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Experimental Investigations: Dynamic Analysis of a Beam Under the Moving Mass to Characterize the Crack Presence

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Abstract

Background

Investigation of the bridge and vehicle interaction problem received an extreme significance due to difficulty of solving the resulted equations, involvement of various parameters such as velocity, mass, traffic intensity, road roughness. The effect of velocity of vehicle on the dynamic response is a key issue in these problems.

Purpose

The objective of this study is to evaluate the theoretical results with the experimental results. The displacement and acceleration responses are compared for healthy as well as for damaged beam. A discontinuity present in the response provides the basis for continuous evaluation method for identifying the crack presence and its location.

Methods

The problem of dynamic excitation caused by vehicles moving on a bridge is investigated by developing a small scale Lab-model. A beam simply supported is considered as bridge and vehicle is modeled by a moving mass. The mid-span displacement and acceleration response of the simply supported beam are recorded using the CDAQ-card of National Instruments and signal analysis is done with LABVIEW software.

Results

It is found that with velocity of mass increasing, vibration amplitude increases but transient fluctuation reduces. A slight shift in the maxima of the response towards right is also observed with increase in velocity. The response is also investigated in presence of crack and it is observed that the amplitude of maxima increases due to crack.

Conclusion

The results of experiments are evaluated with simulated theoretical results and it is concluded that presence of crack and its location can be effectively identified using acceleration response. A close estimate is found in the response values of simulated and experimental for the damaged beam subjected to moving mass.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India

    Animesh Chatterjee & Tanuja Vaidya

Authors
  1. Animesh Chatterjee
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  2. Tanuja Vaidya
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Correspondence to Tanuja Vaidya.

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Chatterjee, A., Vaidya, T. Experimental Investigations: Dynamic Analysis of a Beam Under the Moving Mass to Characterize the Crack Presence. J. Vib. Eng. Technol. 7, 217–226 (2019). https://doi.org/10.1007/s42417-019-00114-3

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  • DOI: https://doi.org/10.1007/s42417-019-00114-3

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