Effects of Viscous Friction and Non-Friction Damping Mechanisms in a Reciprocating Engine

Wang, Y.; Lim, Teik C.

doi:10.1006/jsvi.2001.4229

Cited by 3 publications

(6 citation statements)

References 5 publications

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“…The ring-pack static friction force (F∞) was determined by measurement and found to be consistent with ones given by Guzzomi et al 27 The boundary friction coefficient of piston was taken from Ye et al 37 For the hydrodynamic friction, or hydrodynamic friction coefficient, of the piston, Dowson et al 34 suggested a Couette flow approximation. The hydrodynamic friction coefficient of the main bearings and big-end bearings of connecting rods were taken from Wang and Lim 38 and Durak et al 39 The predictions made for the same bearings via Couette flow were also found to be comparable with Wang and Lim 38 and Durak et al 39 The firing phase angle between the two pistons was taken to be 2π radians, which enables repetition of the power strokes with equal periods. The inputs used in the numerical applications are given in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…For Hydrodynamic friction, or hydrodynamic friction coefficient of the piston, Dawson et al [25] suggested the Couette flow approximation. The hydrodynamic friction coefficient of the main bearings and big-end bearings of piston conrod were taken from Wang and Lim [21] and Durak et al, [26]. The predictions made for the same bearings via Couette flow is also found to be comparable with [21] and [26].…”

Section: Inputs and Numerical Solutionmentioning

confidence: 87%

“…The hydrodynamic friction coefficient of the main bearings and big-end bearings of piston conrod were taken from Wang and Lim [21] and Durak et al, [26]. The predictions made for the same bearings via Couette flow is also found to be comparable with [21] and [26]. The crank angle between two pistons is assumed to be 2π rad, which enables repetition of the power strokes with equal crankshaft angles.…”

Section: Inputs and Numerical Solutionmentioning

confidence: 99%

“…The proportionality coefficient, named as viscous damping coefficient, was found to be not a simple constant, for both sliding and rolling motions. It is affected by speed and vibratory motion of sliding and rolling elements [21]. The contact friction generates a force similar to the dry friction.…”

Section: Introductionmentioning

confidence: 99%

“…ϒ &&& , (0) β &&& , (0) ϑ &&& were approximately calculated. Using equations (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) approximate values of (0…”

mentioning

confidence: 99%

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Dynamic model of a two-cylinder four-stroke internal combustion engine and vibration treatment

Karabulut

2012

International Journal of Engine Research

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Engine vibrations of large amplitude are caused by inertial effects of the piston–crankshaft mechanism and gas forces, and are transmitted to the chassis of a vehicle in the form of periodically varying forces through the engine mounts. Both the engine vibrations and mount forces may be minimized by designing proper engine components and mounts, which requires a dynamic simulation of the engine. In this study, a three degree of freedom dynamic model, enabling the simultaneous treatment of the piston–crankshaft mechanism and engine block, was devised for a two-cylinder four-stroke engine. Periodic and temporary variations of crankshaft speed, the variation of torque and power with speed, torsional and translational vibrations of the engine block, and the variation of mount forces with respect to the damping and stiffness coefficients of the mounts were studied. The torsional and translational vibrations of the engine block were found to be mainly affected by the combustion gas force and inertia force of the reciprocating masses, respectively. A simple relation has been obtained to determine the position and mass of counterweights used for eliminating the vertical vibration of the block.

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Section: Resultsmentioning

confidence: 99%

Section: Inputs and Numerical Solutionmentioning

confidence: 87%

Section: Inputs and Numerical Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…ϒ &&& , (0) β &&& , (0) ϑ &&& were approximately calculated. Using equations (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) approximate values of (0…”

mentioning

confidence: 99%

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Dynamic model of a two-cylinder four-stroke internal combustion engine and vibration treatment

Karabulut

2012

International Journal of Engine Research

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Fuzzy sliding mode control based on disturbance observer for electromechanical actuator on guided projectile

Wei

Wang

et al. 2017

2017 IEEE International Conference on Unmanned Systems (ICUS)

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The Impact of Non-constant Inertia and Nonlinear Damping on the Torsional Vibration Characteristics of Internal Combustion Engine Including External Forces

Lafta¹

2022

KJAR

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Failures of the crankshaft-slider mechanism are the most reasons that affect the durability and operational reliability of the internal combustion engine. An accurate and sophisticated nonlinear dynamic model overcomes the obvious simulation errors of linearized models. The present work studies the effect of the non-conservative forces and nonlinear damping on the torsional vibration of single-cylinder internal combustion engines. Comprehensive dynamic modeling based on a developed expression for the instantaneous kinetic energy of the reciprocating parts and a general model of the overall kinetic energy of the system in terms of the inertia parameters were derived. The effect of variable inertia and nonlinear damping on the damped forced response of slider-crank assembly of the engine was investigated using the numerical integration method. The numerical results show that the phenomenon of secondary rolling excitation torque is well activated and gives arises to variation of frequencies and their corresponding amplitudes. Also, the amplitude of the external excitation torque is strengthened by the secondary excitation inertia torque and introduces multi resonance amplitudes phenomenon and widening the critical range of engine speed which results in producing of dangerous vibrational stress amplitudes. Also, the damped forced results indicate that the presents of damping lead to a vital reduction in the amplitude of torsional displacement and excitation torques. The present work aims to enhance nonlinear dynamic modeling and introduces more reliable design for reciprocating engine crankshaft assembly.

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Effects of Viscous Friction and Non-Friction Damping Mechanisms in a Reciprocating Engine

Cited by 3 publications

References 5 publications

Dynamic model of a two-cylinder four-stroke internal combustion engine and vibration treatment

Dynamic model of a two-cylinder four-stroke internal combustion engine and vibration treatment

Fuzzy sliding mode control based on disturbance observer for electromechanical actuator on guided projectile

The Impact of Non-constant Inertia and Nonlinear Damping on the Torsional Vibration Characteristics of Internal Combustion Engine Including External Forces

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