Numerical Optimization of Ring-Pack Behavior

Ejakov, Mikhail A.; Diaz, Alfredo Peña; Schock, Harold

doi:10.4271/1999-01-1521

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…This quantity is used to predict the loss of energy of acoustic wave through the engine block structure. The structural attenuation ratio is the ratio of the acoustic power Pa divided by the force that vibrates the structure (impact power) Pv and is given by the equation (24). / = (24) According to Ungar and Ross [29] for aluminum cylinders this ratio equals 12•10 -5 .…”

Section: Compression Piston Ring Noisementioning

confidence: 99%

“…The structural attenuation ratio is the ratio of the acoustic power Pa divided by the force that vibrates the structure (impact power) Pv and is given by the equation (24). / = (24) According to Ungar and Ross [29] for aluminum cylinders this ratio equals 12•10 -5 . As structure's excitation power, the power produced by the friction losses is used since the friction is a cause of vibrations.…”

Section: Compression Piston Ring Noisementioning

confidence: 99%

“…As structure's excitation power, the power produced by the friction losses is used since the friction is a cause of vibrations. Therefore, the acoustic power is extracted from the solution of the equation (24). Then, the equation ( 25) is used, for the sound power level calculation, as follows:…”

Section: Compression Piston Ring Noisementioning

confidence: 99%

See 2 more Smart Citations

Performance Evaluation of Internal Combustion Engine Under Noise Measurements an Experimental and Analytical Procedure

Korkos¹,

Nikolakopoulos²

2020

Tribol. Ind.

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Section: Compression Piston Ring Noisementioning

confidence: 99%

Section: Compression Piston Ring Noisementioning

confidence: 99%

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Performance Evaluation of Internal Combustion Engine Under Noise Measurements an Experimental and Analytical Procedure

Korkos¹,

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Pistons

Kanungo¹

2014

Encyclopedia of Automotive Engineering

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Automobile engines have with time witnessed a favorable change with respect to fuel economy, passenger comfort, environment, and so on. The change continues with every manufacturer and researcher striving toward excellence. Pistons and their ring assembly are one of the important elements in whole engine assembly, which have metamorphosed to suit the current requirement. Improvements in design, geometry, and material have not only reduced the inertia forces but also increased the time interval between overhauls. The modification of piston crowns to introduce swirl by squish effect and material coating techniques have enhanced the features of a piston. In fact, engines today last their useful life without any significant maintenance other than renewal of oil and filters. Piston rings too have reduced in numbers and are designed to meet its functional requirement. The contents are essentially an overview and ode to the excellent work done by research teams and engine manufacturers worldwide, in optimizing the engine efficiency.

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The influence of blow-by on indicated work output from a diesel engine under cold start conditions

Cheng

Shayler

Murphy

2004

Proceedings of the Institution of Mechanical Engineers, Part D:

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The start-up time of automotive, light-duty diesel engines increases as ambient temperature falls. One contributory cause is a reduction in indicated work output. The in uence of blow-by in bringing about the reduction has been investigated. The experimental study was carried out at 20°C on four-cylinder direct injection (DI ) engines with a capacity of around 2 l. Blow-by losses were inferred from measurements of gas ow from the crankcase. Indicated mean e ective pressure was shown to decrease linearly with increasing blow-by rate. The relationship accounts for almost all the reduction in work output at low temperatures. The reduction is associated with the in uence of blow-by on heat released during combustion, rather than with the transport of enthalpy from the cylinder.

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Numerical Optimization of Ring-Pack Behavior

Cited by 6 publications

References 5 publications

Performance Evaluation of Internal Combustion Engine Under Noise Measurements an Experimental and Analytical Procedure

Performance Evaluation of Internal Combustion Engine Under Noise Measurements an Experimental and Analytical Procedure

Pistons

The influence of blow-by on indicated work output from a diesel engine under cold start conditions

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