Axel Larsson

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Maybe there is some help or inspiration from a similar problem to be found here: JuliaRobotics/DistributedFactorGraphs.jl#554

@ChrisRackauckas This is how it looks like. I tried increasing / decreasing dts with LobattoIIIb stage 5, but to no avail. ![lobattoIIIa_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/4ac25e3b-7744-470c-860a-a5b678a8087f) ![lobattoIIIa_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/33bd7fc3-02f8-4c35-b58e-b3f202cbe757) ![lobattoIIIb_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/f3164abc-57b6-404e-a5b5-d2caa4792656) ![lobattoIIIb_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/715de135-a70a-4d68-86e7-4f9cd579d520) ![lobattoIIIc_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/092bb7d8-cfc2-41f2-9be4-c28a8991149c) ![lobattoIIIc_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/15f4b952-126f-49bf-b94e-89930aa22224) ![radau_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/17c4d2f7-8c95-4a40-8e70-1e28ce99dd48) ![radau_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/ca4dc9de-2998-40ab-a895-f717a879799c)

@ChrisRackauckas Oops, I wasn't aware of that one. Here are the highest order solvers plotted with `plot(sim)` ![lobattoIIIa_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/d4486dc8-6c72-439e-891d-dfebb74de0ae) ![lobattoIIIa_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/340528e1-542a-4ec7-bb21-4d167e6ccd0d) ![lobattoIIIb_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/0f6ef3d0-7670-4d5e-b0ba-7f1515f0eb96) ![lobattoIIIb_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/fa1bd8bb-ad4c-47bc-b36e-22ce3a9b3bf1) ![lobattoIIIc_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/9eeac340-cdd1-40b1-a5c7-9bc350e96b15) ![lobattoIIIc_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/c8b946a5-7cc1-4426-94fc-341edadc34b6) ![radau_p3](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/638aff35-eb15-4667-adeb-712dd5da0764) ![radau_p7](https://github.com/SciML/BoundaryValueDiffEq.jl/assets/65452706/d53348b7-9809-41df-8ca3-9880afa5603a)

@ChrisRackauckas I get an `ERROR: UndefRefError: access to undefined reference` when using `BigFloat` for these solvers, and also `MIRK`. It seems to come from the autodiff and the error is...

Thanks! Is it possible to define a time dependent loading or do you mean to repeatedly solve for equilibrium with increasing loads each time?

IIUC, the approach in the docs only works for meshes? I couldn't figure out how to do this for beams. What I want to achieve is: ```julia using GXBeam #...