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Physics of Stationary and Dynamic Ergometers

Physics of Stationary and Dynamic Ergometers. By: Nathaniel Brown Tim Beauregard Andrew DiOrio Bryan Taylor. Ergometer Background. E xercise machine that measures work done pulling a chain. U sed to simulate the motion of rowing a boat on water.

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Physics of Stationary and Dynamic Ergometers

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  1. Physics of Stationary and Dynamic Ergometers By: Nathaniel Brown Tim Beauregard Andrew DiOrio Bryan Taylor

  2. Ergometer Background • Exercise machine that measures work done pulling a chain. • Used to simulate the motion of rowing a boat on water. • Different types of ergs = different feel and performance.

  3. Static Ergometer Static: Concept2 Ergometer Diagram of Static Ergometer • The standard for testing a rower’s power output. • Does not mimic the feeling of a boat well.

  4. Dynamic Ergometer Dynamic: Oartec Slider Ergometer Diagram of Oartec Slider • Better mimics the motion of a boat. • Times are generally faster than stationary. • Higher stroke rates are easier.

  5. Problem Statement • Develop an explanation for differences in measured performance for different ergometers. • Create a “rule-of-thumb” formula for adjusting scores on different ergometers.

  6. Approach to Problem Solving • Measure locations of selected points on rower and erg using video and image tracking. • Find accelerations based on data. • Use the accelerations and masses to find work and power.

  7. Assumptions • Forces only act in x-direction. • Static center of masses based on three points at the ankle, hip, and neck. • Frictionless environment.

  8. Expectations • Static ergometer will waste more energy accelerating masses than the dynamic ergometer. • The dynamic ergometer will simulate motion on water better than the static ergometer.

  9. Equipment • 1 Ortec Slider Ergometer • 1 Stationary 2 Concept Ergometer • Video Camera • Image Tracking Software (Tracker) • Matlab

  10. Tracker • Open source • Tracks motion of points using image recognition algorithms • Exported Data into csv files

  11. Dynamic Erg with Tracker

  12. Procedure • Four, one minute pieces on each type of erg • Two pieces at 20 spm, two at 30 spm • Approximately even splits for each stroke rate (1:52 for 20 spm, 1:37 for 30 spm)

  13. Results

  14. Results (Cont.)

  15. Results (Cont.) • Rule of thumb: Static wastes 5 more watts for every beat above 16 spm.

  16. Conclusion • The dynamic erg is more efficient than the static erg. • The efficiency gap increases with an increase in stroke rating. • The efficiency gap has a significant effect on performance.

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