چكيده به لاتين
Today, hybrid vehicles accounted for a considerable part of the car market and it is predicted that sales of this vehicle will reach about 30 percent of the total car sales until 2020. Even though lot of researches have been done on the control, efficiency and fuel consumption of HEV’s powertrain system, dynamic performance have been less considered. In order to evaluate the performance of vehicle dynamics, modeling and simulation of the car and analysis of the results from the viewpoints of ride comfort and handling are required.
In this thesis, modeling and simulation of PHEV’s ride comfort as one of the most important dynamic specifications is considered. As the road is the main factor affecting vibration and discomfort of passengers and is also noted as the input for the simulation, in the first step, the acceleration of a measuring mechanism and response to road irregularities was recorded by accelerometers attached to the mechanism. The longitudinal road profile was then extracted using the mathematical model of the mechanism which results in studying the road roughness more precisely.
In the next step in order to study effects of hybridization on vehicle vibration specifications, dynamic model of PHEV including all important subsystems shuch as suspension system, chassis, body and other systems was established in Adams/Car software then the effects on vibration properties and ride comfort was investigated based on standard indexes. The results indicate that the vehicle bounce responses to road profile have been improved however pitch and roll responses show reduction in ride comfort for PHEV but since the ride comfort index is more affected by vertical acceleration, this index has been improved for PHEV compared to regular car.
