Minimally intrusive torsional vibration sensing on rotating shafts

Martin Wesley Trethewey, Mitchell S. Lebold, Mark W. Turner

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Time Interval Measurement System (TIMS) is a common torsional vibration sensing method used for rotating equipment. The technique uses high-speed counters to detect "zero crossings" in a carrier signal that is generated by a multiple pulse per revolution encoder on the shaft. The "zero crossings" are based on the passage timing of discrete intervals from an incremental geometric encoder (i.e., gear, optical encoder) on a rotating shaft. A variety of transducers have been used to sense the encoder interval passages, including Hall effect and reflective light intensity transducers. The encoder and sensor require physical attachment to the rotating shaft and surrounding hardware. Furthermore, the combinations must work in concert with each other. Usually the sensing transducer requires precise positioning with respect to the shaft encoder. The physical attachment and installation of the encoding and sensing devices can range from problematic to extremely difficult depending on the application. To make sensing of torsional vibration on a rotating shaft easier and minimally intrusive a combination of an adhesive backed "zebra" tape and a specially modified laser tachometer is used. The laser tachometer is considerably easier as permits a greater range of standoff, targeting and mounting options. Tests are performed a on mechanical diagnostics test bed with a 30 hp electrical drive connected to a 70 hp load motor by a shaft and couplers to demonstrate the issues. Torsional vibration measurements are acquired with the laser tachometer-"zebra" tape, Hall effect-gear and a precision optical encoder. Results are presented and discussed from the various torsional vibration sensing systems. The application illustrates the ease of set up for the laser tachometer-"zebra tape" combination and the high data quality that can be obtained.

    Original languageEnglish (US)
    Title of host publicationStructural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010
    Pages207-212
    Number of pages6
    Volume3
    EditionPART 1
    StatePublished - Aug 15 2011
    Event28th IMAC, A Conference on Structural Dynamics, 2010 - Jacksonville, FL, United States
    Duration: Feb 1 2010Feb 4 2010

    Other

    Other28th IMAC, A Conference on Structural Dynamics, 2010
    CountryUnited States
    CityJacksonville, FL
    Period2/1/102/4/10

    Fingerprint

    Tachometers
    Tapes
    Transducers
    Lasers
    Hall effect
    Gears
    Vibration measurement
    Time measurement
    Mountings
    Adhesives
    Hardware
    Sensors

    All Science Journal Classification (ASJC) codes

    • Engineering(all)
    • Computational Mechanics
    • Mechanical Engineering

    Cite this

    Trethewey, M. W., Lebold, M. S., & Turner, M. W. (2011). Minimally intrusive torsional vibration sensing on rotating shafts. In Structural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010 (PART 1 ed., Vol. 3, pp. 207-212)
    Trethewey, Martin Wesley ; Lebold, Mitchell S. ; Turner, Mark W. / Minimally intrusive torsional vibration sensing on rotating shafts. Structural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010. Vol. 3 PART 1. ed. 2011. pp. 207-212
    @inproceedings{1c7b6020b95d4f56906fa8e2080730e5,
    title = "Minimally intrusive torsional vibration sensing on rotating shafts",
    abstract = "Time Interval Measurement System (TIMS) is a common torsional vibration sensing method used for rotating equipment. The technique uses high-speed counters to detect {"}zero crossings{"} in a carrier signal that is generated by a multiple pulse per revolution encoder on the shaft. The {"}zero crossings{"} are based on the passage timing of discrete intervals from an incremental geometric encoder (i.e., gear, optical encoder) on a rotating shaft. A variety of transducers have been used to sense the encoder interval passages, including Hall effect and reflective light intensity transducers. The encoder and sensor require physical attachment to the rotating shaft and surrounding hardware. Furthermore, the combinations must work in concert with each other. Usually the sensing transducer requires precise positioning with respect to the shaft encoder. The physical attachment and installation of the encoding and sensing devices can range from problematic to extremely difficult depending on the application. To make sensing of torsional vibration on a rotating shaft easier and minimally intrusive a combination of an adhesive backed {"}zebra{"} tape and a specially modified laser tachometer is used. The laser tachometer is considerably easier as permits a greater range of standoff, targeting and mounting options. Tests are performed a on mechanical diagnostics test bed with a 30 hp electrical drive connected to a 70 hp load motor by a shaft and couplers to demonstrate the issues. Torsional vibration measurements are acquired with the laser tachometer-{"}zebra{"} tape, Hall effect-gear and a precision optical encoder. Results are presented and discussed from the various torsional vibration sensing systems. The application illustrates the ease of set up for the laser tachometer-{"}zebra tape{"} combination and the high data quality that can be obtained.",
    author = "Trethewey, {Martin Wesley} and Lebold, {Mitchell S.} and Turner, {Mark W.}",
    year = "2011",
    month = "8",
    day = "15",
    language = "English (US)",
    isbn = "9781441998330",
    volume = "3",
    pages = "207--212",
    booktitle = "Structural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010",
    edition = "PART 1",

    }

    Trethewey, MW, Lebold, MS & Turner, MW 2011, Minimally intrusive torsional vibration sensing on rotating shafts. in Structural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010. PART 1 edn, vol. 3, pp. 207-212, 28th IMAC, A Conference on Structural Dynamics, 2010, Jacksonville, FL, United States, 2/1/10.

    Minimally intrusive torsional vibration sensing on rotating shafts. / Trethewey, Martin Wesley; Lebold, Mitchell S.; Turner, Mark W.

    Structural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010. Vol. 3 PART 1. ed. 2011. p. 207-212.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    TY - GEN

    T1 - Minimally intrusive torsional vibration sensing on rotating shafts

    AU - Trethewey, Martin Wesley

    AU - Lebold, Mitchell S.

    AU - Turner, Mark W.

    PY - 2011/8/15

    Y1 - 2011/8/15

    N2 - Time Interval Measurement System (TIMS) is a common torsional vibration sensing method used for rotating equipment. The technique uses high-speed counters to detect "zero crossings" in a carrier signal that is generated by a multiple pulse per revolution encoder on the shaft. The "zero crossings" are based on the passage timing of discrete intervals from an incremental geometric encoder (i.e., gear, optical encoder) on a rotating shaft. A variety of transducers have been used to sense the encoder interval passages, including Hall effect and reflective light intensity transducers. The encoder and sensor require physical attachment to the rotating shaft and surrounding hardware. Furthermore, the combinations must work in concert with each other. Usually the sensing transducer requires precise positioning with respect to the shaft encoder. The physical attachment and installation of the encoding and sensing devices can range from problematic to extremely difficult depending on the application. To make sensing of torsional vibration on a rotating shaft easier and minimally intrusive a combination of an adhesive backed "zebra" tape and a specially modified laser tachometer is used. The laser tachometer is considerably easier as permits a greater range of standoff, targeting and mounting options. Tests are performed a on mechanical diagnostics test bed with a 30 hp electrical drive connected to a 70 hp load motor by a shaft and couplers to demonstrate the issues. Torsional vibration measurements are acquired with the laser tachometer-"zebra" tape, Hall effect-gear and a precision optical encoder. Results are presented and discussed from the various torsional vibration sensing systems. The application illustrates the ease of set up for the laser tachometer-"zebra tape" combination and the high data quality that can be obtained.

    AB - Time Interval Measurement System (TIMS) is a common torsional vibration sensing method used for rotating equipment. The technique uses high-speed counters to detect "zero crossings" in a carrier signal that is generated by a multiple pulse per revolution encoder on the shaft. The "zero crossings" are based on the passage timing of discrete intervals from an incremental geometric encoder (i.e., gear, optical encoder) on a rotating shaft. A variety of transducers have been used to sense the encoder interval passages, including Hall effect and reflective light intensity transducers. The encoder and sensor require physical attachment to the rotating shaft and surrounding hardware. Furthermore, the combinations must work in concert with each other. Usually the sensing transducer requires precise positioning with respect to the shaft encoder. The physical attachment and installation of the encoding and sensing devices can range from problematic to extremely difficult depending on the application. To make sensing of torsional vibration on a rotating shaft easier and minimally intrusive a combination of an adhesive backed "zebra" tape and a specially modified laser tachometer is used. The laser tachometer is considerably easier as permits a greater range of standoff, targeting and mounting options. Tests are performed a on mechanical diagnostics test bed with a 30 hp electrical drive connected to a 70 hp load motor by a shaft and couplers to demonstrate the issues. Torsional vibration measurements are acquired with the laser tachometer-"zebra" tape, Hall effect-gear and a precision optical encoder. Results are presented and discussed from the various torsional vibration sensing systems. The application illustrates the ease of set up for the laser tachometer-"zebra tape" combination and the high data quality that can be obtained.

    UR - http://www.scopus.com/inward/record.url?scp=80051499207&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=80051499207&partnerID=8YFLogxK

    M3 - Conference contribution

    AN - SCOPUS:80051499207

    SN - 9781441998330

    VL - 3

    SP - 207

    EP - 212

    BT - Structural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010

    ER -

    Trethewey MW, Lebold MS, Turner MW. Minimally intrusive torsional vibration sensing on rotating shafts. In Structural Dynamics - Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010. PART 1 ed. Vol. 3. 2011. p. 207-212