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Journal Article

Electric Vehicle Energy Consumption Simulation by Modeling the Efficiency of Driveline Components

2016-04-11
2016-01-9016
The feasibility of improving the energy efficiency of Electric Vehicles (EV) by manipulating operation points by means of a variable transmission is investigated with an efficient mathematical model of power losses in all driveline components. Introduced model can be solved in real-time making it possible to embed it to a control scheme of EV. Empirical test results are employed to derive the efficiency of the power electronics and electric motor at operation points while the mechanical power losses are predicted by a comprehensive and generic formulation for efficiency analysis. The simulation model used comprises electrical component efficiency, drivetrain inertias, gearbox efficiency, regenerative braking, and gear ratio selection. Three different transmission types are studied in this work; a single reduction gear, a five-step gearbox and an Infinitely Variable Transmission.
Technical Paper

Some Aspects on Modeling of the Moving Forest Machines

2000-09-11
2000-01-2629
This paper concentrates on some important aspects, restrictions and problems that should be considered when modelling off-highway vehicles. The main modelling interest is focused on log forwarder machines, see Figure 1 but indicated principles are easily generalize to the other kind of vehicles and machines. The mechanics, hydraulics, hydrostatic propelling system with control system, tire-road-interaction and system interaction were modelled by using ADAMS® (Automatic Dynamic Analysis of Mechanical Systems, ADAMS is a registered trademark of Mechanical Dynamics, Inc.) dynamic simulation software. Also the modelling of flexible parts with lumped-mass approach and assumed modes methods are discussed. The matters are examined mainly from the point of view of modelling techniques with the ADAMS dynamic simulation software.
Technical Paper

Simulation of the Forwarder Dynamics

1999-09-14
1999-01-2783
This paper describes the development of a virtual prototype of a log forwarder using ADAMS dynamic system simulation software. The mechanics, hydraulics, hydrostatic propelling system with control system, tire-road-interaction and system interaction was modeled by using ADAMS. Also the flexibility of the boom mechanism was modeled. The virtual model was then verified with several different tests on actual hardware. This investigation concentrated on the simulation of forwarder dynamics, particularly in situations when the forwarder was moving. Firstly the virtual model performed a maneuver, in which the forwarder drove over small bump on the road at different speeds and loads. The same test was then performed with an actual forwarder, instrumented with acceleration sensors, placed on the bogie axles and a tachometer mounted on the propeller shaft to measure shaft rotational speed. Relatively good correspondence between measured and simulated results was achieved.
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