Crank train concept design and balancing of an internal-combustion engine for range extending of an electric vehicle

This paper presents the motivation for a range extender engine development because in comparison to power train of an electric vehicle equipped only by high-voltage battery, cost and mass saves should be reached depending on required vehicle range. The engine concept is supposed to be based on the cylinder unit of the standard ŠKODA AUTO three-cylinder engine. In order to meet power requirements and demands on costs and simplicity, the in-line two-cylinder layout is chosen for range extender. Six variants of the crank train layout are designed and compared considering mainly their balancing and vibration

Rheological models of high viscosity silicone fluids

High viscosity silicone fluids are utilized in multiple technical applications. Viscous type dampers of torsional vibrations are widely used in the field of internal combustion engines. Thin layers of high viscosity silicone oils, exposed to an oscillating shear stress, show both damping and elastic properties which are frequency and temperature dependent. This paper focuses on the issues to determine rheological models of the silicone fluids which may be utilized to create complex dynamic models of powertrains with dynamic torsional vibration dampers

Torsional analysis of the engine computational model

The paper deals with basic behaviour and torsional analysis of the engine computational model. This computational model is assembled from own blocks which are created using the basic elements of Simulink software. The paper describes individual blocks and whole assembly of the engine computational model. The simulation of this diesel model was done to verify its function. In conclusion, torsional analysis was carried out

Truck vibrations caused by unbalanced rotating shaft

This article presents an analysis of vibrations in drivetrain of an 8x8 truck caused by an unbalanced rotating drive shaft. This truck is also used in military and fire sphere. The aim was to reduce the vibrations affecting the drivers, therefore, a transient computational model for analysis of drivetrain shaft deflection was created in Matlab software. This model was compared to the simulation of the transient behaviour of a drivetrain shaft 3D model with the use of FEM. To verify the computational models, measurements of the rotating shaft deflection and directional oscillations on the truck driveline were carried out in the original version and then also with the designed modifications of the components. The conclusion presents the interpretation of the results

Analyses of truck powertrain torque and vibration

The article deals with an analysis of the mean value of the torque of the truck with 8x8 drive. Torque was measured using a noncontact device on the powertrain shaft. This shaft is used to drive the first front axle. For a better understanding of the experiment results, computational model of the truck was developed in Simulink software. To build the computational model, custom library was used and users could create different modifications of vehicles. Subsequently, analysis of torsional vibration was carried out. In the first study, the truck showed problems with directional vibrations and noise after reaching a certain speed, therefore, this article also continues with an analysis of the torsional vibration.

HIL TESTING OF THE MECHATRONIC SYSTEM IN LABORATORY CONDITIONS

Tento článek se zabývá laboratorním testováním snímačů a akčních členů u mechtronického systému určeného pro automatické uzavírání diferenciálu. Jeho řídicí algoritmus je implementován na hardware pro HIL testování. Je sledována reakce sestaveného mechatronického systému na reálné snímače a v závěru jsou zobrazeny výsledky z real-time testování k ověření správné reakce akčního členů.Tento článek se zabývá laboratorním testováním snímačů a akčních členů u mechtronického systému určeného pro automatické uzavírání diferenciálu. Jeho řídicí algoritmus je implementován na hardware pro HIL testování. Je sledována reakce sestaveného mechatronického systému na reálné snímače a v závěru jsou zobrazeny výsledky z real-time testování k ověření správné reakce akčního členů

Truck vibrations caused by rotating shaft deflection

The article deals with the creation of a transient computational model of rotating shaft deflection. This model is used for analysis of vibrations in the truck powertrain with an 8x8 drive. This vehicle is intended for military or fire purposes. However, issues with powertrain vibrations after reaching a certain vehicle speed appear. It was assumed that it was caused by the revolutions of the powertrain shaft and its deflection. Therefore, the aim is to reduce the vibrations affecting the drive comfort and prepare a computational model of the shaft. The transient computational model was created in Matlab software and compared with the results of a second model with the use of the finite element method. The second computational model works as a control version for the first model. The verification was carried out with the use of measurement of shaft deflection and directional vibrations on the powertrain. The conclusion shows the results of the comparison between the old and the new version of powertrain where vibrations were reduced