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The aim of this study is the modelling and analysis of a Hydro-Pneumatic (HP) suspension system interconnected for load sharing in heavy vehicles. The aim of the interconnected HP suspension system is to equalize the load of the suspension units of the axles in axle group(s) of multi-axle heavy vehicles. For the heavy vehicle systems with three and more axles, equalization of the suspension forces of the axle group(s) is a necessity to protect both the road and the vehicle. A single vehicle unit with three and more axles forms a statically indeterminate problem and the loads carried by each axle depend on the deformation of the axles and the suspension travel. For certain road inputs, some axle loads may become excessive. In this study, the nonlinear mathematical model of a heavy vehicle with interconnected load sharing HP suspension system is derived and the linearized version of the nonlinear model is obtained. Transfer functions of the vehicle system are obtained for frequency response analyses to assess the performance and to carry out a parametric analysis. Simulations are performed using speed bump input and random road inputs. A parametric study is performed to examine the effects of the conductor size connecting the HP suspension units on the load sharing performance.
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