Cylinder Liner Deformation Analysis - Measurements and Calculations

Koch, Franz; Decker, P. L.; Gülpen, Robert; Quadflieg, Franz-Josef; Loeprecht, Malte

doi:10.4271/980567

Cited by 25 publications

(19 citation statements)

References 1 publication

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“…First, it is important to mitigate thermal deformations, which, according to Hitosugi et al 45 and Koch et al 46 are crucial at higher engine speeds at the top dead centre reversal. To avoid the aforementioned effects, this particular test engine was operated at low speeds and temperatures along the cylinder block, which were controlled using a speed controller and an air-conditioning device.…”

Section: Methods Of Friction Measurementmentioning

confidence: 99%

“…Experiments have shown that the thermal strain of the aluminium cylinder is approximately 21-24 m strain/°C. 46 Therefore, the gauge set-up ensures that reflections on the liner are responsible for the piston assembly contact. It should be noted that the strain gauge was properly mounted on the test specimen so that the strain was accurately transferred from the test specimen to the foil itself, despite the adhesive and strain gauge backing.…”

Section: Calibration Of Strain Gaugementioning

confidence: 99%

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Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

Zavos

Nikolakopoulos

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents a thorough experimental study of piston assembly friction and noise in a single-cylinder motorbike engine operating at low speeds. The friction of the piston ring pack is evaluated using a foil strain gauge with minimal cylinder modification on the thrust side. The technique involves transmitting deformations through the cylinder bore and recording reflections from the lubricated interface as the piston assembly passes. Under these conditions, the piston side forces and the thermal deformations on the output side of the strain gauge sensor are critical. Therefore, the proposed methodology is designed under controlled operating conditions. The overall deformation of the piston assembly is analysed to measure the primary reflection due to friction between the piston assembly and the cylinder wall. Simultaneously, the piston assembly noise is recorded on the thrust side of the engine block using a microphone. Taking measured noise data into account, possible piston slap events resulting from varied engine speeds are taken into account using continuous wavelet signal analysis. The calibration procedure for both tests is also illustrated. The measured friction results show that the strain gauge technique is a challenging work in providing realistic results to enhance current technology. For low engine speeds, a higher contribution is noted by boundary friction at the top dead centre reversal, extending to the position of maximum combustion pressure in the power stroke. Furthermore, the main contribution of the piston slap is estimated at the thrust side when the piston assembly passes at the beginning of the combustion stroke. These results can also be attributed as data to validate piston ring models in terms of friction and piston slap.

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Section: Methods Of Friction Measurementmentioning

confidence: 99%

Section: Calibration Of Strain Gaugementioning

confidence: 99%

Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

Zavos

Nikolakopoulos

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The zeroth order describes the round bore, the first order describes the eccentric bore, the second order describes the oval bore, third order describes the three-lobe-shaped bore, and the fourth order describes the four-lobe-shaped bore. Generally, the first four deformation orders dominate the total liner deformation, while the higher orders deformations are commonly neglected [13].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Only few published works have discussed the enhancement of the PRCL conformation through the increase of the shape accuracy in the fired state. Increasing the roundness of the deformed liner in the fired state provides a significant opportunity for improving the PRCL performance [12,13]. The authors of [14] studied the performance of initially noncircular liners numerically.…”

Section: Introductionmentioning

confidence: 99%

“…This includes manufacturing inaccuracies, the assembly process, thermal expansion variations between different engine components, temperature gradients during the fired state, and mechanical load during fired operations [16,17]. More than 85% of the accumulated deformation in the liner is referred to the operational mechanical and thermal loads [13]. The shape, the way, and the value of this deformation, in both longitudinal and radial directions, must have a great influence on any design improvement.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study

et al. 2020

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Reducing friction is an important aspect to increase the efficiency of internal combustion engines (ICE). The majority of frictional losses in engines are related to both the piston skirt and piston ring–cylinder liner (PRCL) arrangement. We studied the enhancement of the conformation of the PRCL arrangement based on the assumption that a suitable conical liner in its cold state may deform into a liner with nearly straight parallel walls in the fired state due to the impact of mechanical and thermal stresses. Combining the initially conical shape with a noncircular cross section will bring the liner even closer to the perfect cylindrical shape in the fired state. Hence, a significant friction reduction can be expected. For the investigation, the numerical method was first developed to simulate the liner deformation with advanced finite element methods. This was validated with given experimental data of the deformation for a gasoline engine in its fired state. In the next step, initially conically and/or elliptically shaped liners were investigated for their deformation between the cold and fired state. It was found that, for liners being both conical and elliptical in their cold state, a significant increase of straightness, parallelism, and roundness was reached in the fired state. The combined elliptical-conical liner led to a reduced straightness error by more than 50% compared to the cylindrical liner. The parallelism error was reduced by 60% to 70% and the roundness error was reduced between 70% and 80% at different liner positions. These numerical results show interesting potential for the friction reduction in the piston-liner arrangement within internal combustion engines.

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Experimental thermal analysis of cylinder block and head of a bi-fuel turbocharged engine

Ghorbanian¹,

Ahmadi²

2012

Meccanica

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Cylinder Liner Deformation Analysis - Measurements and Calculations

Cited by 25 publications

References 1 publication

Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

Measurement of friction and noise from piston assembly of a single-cylinder motorbike engine at realistic speeds

Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study

Experimental thermal analysis of cylinder block and head of a bi-fuel turbocharged engine

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