Akademik Veri Yönetim Sistemi
3th International Mediterranean Congress, Mersin, Türkiye, 17 - 18 Nisan 2023, ss.582-602
Vibration in vehicles is an important issue that should be considered because road excitation forces on automobiles create random vibrations that affect the comfort of passengers. These forces from the road create vibration and noise in the vehicle. In this study, modal analysis was carried out by means of the finite element method, considering the heavy commercial vehicle chassis design. A computer-aided design program was used in the chassis design. Aluminum (6061T6), ultra-high strength steel (UHSS), and Hardox 500 steel were chosen as the chassis material. First, static analysis was applied to the chassis design in the finite element analysis program ANSYS. Then, three different materials were defined for the design, and a modal analysis was performed. By performing modal analysis on the chassis, natural frequencies in various modes are observed in the low-frequency vibration of different materials, and then the corresponding displacements are compared. After the structural analysis, the equivalent stress and deformation values for all three materials are given in the results. The static analysis results showed that the least deformation was obtained with 1.96 mm in the chassis using Hardox 500 steel. When the equivalent stresses were compared, the chassis design using Hardox steel had the lowest stress value of 163.78 MPa. As a result of the modal analysis, the chassis using UHSS material reached the natural frequency of 19.78 Hz first, while the chassis design using Hardox 500 steel reached the last with 20.01 Hz. The chassis design that reached the highest frequency was the chassis using Hardox steel with 39.1 Hz, while the amount of deformation in this mode was 5.11 mm. The chassis using aluminum material has 1.27% less final frequency value (38.61 Hz) compared to the chassis using Hardox material, while the amount of deformation (9.11mm) has increased 1.82 times compared to the chassis using Hardox material. Considering that all three materials used in the chassis show the highest deformation value at the highest frequency values, Hardox 500 steel material stands out by being different from the other two materials with the lowest deformation displayed at this high frequency