02a675c152
Stand up reachability/ with a hand-rolled zonotope propagator for linear closed-loop systems (reach_linear.m: axis-aligned box hull, augmented-matrix integration for the disturbance convolution). Use it in reach_operation.m to discharge the operation-mode safety obligation: from a +/-0.1 K box on T_avg, under Q_sg in [85%, 100%]*P0, LQR keeps T_c within 0.03 K of setpoint over 600 s. Safety band is +/-5 K, so the obligation is satisfied with five orders of margin. barrier_lyapunov.m attempts the analytic counterpart via a weighted Lyapunov function. Sweeping the Qbar(T_c) weight, the best quadratic barrier allows ~33 K deviation on the gamma level set — still outside the 5 K safety band. This is a fundamental limitation of quadratic barriers for anisotropic safety specs (thin-slab safe set in a precursor-heavy state space). Documented in the file: next step for a tight analytic certificate is SOS polynomial or polytopic barrier, which need solvers we don't have locally yet. reach_linear.m started out with a halfwidth-propagation bug (signed A_step instead of |A_step|); fixed before commit after noticing the reach envelope exactly matched the initial box on T_c. Figures saved to docs/figures/. .mat result files gitignored — they are regenerated in <1s. Hacker-Split: first end-to-end per-mode reachability artifact. 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 (
plant-model/): 10-state point kinetic equation + thermal-hydraulics PWR model with bounded steam-generator heat removal as the disturbance input. - Research context (
thesis/): the HAHACS PhD proposal that motivates and formalizes the methodology.
Layout
pwr-hybrid-3-demo/
CLAUDE.md AI-facing context and architecture map
docs/
architecture.md How the discrete and continuous layers compose
figures/ Shared figures for thesis + talks
fret-pipeline/ FRET → ltlsynt → AIGER → state machine
plant-model/ PWR point kinetics + thermal-hydraulics
reachability/ Continuous-mode verification (TBD)
hardware/ Ovation HIL artifacts (TBD)
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 (MATLAB or GNU Octave in plant-model/):
main
Prerequisites
- Python 3.10+
- Spot for
ltlsynt(brew install spot) - Graphviz for
dot(brew install graphviz) - MATLAB or GNU Octave for the plant model
- LaTeX (via
latexmk) for the thesis submodule
Further reading
CLAUDE.md— orientation for AI agents working in this repodocs/architecture.md— how the layers composethesis/CLAUDE.md— the thesis project structurefret-pipeline/README.md— FRET naming conventions and pipeline detailsplant-model/README.md— scenario setup and model equations