{"id":52449,"date":"2021-02-21T01:05:09","date_gmt":"2021-02-21T01:05:09","guid":{"rendered":"\/forum\/forums\/topic\/how-to-model-pulley-systems-and-bollards-with-ropes-under-friction\/"},"modified":"2021-02-21T01:05:09","modified_gmt":"2021-02-21T01:05:09","slug":"how-to-model-pulley-systems-and-bollards-with-ropes-under-friction","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-model-pulley-systems-and-bollards-with-ropes-under-friction\/","title":{"rendered":"How to model pulley systems and bollards with ropes under friction"},"content":{"rendered":"
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Hello people, <\/p>\n

I'm new to Ansys or CAE in general and I decided to model a pulley or bollard system with ropes and friction. First I wanted to create a bollard model with a rope and check the results manually with the Euler-Eytelwein formula. <\/p>\n

I faced a few problems. First I tried to model the rope as "cable" or "link" in Ansys by extracting it as a beam in SpaceClaim and changing it while PreProcessing to "cable" or link". This failed because Ansys didn't detect connections\/contacts between the bollard and the rope. <\/p>\n

Then I modelled the rope in SpaceClaim as "Solid". The connection was detected and I can choose the friction etc. However, the results with the solid are not satisfactory at all. Is there any way to model friction\/contact with links or cables, mabye changing the solid afterwards? Or did I do things wrong with my solid modelling?<\/p>\n

Explanations for the boundary conditions: <\/p>\n

Displacement 2 : Top right face of the solid is held in every direction<\/p>\n

Displacement: Shell surface of the lower left part is held in x,y directions in order to keep it straight<\/p>\n

Fixed Support: The inner surface of the bollard\/pulley is held<\/p>\n

Force: Force acts downwards on the left side surface area of the "rope"<\/p>\n

My problem here is actually that the fixed support in the bollard is bearing most of the load and not the reaction force in the rope, which is due to the "solid" behavior. <\/p>\n

I'm sorry for the long question and hope that you can help me. <\/p>\n

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\n\"bollard.PNG\"
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