On the identification of piston slap events in internal combustion engines using tribodynamic analysis

Dolatabadi, Nader; Theodossiades, Stephanos; Rothberg, Steve

doi:10.1016/j.ymssp.2014.11.012

Cited by 49 publications

(43 citation statements)

References 19 publications

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“…However, distinctive transient responses can be clearly observed corresponding to all six impact events that are predicted based on the sign changes of piston thrust force [12], which are A , can also be observed in Fig.8 (a). These events correspond to the secondary impacts induced by high amplitudes of thrust force, rather than by a particular force peak, showing that the sustained high-amplitude side-thrust force may also cause additional impacts.…”

Section: ) Dynamic Responses To Piston Slapsmentioning

confidence: 63%

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A validated finite element model for predicting dynamic responses of cylinder liners in an IC engine

Wei

et al. 2016

2016 22nd International Conference on Automation and Computing (ICAC)

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Abstract-Vibration of cylinder liners affects not only engine combustion performances but also tribological behaviour and noise radiations. However, it is difficult to characterize it experimentally due to multiple sources, strong background noise, and nonlinear transfer paths. Therefore, a finite element model is established in this study to predict the dynamic responses of cylinder liners under respective sources. The model takes into account both the characteristics of structural modes and nonlinearities of assembly constraints when selecting adequate elements for efficient computation of the responses under both the highly nonlinear combustion pressure excitations and subsequent piston slap impacts. The predictions are then evaluated against experimental results under different engine operating conditions. In addition, continuous wavelet analysis is employed to process the complicated responses for key response events and their frequency ranges. The results show agreeable correspondences between the numerical predictions and measured vibration signals, paving the way for investigating its effect on combustion and lubrication processes.

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Section: ) Dynamic Responses To Piston Slapsmentioning

confidence: 63%

“…5. [11,12]. Obviously, the force amplitude of Impact B occurring around the power TDC at 360° is the most significant one.…”

Section: B Vibration Excitations Of Cylinder Linersmentioning

confidence: 99%

A validated finite element model for predicting dynamic responses of cylinder liners in an IC engine

Wei

et al. 2016

2016 22nd International Conference on Automation and Computing (ICAC)

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“…Combustion shock and piston slap are generally considered to be the two main excitation sources of the cylinder dynamics [18]. According to the authors' previous paper, the response induced by combustion shock has a predicted amplitude of approximately 0.02 microns, being much less than the friction surfaces' roughness, which can be considered negligible for predicting lubrications between piston rings and liners.…”

Section: Establishment Of Dynamic Modelmentioning

confidence: 99%

“…Previous studies [18,19] have often chosen the frequency range between 500 and 3000 Hz as the analysis band for the identification and analysis of vibration events induced by piston slap. As Figure 5 shows, there is probably some truth to this, which may stem from mode characteristics inherent in liner structures.…”

Section: Geometric Extraction and Coordinate Transformationmentioning

confidence: 99%

An Improved Lubrication Model between Piston Rings and Cylinder Liners with Consideration of Liner Dynamic Deformations

Wang

et al. 2017

Energies

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Abstract:The friction pair of piston rings and cylinder liner is one of the most important friction couplings in an internal combustion engine. It influences engine efficiency and service life. Under the excitation of piston slaps, the dynamic deformation of cylinder liner is close to the surface roughness magnitudes, which can affect the friction and lubrication performance between the piston rings and cylinder assemblies. To investigate the potential influences of structural deformations to tribological behaviours of cylinder assemblies, the dynamic deformation of the inner surface due to pistons slaps is obtained by dynamic simulations, and then coupled into an improved lubrication model. Different from the traditional lubrication model which takes the pressure stress factor and shear stress factor to be constant, the model proposed in this paper calculated these factors in real time using numerical integration to achieve a more realistic simulation. Based on the improved piston rings and cylinder liner lubrication model, the minimum oil film thickness and friction force curves are obtained for an entire work cycle. It shows that the friction force obtained from the improved model manifests clear oscillations in each stoke, which is different from the smoothed profiles predicted traditionally. Moreover, the average amplitude of the friction forces also shows clear reduction.

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“…The frequency range between 500 and 3000 Hz has been chosen by earlier studies [9,10,[21][22][23]] to identify and analyze the piston slap-induced events. As Figure 13 shows, there is probably some truth to this, which may stem from mode characteristics inherent in liner structures.…”

Section: Dynamic Responses To Piston Slapsmentioning

confidence: 99%

Investigation into the Vibrational Responses of Cylinder Liners in an IC Engine Fueled with Biodiesel

Wang

et al. 2017

Applied Sciences

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Abstract:The paper presents a study of the relationship between the combustion behavior and vibration response of internal combustion (IC) engines fueled with biodiesel based on finite element modelling along with experimental evaluation. An improved finite element (FE) model is established and validated to predict the dynamic responses of cylinder liners with respect to two main sources: combustion shock and piston side thrust. Based on the validated FE model, the response characteristics of the cylinder liner in an IC engine fueled with biodiesel and its causal relationship with excitation sources have been predicted. Due to the lower calorific value of biodiesel, a greater amount of fuel is injected into the combustion chamber to maintain power outputs, which results in a prolonged combustion duration and subsequent higher overall vibration levels, compared with that of diesel. The advanced ignition of biodiesel is the main cause to the compound effect on the coupling of piston side-thrust force, thereby resulting in a nonlinear increase in the root mean square (RMS) of local vibration response close to the combustion top dead center (TDC). These key findings provides insight understandings for not only biodiesel combustion diagnostics but also more accurate diagnostics of fossil diesel based on nonintrusive vibrations.

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On the identification of piston slap events in internal combustion engines using tribodynamic analysis

Cited by 49 publications

References 19 publications

A validated finite element model for predicting dynamic responses of cylinder liners in an IC engine

A validated finite element model for predicting dynamic responses of cylinder liners in an IC engine

An Improved Lubrication Model between Piston Rings and Cylinder Liners with Consideration of Liner Dynamic Deformations

Investigation into the Vibrational Responses of Cylinder Liners in an IC Engine Fueled with Biodiesel

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