Simulation of Secondary Dynamics of Articulated and Conventional Piston Assemblies

Date

1992-01-01

Author

Dursunkaya, Zafer

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

170
views

0
downloads

This paper describes a general model for the analysis of secondary motions in conventional and articulated piston assemblies. The model solves for the axial, lateral and rotational departures in positions and motions from the nominal kinematics, resulting from clearances within the piston assembly and also between the piston assembly components and the cylinder. The methodology allows the characterization of conventional and articulated piston secondary motions in the thrust plane of the cylinder. Motions of the piston, pin, rod and (for articulated pistons) skirt are separately calculated, by integrating equations of motion for individual components and dynamic degrees of freedom. Various configurations with respect to rigid attachment of the wristpin to other components can also be represented. In the equations of motions solved, all gas pressure, inertia, friction and oil or contact pressure forces are accounted for. Detailed submodels of skirt and wristpin lubrication are utilized to calculate the effect of these oil films. All pertinent operating parameters (engine speed and cyclic pressure variation) as well as design parameters, such as component masses, moments of inertia, mass centers, pin offsets etc. are specifiable to the model as inputs. The model was applied, in conjunction with the skirt and wristpin lubrication submodels, to conventional and articulated pistons, in a number of parametric studies. Effects of speed, load and piston configuration were investigated.

Subject Keywords

Pistons, Engine cylinders, Assembling

URI

https://hdl.handle.net/11511/45952

Journal

SAE Transactions Journal of Engines

DOI

https://doi.org/10.4271/920484

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Modeling of piston secondary dynamics and tribology Keribar, Rifat; Dursunkaya, Zafer (1992-06-01) This paper describes a general, design-oriented model for the analysis of secondary motions in conventional and articulated piston assemblies. The model solves for the axial, lateral and rotational departures in positions and motions from the nominal kinematics, resulting from clearances within the piston assembly and also between the piston assembly components and the cylinder. In order to accurately represent the effect of oil films, the model includes comprehensive treatments of hydrodynamic and boundary...
Analysis of thin walled open section tapered beams using hybrid stress finite element method Akman, Mehmet Nazım; Oral, Süha; Department of Mechanical Engineering (2008) In this thesis, hybrid stress finite element is formulated for the analysis of the isotropic, thin walled, open section beams with variable cross sections. The beam element has two nodes each having seven degrees of freedom. Assumption of stress field is sufficient to determine the element stiffness matrix. Axial, flexural and torsional effects are taken into account in the analysis. The methodology can be applied both to the tapered and the uniform beams. Throughout this study, firstly element cross-sectio...
Optimization of Power Conversion Efficiency in Threshold Self-Compensated UHF Rectifiers With Charge Conservation Principle Gharehbaghi, Kaveh; KOÇER, FATİH; Külah, Haluk (2017-09-01) This paper presents a compact model for threshold self-compensated rectifiers that can be used to optimize circuit parameters early in the design phase instead of time-consuming transient simulations. A design procedure is presented for finding the optimum aspect ratio of transistors used in the converter and number of rectifying stages to achieve the maximum power conversion efficiency. In the presented analysis, the relation between the power conversion efficiency and the load current over the variation o...
Computation of turbulent flows around rotating bodies using unstructured grids Gönç, L.O.; Ak, M.A.; Tuncer, İsmail Hakkı; Aksel, M.H. (2006-01-01) This paper presents the development of a 3-D parallel flow solver for turbulent flows around rotating bodies using unstructured grids. Cell centered finite volume solver which employs Roe's upwind flux differencing scheme, Spalart-Allmaras turbulence model and Runge-Kutta explicit multistage time stepping scheme is presented. Arbitrary Lagrangian Eulerian (ALE) formulation is implemented for moving grids. The computational grid is partitioned by METIS and PVM is used for inter-process communication. The mai...
Modeling of the nonlinear behavior of steel framed structures with semi rigid connections Sarıtaş, Afşin; Özel, Halil Fırat (null; 2015-07-21) A mixed formulation frame finite element with internal semi-rigid connections is presented for the nonlinear analysis of steel structures. Proposed element provides accurate responses for spread of inelasticity along element length by monitoring the nonlinear responses of several crosssections, where spread of inelasticity over each section is captured with fiber discretization. Each material point on the section considers inelastic coupling between normal stress and shear stress. The formulation of the ele...

Citation Formats

Z. Dursunkaya, “Simulation of Secondary Dynamics of Articulated and Conventional Piston Assemblies,” SAE Transactions Journal of Engines, pp. 853–863, 1992, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/45952.