Calculating Torque for Rotating Beam

AI Thread Summary
To calculate the starting and stopping torque for a uniformly laden beam weighing 200kg and measuring 2200mm in length, one must consider the motion dynamics involved in rotating the beam through 70 degrees in 4 seconds, with acceleration and deceleration times of 0.5 seconds each. A velocity-time diagram can be utilized to determine the top speed and average velocity, which will help in calculating the required acceleration. This acceleration is crucial for deriving the necessary torque to initiate and halt the beam's motion. Understanding concepts such as torque, moments of inertia, and angular accelerations is essential for solving this problem effectively. The calculation is deemed straightforward for those familiar with these principles.
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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