27-08-2014, 03:04 PM
When we think of suspension system, all that comes to mind is the comfort of passenger. But that is not all, its only a secondary objective of a suspension system. The major objective is control of the vehicle during braking, acceleration, cornering etc. The vehicle must maintain contact with the road surface at all time ideally. Also, vibrations due to road excitations and noise must be isolated from the passenger compartment. This poses a problem because to fully absorb the impact due to a ditch or a bump, all of the reaction forces acting on the wheel passing the obstacle must be collinear to the spring force offered by shocker. In other words, the vector sum of all the reaction forces action on the wheel and the spring force must be zero. But in conventional suspension systems the degree of freedom of a suspension system is one. Therefore, it is impossible for it to absorb all the shock loadings. Thus, it is necessary to increase the degree of freedom of the suspension system to more than one and preferably, two. This way it is possible for a suspension system to absorb loads f