Numerical and Experimental Study of Friction on a Single Cylinder CFR Engine

Ciulli, Enrico; Rizzoni, Giorgio; Dawson, J.

doi:10.4271/960357

Cited by 14 publications

(16 citation statements)

References 4 publications

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“…Friction modeling in transient simulation codes has, almost, always in the past (with a few notable exceptions [13][14][15][16][17][18]) been applied in the form of mean fmep relations, remaining constant for every degree crank angle in each cycle in the model simulation; thus, the effect of real friction torque on the model's predictive capabilities was limited. This is primarily attributed to the scarcity-complexity of detailed, per degree crank angle, friction simulations.…”

Section: Introductionmentioning

confidence: 99%

“…Gardner and Henein [15], as regards engine starting, and Tuccilo et al [16] gave some preliminary transient results adopting the semi-empirical RezekaHenein [19] friction model. Ciulli et al [18] developed 3 friction models of various complexity and incorporated them in a simplified dynamic simulation. The objective was to determine which of these models captured most effectively transient engine operation.…”

Section: Introductionmentioning

confidence: 99%

“…In all the works where analytical friction modeling was incorporated into the simulation code, this was, mainly, accomplished in an attempt to predict engine transient response more accurately. However, no comparison was presented with the results obtained using fmep relations; moreover, no attempt was made to study the development of friction components during transients, possibly with the exception of a few results presented in [18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Various Dynamic Issues During Transient Operation of Turbocharged Diesel Engine with Special Reference to Friction Development

Rakopoulos¹,

Giakoumis²,

Dimaratos³

2007

SAE Technical Paper Series

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The modeling of transient turbocharged diesel engine operation appeared in the early seventies and continues to be in the focal point of research, due to the importance of transient response in the everyday operating conditions of engines. The majority of research has focused so far on issues concerning thermodynamic modeling, as these directly affect heat release predictions and consequently performance and pollutants emissions. On the other hand, issues concerning the dynamics of transient operation are often disregarded or over-simplified, possibly for the sake of speeding up program execution time. In the present work, an experimentally validated transient diesel engine simulation code is used to study and evaluate the importance of such dynamic issues. First of all, the development of various forces (piston, connecting rod, crank and main crankshaft bearings) is computed and illustrated in order to evaluate the importance of abrupt load increases on the bearings durability. The usual approximation of the connecting rod being considered as equivalent to two masses (one reciprocating with the piston and the other rotating with the crank) is put into test. The same holds true for another usual assumption, i.e. the crankshaft being considered as sufficiently rigid. In this work, the engine crankshaft is analyzed in detail with the instantaneous torsional angle between engine and load taken into account. Thus, details are provided concerning the development of crankshaft torsional deformation during transients. The main part of the paper focuses on the development and contribution of various friction components during turbocharged diesel engine transients. This is accomplished via the use of a recently proposed detailed friction model. Mean fmep (friction mean effective pressure) modeling is found to considerably underestimate actual friction around firing TDC, leading to lower speed droops for abrupt load increases. The piston rings assembly contribution is dominant for the particular engine, due to its high number of piston rings and its relatively low crankshaft speed. The model can be used to investigate such interesting cases as the effect of engine oil temperature on engine transient response, or the variation of oil film thickness during a cycle or a transient event.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Various Dynamic Issues During Transient Operation of Turbocharged Diesel Engine with Special Reference to Friction Development

Rakopoulos¹,

Giakoumis²,

Dimaratos³

2007

SAE Technical Paper Series

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show abstract

“…Taj pristup koristio je znatan broj autora, pa se u tom smislu može smatrati dovoljno pouzdanim, a dodatnu prednost predstavlja to što su potrebni empirijski podaci eksperimentalno verifikovani na različitim klasama motora. Takav pristup može se naći u radovima Čulija (Ciulli) [150], Gucomija (Guzzomi) [151,152], Taraze [153,154], Zveirija [8,155], Rakopulosa [156], Kuremenosa [157], Tringa [158], Lina i Patersona [159]. Izuzev u osnovama modela, razlike se mogu uočiti u detaljima koji se odnose na klasu motora kojoj je model prilagoĎen (npr.…”

Section: Model Mehaničkih Gubitaka U Kontaktu Klipni Prsten -Cilindarunclassified

“…Za odreĎivanje koeficijenta trenja u kontaktu klipni prsten -cilindar, Čuli, Riconi i Doson (Dawson) [150] koriste dve različite relacije, u zavisnosti od toga koji je trenutni režim podmazivanja:…”

Section: Sl 73 -Načelan Prikaz Zavisnosti Koeficijenta Trenja I Strunclassified

Dynamic interaction between the structure and the trolley of high performance gantry cranes

Popović¹

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Friction in Lubricated Contacts: from Macro- to Microscale Effects

Ciulli

2001

Fundamentals of Tribology and Bridging the Gap Between the Macro- And Micro/Nanoscales

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Numerical and Experimental Study of Friction on a Single Cylinder CFR Engine

Cited by 14 publications

References 4 publications

Evaluation of Various Dynamic Issues During Transient Operation of Turbocharged Diesel Engine with Special Reference to Friction Development

Evaluation of Various Dynamic Issues During Transient Operation of Turbocharged Diesel Engine with Special Reference to Friction Development

Dynamic interaction between the structure and the trolley of high performance gantry cranes

Friction in Lubricated Contacts: from Macro- to Microscale Effects

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