Salehpour - Islamic Azad University, Anzali branch, Bandaranzali, Iran.
Jamali - Faculty of Mechanical engineering, The University of Guilan, Rasht, Iran.
Nariman-zadeh - Faculty of Mechanical engineering, The University of Guilan, Rasht, Iran.

In this paper, multi-objective uniform-diversity genetic algorithm (MUGA) with a diversity preserving mechanism called the ε-elimination algorithm is used for Pareto optimization of ۵-degree of freedom vehicle vibration model considering the five conflicting functions simultaneously. The important conflicting objective functions that have been considered in this work are, namely, vertical acceleration of seat, vertical velocity of forward tire, vertical velocity of rear tire, relative displacement between sprung mass and forward tire and relative displacement between sprung mass and rear tire. Further, different pairs of these objective functions have also been selected for ۲-objective optimization processes. The comparison of the obtained results with those in literature demonstrates the superiority of the results of this work. It is shown that the results of ۵-objective optimization include those of ۲-objective optimization and, therefore, provide more choices for optimal design of vehicle vibration model.