Forces on a Pulley Shaft: Calculating Shear Forces and Power Requirements

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SUMMARY

This discussion focuses on calculating shear forces on a pulley shaft connected to an alternator. The driver pulley has a diameter of 160mm, while the driven pulley measures 140mm. The system operates with the driver pulley at 1050 RPM and the driven pulley at 1200 RPM, delivering 7 KW of power to the alternator. Key calculations involve determining torque based on power and angular velocity, and understanding the relationship between torque and shear stress through torsion theory.

PREREQUISITES
  • Understanding of basic mechanics, specifically torque and shear stress.
  • Familiarity with pulley systems and belt drive configurations.
  • Knowledge of angular velocity calculations and their implications.
  • Basic principles of torsion theory in mechanical engineering.
NEXT STEPS
  • Calculate torque on the pulley shaft using the formula: Torque = Power / Angular Velocity.
  • Explore the relationship between torque and shear stress in the context of torsion theory.
  • Research methods for calculating shear forces in rotating shafts.
  • Investigate the effects of pulley diameter and RPM on system efficiency and performance.
USEFUL FOR

Mechanical engineers, students studying mechanics, and professionals involved in designing or analyzing pulley systems and power transmission mechanisms.

joe888
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Hi i need help calculating the shear forces on a pulley shaft. The pulley of the shaft drives another pulley conected to an alternator. the driver pulley is 160mm in diameter, the driven pulley on the alternator is 140mm. The distance between the pulleys is 664mm and the belt length is 1800mm. The speed of the driven pulley is 1200 RPM and the driver is 1050 RPM. The power to the alternator is 7 KW. Any help with where to begin would be appreciated thanks.
 
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joe888 said:
Hi i need help calculating the shear forces on a pulley shaft. The pulley of the shaft drives another pulley conected to an alternator. the driver pulley is 160mm in diameter, the driven pulley on the alternator is 140mm. The distance between the pulleys is 664mm and the belt length is 1800mm. The speed of the driven pulley is 1200 RPM and the driver is 1050 RPM. The power to the alternator is 7 KW. Any help with where to begin would be appreciated thanks.

With the power to the alternator and the velocity (angular) of the driven shaft, what is the torque on the shaft?

How does torque relate to shear stress? (Hint: think about torsion theory)
 

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