Laboratory for Dynamics of Machines and Structures 
Damping heat coefficient – Theoretical and experimental research on a vibrating beam
 M. Mihalec, J. Javh, F. Cianetti, M. Moretti, G. Rossi, J. Slavič and M. Boltežar
Journal of Sound and Vibration, Volume 400, 21 July 2017, Pages 13–21

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Abstract
Vibrating systems dissipate their vibrational energy through different mechanisms, commonly referred to as damping. Damping converts the vibrational energy into other forms, such as heat and sound radiation. Heating of the material is often assumed to be one of the biggest drains of energy; however, the measurable temperature increase is at the level of milli Kelvin and hard to measure. This research introduces a damping heat coefficient, the coefficient of total dissipated energy that is converted into heat. Using this coefficient, the expected temperature change of a beam is theoretically related to its damping ratio. In addition, the damping heat coefficient is determined experimentally by measuring the temperature increase of a vibrating beam. Based on modal damping, it is shown that different amounts of energy are dissipated at different parts of the structure. The numerical heat model was experimentally confirmed.
Authors

Assistant

Marko Mihalec, PhD Student

  Rutgers, The State University of New Jersey
  marko.mihalec@rutgers.edu
  

Young researcher

Jaka Javh, PhD Student

  Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  jaka.javh@fs.uni-lj.si
  +386 1 4771 603

Associate Professor

Filippo Cianetti, PhD

  University of Perugia, Department of Engineering
  
  

Researcher

Michele Moretti, PhD

  University of Perugia, Department of Engineering
  
  

Professor

Gianluca Rossi, PhD

  University of Perugia, Department of Engineering
  
  

Associate Professor

Janko Slavič, PhD

  Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  janko.slavic@fs.uni-lj.si
  +386 1 4771 226
jankoslavic     jankoslavic    
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Professor

Miha Boltežar, PhD

  Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
  miha.boltezar@fs.uni-lj.si
  +386 1 4771 608
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