Influence of Piston Slap on Engine Block Vibration

Fabi, P.; Flekiewicz, M.; Madej, H.; Wojnar, G.; Flekiewicz, B.

doi:10.4271/2007-01-2163

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Griffiths et al [4] investigated the effect of coolant temperature on the vibration of a single-cylinder diesel engine by frequency spectrum analysis and noted that piston slap was also the main factor that affected the vibration. Fabi et al [5] further studied the influence of piston slap on engine block vibration. Wang et al [6] explored the relationship between faults in the valve train and the vibration of a diesel cylinder head, and a fault analysis method of vibration signals using Wigner-Ville distributions and probabilistic neural networks was developed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Coaxial Balance Mechanism for Reciprocating Piston Engines

Guan

Wang

et al. 2021

Applied Sciences

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Vibration is an important issue faced by reciprocating piston engines, and is caused by reciprocating inertia forces of the piston set. To reduce the vibration without changing the main structure and size of the original engine, we proposed a novel coaxial balance mechanism design based on a compact unit body. By introducing a second-order balance mass, this mechanism can significantly increase the efficiency of vibration reduction. The proposed mechanism can effectively balance the first-order and second-order inertia forces with the potential of balancing high-order inertia forces. To accurately determine the second-order balance mass, a closed-form method was developed. Simulation results with a single-cylinder piston DK32 engine demonstrate the effectiveness and advantage of the proposed mechanism. At a crankshaft speed of 2350 r/min, compared with the first-order balance device, the average root mean square velocity of the test points on the engine’s cylinder was reduced by 97.31%, and the support reaction force was reduced by 96.54%.

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Section: Introductionmentioning

confidence: 99%

A Novel Coaxial Balance Mechanism for Reciprocating Piston Engines

Guan

Wang

et al. 2021

Applied Sciences

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“…In [28][29][30][31], the authors used EEMD (Ensemble Empirical Mode Decomposition), coherent power spectrum analysis and improved AHP (Analytic Hierarchy Process) methods for identification of the noise and evaluating different engine damage. An interesting application of vibration signal processing methods was presented in [19], where the use of the continuous wavelet decomposition made it possible to separate signals caused by the combustion process and those caused by the excessive clearance of the piston in the cylinder sleeve. The authors of [13][14][15][16][17][18] presented the possibility of using signal filtration in order to separate components related to the increased valve clearance from components resulting from the combustion process.…”

Section: Introductionmentioning

confidence: 99%

“…In [11,12] damage to the hydraulic tensioner of the timing chain system was studied and in [13][14][15][16][17][18] the excessive valve clearance of the combustion engine. Vibroacoustic signals were also used in [19,20], where excessive clearance between the piston and the cylinder sleeve of the engine was detected. Another interesting study was described in [21][22][23][24][25][26], where vibroacoustic signals were used for analyzing the influence of the type of fuel supplied to the engine on its work characteristics.…”

Section: Introductionmentioning

confidence: 99%

The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance

Figlus¹,

Gnap²,

Skrúcaný³

et al. 2016

Entropy

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Abstract:The paper presents a method for processing acoustic signals which allows the extraction, from a very noisy signal, of components which contain diagnostically useful information on the increased valve clearance of a combustion engine. This method used two-stage denoising of the acoustic signal performed by means of a discrete wavelet transform. Afterwards, based on the signal cleaned-up in this manner, its entropy was calculated as a quantitative measure of qualitative changes caused by the excessive clearance. The testing and processing of the actual acoustic signal of a combustion engine enabled clear extraction of components which contain information on the valve clearance being diagnosed.

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Study on the correlation between combustion status and block vibration induced by piston slap

Jiang²,

Wang³

et al. 2022

Applied Acoustics

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Influence of Piston Slap on Engine Block Vibration

Cited by 5 publications

References 13 publications

A Novel Coaxial Balance Mechanism for Reciprocating Piston Engines

A Novel Coaxial Balance Mechanism for Reciprocating Piston Engines

The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance

Study on the correlation between combustion status and block vibration induced by piston slap

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