The mass of the vehicle is divided to unsprung and sprung mass. In addition to the contribution to the total weight, the unsprung mass also influences the response of the suspension. Smaller unsprung mass equals to better responsiveness of the suspension, which will contribute to better adaption to the irregularities of the driving surface. The more uniform distribution of normal load on the tire results in better grip of the vehicle, and furthermore, in improved driving characteristics. In order to improve the results in dynamic trials of Formula Student University of Ljubljana, we developed a lightweight aluminum core of a carbon fiber rim. After calculating the load on the rim, we prepared a three-dimensional model for the tire, carbon fiber coating and aluminium alloy rims in the Solidworks software tool. Next we performed a numerical analysis of the initial version of the lightweight aluminium core. Depending on the obtained results of the load response, the construction was adjusted and a re-numerical analysis was carried out. We preformed several iterations of numerical analyzes and adjustments. As a consequence, the final result is an aluminium core that transfers the load of extreme maneuvers of the formula while it weighs 50% less than the previous version.
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