engine one by one to optimizegeometrical parameters and enhanced heattransfer rate. it has been observed from theresults of transient thermal analysis theproposed design of engine cylinder blockhas better performance and heat transferrate as compared to actual design of enginecylinder block

Automotive Stirling engine development program

The major accomplishments were the completion of the Basic Stirling Engine (BSE) and the Stirling Engine System (SES) designs on schedule, the approval and acceptance of those designs by NASA, and the initiation of manufacture of BSE components. The performance predictions indicate the Mod II engine design will meet or exceed the original program goals of 30% improvement in fuel economy over a conventional Internal Combustion (IC) powered vehicle, while providing acceptable emissions. This was accomplished while simultaneously reducing Mod II engine weight to a level comparable with IC engine power density, and packaging the Mod II in a 1985 Celebrity with no external sheet metal changes. The projected mileage of the Mod II Celebrity for the combined urban and highway CVS cycle is 40.9 mpg which is a 32% improvement over the IC Celebrity. If additional potential improvements are verified and incorporated in the Mod II, the mileage could increase to 42.7 mpg

3D CFD Combustion Simulation of a Four-Stroke SI Opposed Piston IC Engine

The reciprocating IC engine plays an important role in the world transport, with very few alternative configurations having commercial success. In light aircraft applications where low vibrations are crucial, boxer engines have predominated. The rising cost of fuel and the growth of public concern over pollutant emissions has led to an increased interest in alternative designs. In recent years, with the uprising of new technologies, research techniques and materials, the OP engine has emerged as a viable alternative to the conventional IC engine in some applications including in the aeronautical field. This study presents a numerical analysis of the combustion process of octane-air mixture in a four-stroke SI opposed piston engine. The model used in the simulations represents the internal volume of the cylinder of UBI/UDI-OPE-BGX286 engine. The simulation was run in Fluent 16.0 software, the species transport model was chosen to model combustion from the available in Fluent, and three different engines speeds were simulated: 2000RPM, 3200RPM and 4000RPM. Regarding the results obtained from the three CFD simulations, the overall behavior and properties of the in-cylinder flow and the obtained graphics were considered acceptable.O motor alternativo de combustão interna desempenha um papel importante no mundo dos transportes, existindo ainda poucas configurações alternativas com sucesso comercial. Relativamente a aplicações em aeronaves ligeiras, onde as baixas vibrações são de extrema importância, os motores boxer têm predominado o mercado. O aumento do custo do combustível e o aumento da preocupação do público com as emissões de poluentes levaram a um maior interesse em novas alternativas. Nos últimos anos, com o surgimento de novas tecnologias, técnicas de pesquisa e materiais, o motor de pistões opostos surgiu como uma alternativa viável ao motor convencional de combustão interna em algumas aplicações, inclusive na área aeronáutica. Este estudo apresenta uma análise numérica do processo de combustão da mistura de octano-ar num motor de faísca a quatro tempos e de pistão oposto. O modelo utilizado nas simulações representa o volume interno do cilindro do motor UBI / UDI-OPE-BGX286. A simulação foi executada no software Fluent 16.0, dos modelos disponíveis no Fluent o modelo de transporte de espécies foi escolhido para modelar a combustão, e três diferentes velocidades de motor foram simuladas: 2000RPM,3200RPM e 4000RPM. Em relação aos resultados obtidos nas três simulações CFD, o comportamento geral e as propriedades do fluxo no cilindro e os gráficos obtidos foram considerados aceitáveis

ANALYSIS AND OPTIMIZING CONNECTING ROD FOR WEIGHT AND COST REDUCTION

The objective of this work is to explore weight and cost reduction opportunities, in the design and production of connecting rod. The study has been dealt with two steps. First part of the study analysis includes the determination of loads acting on connecting rod as a function of time. This is done in order to find out the minimum stress area and to remove the material in those areas. The relationship between the load and acceleration of connecting rod for a given constant speed of the crankshaft are also determined. Finite element analysis was performed at several crank angles. The connecting rod can be designed and optimized under the loads ranging from tensile load, corresponding with 360º crank angle at the maximum engine speed as one extreme load and compressive load corresponding with the peak gas pressure as the other extreme load. Modal analysis is performed to find out the natural frequencies

A 15kWe (nominal) solar thermal electric power conversion concept definition study: Steam Rankine reheat reciprocator system

An evaluation was made of the potential of a steam Rankine reheat reciprocator engine to operate at high efficiency in a point-focusing distributed receiver solar thermal-electric power system. The scope of the study included the engine system and electric generator; not included was the solar collector/mirror or the steam generator/receiver. A parametric analysis of steam conditions was completed leading to the selection of 973 K 12.1 MPa as the steam temperature/pressure for a conceptual design. A conceptual design was completed for a two cylinder/ opposed engine operating at 1800 rpm directly coupled to a commercially available induction generator. A unique part of the expander design is the use of carbon/graphite piston rings to eliminate the need for using oil as an upper cylinder lubricant. The evaluation included a system weight estimate of 230 kg at the mirror focal point with the condenser mounted separately on the ground. The estimated cost of the overall system is $1932 or$90/kW for the maximum 26 kW output