Isolator composite design, experimental and numerical analysis for wheel with tire

The importance of wheel works in the developing automobile sector is rapidly increasing. The issue of noise and vibration, which has been examined on wheels, has been researched for years, and improvement studies that can provide solutions are carried out. Until today, in different boundary conditions, with or without tire studies were carried out with experimental, numerical and different analytical solution methods. Within these researches, each of the vibrations created by the wheels with/without tires, and the compressed air were investigated with different methods and boundary conditions. As a result of the vibrations examined, it has been tried to create solutions to improve alternative designs that will absorb the vibration and noise. In this thesis, experimental and numerical vibration and modal analyzes of the electric vehicle rim of the Solaris 10 electric vehicle in different boundary conditions, with and without tires, are presented. First of all, the modal test of the tireless rim was carried out experimentally with a force hammer in free-free boundary conditions and compared with the modal analysis results obtained in the ANSYS-Modal Analysis package program. Afterwards, the real boundary conditions of the Solaris 10 electric vehicle were applied on the rim, and the modal test of the centrally connected tireless rim was performed with a force hammer and compared with the results obtained in the pre-loaded ANSYS-Modal Analysis package program. After providing the correlation, in the next step, vibration analysis of the tire rim in free-free boundary conditions was carried out experimentally with a force hammer, and natural frequency and mode structures were experimentally obtained. In the next step, the cavity resonance was determined experimentally with tire and centrally connected boundary conditions, then compared with the results obtained in the ANSYS- Modal Acustics package program. The correlation of the natural frequencies of the cavity resonance was provided. In order to isolate the cavity resonance, sandwich composite designs with different hole sizes, suitable for the rim surface of the rim, were made. The designs were analyzed in the ANSYS-Harmonic Acoustic package program, and the transmission loss value was determined for each design. In the designs, the transmission loss rates obtained depending on the different hole sizes were compared and among the results, 4 hole designs of 1 mm with the best transmission coefficient were selected. Afterwards, the selected perforated sandwich composite with the best transmission coefficient was produced. Before glue the sandwich composite, the tire rim was forced with a shaker, and the sound intensity was measured with a microphone, and then the measurements were taken on the rim and tire with an accelerometer. After the sandwich composite was produced, 4 holes of 1 mm diameter were drilled on it, and it was adhered to the rim with DP420. After the perforated sandwich composite was adhered, the sound intensity and acceleration measurements of the composite rim were taken with the same method experimentally. As a result, it has been shown that the acceleration and noise caused by the cavity resonance are reduced thanks to the sandwich composite design.