Faculty Publications
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Item Vertical dynamic analysis of a quarter car suspension system with MR damper(Springer Verlag service@springer.de, 2017) Hemanth, K.; Kumar, H.; Gangadharan, K.V.This paper presents ride comfort and road holding analysis of passive and semi-active suspension system using quarter car model. Semi-active suspension system with magnetorheological (MR) damper was modeled as non-parametric model-based magnetic flux density in the fluid flow gap. The skyhook control strategy was used to analyze semi-active control performance. The simulation of passive and semi-active suspension system was carried out under random road profile for different velocities. The result shows that semi-active suspension has significant improvement in terms of ride comfort and road holding of vehicle than passive suspension system. Experimental studies have been conducted to characterize MR damper and a good match is observed between results with simulation results obtained using non-parametric model. © 2016, The Brazilian Society of Mechanical Sciences and Engineering.Item Study the dynamic behaviour of seven DOF of full car model with semi-active suspension system(Inderscience Publishers, 2021) Hemanth, H.; Shamanth, S.; Devaraj, D.; Kumar, H.; Gangadharan, K.V.This 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.Item Characterization and quarter car analysis with magnetorheological fluid damper using modified algebraic model (mAlg)(Elsevier Ltd, 2022) Kumbhar, S.; Puneet, N.P.; Kumar, H.Magnetorheological (MR) dampers have received the ever-increasing attention of many researchers considering their wide range of applications ranging from large seismic control of structures to prosthetics in the medical field. One such application is in semi-active vehicle suspension with MR damper. Modeling the dynamic behavior of MR damper is an intriguing challenge and many mathematical models are put forth to address this task. In this work, the MR damper is initially developed and characterized using in-house prepared MR fluid. This study aims at using a modified algebraic model (mAlg) for modeling the hysteretic behavior of the MR damper using experimental force data. Also, the study uses a Genetic algorithm toolbox to find optimal parameters for the mAlg model, and the accuracy of mAlg is visualized with various plots. The work also aims at analyzing the response of the quarter car model with MR damper to three kinds of road excitations using Simulink. © 2022Item Design and development of MR damper for two wheeler application and Kwok model parameters tuning for designed damper(SAGE Publications Ltd, 2022) Devikiran, P.; Puneet, N.P.; Hegale, A.; Kumar, H.Magnetorheological dampers have been the interest of many researchers for a few decades for the reason of being an effective and rapidly progressing technology in the field of semi-active controlled suspension. The dynamic behaviour of these devices with nonlinear hysteresis is quite a complicated phenomenon. Hence, this paper aims at the design, modelling and simulation of a custom-made MR damper for a two-wheeler vehicle. The Kwok model has been chosen to mathematically model the MR damper. The model parameters have been optimised by minimizing the error difference between experimental and model-generated force results. A PID control is designed to control the damper effectively depending on the deflection of the damper. The two-wheeler vehicle modelled with four degrees of freedom is coupled with a mathematical model of MR damper in front and rear suspension. Further, the dynamic analysis has been performed in MATLAB/Simulink considering random road input for different velocities and current input conditions. The improved performance of MR damper was observed in suppressing road irregularities using a PID controller. As an implementation part of the work, the developed damper has been implemented in a two wheeler vehicle for performance evaluation at on-road testing conditions. The results showed significant improvement in damper performance with increment of constant current controlling MR dampers. © IMechE 2021.Item Real-time testing and thermal characterization of a cost-effective magneto-rheological (MR) damper for four-wheeler application(Springer Science and Business Media Deutschland GmbH, 2023) Jamadar, M.E.H.; Devikiran, P.; Desai, R.M.; Kumar, H.; Joladarashi, S.Recent studies show that the Magento-Rheological (MR) dampers can serve as a suitable replacement for passive dampers on ground vehicles. MR dampers are factory fitted in premium luxury vehicles. However, the high price of these MR dampers has restricted their use to premium vehicles only. The study presented in this article attempts to develop a MR damper, in collaboration with a shock absorber manufacturer, that can replace the existing passive dampers on a passenger van while being more affordable than the commercially available MR dampers. The developed MR damper is subjected to rigorous testing on the damper testing machine to evaluate its damping performance, reliability and thermal performance. The simulation results of the test vehicle model revealed a superior MR damper performance compared to the stock passive damper. The MR damper is later installed on the test vehicle to conduct real-time experiments. The real-time experiments showed that the developed MR damper improved the ride comfort of the test vehicle by 16.2% at 10 km/hr and by 17.6% at 20 km/hr compared to passive dampers while running over a speed bump. The road handling also improved by 14.32% at 10 km/hr and by 29.3% at 20 km/hr. At the end of the study, the cost evaluation performed on the developed MR damper revealed that it was more affordable than the commercially available MR dampers. © 2023, The Author(s), under exclusive licence to The Brazilian Society of Mechanical Sciences and Engineering.Item Optimization and experimental analysis of a cost-effective magneto-rheological (MR) fluid for application in semiactive suspension of a passenger van(SAGE Publications Ltd, 2024) Jamadar, M.E.H.; Devikiran, P.; Kumar, H.; Joladarashi, S.The study presented in this article attempts to determine the optimal composition of iron particles in the MR fluid for vehicular application based on the size of the particles, the simulation response of a test vehicle model, and the cost of the fluid. The MRF samples with two different-sized particles in varying compositions are prepared and characterized on a rheometer. The performance of each MRF sample in the semiactive suspension of a test vehicle is determined by simulating its full car model on a random road. The response of the vehicle model during simulation, the size of the particles, the volume fraction of the particles in the carrier fluid, and the fluid’s calculated cost are input for the Response surface optimization technique. The optimization results revealed that the MR fluid with large-sized particles in a 25% volume fraction would be suitable for the said application. Moreover, it was found that the rheological performance of the optimized MR fluid was better than the commercial MR fluid. The performance of the optimized fluid in a MR damper was experimentally evaluated against the stock passive damper of the test vehicle. The results of the experiment on the test vehicle showed that the MR damper improved the test vehicle’s ride comfort by 36.58% over a speed bump and 11.3% on an off-road test track. The road handling was also improved by 45% over a speed bump and 46% over the test track. © IMechE 2023.Item Performance evaluation of magneto-rheological damper with spring accumulator and on-road testing by implementing in a four wheeler vehicle(Springer, 2025) Puneet, N.P.; Devikiran, P.; Kumar, H.; Gangadharan, K.V.Passenger vehicles running over roads are undergoing speedy updates every now and then in terms of design, luxury and passenger expectations. Above all, a passenger expects greater comfort in a vehicle throughout the journey. In many possible ways, semi-active suspension systems are proving themselves as optimum choice between passive and active systems. The present study emphasizes the performance analysis of a class of semi-active systems called magneto-rheological (MR) dampers. An MR damper suitable for a specific four wheeler vehicle with McPherson suspension system is designed and developed with a spring accumulator. The MR damper thus developed has undergone characterization testing subjected to variable input excitation conditions. The MR fluid for this damper is prepared in the laboratory. Sky-hook and ground-hook controllers are used as the current controlling devices. The developed MR damper is then used in the suspension system of the front half of the four wheeler vehicle for on-road testing. The developed damper showed about 20% improvement in the ride comfort level when used with the control strategies. © Indian Academy of Sciences 2025.