Calculating Torque for Rotating Beam

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SUMMARY

The discussion focuses on calculating the starting and stopping torque required for a uniformly laden beam weighing 200kg, with a length of 2200mm, rotating around a fixed axis. The beam must rotate through 70 degrees in 4 seconds, with acceleration and deceleration phases of 0.5 seconds each. Participants suggest using a velocity-time diagram to determine top speed and average velocity, which are essential for calculating the necessary torque. Understanding torques, moments of inertia, and angular accelerations is crucial for solving this problem effectively.

PREREQUISITES
  • Understanding of torque and its calculation
  • Familiarity with moments of inertia
  • Knowledge of angular acceleration concepts
  • Ability to create and interpret velocity-time diagrams
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  • Research how to calculate torque for rotating objects
  • Learn about moments of inertia for various shapes
  • Study angular acceleration and its implications in mechanical systems
  • Explore the use of velocity-time diagrams in motion analysis
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Mechanical engineers, physics students, and anyone involved in the design and analysis of rotating systems, particularly those working with cranes or similar machinery.

Doug Harvey
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Can anyone help with calculating the starting and stopping torque required to rotate a uniformly laden beam with a total weight of 200kg around a fixed axis. The beam has a length of 2200mm and will be started from stationary, rotated through 70 degrees at which point it will stop and reverse. This motion to be repeated continuously. The total time to pass through 70 degrees is 4 seconds. Accelleration and de-celleration to be achieved in 0.5 second each. Looks similar to a cantilever jib crane.
 
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Certainly... it looks straight forward for boe calculation.
Start w a velocity-time diagram. You can find the top speed off that, and the average velocity for a single sweep.
This tells you the acceleration and thus the torque.
 
@Doug Harvey : As Simon suggests this is not a difficult problem to solve .

Are you familiar with torques , moments of inertia and angular accelerations ?
 

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