tpt-engineering

Applied engineering primitives for the TPT Solutions physical-systems verticals.

Dual-licensed under MIT or Apache-2.0.

29 of 43 crates are published on crates.io at 0.1.0 (Batches 1-5, released 2026-08-15 — see RELEASE.md). The 14 newest domain crates (props-mixture, electrical, schedule, biomech, crystallography, geotech, heat-transfer, vehicle-dynamics, power-components, pcb, renewables, building-sys, thermal-mgmt, unit-ops) are not yet published — see PUBLISH_TRACKING.md. There is no v0.1.0 git tag yet. APIs are unstable until the first tagged release.

Scope

A set of small, single-purpose tpt-eng-* crates providing reusable engineering maths — fluid/gas properties, time-series conditioning, infrastructure topology, controls, structural/mechanical analysis, geometry/CAD primitives, and domain-specific component models — drawn out of the product verticals as foundation-pillar building blocks rather than product-shaped packages. The workspace has grown from the original 14-crate Phase-0 scope (see spec.txt) to 43 crates: structural/mechanical and geometry/CAD domains were added post-Phase-4, and a further 14 electronics/energy/transport/medical/process/earth/construction component-model crates were added per spec2.txt (Phase 9).

All crates are new implementations built from scratch (the spec's claimed consolidation source tpt-rust2 does not exist on this machine, and the external vertical repos were not available for audit from this build environment).

Release & publish status

29 of the 43 tpt-eng-* crates are published on crates.io at 0.1.0 (Batches 1–5, 2026-08-15); the remaining 14 newest domain crates are tracked for release in PUBLISH_TRACKING.md (Batches 6–8). The full batch plan lives in RELEASE.md.

Per-crate publish state is kept consistent with those tracking docs by cargo xtask publish-status (also run as part of cargo xtask check in CI), which asserts the README/CHANGELOG counts and the pending-crate set against Cargo.toml / RELEASE.md / PUBLISH_TRACKING.md.

Status	Crates	Source
Published (0.1.0)	29	RELEASE.md Batches 1–5
Pending (Batches 6–8)	14	PUBLISH_TRACKING.md

There is no v0.1.0 git tag yet. APIs are unstable until the first tagged release.

Crate inventory

Crate	Domain	no_std	Description
tpt-eng-props-water	fluid-properties	yes	IAPWS-IF97 water/steam property tables
tpt-eng-props-air	fluid-properties	yes	ASHRAE psychrometrics / moist-air
tpt-eng-props-fuels	fluid-properties	yes	Fuel heating values, density, combustion
tpt-eng-props	fluid-properties	yes	Umbrella: re-exports water + air + fuels
tpt-eng-timeseries-core	timeseries		Core time-series types
tpt-eng-timeseries-align	timeseries		Irregular multi-rate stream alignment
tpt-eng-timeseries-gap	timeseries		Staleness/gap detection + interpolation
tpt-eng-timeseries	timeseries		Umbrella: re-exports core + align + gap
tpt-eng-geo-asset	geo/topology		Geographic asset registry
tpt-eng-geo-topology	geo/topology		Directional infrastructure graphs
tpt-eng-network-matrix	geo/topology		Incidence/admittance matrix generation
tpt-eng-controls	controls		PID / state-space / transfer-function
tpt-eng-structural	structural/mechanical		Loads, beam/frame analysis, code checks
tpt-eng-materials	structural/mechanical		Material property library + data provenance
tpt-eng-sections	structural/mechanical		Cross-section properties (rect/circle/I-section)
tpt-eng-standards	structural/mechanical		Load cases, design factors, code-check results
tpt-eng-tolerance	structural/mechanical		1-D dimensional tolerance stack-up (worst-case/RSS/Monte-Carlo)
tpt-eng-gdt	structural/mechanical		GD&T data model (zones, datum frames, material modifiers)
tpt-eng-reliability	structural/mechanical		Fatigue, Weibull, FMEA
tpt-eng-safety	structural/mechanical		Limit-state margins / utilization ratios
tpt-eng-geometry	geometry/CAD		Points, vectors, frames
tpt-eng-nurbs	geometry/CAD		B-spline / NURBS curves and surfaces
tpt-eng-mesh	geometry/CAD		Triangle mesh data structure, quality/repair
tpt-eng-cad	geometry/CAD		SDF solid modeling / CSG
tpt-eng-io	geometry/CAD		STL/OBJ/JSON/CSV file I/O
tpt-eng-plot	output		Charts and section drawings (via plotters)
tpt-eng-report	output		Markdown/HTML/JSON calculation reports
tpt-eng-cli	integration		Command-line tool over the above
tpt-eng-examples	integration		Cross-crate scenarios composing multiple domains
tpt-eng-electrical	electrical	no	Impedance/reactance, per-unit systems, three-phase power
tpt-eng-heat-transfer	thermal	no	Convection/radiation correlations, conduction, thermal-resistance networks
tpt-eng-props-mixture	fluid-properties	yes	General real-gas / VLE property lookups for arbitrary mixtures
tpt-eng-pcb	electronics	no	PCB layer stackup, trace routing, via/footprint definitions
tpt-eng-thermal-mgmt	cross-domain	no	Heat sink sizing, fan curves, thermal-resistance networks
tpt-eng-power-components	energy	no	Transformer/generator models, transmission-line parameters
tpt-eng-renewables	energy	no	Solar PV, wind turbine, battery degradation models
tpt-eng-vehicle-dynamics	transport	no	Tire models, aero drag, suspension kinematics
tpt-eng-biomech	medical	no	Hyperelastic tissue models, implant geometry
tpt-eng-unit-ops	process	no	Distillation, heat exchangers, pump/compressor curves
tpt-eng-crystallography	materials	no	Miller indices, slip systems, symmetry operations
tpt-eng-geotech	earth	no	Soil constitutive models, borehole stratigraphy
tpt-eng-building-sys	construction	no	HVAC loads, plumbing fixture units, panel scheduling
tpt-eng-schedule	construction	no	CPM/PERT, resource leveling, Earned Value Management

Building

This workspace depends on the tpt-math substrate (tpt-math-units, tpt-math-numeric, tpt-math-linalg, tpt-math-stats), resolved as regular versioned dependencies from crates.io — no sibling checkout needed:

git clone https://github.com/tpt-solutions/tpt-engineering.git
cd tpt-engineering
cargo build --workspace
cargo test --workspace

• Edition: 2024.
• MSRV: 1.85 (rust-version in [workspace.package]). The toolchain version is additionally fixed by rust-toolchain.toml via rustup.

The tpt-eng-props-* family is no_std; it builds for bare-metal targets with the default features disabled.

Which crate do I need?

The inventory above is a flat list. For choosing a starting point by task:

If you need to…	Start with
Compute water/steam thermodynamic properties (IAPWS-IF97)	tpt-eng-props-water
Compute moist-air / psychrometric properties (ASHRAE)	tpt-eng-props-air
Compute fuel heating values, density, combustion properties	tpt-eng-props-fuels
Work with any/all fluid properties at once	tpt-eng-props (umbrella)
Condition/timestamp irregular sensor streams	tpt-eng-timeseries-core
Align multi-rate streams (e.g. 1 Hz CAN vs 10 s Modbus) onto one grid	tpt-eng-timeseries-align
Detect staleness/dropouts and interpolate gaps	tpt-eng-timeseries-gap
Use all time-series primitives together	tpt-eng-timeseries (umbrella)
Register geographic assets / devices	tpt-eng-geo-asset
Model pipes/wires/ducts as directed graphs	tpt-eng-geo-topology
Generate incidence/admittance matrices from topology	tpt-eng-network-matrix
Implement PID / state-space / transfer-function control	tpt-eng-controls
Compute loads, beam/frame analysis, code checks	tpt-eng-structural
Look up material properties (with data provenance)	tpt-eng-materials
Compute cross-section properties (rect/circle/I-section)	tpt-eng-sections
Apply code load cases / design factors / pass-fail checks	tpt-eng-standards
Roll up 1-D dimensional tolerance stack-ups (worst-case/RSS/Monte-Carlo)	tpt-eng-tolerance
Model GD&T zones, datum frames, material modifiers	tpt-eng-gdt
Compute fatigue life, Weibull reliability, run an FMEA	tpt-eng-reliability
Compute limit-state margins / utilization ratios	tpt-eng-safety
Work with points/vectors/frames in 2D/3D	tpt-eng-geometry
Build B-spline / NURBS curves and surfaces	tpt-eng-nurbs
Represent/repair/query a triangle mesh	tpt-eng-mesh
Build solids via SDF/CSG modeling	tpt-eng-cad
Read/write STL, OBJ, JSON, or CSV files	tpt-eng-io
Draw a chart or section diagram	tpt-eng-plot
Generate a calculation report (Markdown/HTML/JSON)	tpt-eng-report
Run any of the above from a command line, no Rust required	tpt-eng-cli
A full worked cross-crate scenario	tpt-eng-examples
Compute electrical impedance / per-unit / three-phase power	tpt-eng-electrical
Compute convection/radiation heat transfer and conduction	tpt-eng-heat-transfer
Look up general real-gas / VLE mixture properties	tpt-eng-props-mixture
Design a PCB stackup / trace / via	tpt-eng-pcb
Size a heat sink or solve a fan-curve operating point	tpt-eng-thermal-mgmt
Model transformers, generators, or transmission lines	tpt-eng-power-components
Model solar PV, wind turbines, or battery degradation	tpt-eng-renewables
Model tire forces, aero drag, or suspension kinematics	tpt-eng-vehicle-dynamics
Model hyperelastic tissue or implant geometry	tpt-eng-biomech
Size distillation columns / heat exchangers, pump curves	tpt-eng-unit-ops
Work with Miller indices, slip systems, crystal symmetry	tpt-eng-crystallography
Model soil behavior or borehole stratigraphy	tpt-eng-geotech
Compute HVAC loads, plumbing, or electrical panel schedules	tpt-eng-building-sys
Plan/schedule projects (CPM/PERT, Earned Value Management)	tpt-eng-schedule

Quickstart

Add the crates you need (they re-export tpt-math's uom-typed units):

cargo add tpt-eng-props tpt-eng-controls tpt-eng-structural

use tpt_eng_controls::{Pid, PidGains};

let mut pid = Pid::new(PidGains::new(2.0, 1.0, 0.0)).with_output_limit(1.0);
pid.set_setpoint(10.0);
let mut y = 0.0;
for _ in 0..1000 {
    let u = pid.update(y, 0.01);
    y += 0.01 * u; // first-order plant, τ = 1 s
}
assert!((y - 10.0).abs() < 0.5);

For a full, cross-crate worked example (topology → network matrix → controls → time-series conditioning → structural check), see tpt-eng-examples.

Developer tooling

cargo xtask provides one-stop hygiene and scaffolding (check, test, doctest, doc, no-std-matrix, new-crate). A root justfile mirrors these for non-Cargo users.

See CONTRIBUTING.md for the issues-only contribution policy and where to report problems.

License

Licensed under either of MIT or Apache-2.0 at your option.

Copyright (c) 2026 TPT Solutions.