Faculty Publications

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Author: search.filters.author.Kuchibhatla, S.A.R.

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    Sensor Fusion for Operational Mode Shape Analysis of Multi DoF Systems
    (Elsevier Ltd, 2018) Rahul, R.; Rajpal, R.; Kuchibhatla, S.A.R.; Gangadharan, K.V.
    This paper presents an experimental approach to study the dynamic behavior of a multi DOF system by sensor fusion technique. An experimental model is designed and developed to simulate real dynamic problem. Frequency response function (FRF) is obtained by conducting impact hammer test from which natural frequencies of the system are identified. Mode shapes are analyzed using forced vibration test at selected frequency zones. This study illustrates the benefits of using sensor fusion for the study of behavior of complex dynamic systems. © 2018 Elsevier Ltd.
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    Parametric Modeling and Real Time Remote Experimentation of a Reconfigurable Coupled Pendulum
    (Elsevier Ltd, 2018) Rajpal, R.; Kant, M.; Kuchibhatla, S.A.R.; Gangadharan, K.V.
    This paper presents parametric modeling and real time remote experimentation of a reconfigurable coupled pendulum on a data flow visual programming platform - G Programming. The motivation behind creating the experiment was to make it virtually available for e-learning in the field of vibration analysis & diagnostics. The derived math models replicated the low frequency system dynamics and were used in simulations to highlight inherent system behaviour. Finally, experiment was conducted for various system configuration settings characterized by pre-set discrete lengths of the pendulums. Sensors and actuators used for the experimentation were integrated using LabVIEW. Smartphone and Cross-Platform Communication Toolkit (SCCT) was employed to establish communication between remote user and Master computer. The experiment highlighted bimodal dynamic behaviour of the system in individual and combined modes of vibration through an Internet based remote experimentation platform. © 2018 Elsevier Ltd.
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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.
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    Performance of magnetorheological elastomer based torsional vibration isolation system for dynamic loading conditions; ??????????????????????????
    (Central South University of Technology f-ysxb@mail.csut.edu.cn, 2020) Shenoy, S.K.; Kuchibhatla, S.A.R.; Singh, A.K.; Gangadharan, K.V.
    Vibration isolation is an effective method to mitigate unwanted disturbances arising from dynamic loading conditions. With smart materials as suitable substitutes, the conventional passive isolators have attained attributes of semi-active as well as the active control system. In the present study, the non-homogenous field-dependent isolation capabilities of the magnetorheological elastomer are explored under torsional vibrations. Torsional natural frequency was measured using the serial arrangement of accelerometers. Novel methods are introduced to evaluate the torsional stiffness variations of the isolator for a semi-definite and a motor-coupled rotor system. For the semi-definite system, the isolation effect was studied using the frequency response functions from the modal analysis. The speed-dependent variations for motor-coupled rotor system were assessed using the shift in frequency amplitudes from torque transducers. Finite element method magnetics was used to study the variations in the non-homogenous magnetic field across the elastomer. The response functions for the semi-definite rotor system reveal a shift in the frequency in the effect of the magnetic field. Speed-dependent variations in the frequency domain indicate an increment of 9% in the resonant frequency of the system. © 2020, Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature.