Analytical Evaluation of Fitted Piston Compression Ring: Modal Behaviour and Frictional Assessment

Baker, Christopher E.; Rahnejat, Homer; Rahmani, Ramin; Theodossiades, Stephanos

doi:10.4271/2011-01-1535

Cited by 11 publications

(6 citation statements)

References 21 publications

(21 reference statements)

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“…In practice, however, the bore is out-of-round 20 although every effort is made for the current floating liner to closely approximate an idealised right circular cylindrical shape. Furthermore, the ring is subjected to variable chamber pressure loading, 21 thus in reality ring dynamic occurs, [22][23][24] which would ideally require a lengthy two-dimensional solution such as those developed in Ma et al, 25 Bolander et al 26 and Mishra et al 27,28 Nevertheless, for the conditions described in this paper a one-dimensional analytical solution is quite adequate and shows good conformance to the measurements. In fact, such a combined analytical-experimental approach has not hitherto been reported in literature.…”

Section: Introductionmentioning

confidence: 98%

Assessment of friction from compression ring conjunction of a high-performance internal combustion engine: A combined numerical and experimental study

Gore¹,

Rahmani

Rahnejat

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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The paper presents direct measurement of in-cylinder friction from a single cylinder motocross race engine under motored conditions and compares the same with a new analytical predictive method. These conditions are encountered in piston-cylinder system with the application of cylinder deactivation (CDA) technology, which is a growing trend. The analytical method takes into account the various regions within instantaneous contact of compression ring-cylinder liner, including lubricant film rupture, cavitation zone and the subsequent lubricant film reformation. The analysis also includes the effect of boundary friction and lubricant rheology. The predictions and direct measurements of cyclic friction show good agreement and indicate dominance of viscous friction under the investigated engine running conditions. In particular, it is shown that the compression ring contribution to in-cycle friction is most pronounced in the region of high cylinder pressures because of combined Poiseuille friction and some boundary solid interactions. The combined experimental-analytical approach has not hitherto been reported in literature.

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Section: Introductionmentioning

confidence: 98%

Assessment of friction from compression ring conjunction of a high-performance internal combustion engine: A combined numerical and experimental study

Gore¹,

Rahmani

Rahnejat

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…The deviations between the numerical predictions of friction [16] and the measurements [17] were seen to be due to ring dynamics as well as generated heat in the contact, not included in the analysis. The effect of shear and compressive heating of the lubricant in the ring-bore conjunction under engine motored (not fired condition) was found to be marginal, when compared to an isothermal analysis by Baker et al [18]. The same, of course, is not true of engine fired condition, where there is still a dearth of comparative studies, owing to measurement of friction from the compression conjunction in isolation from the whole piston-cylinder system under fired condition.…”

Section: Introductionmentioning

confidence: 89%

On the Transient Three-Dimensional Tribodynamics of Internal Combustion Engine Top Compression Ring

Baker

Theodossiades

Rahmani

et al. 2017

Journal of Engineering for Gas Turbines and Power

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There are increasing pressures upon the automotive industry to reduce harmful emissions as well as meeting the key objective of enhanced fuel efficiency, while improving or retaining the engine output power. The losses in an internal combustion (IC) engine can be divided into thermal and parasitic as well as due to gas leakage because of untoward compression ring motions. Frictional losses are particularly of concern at low engine speeds, assuming a greater share of the overall losses. Piston–cylinder system accounts for nearly half of all the frictional losses. Loss of sealing functionality of the ring pack can also contribute significantly to power losses as well as exacerbating harmful emissions. The dynamics of compression ring is inexorably linked to its tribological performance, a link which has not been made in many reported analyses. A fundamental understanding of the interplay between the top compression ring three-dimensional elastodynamic behavior, its sealing function and contribution to the overall frictional losses is long overdue. This paper provides a comprehensive integrated transient elastotribodynamic analysis of the compression ring to cylinder liner and its retaining piston groove lands' conjunctions, an approach not hitherto reported in the literature. The methodology presented aims to aid the piston ring design evaluation processes. Realistic engine running conditions are used which constitute international drive cycle testing conditions.

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“…The deterministic roughness characterization and asperity tip assumption to circular shape with measured roughness value (Xu and Sadeghi, 1996) are also of use in solving EHL problems. In the recent advances, the elastohydrodynamic lubrication of piston ring (Oh et al, 1987), thermo mixed hydrodynamic technique (Shahmohamadi et al, 2013), analytical evaluation of fitted compression ring modal behavior (Baker et al, 2011) and experimental evaluation of piston assembly friction in motored and fired condition (Mufti and Priest, 2005) are developed to supplement ring research. In addition to this, correlation study of piston ring design and lubrication (Söderfjäll et al, 2017), piston ring condition monitoring on basis of combustion and thermal characteristics (Mohamed, 2018) found useful in ring analysis.…”

Section: Introductionmentioning

confidence: 99%

Thermal Modeling of Thin Lubricant Film Within Piston Compression Ring and Rough Cyliner Liner Conjuction

Mishra

2020

Front. Mech. Eng.

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This work is devoted to develop a transient thermo elastohydrodynamic model for thermal analysis of micro scale oil film with in piston compression ring-liner conjunction. In this paper, heat dissipation through piston to cylinder wall mainly considered via thin film of lubricant on convection and conduction mode. It also includes frictional heat generated due to ring liner co-action while balancing total heat of the engine system. Results presented in this paper show that frictional heating raises additional lubricant temperature of 90 • C. Such increase in temperature is one of the reasons for presence of further oil degradation in high pressure zone of engine cycle, which appears between 300 and 400 • crank location.

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Analytical Evaluation of Fitted Piston Compression Ring: Modal Behaviour and Frictional Assessment

Cited by 11 publications

References 21 publications

Assessment of friction from compression ring conjunction of a high-performance internal combustion engine: A combined numerical and experimental study

Assessment of friction from compression ring conjunction of a high-performance internal combustion engine: A combined numerical and experimental study

On the Transient Three-Dimensional Tribodynamics of Internal Combustion Engine Top Compression Ring

Thermal Modeling of Thin Lubricant Film Within Piston Compression Ring and Rough Cyliner Liner Conjuction

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