Hemanth, H.Shamanth, S.Devaraj, D.Kumar, H.Gangadharan, K.V.2026-02-052021International Journal of Vehicle Performance, 2021, 7, 46054, pp. 21-4017453194https://doi.org/10.1504/IJVP.2021.113411https://idr.nitk.ac.in/handle/123456789/23471This paper presents an investigation on the ride comfort and road-holding performance of a vehicle equipped with the semi-active suspension system. The full car semi-active suspension model with 7 degrees of freedom (7 DOF) system is adopted for the study and a fuzzy-logic control strategy is considered for minimising the effect of road disturbance on vehicle performance. The responses of a vehicle have been analysed under the Indian average random road profile (ISO8608) against the conventional passive suspension system. The performance of the semi-active suspension system is evaluated by heave, roll and pitch acceleration of the vehicle body around its centre of gravity. The performance of a vehicle with the semi-active suspension system has been compared with the response conventional passive suspension system. The result specifies that, the semi-active suspension system with a fuzzy-logic controller reduces around 43% of vibration amplitude at the resonance frequency of vehicle than the passive suspension system. © © 2021 Inderscience Enterprises Ltd.Active suspension systemsAutomobile suspensionsComputer circuitsDegrees of freedom (mechanics)Fuzzy controlFuzzy logicGravitationModel automobilesRoad vehiclesRoads and streetsVehicle performanceVibrations (mechanical)Dynamic behavioursFuzzy logic controlFuzzy logic controllersPassive suspension systemResonance frequenciesSemi active suspensionSemi-active suspension systemsVibration amplitudeSuspensions (components)