Calculating Torque for Rotating Beam

In summary, the conversation discusses the calculation of starting and stopping torque for rotating a 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, stopped, and then reversed. This motion is to be repeated continuously with a total time of 4 seconds and acceleration and deceleration achieved in 0.5 seconds each. The conversation also mentions the use of a velocity-time diagram to determine top speed and average velocity, as well as the need for knowledge of torques, moments of inertia, and angular accelerations to solve the problem.
  • #1
Doug Harvey
1
0
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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  • #2
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.
 
  • #3
@Doug Harvey : As Simon suggests this is not a difficult problem to solve .

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

FAQ: Calculating Torque for Rotating Beam

1. How do you calculate torque for a rotating beam?

To calculate torque for a rotating beam, you need to know the force acting on the beam and the distance from the pivot point to the point where the force is applied. The formula for torque is T = F x d, where T is torque, F is force, and d is the perpendicular distance from the pivot point to the point where the force is applied.

2. What is the unit of torque?

The unit of torque is Newton-meters (Nm) in the SI system of units. In the imperial system of units, the unit of torque is pound-feet (lb-ft).

3. How does the angle of the applied force affect the torque?

The angle of the applied force affects the torque by changing the direction of the force vector relative to the pivot point. The larger the angle between the force vector and the lever arm (perpendicular distance from the pivot point), the smaller the torque will be.

4. Can the direction of the torque be changed?

Yes, the direction of the torque can be changed by changing the direction of the applied force or by changing the direction of the lever arm. For example, if the force is applied perpendicular to the lever arm, the torque will be in the same direction as the force. However, if the force is applied at an angle to the lever arm, the torque will be in a different direction.

5. What is the significance of the moment of inertia in torque calculations?

The moment of inertia is a measure of an object's resistance to rotational motion. In torque calculations, the moment of inertia is used to determine how much force is needed to accelerate a rotating object. The larger the moment of inertia, the more force is needed to produce the same amount of torque and rotational acceleration.

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