1.1 Research Purpose:

Suspension is one of the important assemblies on modern cars thatelastically connect the frame (or body) to the axle (or wheel). While its maintask is to transmit all the forces and moments acting between the wheel and theframe (or the body), it has multiple other purposes to serve such as; tomitigate the impact load transmitted by the road to the frame (or the body), toattenuate the vibration of the Chassis caused by the car, and to ensure thecar's smooth ride; to ensure that the wheel has ideal motion characteristicswhen the road is uneven and the load changes and to ensure the steeringstability of the car, so that the car can obtain high-speed driving ability[1].

In this research, a rear torsion beam suspension will be designed for DongFeng Peugeot 308 sedan using the given design parameters with the focus on;

· mastering theunderstanding of assembly and function of the suspension system

· designing and analyzingthe components of the suspension system

· understanding theiteration of all the system components in detail

· analyzing for thenatural frequencies of system vibrations

· analyzing fordeflections in the suspension system under both the static as well as dynamicconditions

· elastic characteristicsof the suspension

1.2 Significance