Elastodynamic transient analysis of a four-cylinder valvetrain system with camshaft flexibility

This paper presents an analysis of a line of valvetrains in a four-cylinder, four-stroke in-line diesel engine. The method highlighted in this paper predicts the vibration signature together with the prevailing contact conditions and frictional characteristics exhibited in the valvetrain system. This integrated dynamic and tribological investigation provides a practical approach that can be used during the design or the evaluation phase of automotive valvetrain systems

Estimating the loading condition of a diesel engine using instantaneous angular speed analysis

Continuing monitoring of diesel engine performance is critical for early detection of fault developments in the engine before they materialize and become a functional failure. Instantaneous crank angular speed (IAS) analysis is one of a few non intrusive condition monitoring techniques that can be utilized for such tasks. In this experimental study, IAS analysis was employed to estimate the loading condition of a 4-stroke 4-cylinder diesel engine in a laboratory condition. It was shown that IAS analysis can provide useful information about engine speed variation caused by the changing piston momentum and crankshaft acceleration during the engine combustion process. It was also found that the major order component of the IAS spectrum directly associated with the engine firing frequency (at twice the mean shaft revolution speed) can be utilized to estimate the engine loading condition regardless of whether the engine is operating at normal running conditions or in a simulated faulty injector case. The amplitude of this order component follows a clear exponential curve as the loading condition changes. A mathematical relationship was established for the estimation of the engine power output based on the amplitude of the major order component of the measured IAS spectrum

Las colecciones paleontológicas del Museo de Ciencias Naturales AVAN (Viso del Marqués, Ciudad Real)

XXXIV Jornadas de Paleontología y IV Congreso Ibérico de Paleontología (Villareal, Portugal; sep 2018) p 19-25Este año 2018 se celebra el XXX aniversario del Museo de Ciencias Naturales (AVAN) de Viso del Marqués (Ciudad Real), creado de acuerdo a los fines fundacionales de la Asociación Viseña Amigos de la Naturaleza (Estatutos AVAN, 1988). Se trata de un museo de ciencias naturales con amplias, variadas e importantes colecciones de patrimonio natural, la mayor parte, resultado de donaciones de personas que han dedicado parte de su vida a su recopilación y estudio. Además, es una de las colecciones de historia natural más importantes de Castilla-La Mancha, en especial sus fondos paleontológicos. Cuenta con un diseño museográfico práctico y una cartelería de gran calidad y rigor científico, como resultado de las diversas renovaciones y las diferentes aportaciones del Museo Geominero de Madrid, que en todo momento ha colaborado y asesorado, prestando colecciones itinerantes de gran valor y cediendo material gráfico y didáctico. Cabe destacar en cualquier caso la gran riqueza en fósiles de Castilla-La Mancha, con su gran cantidad de yacimientos, favorecido por la gran extensión de sus provincias y la gran cantidad de sistemas y ambientes geológicosMuseo Geominero, Instituto Geológico y Minero de EspañaMuseo AVAN, Viso del Marqués, Ciudad Rea

Elastodynamic transient analysis of a four-cylinder valvetrain system with camshaft flexibility

This paper presents an analysis of a line of valvetrains in a four-cylinder, four-stroke in-line diesel engine. The method highlighted in this paper predicts the vibration signature together with the prevailing contact conditions and frictional characteristics exhibited in the valvetrain system. This integrated dynamic and tribological investigation provides a practical approach that can be used during the design or the evaluation phase of automotive valvetrain systems