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Dynamic Testing of a Pre-stretched Flexible Tube for Identifying the Factors Affecting Modal Parameter Estimation

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Abstract

Experimental modal analysis is the primary tool for obtaining the fundamental dynamic characteristics like natural frequency, mode shape and modal damping ratio that determine the behaviour of any structure under dynamic loading conditions. This paper discusses about a carefully designed experimental method for calculating the dynamic characteristics of a pre-stretched horizontal flexible tube made of polyurethane material. The factors that affect the modal parameter estimation like the application time of shaker excitation, pause time between successive excitation cycles, averaging and windowing of measured signal, as well as the precautions to be taken during the experiment are explained in detail. The modal parameter estimation is done using MEscopeVESTM software. A finite element based pre-stressed modal analysis of the flexible tube is also done using ANSYS ver.14.0 software. The experimental and analytical results agreed well. The proposed experimental methodology may be extended for carrying out the modal analysis of many flexible structures like inflatables, tires and membranes.

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Acknowledgments

This work was carried out in Advanced Dynamics and Control Laboratory of College of Engineering, Trivandrum Kerala, India and is supported by All India Council for Technical Education (RPS Grant No: 8023/RID/RPS-24/2011-12).

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Authors and Affiliations

  1. College of Engineering Trivandrum, Trivandrum, 695016, Kerala, India

    Madhusudanan Unnikrishnan, Akash Rajan, Binulal Basanthvihar Raghunathan & Jayaraj Kochupillai

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  1. Madhusudanan Unnikrishnan
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  2. Akash Rajan
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  3. Binulal Basanthvihar Raghunathan
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  4. Jayaraj Kochupillai
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Correspondence to Jayaraj Kochupillai.

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Unnikrishnan, M., Rajan, A., Basanthvihar Raghunathan, B. et al. Dynamic Testing of a Pre-stretched Flexible Tube for Identifying the Factors Affecting Modal Parameter Estimation. J. Inst. Eng. India Ser. C 98, 421–430 (2017). https://doi.org/10.1007/s40032-016-0306-1

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  • DOI: https://doi.org/10.1007/s40032-016-0306-1

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