Vibrations and noise due to piston-slap in reciprocating machinery

Ungar, Eric E.; Ross, Donald

doi:10.1016/0022-460x(65)90091-x

Cited by 68 publications

(29 citation statements)

References 3 publications

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“…Structural analysis has been reported using FEA [14,22]. A direct relationship was established between the vibration levels of the engine block and the excitation force/surface velocities at the impact sites of the cylinder liner's inner surface [11,12]. The impact impedance has been used at each contact point between the piston and the cylinder liner in order to predict the surface vibrations of the engine block.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…In earlier studies of piston dynamics, the effects of lubrication were generally neglected [10,11]. Later, a coefficient of friction was included in the equations of motion to account for the frictional losses [17].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have been reported in modelling the cylinder pressure analytically [6,7], whilst this is commonly measured for piston-slap investigations [3,8,9]. Models describing piston dynamics usually exclude its tilting motion through piston pin rotation [10,11] or simply use constrained Lagrangian dynamics to include the component reactions due to piston rotation [8,12]. Methodologies involving multibody dynamics and Finite Element Analysis (FEA) software, such as MSC ADAMS and NASTRAN, have been reported for the study of piston secondary motion [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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A transient tribodynamic approach for the calculation of internal combustion engine piston slap noise

Dolatabadi

Littlefair

Cruz

et al. 2015

Journal of Sound and Vibration

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a b s t r a c tAn analytical/numerical methodology is presented to calculate the radiated noise due to internal combustion engine piston impacts on the cylinder liner through a film of lubricant. Both quasi-static and transient dynamic analyses coupled with impact elastohydrodynamics are reported. The local impact impedance is calculated, as well as the transferred energy onto the cylinder liner. The simulations are verified against experimental results for different engine operating conditions and for noise levels calculated in the vicinity of the engine block. Continuous wavelet signal processing is performed to identify the occurrence of piston slap noise events and their spectral content, showing good conformance between the predictions and experimentally acquired signals.

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Section: List Of Symbolsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A transient tribodynamic approach for the calculation of internal combustion engine piston slap noise

Dolatabadi

Littlefair

Cruz

et al. 2015

Journal of Sound and Vibration

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“…This can be understood from Fig.1 (Cho et al, 2002). Several models have been used earlier to understand the basics of piston motion (Unger and Ross, 1965). The Finite Element Analysis (FEA) has been used to predict the impact forces .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Piston Slap Motion

Narayan¹

2015

International Journal of Applied Mechanics and Engineering

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Piston slap is the major force contibuting towards noise levels in combustion engines.This type of noise depends upon a number of factors such as the piston-liner gap, type of lubricant used, number of piston pins as well as geometry of the piston. In this work the lateral and rotary motion of the piston in the gap between the cylinder liner and piston has been analyzed. A model that can predict the forces and response of the engine block due to slap has been dicussed. The parameters such as mass, spring and damping constant have been predicted using a vibrational mobility model.

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“…The piston impact problem comprises the piston secondary motion dynamics, the lubrication of the contacting surfaces and their structural deformations. The early studies concentrated mainly on the dynamics [8,9]. In more advanced piston models, structural deformation and the lubricant's cushioning effects are described using stiffness and damping elements ('dry' models) [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Passive Control of Piston Secondary Motion Using Nonlinear Energy Absorbers

Dolatabadi

Theodossiades

Rothberg

2017

Journal of Vibration and Acoustics

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The impulsive behaviour of the piston in the cylinder liner plays a key role in the Noise, Vibration and Harshness (NVH) of internal combustion engines. There have been several studies on the identification and quantification of piston impact action under various operation conditions. In the current study, the dynamics of the piston secondary motion are initially explored in order to describe the aggressive oscillations, energy loss and noise generation. The control of piston secondary motion (and thus, impacts) is investigated using a new passive approach based on energy transfer of the highly transient oscillations to a nonlinear absorber. The effectiveness of this new method for improving the piston impact behaviour is discussed using a preliminary parametric study that leads to the conceptual design of a nonlinear energy absorber.

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Vibrations and noise due to piston-slap in reciprocating machinery

Cited by 68 publications

References 3 publications

A transient tribodynamic approach for the calculation of internal combustion engine piston slap noise

A transient tribodynamic approach for the calculation of internal combustion engine piston slap noise

Analysis of Piston Slap Motion

Passive Control of Piston Secondary Motion Using Nonlinear Energy Absorbers

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