Measuring power output by modified prony brake

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SUMMARY

The discussion centers on measuring power output from a water wheel using a modified Prony brake method. The user connects a pulley system from the water wheel to a DC motor, controlled by a potentiometer acting as a brake. The calculated power output using this method is lower than that obtained from the traditional Prony brake method, raising concerns about potential calculation errors or mechanical losses in the pulley system.

PREREQUISITES
  • Understanding of Prony brake theory and calculations
  • Familiarity with DC motor operation and control using potentiometers
  • Knowledge of mechanical systems and potential losses in pulley configurations
  • Basic skills in power measurement techniques
NEXT STEPS
  • Research the principles of the Prony brake method for accurate power measurements
  • Explore methods to minimize mechanical losses in pulley systems
  • Investigate the impact of potentiometer settings on braking efficiency
  • Learn about alternative power measurement techniques for water wheels
USEFUL FOR

Engineers, hobbyists, and researchers involved in mechanical systems, power measurement, and renewable energy projects, particularly those focusing on water wheel applications.

Helmizar
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Hi guys

I have problem, basically I want to measure the power output from a water wheel.
so basically I measured the power output by connecting the pulley that attach on the shaft of the water wheel. then this pulley is connected to other pulley which sit on the shaft of the DC motor.
this DC motor is braking by using potentiometer as controller (which act as brake to the wheel). may be much more easy to see the drawing http://www.thescienceforum.com/images/smilies/smile.png
currently I calculate the power output by using method as shown in the attachment. but when I compared it with prony brake method, the power output is smaller than prony brake method. I get confuse now, is there any suggestion regarding my equation, probably something wrong with my calculation method
Helmizar
 

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Could it just be due to mechanical losses in the pulley system?
 

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