TEP Studio

This repository contains a schema-driven Python implementation of the modified Tennessee Eastman Process in temexd_mod. Simulation code lives in src/tep_studio/simulation/; src/tep_studio/__init__.py re-exports the public API.

The Python package keeps the original temexd_mod.c equations as the numerical source of truth by compiling a native CFFI extension, then exposes process-aware Python contracts for:

• process-core use through TennesseeEastmanProcess
• Gymnasium RL/control interaction through GymTEPEnv
• causal trajectory datasets through TrajectoryDataset
• deterministic rollout and finite-difference optimization through OptimizationAdapter
• closed-loop decentralized control through ClosedLoopSimulation and RickerMultiLoopController
• an interactive Dash + Plotly interface for runs, disturbances, and dataset generation (tep_studio.ui)

Quickstart

pip install tep-studio            # add [ui] for the web Simulation Studio

import tep_studio as tep
tep.quickstart()                                  # short closed-loop smoke run

import gymnasium                                   # a registered RL environment
env = gymnasium.make("TennesseeEastman-v0", horizon=24.0)

from tep_studio import ClosedLoopSimulation     # the stabilized closed loop
result = ClosedLoopSimulation(horizon=24.0).run()

Or from the terminal: tep run --horizon 24 --idv idv_01@1.0, tep list disturbances, tep ui. See the Cookbook for task recipes.

Build

pip install tep-studio downloads the source distribution and compiles the native extension on your machine, so it needs a C compiler and the standard Python build tools (gcc or clang on Linux and macOS; the Visual Studio Build Tools on Windows). The instructions below cover building from a source checkout, which runs the same compile step.

The build requires setuptools>=68 (declared in pyproject.toml). The recommended path is an editable install, which uses build isolation to provision the correct build dependencies automatically:

python3 -m pip install -e .

If your environment blocks build isolation (for example, an offline machine), first ensure the build tools are current, then install without isolation:

python3 -m pip install -U "setuptools>=68" wheel cffi
python3 -m pip install -e . --no-build-isolation

To build the native extension in place instead of installing, the same setuptools>=68 requirement applies (older setuptools mis-places the compiled artifact under the src/ layout):

python3 -m pip install -U "setuptools>=68"
python3 setup.py build_ext --inplace

The compiled _tep_native extension is platform-specific and is not tracked in version control. After moving the repository to a new machine or operating system, rebuild it with one of the commands above before importing the package.

Smoke Test

PYTHONPATH=src python3 src/tep_studio/simulation/examples/r12_open_loop.py
PYTHONPATH=src python3 -m pytest -q

The R12 open-loop example should terminate near 1.07 h with a high reactor pressure shutdown.

Validation

PYTHONPATH=src python3 -m tep_studio.simulation.validation run --suite local
PYTHONPATH=src python3 -m tep_studio.simulation.validation run --suite steady_state
PYTHONPATH=src python3 -m tep_studio.simulation.validation run --suite mat_states
PYTHONPATH=src python3 -m tep_studio.simulation.validation run --suite all --solvers RK23 RK45
PYTHONPATH=src python3 -m tep_studio.simulation.validation figures
PYTHONPATH=src python3 -m tep_studio.simulation.validation report

Validation artifacts are written under src/tep_studio/simulation/validation_outputs/. The steady-state suite exports the Ricker (1995) Table 2/3 references, compares the simulator base case against the reported Downs and Vogel steady state, and marks optimized modes 1-6 as reference-only unless their electronic 50-state vectors are supplied. The MAT-state suite evaluates the bundled Simulink CSTATE vectors for Mode 1, Mode 3, and Skogestad Mode 1 and writes paper-ready comparison tables and figures. Add --download-external to cache public reference metadata and files where available.

Closed-Loop Control

The base-case plant is open-loop unstable and trips on high reactor pressure within a few hours. The tep_studio.control package adds the Ricker (1996) decentralized multiloop PI strategy, which stabilizes the plant for the full horizon:

PYTHONPATH=src python3 src/tep_studio/control/examples/ricker_mode1_closed_loop.py

from tep_studio.control import ClosedLoopSimulation

result = ClosedLoopSimulation(control_interval=0.0005, horizon=48.0).run()
assert result.stabilized  # ran the horizon without a shutdown

The controller is separate from the simulator core and consumes only published measurements (no plant-state leakage). It reproduces the loop pairings and gains from Ricker's runnable MultiLoop_mode1.mdl, initializes bumplessly from the Mode-1 state, and emits a reproducible experiment record. See docs/control.md for the loop structure, overrides, disturbance rejection, and configuration flags.

Interface (Simulation Studio)

An interactive Dash + Plotly web interface for running, visualizing, and exporting simulations. It covers open/closed-loop runs, disturbance scenarios, dataset generation, run comparison, and scenario save/load:

python3 -m pip install -e ".[ui]"
python3 -m tep_studio.ui          # or: tep-ui ; opens http://127.0.0.1:8050

The interface is a thin layer over a Dash-free, importable backend (from tep_studio.ui import run_scenario, ScenarioConfig, build_dataset), so the same runs and exports are scriptable. See docs/ui.md.

Online Documentation

The online documentation source is in docs/ and is configured by mkdocs.yml. It is written as a practical step-by-step guide for new users and is based on the simulator supplement:

python3 -m pip install -e ".[docs]"
python3 -m mkdocs serve
python3 -m mkdocs build --strict

(Append --no-build-isolation to the install command if your environment blocks build isolation, after upgrading the build tools as described under Build.)

The local server defaults to http://127.0.0.1:8000/. Start with docs/getting-started.md, then run the walkthrough in docs/first-simulation.md.