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4 4 Reaction R, is partially transferred to the semi trailer chassis by hanger bracket 1, force F W, and by pneumatic air spring 4, force F S. The kinematics and characteristic values for the suspension were determined based on the data provided by suspension and axle manufacturer SAF [3]. The X dimension describes the distance between the wheel center and the bottom of the chassis, and X S is the height of the working area of the air spring. Relation between these values is described by the equation (1): L X S = 1 L + L 1 X The pneumatic airbag SAF 619V [3] was considered. The unitary pressure per 1 N of loading for airbag is: (1) p J =.7 Pa/N () Basing on the unitary pressure () the effective area A E (3) was determined A E 1 F = = p p The volume V 0 in the air spring relating to the initial conditions was determined based on the effective area A E corrected by additional volume in neutral space. π D VO = AE xso + 4 J where: x SO the height of working area in the air spring related to the initial conditions. The initial pressure in the air spring P S0 was determined basing on the initial volume V 0 and the initial impact force on air spring F S0 coming from the weight of the semi-trailer: p S0 Z S S A E x SO (3) (4) FS 0 = (5) A Force F S was determined by suspension kinematics and reaction R coming from the contact of the wheel with the ground: F S L = L+ L 1 E ( R m ) (6) where: m NR unsprung mass including tires, wheels, suspension and axle. Force F S was the base for the determination of the correlation between pressure in the airbag and loading of axle R, the correlation is described by equation (7). The pressure is designated for two airbags working on one axle. This correlation corresponds to the constant volume of the airbag and constant height from the axle to the chassis bottom: p NR L ( R ) = R m p ( L L ) ( ) (7) + S NR J 1

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