Identification of the optimal parameters of the torsional vibration damper of the internal combustion engine crankshaft for normal power settings

Engine crankshaft driving by the starter is characterised as a diagnostic process. The article discusses the working conditions of the electric starter when driving the engine crankshaft in terms of the equilibrium of the engine resistance torque and the moment of force generated by starting system. The resistance sources in the internal combustion engine were characterized and factors influencing them were discussed, its components and dependencies allowing for their determination were indicated. The variability of the engine resistance torque in the cycle of its operation as well as the variability of the torque and rotational speed of the crankshaft in the process of propelling the shaft are indicated. The stand and the methodology for testing the engine's internal combustion engine and the influence of the temperature and power of the starting system on registered start signals are presented. The cause and effect relationships of the engine resistance torque and the features – parameters of the starting system operation were indicated. It was shown that the values of signals recorded during the crankshaft driving have the features of engine diagnostic parameters in the aspect of the combustion chamber tightness and the total resistance of the internal combustion engine.

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The Effect of the Damping of the Throws on the Torsional Vibration of the Crankshaft System of an Internal Combustion Engine

Journal of the Royal Aeronautical Society ◽

10.1017/s0368393100138635 ◽

1929 ◽

Vol 33 (227) ◽

pp. 1086-1087

Author(s):

J. Morris

Keyword(s):

Internal Combustion Engine ◽

Torsional Vibration ◽

Combustion Engine ◽

Internal Combustion ◽

Moment Of Inertia ◽

Torsional Stiffness ◽

Direct Drive ◽

Polar Moment ◽

R Ratio ◽

Image Position

In the Journal for October, 1923, I gave the following formulæ for the frequencies in torsional vibration of the crankshaft system (see Fig. 1) of a direct drive engine having equal throws and equal journals, viz.:—1and2where3c=torsional stiffness (the CI/L) of an “equivalent journal”;p=polar moment of inertia of the “equivalent pulley” of a throw;r=ratio of the torsional stiffness of the shaft between the airscrew and the first “ equivalent pulley,” to that of an “ equivalent journal “;n=number of throws.

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Multi-objective optimization design of engine crankshaft bearing

Industrial Lubrication and Tribology ◽

10.1108/ilt-03-2015-0040 ◽

2016 ◽

Vol 68 (1) ◽

pp. 86-91 ◽

Cited By ~ 6

Author(s):

Jun Sun ◽

Lei Shu ◽

Xianhao Song ◽

Guangsheng Liu ◽

Feng Xu ◽

...

Keyword(s):

Internal Combustion Engine ◽

Power Loss ◽

Optimization Design ◽

Combustion Engine ◽

Internal Combustion ◽

Multi Objective Optimization ◽

Content Type ◽

Multi Objective ◽

Engine Crankshaft ◽

Bearing System

Purpose – This paper aims to use the crankshaft-bearing system of a four-cylinder internal combustion engine as the studying object, and develop a multi-objective optimization design of the crankshaft-bearing. In the current optimization design of engine crankshaft-bearing, only the crankshaft-bearing was considered as the studying object. However, the corresponding relations of major structure dimensions exist between the crankshaft and the crankshaft-bearing in internal combustion engine, and there are the interaction effects between the crankshaft and the crankshaft-bearing during the operation of internal combustion engine. Design/methodology/approach – The crankshaft mass and the total frictional power loss of crankshaft-bearing s are selected as the objective functions in the optimization design of crankshaft-bearing. The Particle Swarm Optimization algorithm based on the idea of decreasing strategy of inertia weight with the exponential type is used in the optimization calculation. Findings – The total frictional power loss of crankshaft-bearing and the crankshaft mass are decreased, respectively, by 26.2 and 5.3 per cent by the multi-objective optimization design of crankshaft-bearing, which are more reasonable than the ones of single-objective optimization design in which only the crankshaft-bearing is considered as the studying object. Originality/value – The crankshaft-bearing system of a four-cylinder internal combustion engine is taken as the studying object, and the multi-objective optimization design of crankshaft-bearing based on the crankshaft-bearing system is developed. The results of this paper are helpful to the design of the crankshaft-bearing for engine. There is universal significance to research the multi-objective optimization design of crankshaft-bearing based on the crankshaft-bearing system. The research method of the multi-objective optimization design of crankshaft-bearing based on the crankshaft-bearing system can be used to the optimization design of the bearing in the shaft-bearing system of ordinary machinery.

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