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How can I simulate a rotating flexible link with hub?
Posted Oct 12, 2020, 10:13 AM EDT Mechanical, Acoustics & Vibrations, Results & Visualization, Structural Mechanics & Thermal Stresses Version 5.5 1 Reply
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I'm a student and I know comsol from a school workshop. I think it is very powerful but now I'm still studying it and cannot use it fluently. Now I want to use it to analyze a simple multibody problem and I want to use comsol to verify my method. But I met some problems which have not solved after my many attempts. The problem is briefly described below.
As shown in the figure, a flexible beam is rigidly fixed on the hub, and the hub is driven by the rotor. There is a rotational spring between the rotor and hub. Now I want to simulate the elastic deflection of the flexible link when it rotates. Thus, I think this is a simple rigid-flexible problem.
I use 2D beam and multi-body dynamic modules to simulate this problem. As I have no idea on how to simulate the hub, the hub and rotational spring are omitted in my attempt. I firstly define the beam and a connection attachment under beam module. Then I use point mass to simulate the payload. In multibody dynamics module, I use hinger joint to simulate the rotation in which the source and destination are respectively fixed and the attachment defined under beam module. I specify the torque on this joint to drive the flexible link.
I think this should be a very simple problem and COMSOL can solve it. But I faced some problems.
- I don't know how can I export the elastic deflection of the flexible link. As shown in the figure, I want to export the elastic deflection observed in rotating link but not stationary coordinate system.
- Is there some simple approach to simulate the hub and rotational spring?