Abstract
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.
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.
| Original language | English |
|---|---|
| Article number | 075008 |
| Number of pages | 12 |
| Journal | Measurement Science and Technology |
| Volume | 29 |
| Issue number | 7 |
| Early online date | 29 May 2018 |
| DOIs | |
| Publication status | Published - Jul 2018 |
Keywords
- Transmission efficiency
- Pendulum
- Measurement
- Friction losses
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Profiles
Professor Stuart C Burgess
- Department of Mechanical Engineering - Professor of Engineering Design
- Bristol Robotics Laboratory
- Systems Centre
Person: Academic , Member
Dr Jason M Yon
- Department of Mechanical Engineering - Lecturer in Electromechanical Systems
- Electrical Energy Management
Person: Academic , Member
Cite this
Wragge-Morley, R., Yon, J., Lock, R., Alexander, B., & Burgess, S. (2018). A novel pendulum test for measuring roller chain efficiency. Measurement Science and Technology, 29(7), [075008]. https://doi.org/10.1088/1361-6501/aaa239