danesabo/PWR-HYBRID-3
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
PWR-HYBRID-3/julia-port/README.md
Dane Sabo 9fc4afb611 julia-port: parallel plant model; sanity sim matches MATLAB, reach is stub 
Port pke_params, pke_th_rhs, pke_linearize, and all five controllers
to Julia. sim_sanity.jl reproduces the MATLAB main.m operation-mode
scenario (100%->80% Q_sg step) and matches final state to 3 decimals
across n, T_f, T_avg, T_cold, u.

reach_operation.jl is a stub: ReachabilityAnalysis.jl (LGG09, GLGM06,
BFFPSV18) numerically explodes on the raw stiff system — envelopes of
1e14 K to 1e37 K instead of the known-tight 0.03 K. Almost certainly
a state-scaling issue: precursors C_i ~ 1e5, temperatures ~ 300,
eigvals span 5000x. Diagonal scaling + retry is planned; left for the
next pass since the hand-rolled MATLAB reach already discharges the
operation-mode obligation.

Project.toml pins OrdinaryDiffEq >= 6.111 (the one that precompiled
cleanly on first instantiate). Manifest gitignored.

Hacker-Split: Julia path open, reach side needs a scaling pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-17 12:52:57 -04:00

1.4 KiB
Raw Blame History

Julia port

Parallel implementation of the plant model (../plant-model/) in Julia, intended as an eventual landing spot for reachability if we outgrow the MATLAB / hand-rolled tooling.

Status

  • src/pke_params.jl, src/pke_th_rhs.jl, src/pke_linearize.jl — functional, match MATLAB term-for-term.
  • controllers/controllers.jl — all five modes ported (null, shutdown, heatup, operation, scram). LQR factory included via MatrixEquations.jl.
  • scripts/sim_sanity.jl — closed-loop simulation matches MATLAB to 3 decimals on the 100% → 80% Q_sg step. ✅ passing.
  • scripts/reach_operation.jl — ❌ stub. ReachabilityAnalysis.jl algorithms blow up on this stiff, badly-conditioned system. See the file header for diagnosis and planned fix (state rescaling).

When to prefer Julia over MATLAB

Today: nowhere. The sanity path exists so we don't regret the eventual port.

Once the reach scaling is resolved:

  • Nonlinear reach for the P controller in operation mode (CORA / JuliaReach territory where MATLAB's linearization doesn't suffice).
  • Heatup reach with its time-varying reference.
  • Parametric studies where MATLAB license fees / CI friction matter.

Running

cd julia-port
julia --project=. -e 'using Pkg; Pkg.instantiate()'
julia --project=. scripts/sim_sanity.jl

First run will precompile the dependency stack (OrdinaryDiffEq, ReachabilityAnalysis, LazySets — a few minutes).