چكيده به لاتين
In this thesis, the robust control of the hydraulic engine mount is examined in order to improve the NVH behavior for a vehicle. For this purpose, at first, the modeling of passive and semi-active hydraulic engine mount class equations was completed by considering comprehensive nonlinear conditions for accurate prediction of system behavior and their functional comparison with each other, along with their functional behavior. Then, in order to improve the Ride quality and comfortability of the car in different road conditions and the disturbances caused by the engine, according to their statistical and frequency characteristics, it has been studied. In addition, important factors have been identified in the magnetorheological engine mount in order to determine the effect of the new semi-active engine mount structure and its fluid and coil placement. Then, functional experimental tests were performed at different frequencies for the sample, applied, and the results were analyzed. The H (inf) robust controller was designed and implemented for a semi-active engine mount in half and full model of a car, so that the results of its behavior could be compared to inactive conditions. Finally, comparison and conclusion of the collected information data was performed and based on the obtained results, the proposal to use the H (inf) controller was evaluated. The results are given in both temporal and frequency spaces. The results show that despite the 40% uncertainty, the H (inf) controller performs well and its use leads to the transmission of less than 5% of the engine vibration frequency and effectively, reduces vibrations caused by system disturbances. (more than 50 decibels in a system designed compared to inactive engines)
