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 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 Experimental study of an internal combustion engine fueled by a low-calorific value producer gas

2022 ◽  
Vol 2150 (1) ◽  
pp. 012015
Author(s):  
G I Nikitina ◽  
A N Kozlov ◽  
M V Penzik
Keyword(s):  
Experimental Study ◽  
Steady State ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Calorific Value ◽  
Operating Mode ◽  
Internal Combustion ◽  
Variable Load ◽  
Producer Gas ◽  
Steady State Operation

Abstract This paper describes an experimental study of the operation of an internal combustion engine of fueled by a low-calorific value gas. The main operating parameters of low-power ICE were determined. Efficiency was also evaluated when the ICE was converted to operate on producer gas. In the experiment, it was shown that the engine reached a stable operating mode under load and data on the temperature and exhaust gases composition were obtained. According to our estimates, in the steady-state operation of the internal combustion engine with a load, the efficiency factor was about 22 %. When using the model gas, the from generator output power, was about 30-40 % of the nominal value, under variable load conditions. However, it was found that in steady-state operation, the power of the internal combustion engine was 40-55% of the nominal value.

scholarly journals Numerical continuation applied to internal combustion engine models

2020 ◽  
Vol 234 (14) ◽  
pp. 3458-3475
Author(s):  
Shaun Smith ◽  
James Knowles ◽  
Byron Mason
Keyword(s):  
Steady State ◽  
Internal Combustion Engine ◽  
Parameter Space ◽  
Bifurcation Analysis ◽  
Combustion Engine ◽  
State Parameter ◽  
Internal Combustion ◽  
Numerical Continuation ◽  
Data Driven ◽  
Engine Model

This paper proposes tools from bifurcation theory, specifically numerical continuation, as a complementary method for efficiently mapping the state-parameter space of an internal combustion engine model. Numerical continuation allows a steady-state engine response to be traced directly through the state-parameter space, under the simultaneous variation of one or more model parameters. By applying this approach to two nonlinear engine models (a physics-based model and a data-driven model), this work determines how input parameters ‘throttle position’ and ‘desired load torque’ affect the engine’s dynamics. Performing a bifurcation analysis allows the model’s parameter space to be divided into regions of different qualitative types of the dynamic behaviour, with the identified bifurcations shown to correspond to key physical properties of the system in the physics-based model: minimum throttle angles required for steady-state operation of the engine are indicated by fold bifurcations; regions containing self-sustaining oscillations are bounded by supercritical Hopf bifurcations. The bifurcation analysis of a data-driven engine model shows how numerical continuation could be used to evaluate the efficacy of data-driven models.

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