A new class of drill strings is investigated whereby strategically designed and placed periodic inserts are utilized to filter out the vibration transmission along the drill strings. Such mechanical filtering capabilities allow the vibrations to propagate along the periodic drill string only within specific frequency bands called the “pass bands” and completely block it within other frequency bands called the “stop bands.” The design and the location of the inserts are selected to confine the dominant modes of vibration of the drill string within the stop bands generated by the periodic arrangement of the inserts in order to completely block the propagation of the vibrations. A finite element model (FEM) that simulates the operation of this new class of drill strings is developed to describe the complex nature of the vibration encountered during drilling operations. Experimental prototype of the passive periodic drill string was built and tested to demonstrate the feasibility and effectiveness of the concept of periodic drill string in mitigating undesirable vibrations. The experimental results are used to validate the developed theoretical model and to develop a scalable design tool that can be used to predict the dynamical behavior of this new class of drill strings.
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April 2018
Research-Article
Band Gap Characteristics of Nonrotating Passive Periodic Drill String
Yaser Alsaffar,
Yaser Alsaffar
Mechanical Engineering Department,
University of Maryland,
College Park, MD 20742
e-mail: yaseralsaffar@gmail.com
University of Maryland,
College Park, MD 20742
e-mail: yaseralsaffar@gmail.com
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Sadok Sassi,
Sadok Sassi
Department of Mechanical and Industrial
Engineering,
Qatar University,
Doha 2713, Qatar
e-mail: sadok.sassi@qu.edu.qa
Engineering,
Qatar University,
Doha 2713, Qatar
e-mail: sadok.sassi@qu.edu.qa
Search for other works by this author on:
Amr Baz
Amr Baz
Professor
Mechanical Engineering Department,
University of Maryland,
College Park, MD 20742
e-mail: baz@umd.edu
Mechanical Engineering Department,
University of Maryland,
College Park, MD 20742
e-mail: baz@umd.edu
Search for other works by this author on:
Yaser Alsaffar
Mechanical Engineering Department,
University of Maryland,
College Park, MD 20742
e-mail: yaseralsaffar@gmail.com
University of Maryland,
College Park, MD 20742
e-mail: yaseralsaffar@gmail.com
Sadok Sassi
Department of Mechanical and Industrial
Engineering,
Qatar University,
Doha 2713, Qatar
e-mail: sadok.sassi@qu.edu.qa
Engineering,
Qatar University,
Doha 2713, Qatar
e-mail: sadok.sassi@qu.edu.qa
Amr Baz
Professor
Mechanical Engineering Department,
University of Maryland,
College Park, MD 20742
e-mail: baz@umd.edu
Mechanical Engineering Department,
University of Maryland,
College Park, MD 20742
e-mail: baz@umd.edu
1Corresponding author.
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received March 20, 2017; final manuscript received August 25, 2017; published online October 4, 2017. Assoc. Editor: Stefano Gonella.
J. Vib. Acoust. Apr 2018, 140(2): 021004 (12 pages)
Published Online: October 4, 2017
Article history
Received:
March 20, 2017
Revised:
August 25, 2017
Citation
Alsaffar, Y., Sassi, S., and Baz, A. (October 4, 2017). "Band Gap Characteristics of Nonrotating Passive Periodic Drill String." ASME. J. Vib. Acoust. April 2018; 140(2): 021004. https://doi.org/10.1115/1.4037851
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