Analysis of Transient Vibrations for Estimating Bolted Joint Tightness

  • M. BrønsEmail author
  • J. J. Thomsen
  • S. M. Sah
  • D. Tcherniak
  • A. Fidlin
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


It is difficult to determine and control the tension level in a bolt; however, there is a great need for that to ensure safe operation of large structures. Bolts come in all sizes, but when properly tightened a bolt can roughly be considered an axially stressed clamped-clamped beam. A novel technique is proposed to quantify the level of bolt tightness by analysing natural frequencies and damping ratios of the bolt, based on simple hammer impacts. To study the application potential of the technique a set of real bolted joints, holding together machinery parts for a fluid mechanic setup, are impulse hammer impacted and the vibration response analysed. The tests aim to capture obstacles induced by working with bolts outside a controlled laboratory.


Bolted joints Tension estimation Transient vibrations Signal processing Practical application 



This work is financially supported by the Danish Council for Independent Research, grant DFF-6111-00385.


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Copyright information

© Society for Experimental Mechanics, Inc. 2020

Authors and Affiliations

  • M. Brøns
    • 1
    Email author
  • J. J. Thomsen
    • 1
  • S. M. Sah
    • 1
  • D. Tcherniak
    • 2
  • A. Fidlin
    • 3
  1. 1.Department of Mechanical EngineeringTechnical University of DenmarkKgs. LyngbyDenmark
  2. 2.Brüel and Kjær Sound and Vibration Measurements A/SNærumDenmark
  3. 3.Institute of Engineering MechanicsKarlsruhe Institute of TechnologyKarlsruheGermany

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