Faculty Publications

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Publications by NITK Faculty

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Author: search.filters.author.Gangadharan, K.V.Subject: search.filters.subject.Comparative studies

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    Dynamic analysis of half car model with MR damper as semi-active suspension element
    (International Institute of Acoustics and Vibrations P O Box 13 Auburn AL 36831, 2018) Hemanth, K.; Kumar, H.; Gangadharan, K.V.
    This paper presents the dynamic analysis of a half-car model with a magnetorheological (MR) damper subjected to random excitation. Experimental studies have been conducted to predict the behavior of the prototype twin-tube MR damper. The mathematical model of the prototype MR damper has been proposed by using the Bouc-Wen model. The half-car model with the MR damper has been used to predict the ride comfort and road holding performance. Comparative studies between the half-car model with the passive and semi-active suspension system with a proportional-integral-derivative (PID) control shows that the MR damper suspension system offers a good performance. © 2018 International Institute of Acoustics and Vibrations. All Rights Reserved.
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    A comparative study on the effectiveness of system parameters in monitoring pre-load loss in bolted joints
    (Springer Verlag service@springer.de, 2018) Anginthaya, K.; Kuchibhatla, S.A.R.; Gangadharan, K.V.; Kishan, A.
    This article presents the monitoring of bolt loosening in a single bolted lap joint between two steel beams. The bolt loosening is initially studied using system modal parameters for various boundary conditions. Natural frequency and modal damping ratio in lower modes were not found to be reliable. Transmissibility function was seen to have a more reliable trend to identify the state of the joint. An in-house setup was developed to produce loosening in the bolted joint. Testing configuration was optimized by structural analysis. Strain measurements were carried out using Fiber Bragg-grating sensors while sinusoidal load was applied on the test structure. The results have been used to discuss a viable approach to identify the health of, or recognize a loosening trend, in a bolted joint. © 2018, The Brazilian Society of Mechanical Sciences and Engineering.