Rollover Optimization and Ride Comfort Verification of Four-Wheeler Bajaj Qute

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Addis Ababa University


Bajaj qute is four-wheeler type of bajaj which is categorized under small utility vehicles (LTV). In our country (Ethiopia) Bajaj qutes are the main transportation system in transport industry. Passenger cars had the lowest rollover fatality rate (23 percent of fatalities were in vehicles that rolled over), while SUVs had the highest, 59 percent. Clearly, rollover crashes are a major safety problem for all classes of light vehicles, particularly LTVs. Except on static stability factor (SSF) approach for the analysis, there is no enough research paper which worked particularly on rollover propensity of Bajaj qute. SSF ignored the effect of suspension system. In reality vehicle suspension allowed for significant movements of wheels with respect to the body. And it had significant effect on lateral behavior of bajaj qute. The lateral forces are transmitted between the body and the wheels by rigid suspension arms. The suspension arm should also be analyzed by FEA to ensure that the part is strong enough to with stand the applied loads. In addition, varying the rollover behavior of a car could have an effect on ride comfort behavior of the passenger occupant. It is needed to verify the effect on ride comfort behavior of Bajaj After the rollover behavior of the car is changed. The whole suspension system of bajaj qute was modelled in ANSYS and ADAMS/CAR for structural and dynamic analysis respectively. The part with worst loading was selected for structural analysis to ensure that the part is strong enough to with stand the load applied. For dynamic analysis, the full vehicle was modelled for roll over analysis. Hence, both suspension system and full vehicles are optimized by ADAMS/INSIGHT for suspension parameter and rollover respectively. Sprung mass RMs values for different bajaj qute speeds were calculated to check ride comfort behavior of original and optimized model. From the structural analysis the lower control arm was strong enough to with stand the load applied. Furthermore, the analysis showed that the arm carries extra strength which takes us to additional weight. So that, topology optimization is done with constant fatigue life. Using topology optimization, the mass of the vehicle was reduced and resulted in to reduction of carbon emission of Bajaj qute by 1.4%. using the rollover optimization, the fishhook speed of car was increased from 50km/hr to 60km/hr. Ride comfort analysis showed that, even if both the original and optimized models are within the standard limit, the optimized model was more comfortable for the passenger occupant than the original one. Finally, as a conclusion, suspension systems parameters had invaluable effect on the lateral behavior of car.



Bajaj qute, rollover, ADAMS/CAR, Ride comfort, SSF, ADAMS/INSIGHT