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Torque problem

Torque problem

Torque problem

(OP)
For a project we need to specify the torque required to uprighten a structure when rotated to a certain angle. The structure is located at a distance where the torque can be applied. However, I have no clue where to start. Can somebody help me solving this problem or giving me some guidance. I deliberately left out any variables/properties, but if required I can give you some properties of the pipe and structure.

Your help is greatly appreciated!

Regards,
Martin

RE: Torque problem

torque = moment = W x sin(angle)
W = weight of the structure
angle = angle of rotation reference from the vertical.

Ted

RE: Torque problem

Yeah,hydtools has a partial answer, however, there will be an angular deflection when rotating the shaft to upright the load,therefore, that torque to overcome that twisting motion has to be added or substracted if the shaft is under torsional strain.

RE: Torque problem

(OP)
Thanks Hydtools and Chicopee!

Chicopee, how do you calculate that part of the torsion as a result of the pipe twisting? I presume that it has a relation with the distance the location where the torque will be applied and location of the CoG and the geometry (cross section) of yhe pipe?

Many thanks in advance,
Martin

RE: Torque problem

My solution is complete for the question asked and information given.

Ted

RE: Torque problem

(OP)
Does this mean that the influence of a twisting pipe (and distance between structure and location where the torque can be applied) doesn't have an effect on the torque to be applied to uprighten the structure?

RE: Torque problem

torsional deflection has no effect on the moment (force x moment arm) required to spin the shaft and bring the structure upright, only on the work (force x distance) required.

RE: Torque problem

Correct. The length of pipe between the applied torque and the load will determine how much rotation the torque must go through to lift the load. That then is a dynamic problem in addition to the static problem.

Ted

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