Friction problem

Take a look at this post; it might be helpful to you: http://bbs.hcbbs.com/thread-369779-1-2.html. Also, it’s not recommended to consider friction, as it can lead to errors!

Take a look at that thread on http://www.pipingsoft.com/bbs/thread-597-1-1.html – maybe it can provide some insights or solutions to your question At the request of the forum moderator for this section, and in accordance with the reposting requirements of the website at the address mentioned above, I have excerpted some content from thomas, the moderator of the Piping and Equipment Technology Forum. Especially the last paragraph; I hope it will be helpful to you: By increasing the friction stiffness in the CII configuration, the displacement here will decrease to varying degrees. This can lead to a redistribution of loads throughout the piping system, and it also hinders the resolution of convergence problems. If convergence problems occur on a braced structure with friction, reducing the friction stiffness will usually improve convergence. This post was last edited by llljq on 2009-2-15 15:21]

Reducing stiffness does indeed work, and I’d like to try seeing if changing +y to a y constraint will also work

From the perspective of numerical simulation, including a friction coefficient definitely yields greater accuracy than not including it. Especially when calculating the forces on the pipe outlet. From a software perspective, adding a friction coefficient hinders the convergence of calculations. My* habit is to enter the friction coefficient. When convergence does not occur, the solution is as follows: 1. The failure to converge at that point is due to a tendency for the support there to become void; therefore, the pipe rack should be adjusted according to the actual possibilities, as this represents the most realistic solution. 2 can appropriately reduce the stiffness of the pipe rack, but if the stiffness is too low, it may become unrealistic. 3 The least realistic solution: eliminate the friction coefficient at that point. Even if you take that into account, the pipeline remains unstable due to the tendency for voids at that point.

Changing the constraint from +y to y might simplify the calculations, but are pipe racks of this type actually used in practice? After all, such pipe racks are not very common. As a response to the person above, I believe that appropriately modifying the stiffness of the pipe racks is a viable solution; those who have switched from fields like piping or process engineering should be familiar with this concept； If it’s still not possible to calculate the past value, I think adjusting the position of the pipe rack would be a good option. If that still doesn’t work, then the method of eliminating the friction coefficient can be used. President Wang of CAESAR II also did not state definitively that eliminating the friction coefficient could cause excessive harm

1 This point does not converge because the support at that point shows a tendency to become void; therefore, the pipe rack should be adjusted according to the actual possibilities, as this is the most realistic solution. 3 The least realistic solution: eliminate the friction coefficient at that point. Even if you take that into account, the pipeline remains unstable due to the tendency for voids at that point. In my opinion, for the pipes on the pipeline tray, when they are in a detached state during operation, the friction coefficient can be disregarded, because there is no friction at all when they are detached. If it’s Fy…