Acoustical Optimization of the Piston Slap by Combination of Computing and Experiments

Kaiser, H.; Schmilien, K.; Spessert, Bruno

doi:10.4271/880100

Cited by 13 publications

(2 citation statements)

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“…The influential factors are classified to those related to the engine operating conditions and those related to the geometrical and physical characteristics of the piston assembly components. The engine-operation related factors are the speed, load and combustion delay [5][6][7] with the engine speed being the most significant factor amongst them. The impact force increases as the engine speed increases, whilst piston impact noise is rather insensitive to load at higher engine speeds [5,6].…”

Section: S Theodossiades Cnd-17-1339mentioning

confidence: 99%

“…The engine-operation related factors are the speed, load and combustion delay [5][6][7] with the engine speed being the most significant factor amongst them. The impact force increases as the engine speed increases, whilst piston impact noise is rather insensitive to load at higher engine speeds [5,6]. Combustion delay results in greater contact forces, as the connecting rod is at an angle with respect to the cylinder axis when the peak pressure takes place [7].…”

Section: S Theodossiades Cnd-17-1339mentioning

confidence: 99%

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Design Optimization Study of a Nonlinear Energy Absorber for Internal Combustion Engine Pistons

Dolatabadi

Theodossiades

Rothberg

2018

Journal of Computational and Nonlinear Dynamics

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Piston impacts against the cylinder liner are the most significant sources of mechanical noise in internal combustion (IC) engines. Traditionally, the severity of impacts is reduced through the modification of physical and geometrical characteristics of components in the piston assembly. These methods effectively reduce power losses at certain engine operating conditions. Frictional losses and piston impact noise are inversely proportional. Hence, the reduction in power loss leads to louder piston impact noise. An alternative method that is robust to fluctuations in the engine operating conditions is anticipated to improve the engine's noise, vibration and harshness (NVH) performance, while exacerbation in power loss remains within the limits of conventional methods. The concept of targeted energy transfer (TET) through the use of nonlinear energy sink (NES) is relatively new and its application in automotive powertrains has not been demonstrated yet. In this paper, a TET device is conceptually designed and optimized through a series of parametric studies. The dynamic response and power loss of a piston model equipped with this nonlinear energy sink is investigated. Numerical studies have shown a potential in reducing the severity of impact dynamics by controlling the piston's secondary motion.

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