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Notas:
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There is a large variety of multiple driven axle vehicles. Some of the most common are the 3-axle rigid vehicles
and the 4-axle articulated vehicles, which can in some cases have different steering mechanisms, adaptive suspension, etc.
This last kind of vehicles usually have very complex transmission configurations. Moreover, the required torques in each of
the wheels can be very different, especially when the vehicle is working in rough terrains. The aim of this work is to study
and model the driveline of this kind of vehicles, when using a hydrostatic transmission, from the performance and efficiency
point of view, by analysing the influence of the operating conditions in the transmission efficiency. A global model is used to
quantify the power flow in each of the transmission elements and the overall performance of the entire vehicle driveline, given
the operating conditions thereof. A sensitivity analysis has also been done showing the influence of vehicle speed, rolling
resistance, terrain slope and hydraulic motors displacement in the overall transmission efficiency. The interest of this work is
also to make a contribution to the literature in the field of global modelling of drivelines under variable operating conditions
and its application to ATVs. One important aspect is the influence of different actuation requirements that occur in different
wheels at the same time. The results show that the overall performance of the transmission is highly dependent on operating
conditions, on the selected transmission configuration and on the used components.
The authors would like to thank Generalitat de Catalunya for partially funding this work (project 2009-SGR-534). M. Comellas would like to thank Universitat de Lleida for his research fellowship. |
