Analysis of the Influences of Piston Crankshaft Offset on Piston Secondary Movements

Yan, Hongyuan; Jin, Yang; Zhang, Baocheng

doi:10.2174/1874155x01509010933

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…y oscilaciones), golpes y pérdidas por fricción que experimenta el émbolo en las carreras de operación dentro del ciclo termodinámico. El cálculo de este parámetro se lleva a cabo mediante la ecuación (10), donde es la carrera del pistón (Botta, Brusconi, Pokolenko y Vera de la Cruz, 2011;Hongwei, Jin y Baocheng, 2015) a = S (10) 2…”

Section: A Análisis Teórico Del Ciclo Ottounclassified

Desarrollo de una metodología para calcular los niveles de emisiones contaminantes en motores de combustión interna alternativos

Muñoz

Paredez

Triana

2018

Ciencia y Poder Aéreo

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En este artículo se presenta un procedimiento que permite calcular teórica y preliminarmente los niveles de agentes contaminantes producidos por cualquier tipo de motor de combustión interna alternativo, con el fin de reducir los costos y recursos que trae consigo una prueba experimental para el mismo propósito. El objetivo principal de este artículo es presentar el cálculo de los niveles de dióxido de carbono, óxidos de nitrógeno y material particulado con un diámetro aerodinámico de 2.5 micrómetros, a partir de los parámetros geométricos y de operación de motores de combustión interna alternativo (MCIA), los cuales son utilizados en aeronaves y vehículos terrestres. En primera instancia se presentan algunas de las investigaciones previas realizadas, las cuales se toman como punto de partida para calcular las emisiones contaminantes. Posteriormente se muestra el desarrollo llevado a cabo para encontrar la potencia de frenado, cuyo valor permite proporcionar un aporte importante al momento de hallar los niveles de contaminantes. Luego, se muestran los resultados obtenidos, los cuales son comparados con resultados de pruebas experimentales para determinar la confiabilidad de la metodología mediante un análisis ANOVA (ANalysis Of VAriance) y finalmente se presentan las respectivas conclusiones.

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Section: A Análisis Teórico Del Ciclo Ottounclassified

Desarrollo de una metodología para calcular los niveles de emisiones contaminantes en motores de combustión interna alternativos

Muñoz

Paredez

Triana

2018

Ciencia y Poder Aéreo

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Validated Analytical Modeling of Eccentricity and Dynamic Displacement in Diesel Engines with Flexible Crankshaft

2022

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In spite of the fact that the flexibility of the crankshaft of diesel engines exhibits notable nonlinearities, analytical modeling of such nonlinearities is not yet realized. The present study thus analytically models the effect of eccentricity on flexible crankshaft and piston secondary motion. The eccentricity of the crankshaft is modeled as the summation of the hydrodynamic eccentricity and the dynamic mass eccentricity of the crankshaft. The study also models the absolute value of the vibrational dynamic displacement of the center of the crankshaft. The paper proves that such dynamic displacement of the center of the crankshaft is sensitive to the changes in its independent variables. It was found that the most influential parameters on the dynamic displacement of the center of the crankshaft due to vibration are the natural frequency and the eccentricity of the crankshaft. The modeling of the dynamic displacement in a flexible crankshaft was validated using a case study based on the eccentricity of the crankshaft showing a relative error of 4%, which is less than the relative error in the CMEM and GT-Power. Furthermore, the analytical modeling of the dynamic displacement in the flexible crankshaft was validated using another case study based on fatigue analysis of the crankshaft showing a relative error of 9%, which is less than that the relative error in Newman’s model of diesel engine fuel consumption and Lansky’s model of diesel engine cylinders. The paper also presents a proposed approach of fatigue failure analysis for vehicular dynamic components and presents a proposed nanostructure of crankshafts for improving such fatigue performance. The developed models would help develop efficient diesel engines and help prolong their service life.

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Retraction: Validated analytical modelling of frequency-based aspects, eccentricity and stress concentration in diesel engines with flexible crankshaft

Elmoselhy

2018

AIMSE

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<abstract> <p>Diesel engines provide higher power but exhibit much larger in-cylinder pressure and dynamic loading on crankshaft than those of spark ignition engines. Optimizing the fuel consumption in diesel engines holds the potential to improve transport sustainability. The flexibility of the crankshaft of diesel engines exhibits significant nonlinearities in the analysis of diesel powertrains performance. Particularly, at crankshaft rotational speeds of higher than 2000 rpm the influence of the flexibility of the crankshaft of diesel engine on diesel powertrains performance becomes obvious. Analytical modelling of such dynamics of diesel engines is yet to be done. Thus, the frequency-based aspect of the analysis of flexible crankshaft has been investigated. The stiffness and natural frequency of crankshaft have been thus analytically modeled. Also, the effect of eccentricity in flexible crankshaft on crankshaft and piston secondary motion has been analyzed. The study hence analytically modeled the eccentricity of the crankshaft as the summation of the hydrodynamic eccentricity of the crankshaft and the dynamic mass eccentricity of the crankshaft. The absolute value of the dynamic displacement of the center of the crankshaft due to vibration has been therefore analytically modeled. The analytical modelling of the dynamic displacement in flexible crankshaft has been validated using a case study showing a relative error of 2.7%. Moreover, the study has proposed remedying the stress concentration in the most critical section in crankshaft by identifying: (ⅰ) the location of the most critical section of stress concentration in crankshaft, (ⅱ) the effect of the radius of the crankpin shoulder fillet on the maximum shearing stress that can carried by the crankpin. Thus, the present paper has identified the value of the radius of the crankpin shoulder fillet that remedies the stress concentration in the most critical section of stress concentration in crankshaft. This developed model holds the potential to optimize fuel consumption and improve transport sustainability.</p> </abstract>

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Analysis of the Influences of Piston Crankshaft Offset on Piston Secondary Movements

Cited by 3 publications

References 3 publications

Desarrollo de una metodología para calcular los niveles de emisiones contaminantes en motores de combustión interna alternativos

Desarrollo de una metodología para calcular los niveles de emisiones contaminantes en motores de combustión interna alternativos

Validated Analytical Modeling of Eccentricity and Dynamic Displacement in Diesel Engines with Flexible Crankshaft

Retraction: Validated analytical modelling of frequency-based aspects, eccentricity and stress concentration in diesel engines with flexible crankshaft

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