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A novel pendulum test for measuring roller chain efficiency

Research output: Contribution to journalArticle

Original languageEnglish
Article number075008
Number of pages12
JournalMeasurement Science and Technology
Issue number7
Early online date29 May 2018
DateAccepted/In press - 15 Dec 2017
DateE-pub ahead of print - 29 May 2018
DatePublished (current) - Jul 2018


This paper describes a novel pendulum decay test for determining the
transmission efficiency of chain drives. The test involves releasing a pendulum with an initial potential energy and measuring its decaying oscillations, under controlled conditions the decay reveals the losses in the transmission to a high degree of accuracy. The main advantage over motorised rigs is that there are significantly fewer sources of friction and inertia and hence measurement error. The pendulum rigs have an accuracy around 0.6% for the measurement of coefficient of friction, giving an accuracy of transmission efficiency measurement around 0.012%. A theoretical model of chain friction combined with the equations of motion enables coefficient of friction to be
determined from the decay rate of pendulum velocity. The pendulum rigs operate at relatively low speeds. However, they allow an accurate determination of the coefficient of friction to estimate transmission efficiency at higher speeds. The pendulum rig revealed a previously undetected rocking behaviour in the chain links at very small articulation angles. In this regime, the link interfaces were observed to roll against one another rather than slide. This observation indicates that a very high efficiency transmission can be achieved if the articulation angle is very low.

    Research areas

  • Transmission efficiency, Pendulum, Measurement, Friction losses

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via IOP at . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document


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