scholarly journals Steady State Unbalance Response Analysis of Internal Combustion Engine Crankshaft Based on Torsional Vibration

2021 ◽  
Vol 1820 (1) ◽  
pp. 012130
Author(s):  
Wang Lin ◽  
Ni Chen ◽  
YuBai Zhang
Keyword(s):  
Steady State ◽  
Internal Combustion Engine ◽  
Torsional Vibration ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Response Analysis ◽  
Unbalance Response ◽  
Engine Crankshaft

scholarly journals Rigid body dynamics and simulation of a three-cylinder, four-stroke internal combustion engine coupled with an aircraft propeller

2021 ◽  
Author(s):  
Scott A Warwick
Keyword(s):  
Steady State ◽  
Rigid Body ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Practical Interest ◽  
Internal Combustion ◽  
Rigid Body Dynamics ◽  
Propeller Shaft ◽  
Dynamical Behaviors ◽  
Body Dynamics

Dynamical behaviors of a system consisting of a Saito-450 3-cylinder, 4-stroke engine and a variable pitch propeller are studied. The kinemtical equations for the planar 8-bar internal combustion engine are established using a complex number method. The nonlinear dynamical equation for the engine-propeller system is obtained using the Lagrange equation and solved numerically using a computer code written in the Matlab language. Various simulations were performed to study the transient and steady state dynamical behaviors of the sophisticated multiple rigid body system while taking into account the engine pressure pulsations and aerodynamic load. The steady-state motions of the propeller shaft for different engine powers and speeds were obtained and decomposed using the Fast Fourier Technique (FFT). Results presented in this thesis provide necessary input for studies of flexible body dynamics where the torsional vibration of the propeller shaft is of practical interest to design engineers in the aerospace industry.

scholarly journals Towards Ecological Alternatives in Bearing Lubrication

Lubricants ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 62
Author(s):  
Bachir Bouchehit ◽  
Benyebka Bou-Saïd ◽  
John Tichy
Keyword(s):  
Steady State ◽  
Internal Combustion Engine ◽  
Combustion Product ◽  
Combustion Engine ◽  
Mechanical Energy ◽  
Internal Combustion ◽  
Journal Bearings ◽  
Technological Solution ◽  
Engine Systems ◽  
Global Parameters

Hydrogen is the cleanest fuel available because its combustion product is water. The internal combustion engine can, in principle and without significant modifications, run on hydrogen to produce mechanical energy. Regarding the technological solution leading to compact engines, a question to ask is the following: Can combustion engine systems be lubricated with hydrogen? In general, since many applications such as in turbomachines, is it possible to use the surrounding gas as a lubricant? In this paper, journal bearings global parameters are calculated and compared for steady state and dynamic conditions for different gas constituents such as air, pentafluoropropane, helium and hydrogen. Such a bearing may be promising as an ecological alternative to liquid lubrication.

scholarly journals Mechanical features of the combustion engine electric starting system

2018 ◽  
Vol 19 (6) ◽  
pp. 661-668
Author(s):  
Józef Pszczółkowski
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Diagnostic Process ◽  
Total Resistance ◽  
System Operation ◽  
Factors Influencing ◽  
Resistance Torque ◽  
The Moment ◽  
Engine Crankshaft

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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