7a1023e252
Second heatup PJ probe with tightened X_entry (T_c width 6K vs baseline 14K) gives: T=60s: 5710 sets in 101s — T_c envelope [281.05, 291.0] ✅ T=300s: 12932 sets in 206s — T_c envelope [281.05, 291.0] ✅ T_c envelope STABLE (identical at 60s and 300s) — the tube reached steady shape and stopped growing. Low-T_avg trip (280) cleared at lower bound 281.05, ~1K margin. **First sound nonlinear reach-avoid proof for any mode of this plant:** for the tightened entry and T = 300s, every inv1_holds halfspace holds along the tube. Sound w.r.t. PJ dynamics (<= 0.1% error vs full state). The baseline wider-entry run was loose on T_c low bound (272.4), confirming that the looseness was entry-box-width driven (14K too wide for TMJets + orderQ=2) rather than intrinsic to the method. Entry splitting / refinement is the path to the full baseline set. Also: LaTeX preamble now has the unicode-to-math literate map attached to the listing STYLES themselves (not just global \lstset), so terminal-output listings pasted from Julia with Δ, ≥, °, ✅ etc. render correctly. Journal 34 pages, clean build. OVERNIGHT_NOTES.md updated with tight-entry win. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
pwr-hybrid-3-demo
Preliminary example for the HAHACS thesis — a verified hybrid controller for a small modular PWR startup. Composes three layers into one demonstrable pipeline:
- Discrete layer (
fret-pipeline/): FRET natural-language requirements → LTL → synthesized AIGER controller → state-machine diagram. - Continuous layer (
code/): 10-state point kinetic equation + thermal-hydraulics PWR model with bounded steam-generator heat removal as the disturbance input. Controllers, linearization, LQR, reach-tube propagator, Lyapunov barrier — all Julia. - Verification artifacts (
reachability/): predicate concretizations (single source of truth inpredicates.json) and the standalone reach analysis writeup (WALKTHROUGH.md). - Research context (
thesis/): the HAHACS PhD proposal. - Lab journal (
journal/): chronological invention log in LaTeX. - Predicate explorer app (
app/): Pluto.jl notebook bridging FRET predicates and continuous-state halfspaces.
Layout
pwr-hybrid-3-demo/
CLAUDE.md AI-facing context and architecture map
docs/
architecture.md How the layers compose
figures/ Shared figures for thesis + talks
fret-pipeline/ FRET → ltlsynt → AIGER → state machine
code/ Plant model, controllers, reach (all Julia)
reachability/ predicates.json + WALKTHROUGH.md
app/ Pluto.jl predicate explorer
journal/ LaTeX lab notebook
hardware/ Ovation HIL artifacts (TBD)
claude_memory/ Short AI-context notes
thesis/ [submodule] PhD proposal
presentations/
2026DICE/ [submodule] DICE 2026 abstract
Quickstart
Clone with submodules:
git clone --recurse-submodules <url>
cd pwr-hybrid-3-demo
Run the controller synthesis pipeline:
cd fret-pipeline
python3 scripts/fret_to_synth.py pwr_hybrid_3.json specs/synthesis_config_v3.json
bash scripts/synthesize.sh specs/synthesis_config_v3.json circuits
python3 scripts/trace_aiger.py circuits/PWR_HYBRID_3_DRC.aag diagrams
dot -Tpng diagrams/PWR_HYBRID_3_DRC_states.dot -o diagrams/PWR_HYBRID_3_DRC_states.png
Run the plant model and reach analysis:
cd code
julia --project=. -e 'using Pkg; Pkg.instantiate()' # first time only
julia --project=. scripts/main_mode_sweep.jl # all 5 DRC modes
julia --project=. scripts/reach_operation.jl # operation-mode linear reach
julia --project=. scripts/barrier_lyapunov.jl # Lyapunov barrier
julia --project=. scripts/barrier_compare_OL_CL.jl # OL vs CL barrier
julia --project=. scripts/reach_heatup_nonlinear.jl # nonlinear heatup (10s cap)
Open the predicate explorer:
cd app
julia --project=. -e 'using Pluto; Pluto.run()'
# Browser opens; navigate to predicate_explorer.jl
Soundness note: the current reach tubes are over-approximations
of the LINEAR model, not sound over-approximations of the nonlinear
plant. See reachability/README.md and reachability/WALKTHROUGH.md.
Prerequisites
- Julia 1.10+ (via
juliaup). - Python 3.10+ (FRET pipeline only).
- Spot for
ltlsynt(brew install spot). - Graphviz for
dot(brew install graphviz). - LaTeX (via
latexmk) for the thesis + journal builds.
Further reading
CLAUDE.md— orientation for AI agents working in this repodocs/architecture.md— how the layers composecode/CLAUDE.md— code architecture, conventions, validity rangecode/README.md— usage and dependenciesreachability/README.md— reach scope, soundness statusreachability/WALKTHROUGH.md— standalone analysis writeupjournal/README.md— journal format conventionsjournal/journal.tex— the journal itself, dated entriesthesis/CLAUDE.md— the thesis project structurefret-pipeline/README.md— FRET naming conventions and pipeline details