No abstract

Vehicle active suspension systems (VASS) are designed to improve ride comfort and road handling capacity in the automotive industry. This paper investigates the problem of vibration suppression in full car model (FCM) with active suspension system (ASS) whose aim is to reduce the effect of the vibrations generated by road irregularities on the human body. The mathematical model is developed for seven degrees of freedom (DOF) FCM. The main objective is to control vibration of FCM for various road disturbances such as bump and random road disturbance using a fractional order sliding mode controller (FOSMC) and sliding mode controller (SMC). The effectiveness of the controllers are validated using MATLAB/Simulink software in terms of root mean square (RMS) values of body acceleration (BA), pitch acceleration (PA) and roll acceleration (RA). Further the power spectrum density (PSD) of BA is considered to show the human sensitivity range. The simulation results are indicated that FOSMC shows superior performance at adapting bump and random road disturbances compared to SMC and passive suspension system (PSS).

The ride quality and travel comfort of the passenger is based on the type of the suspension system used in the vehicle. The active suspension system is one of the good choices to reduce the vibration and enhance the travel comfort. In this study, a quarter car with integrated seat suspension and driver model (QCSD) is considered for analysis. The controllers are designed for both single actuator (SA) and dual actuator (DA). To reduce the vibration and increase the travel comfort, different types of sliding mode controllers (SMCs) such as fuzzy SMC (FSMC), fractional order SMC and fractional order FSMC (FrFSMC) are designed and simulated in the active suspension system of the QCSD. Three types of road disturbances are used to stimulate the vibration in the system. The responses of the controllers with the QCSD are compared with the passive system and existing state feedback controller. The result shows that the FrFSMC performs better than the other controllers for DA as well as SA. While comparing the DA and SA, DA performs better than SA.

No abstract

No abstract