2 Replies Latest reply on Mar 3, 2015 8:40 PM by Jared Conway

    can I simulate a rotating shaft with one of its ends fixed?

    Oscar Martinez


      Hi guys, I´m very new to SW Simulation. I´m trying to simulate a shaft which drives a some equipment @ 0.03 rpm and 1 HP. I fixed one of its ends and applied the corresponding torque on the other one. The shaft is supported by three bearings, which I simulated as fixed hinge restraints. I also loaded the shaft with a remote force and its own weight.

      Are my restraints ok?

      Does the remote force automatically transmit the moment or should I specify this on the "moment definition tab" in the remote load property manager?

       

      Besides that, the shaft drives four sprockets, where the torque its distributed. Should I know the reacting forces on this sprockets and load the model with them or just let the simulation compute the reactions on them?

       

      The first hinge reestraint on the left of the image represents a new bearing that I´m trying to add to the shaft. The thing is that I´m getting displacements in the Y direction of +- 17mm. Could you give me some advice on this? I really appreciate your help!!

        • Re: can I simulate a rotating shaft with one of its ends fixed?
          Pablo Jorge

          Hello Oscar,

           

          I'm not an expert but...

           

          1) I  would NOT fix the end

           

          2) I would simulate te bearings with bearing fixes. The first hinge fixing will support all the radial moment. Also will avoid any axial displacement.

           

          3) You have two moments: one rotational and one..." bending moment", I don't know how to say.

          When you speak about remote force, I suppose you are asking about the bending moment produced by the radial force.

          If I understand you question, yes, remote force do apply this moment.

           

          4) Yes, you should know the torque in each sprocket, in order to get a realistic result

           

          5) What you call Y direction? Axial direction?

           

          Too problems in one question. I would try to simplify the questions... specially if you expect to get answers

          • Re: can I simulate a rotating shaft with one of its ends fixed?
            Jared Conway

            are the restraints ok? > they are a good first shot, i would recommend writing down what you think the assumptions are relative to them and what influence you think they will have on the results. bearing fixtures  would be another option.

             

            remote force apply moment > don't know what you mean here. it is a force not a moment. it will apply a load.

             

            sprockets > it depends on the goal of your analysis. if your analysis goal is worst case where they are all locked up, you could apply a fixture where they are.

             

            17mm displacement > what are you expecting?

             

            what i'd recommend is starting off with a description of the application and the loading in the real world rather than a description of your setup. without the context, it can't be measured